Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:29Z No. of bitstreams: 1 KeylaThayrinneOliveiraCoimbra_DISSERT.pdf: 21184106 bytes, checksum: cd5ec307de2601ec684062fb512f9165 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-29T00:13:31Z (GMT) No. of bitstreams: 1 KeylaThayrinneOliveiraCoimbra_DISSERT.pdf: 21184106 bytes, checksum: cd5ec307de2601ec684062fb512f9165 (MD5) / Made available in DSpace on 2016-07-29T00:13:31Z (GMT). No. of bitstreams: 1 KeylaThayrinneOliveiraCoimbra_DISSERT.pdf: 21184106 bytes, checksum: cd5ec307de2601ec684062fb512f9165 (MD5) Previous issue date: 2015-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O plut?o Bom Jardim de Goi?s (PBJG) ? um corpo de geometria semi-circular, situado na por??o central da Prov?ncia Tocantins, intrusivo em ortognaisses e metassupracrustais do Arco Magm?tico Aren?polis. Estas metasupracrustais apresentam um bandamento / xistosidade de ?ngulo baixo a moderado, definido por micas, andalusita, silimanita e cordierita, caracterizando um metamorfismo na f?cies anfibolito. Tal estrutura ? truncada pela coloca??o das rochas do PBJG. O car?ter abrupto dos contatos e a aus?ncia de estruturas d?cteis demonstram que a intrus?o se deu em crosta relativamente fria. Em termos petrogr?ficos, o plut?o comp?e-se de monzodioritos, tonalitos e granodioritos, seguindo a trajet?ria evolutiva c?lcio-alcalina de pot?ssio baixo a intermedi?rio. As rochas do PBJG possuem hornblenda e biotita como fases m?ficas principais, al?m da ocorr?ncia subordinada de clinopirox?nio, titanita, ep?doto e opacos. Diques tardios de leucogranito cont?m apenas biotita como mineral acess?rio relevante. Uma data??o U-Pb em zirc?o do monzodiorito forneceu uma idade de 550?12 Ma (MSWD = 1,06). Dados litogeoqu?micos e de qu?mica mineral sugerem que as rochas em foco s?o c?lcio-alcalinas, tendo evolu?do por cristaliza??o fracionada de minerais c?lcicos e ferro-magnesianos, sob condi??es de alta fugacidade de oxig?nio. Utilizando o geoterm?metro do par anfib?lio-plagiocl?sio e o geobar?metro de Al em anfib?lio, foram determinadas temperaturas e press?es em torno de 692-791 ?C e 2,4 e 5,0 kbar para a intrus?o do PBJG, o que ? corroborado por associa??es metam?rficas pr?-existentes nas encaixantes. As caracter?sticas geol?gicas, geoqu?micas e a geocronologia do PBJG demonstram sua natureza p?s-tect?nica ou p?s-colisional, com coloca??o em crosta j? soerguida e relativamente fria, ao final da orog?nese brasiliana nesta por??o da Prov?ncia Tocantins. / The Bom Jardim de Goi?s Pluton (PBJG) is a semi-circular body, located in the central portion of the Tocantins Province, intrusive into orthogneisses and metassupracrustals of the Aren?polis Magmatic Arc. These metasupracrustals present a low to moderate dipping banding or schistosity, have a low to moderate angle of banding / foliation, defined by mica, andalusite and sillimanite and cordierite, which characterize an amphibolite facies metamorphism. This structure is crosscut by the emplacement of the PBJG rocks. The abrupt nature of the contacts and the absence of ductile structures indicate that the intrusion took place in a relatively cold crust. Under petrographic grounds, the pluton consists mainly of monzodiorites, tonalite and granodiorite, following the low to medium-K calk-alkaline alkaline trend. Rocks of the PBJG have hornblende and biotite as the main mafic phases, besides subordinate clinopyroxene, titanite, epidote and opaque. Late dikes of leucogranite contain only mineral biotite as relevant accessory mineral. One U-Pb zircon dating of a monzodiorite yielded an age of 550 ? 12 Ma (MSWD = 1.06). Whole-rock and mineral chemistry suggest that the studied rocks are calc-alkaline, having evolved by fractional crystallization of Ca- and Fe-Mg minerals under high oxygen fugacity. Using the amphibole-plagioclase geothermometer and the Al-in amphibole geobarometer, we calculate temperatures and pressures of, respectively, 692-791 ?C e 2.4-5.0 kbar for the intrusion of the PBJG, which is corroborated by previous metamorphic assemblages in the country rocks. The geological, geochemical and geochronological features of PBJG demonstrate their post-tectonic or post-collisional nature, with emplacement into an already uplifted and relatively cool crust at the end of brasiliano orogeny in this portion of the Tocantins Province.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:29Z No. of bitstreams: 1 NadjaCruzFerraz_DISSERT.pdf: 13420036 bytes, checksum: 48407aa7c5a58850e36ef79776b6b80c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-29T20:32:49Z (GMT) No. of bitstreams: 1 NadjaCruzFerraz_DISSERT.pdf: 13420036 bytes, checksum: 48407aa7c5a58850e36ef79776b6b80c (MD5) / Made available in DSpace on 2016-07-29T20:32:49Z (GMT). No. of bitstreams: 1 NadjaCruzFerraz_DISSERT.pdf: 13420036 bytes, checksum: 48407aa7c5a58850e36ef79776b6b80c (MD5) Previous issue date: 2015-08-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A Sequ?ncia Mesodevoniana-Eocarbon?fera da Bacia do Parna?ba, litoestratigraficamente definida como Grupo Canind?, foi reinterpretada empregando-se o modelo b?sico da estratigrafia de sequ?ncias. Para tanto, foram analisados perfis litol?gicos e de raios gama de po?os e linhas s?smicas da regi?o central da bacia, elaborando-se a partir da? diagramas 1D, mapas de is?coras e uma se??o estratigr?fica. Como resultados deste trabalho, foram definidos dois ciclos deposicionais de segunda ordem, referidos como Sequ?ncia Deposicional 1 (SEQ1) e Sequ?ncia Deposicional 2 (SEQ2). A SEQ1, com cerca de 37 Ma, ? limitada abaixo pela Discord?ncia Eodevoniana e equivale ?s forma??es Itaim, Pimenteiras e Cabe?as. A SEQ1 se inicia com o Trato de Sistemas de N?vel Baixo, constitu?do por conjuntos de parassequ?ncias progradacionais em que a parte basal, predominantemente pel?tica, depositou-se em um contexto de prodelta sob influ?ncia de tempestades e a superior ? composta por arenitos de frente deltaica, tendo como limite superior a superf?cie regressiva m?xima. O Trato de Sistemas Transgressivo, depositado acima, ? caracterizado por conjuntos de parassequ?ncias retrogradacionais, compostos predominantemente por pelitos de plataforma rasa, depositados sob a??o de tempestades. A superf?cie transgressiva m?xima, limite superior deste trato, ? posicionada em um n?vel de folhelho cuja radiatividade no perfil de raios gama ? pr?xima a 150 API. O Trato de Sistemas de N?vel Alto apresenta conjuntos de parassequ?ncias progradacionais, compostos por pelitos e arenitos depositados em ambientes plataformal, fl?vio-estuarino e periglacial, tendo como limite superior a Discord?ncia Neodevoniana. A SEQ2, que se segue, compreende um intervalo de cerca de 15 Ma e equivale ? Forma??o Long?. A mesma foi depositada em ambiente plataformal, iniciando com o Trato de Sistemas de N?vel Baixo, caracterizado por um conjunto de parassequ?ncias progradacional, seguido do Trato de Sistemas Transgressivo, de car?ter retrogradacional. O limite superior deste trato corresponde ? superf?cie transgressiva m?xima ou ainda, a fus?o desta superf?cie com o limite de sequ?ncia, que constitui a Discord?ncia Eocarbon?fera, onde a se??o sobreposta foi erodida. Tal se??o, que corresponde ao Trato de Sistemas de N?vel Alto, ? restrita ?s por??es em que a eros?o que originou a Discord?ncia Eocarbon?fera foi menos efetiva, preservando os registros desta unidade. / The Middle Devonian-Early Carboniferous sequence of the Parna?ba Basin, lithostratigraphically defined as Canind? Group, has been reinterpreted using the basic model of sequence stratigraphy. Therefore, lithology and gamma ray well-logs and seismic lines of central portion of the basin were analyzed, producing up from there diagrams 1D, isochore maps and stratigraphic sections. As results of this study, were defined two depositional cycles of second order, referred as Depositional Sequence 1 (SEQ1) and the Depositional Sequence 2 (SEQ2). The SEQ1, with interval about 37 Ma, is limited below by Early Devonian Unconformity and is equivalent to the formations Itaim, Pimenteiras and Cabe?as. The SEQ2, which follows, comprises a range of about 15 Ma and is equivalent to the Long? Formation The SEQ1 starts with the lowstand systems tract, consisting of progradational parasequence set in the basal part, predominantly pelitic, deposited on a prodelta under influence of storms and the upper part consists in sandstones of deltaic front, with the maximum regressive surface on the upper limit. The transgressive systems tract, deposited above, is characterized by retrogradacional parasequence set composed of shallow shelf mudstones, deposited under storm conditions. The maximum flooding surface, upper limit of this tract, is positioned in a shale level whose radioactivity in gammaray well-log is close to 150 API. The highstand systems tract presents progradational parasequence set, comprising mudstones and sandstones deposited in shelf, fluvial-estuarine or deltaic and periglacial environments, with the upper limit the Late Devonian Unconformity. The SEQ2 was deposited in shelf environment, starting with the lowstand systems tract, that is characterized by a progradational parasequence set, followed by the transgressive systems tract, with retrogradational character. The upper limit of the tract corresponding to the fusion between maximum flooding surface with the upper limit of this sequence, which is the Early Carboniferous Unconformity, where the overlapping section was eroded. This section, which corresponds the highstand systems tract is restricted to portions at which the erosion that generate the Early-Carboniferous Unconformity was less effective, preserving the records of this unit.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:25Z No. of bitstreams: 1 RafaelaDaSilvaAlves_DISSERT.pdf: 19927301 bytes, checksum: 8c1484fa0f5034747a0216799c271cc8 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-01T18:59:08Z (GMT) No. of bitstreams: 1 RafaelaDaSilvaAlves_DISSERT.pdf: 19927301 bytes, checksum: 8c1484fa0f5034747a0216799c271cc8 (MD5) / Made available in DSpace on 2016-08-01T18:59:08Z (GMT). No. of bitstreams: 1 RafaelaDaSilvaAlves_DISSERT.pdf: 19927301 bytes, checksum: 8c1484fa0f5034747a0216799c271cc8 (MD5) Previous issue date: 2015-08-21 / A ?rea de estudo est? inserida na Bacia Hidrogr?fica do Rio Pirangi, litoral Oriental do Estado do Rio Grande do Norte, onde est? situada a cidade de Parnamirim. Abrange uma superf?cie de 370 Km?. A expans?o urbana do munic?pio de Parnamirim tem se desenvolvido de forma muito acelerada sem uma estrutura adequada, notadamente pela aus?ncia de rede esgotos, com riscos de contamina??o das ?guas subterr?neas podendo causar s?rios danos ? sa?de p?blica. As ?guas subterr?neas do Sistema Aqu?fero Barreiras na ?rea de interesse constituem a principal fonte de suprimento h?drico das popula??es urbanas e rurais. O uso da ?gua subterr?nea ? feito sem planejamento adequado e assim, importantes ?reas de recarga est?o sendo ocupadas. O presente estudo foi desenvolvido para a quantifica??o do uso e avalia??o das potencialidades das ?guas subterr?neas, tendo em vista o aumento da oferta de ?gua de boa qualidade e com menores riscos de serem afetadas por atividades contaminantes. Com estes objetivos, foram desenvolvidas as seguintes atividades: cadastro de 268 pontos d??gua; caracteriza??o da litologia, espessuras e estrutura hidrogeol?gica do aqu?fero Barreiras, com base na correla??o de perfis de po?os; e, avalia??o de par?metros hidrodin?micos do aqu?fero, a partir da interpreta??o de resultados de testes de bombeamento de po?os. Verificou-se que a espessura saturada cresce de oeste para leste em dire??o ao mar, com valores que variam de 15,47 a 56,5 m, com m?dia de 32,45 m. Os par?metros hidrodin?micos, obtidos com aplica??o do m?todo de Cooper-Jacob foram: transmissividade m?dia de 5,9x10-3 m?/s e a condutividade hidr?ulica m?dia de 2,82x10-4 m/s. A porosidade espec?fica ? de 15%, obtida com aplica??o da equa??o Biecinski. O mapa potenciom?trico mostra a dire??o principal do fluxo subterr?neo, de oeste para leste, e permite identificar as zonas de recarga correspondentes a regi?o dos tabuleiros do ?Barreiras?. Os vales dos rios referem-se ?s zonas de descarga do sistema aqu?fero. A Recarga foi estimada em 253 mm/ano, que corresponde ? taxa de infiltra??o de 16,4%. / The study area is within the Pirangi River Basin, eastern sector of Rio Grande do Norte state, where is located of the Parnamirim city. It has an area of approximately 370 km?. Urbanization has developed much fast without an appropriate infrastructure, mainly by the lack of sewage systems, with risks of contamination of groundwater that may cause serious damage to the health of the population. The Barreiras Aquifer System groundwater in the area represents the main source of water supply for urban and rural populations. The use of groundwater occurs without adequate planning and therefore, important recharge areas are being occupied. This study was conducted to quantify the use and evaluation of the potential of groundwater, in order to increase good water quality supply and lower risks of being affected by polluting activities. With these objectives, the following activities were carried out: 268 points of water have been registered; characterization of the lithological, thickness and hydrogeological structure of the Barreiras aquifer, based on the correlation of well logs; and evaluation of hydrodynamic parameters of the aquifer, from the interpretation of results well pumping tests. It was found that the saturated thickness increases from west to east towards the sea, with values ranging from 15,47-56,5 m with an average of 32,45 m. The hydrodynamic parameters using Cooper-Jacob method were: average transmissivity of 5,9x10-3 m?/s and average hydraulic conductivity 2,82x10-4 m/s. The effective porosity is of 15%, obtained by applying Biecinski equation. The potentiometric map shows the main direction of groundwater flow, from west to east, and identifies the recharge areas corresponding to the region of the tablelands of the "Barreiras". The river valleys refer to the discharge areas of the aquifer system. The Recharge was estimated at 253 mm/year, which corresponds to the 16.4% rate of infiltration.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:26Z No. of bitstreams: 1 RozileideDeOliveiraLima_DISSERT.pdf: 8444263 bytes, checksum: 33ebc04b3cf0c3eb61a258063678b930 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-01T19:55:22Z (GMT) No. of bitstreams: 1 RozileideDeOliveiraLima_DISSERT.pdf: 8444263 bytes, checksum: 33ebc04b3cf0c3eb61a258063678b930 (MD5) / Made available in DSpace on 2016-08-01T19:55:22Z (GMT). No. of bitstreams: 1 RozileideDeOliveiraLima_DISSERT.pdf: 8444263 bytes, checksum: 33ebc04b3cf0c3eb61a258063678b930 (MD5) Previous issue date: 2015-04-09 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Este estudo foi realizado na plataforma interna equatorial brasileira adjacente ao Rio Grande do Norte, entre a regi?o de Porto do Mangue e Galinhos, tendo como principal objetivo a caracteriza??o dos sedimentos biog?nicos, especialmente os foramin?feros e ostracodes coletados na superf?cie do fundo marinho. A metodologia utilizada envolveu procedimentos padr?es de levantamentos bibliogr?ficos, processamento de amostras em laborat?rio e identifica??o, em lupa binocular e microscopia eletr?nica de varredura (MEV) dos foramin?feros e ostracodes segundo g?nero ou esp?cie. An?lises estat?sticas multivariadas e estudo dos ?ndices ecol?gicos foram aplicados no estudo de foramin?feros. Com o objetivo de um melhor entendimento e interpreta??o dos resultados a ?rea foi dividida em tr?s perfis perpendiculares a linha e costa, desde a plataforma interna at? o talude: o perfil 01 (a leste, pr?ximo a Galos), o perfil 02 (centro, pr?ximo ? cidade de Macau) e o perfil 03 (a oeste, pr?ximo a Ponta do Mel). As condi??es ambientais influenciam diretamente no desenvolvimento dos organismos. Na regi?o de estudo observa-se uma homogeneidade relativa para as distribui??es horizontais de temperatura, verificando-se para a superf?cie (m?nima de 24? C, e m?ximas de 29?C a 35?C) e para a regi?o localizada nas proximidades do fundo (m?nima de 5,2 ?C, e m?xima de 28,8 ?C). Os resultados indicaram o predominio dos g?neros de foramin?feros bent?nicos com pouca ocorr?ncia planct?nica. Os g?neros bent?nicos observados em maior abund?ncia foram Quinqueloculina, Textularia , Globigerina e Pyrgo, respectivamente; Quinqueloculina, Textularia, Pyrgo, Ammonia, Elphidium, Pseudononion, Peneroplis, Bolivina e Poroeponides, respectivamente, ocorreram com maior frequ?ncia. Com menor frequ?ncia foram descritos Amphistegina, Arcaias, Bigenerina, Cibicides, Cassidulina, Amphicorina, Cornuspira, Paterina, Hopkunsina, Oolina, Uvigerina, Fusenkoina, Nonionella, Amphisorus, Wiesrella, Reussella, Reophax, Nodosaria, Marginulina e Cyclogyra. Tamb?m foram Entre os Foram identificados seis g?neros de ostracodes: Puriana variabilis/P. convoluta ?, Loxoconcha sp, Bairdiidae, Xestoleberis sp, Hemicytheridae e Ruggiericythere sp. Os grupos de organismos encontrados na plataforma atual apresentaram composi??o qu?mica principal de Ca, C, O, Na, Cl, Al, Mg e Si. A propor??o destes elementos qu?micos pode variar de acordo com o tipo de sedimento biog?nico, sendo as maiores quantidades identificadas de Ca, C, Cl, Na e O. A data??o absoluta pelo m?todo carbono 14 indicou que as gera??es de sedimentos de colora??es diferentes (claras e escuras), correspondem a uma ?nica idade, entre 3 e 6 mil anos AP, relacionados ao Quatern?rio. Estes dados ir?o complementar informa??es a respeito dos sedimentos biog?nicos existentes atualmente na plataforma continental brasileira, especialmente na regi?o nordeste, onde h? car?ncia de estudos nesta linha de pesquisa. / This study was conducted in the adjacent Brazilian equatorial inner shelf to Rio Grande do Norte, between the region of Porto do Mangue and Galinhos. The main objective is the characterization of biogenic sediments, especially foraminifera and ostracod collected on the surface of the seafloor. The methodology involved standard procedures including literature, surveys, processing of samples in the laboratory and identification of foraminifera and ostracods by genera or species under stereo microscopy and scanning electron microscopy (SEM). Multivariate statistical analyzes and study of ecological indexes were also applied to the study of foraminifera. Three transects, from inner shelf to slope were sampled: profile 01 (east, near Galos), profile 02 (center, near the city of Macau) and profile 03 (west, near Ponta do Mel). Results indicated the predominance of benthic foraminifera and little plankton occurrence. Benthic foraminifera genera observed in abundance were Quinqueloculina, Textularia, Globigerina and Pyrgo, Quinqueloculina, Textularia, Pyrgo, Ammonia, Elphidium, Pseudononion, Peneroplis, Bolivina and Poroeponides, occurred more frequently. Less frequently been described Amphistegina, Archaias, Bigenerina, Cibicides, Cassidulina, Amphicorina, Cornuspira, Paterina, Hopkunsina, Oolina, Uvigerina, Fusenkoina, Nonionella, Amphisorus, Wiesrella, Reussella, Reophax, Nodosaria, Marginulina and Cyclogyra. Six genera of ostracods were also identified: Puriana variabilis / P. convoluted?, Loxoconcha sp, Bairdiidae, Xestoleberis sp, Hemicytheridae and Ruggiericythere sp. Groups of organisms found in the studied shelf presented chemical composition of Ca, C, O, Na, Cl, Al, Mg, and Si. The proportions of chemical elements may vary according to the type of biogenic sediment, with the highest values identified as Ca, C, Cl, Na and O. The absolute dating by carbon 14 method indicated sediments of different colors (light and dark), correspond to a single age from 3000 to 6000 years BP, related to the Quaternary. These data intend to complement information about biogenic sediments in the Brazilian continental shelf, especially in the Northeast, where there is a lack of such studies.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:26Z No. of bitstreams: 1 SilviaAmorimTerra_DISSERT.pdf: 8312476 bytes, checksum: 1f02e20db0fedd2c8dc5413db2f0b262 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-01T20:19:56Z (GMT) No. of bitstreams: 1 SilviaAmorimTerra_DISSERT.pdf: 8312476 bytes, checksum: 1f02e20db0fedd2c8dc5413db2f0b262 (MD5) / Made available in DSpace on 2016-08-01T20:19:56Z (GMT). No. of bitstreams: 1 SilviaAmorimTerra_DISSERT.pdf: 8312476 bytes, checksum: 1f02e20db0fedd2c8dc5413db2f0b262 (MD5) Previous issue date: 2015-03-27 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O presente trabalho objetiva a caracteriza??o de rochas carbon?ticas da Forma??o Janda?ra, termalmente afetadas no contato com intrus?es b?sicas do Pale?geno e Ne?geno, na regi?o dos munic?pios de Pedro Avelino e Janda?ra (RN), nordeste do Brasil. Para o estudo em tela, foram utilizados dados de campo, microsc?picos, difra??o de raios-X, microssonda eletr?nica e litogeoqu?mica de rocha total. Os calc?rios n?o afetados termalmente s?o wackstones, grainstones e packstones. Podem constituir fragmentos de foramin?fero bent?nico, espinhos de equinoderma, ostracode, algas, bivalve, gastr?pode, pel?ides e intraclastos. A porosidade encontrada se enquadra nos tipos vugular, intrapart?cula, interpart?cula, intercristalina e m?ldica. Como minerais essenciais, tem-se calcita, anquerita e dolomita; como fases detr?ticas, citam-se montmorilonita, pirita, limonita, quartzo e microclina. Os calc?rios termalmente afetados apresentam granula??o muito grossa a muito fina e colora??o cinza clara a escura. Os componentes fossil?feros desaparecem totalmente, e a porosidade tende a desaparecer. Com os dados obtidos, infere-se que os prot?litos carbon?ticos seriam calc?rios calc?feros a dolom?ticos, ambos com pequena quantidade de minerais do grupo das argilas. Os calc?rios cristalinos de prot?lito dolom?tico cont?m calcita rombo?drica e bastante sulfeto e ?xido / hidr?xido de ferro, tornando as rochas bem mais escuras. Os carbonatos de prot?lito calc?tico mostram grande varia??o de granula??o em fun??o do grau de recristaliza??o, que aumenta na dire??o do contato com os corpos b?sicos. Neste grupo, foram identificados os minerais pirometam?rficos lizardita e espin?lio nas amostras pouco e moderadamente afetadas, e espin?lio e espurrita nas fortemente afetadas, al?m da calcita que ocorre em todos os casos. O contexto geol?gico (intrus?es rasas de diab?sios), a presen?a dos minerais pirometam?rficos espurrita e olivina (pseudomorfisada para lizardita, serpentina, brucita), e compara??o com diagramas da literatura permitem estimar temperaturas e press?es em torno de 1050-1200?C e 0,5-1,0 kbar, respectivamente, para PTOTAL=PCO2. O resfriamento p?s-intrus?o teria propiciado a remobiliza??o de por??es de mat?ria org?nica do sedimento original e libera??o de fluidos metassom?ticos / hidrotermais, ensejando a abertura do sistema metam?rfico, com eventual contribui??o de elementos qu?micos das unidades hospedeiras (arenitos, folhelhos) e das pr?prias intrus?es b?sicas. Isto favoreceria a hidrata??o de fases pr?vias, resultando em forma??o de serpentina, clorita e brucita. Os resultados mostram a forte influ?ncia do calor aportado por intrus?es b?sicas no pacote sedimentar. Considerando que na por??o offshore da bacia ocorrem soleiras com espessura de at? 1000 m, o entendimento do pirometamorfismo poder? ser de grande utilidade na compreens?o e dimensionamento desses dep?sitos. / The present study aims the characterization of thermally affected carbonate rocks from Janda?ra Formation in contact with Paleogene and Neogene basic intrusions in the region of the Pedro Avelino and Janda?ra municipalities (RN), northeastern Brazil. For this study, field, petrographic, x-ray diffraction, electron microprobe, and whole rock litogeochemistry data of carbonates were undertaken. The thermally unaffected limestones are classified like wackstones, grainstones and packstones. They may constitute carbonates grains of benthic foraminifera, echinoderm spines, ostracods, algae, corals, bivalves, gastropods, peloids and intraclasts. The porosities are classified like vug, intraparticle, interparticle, intercrystal and moldic types. The major minerals are calcite, ankerite and dolomite; the detrital are montmorillonite, pyrite, limonite, quartz and microcline. The thermally affected limestones are very coarse to very fine-grained and light to dark gray color. The fossiliferous components totally disappear, and the porosity tends to disappear. With the data obtained, it can be inferred that the carbonate protoliths would be calciferous to dolomitic limestones, both with small amount of clay minerals. Crystalline carbonates from dolomitic protolith have rhombohedral calcite and iron oxides / hydroxides, making the rocks much darker. The carbonates from calciferous protolith have a wide variation of grain size according to the recrystallization degree, increasing toward contact with the basic bodies. In this group, it was identified the minerals lizardite and spinel in weakly to moderately affected samples, and spinel and spurrite in strongly affected rocks, as well as calcite, that occur everywhere. The geological context (shallow level diabase intrusions), the crystallization of the pyrometamorphic minerals spurrite and olivine, and comparison with diagrams from the literature allow estimating temperatures and pressures around 1050-1200 ?C and 0.5-1.0 kbar, respectively, for PTOTAL=PCO2. The post-intrusion cooling would have afforded the releasing of metasomatic / hydrothermal fluids, allowing the opening of the metamorphic system, with possible contribution of chemical elements from host units (sandstones, shales) and from basic intrusions. This would induce hydration of previous phases, allowing the formation of serpentine, chlorite and brucite. The results discussed here reveal the strong influence of the heat from basic intrusions within the sedimentary pile. Whereas in the offshore portion of the basin occur sills with up to 1000 m thickness, the understanding of pyrometamorphism might be useful for understanding and measuring the thermally affected rocks.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:27Z No. of bitstreams: 1 ThuanyPatriciaCostaDeLima_DISSERT.pdf: 12184992 bytes, checksum: 65b052eef0c8113f7e14df3c3a40604b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-01T20:48:43Z (GMT) No. of bitstreams: 1 ThuanyPatriciaCostaDeLima_DISSERT.pdf: 12184992 bytes, checksum: 65b052eef0c8113f7e14df3c3a40604b (MD5) / Made available in DSpace on 2016-08-01T20:48:43Z (GMT). No. of bitstreams: 1 ThuanyPatriciaCostaDeLima_DISSERT.pdf: 12184992 bytes, checksum: 65b052eef0c8113f7e14df3c3a40604b (MD5) Previous issue date: 2015-09-25 / Ag?ncia Nacional do Petr?leo - ANP / O objetivo deste estudo foi caracterizar a express?o estrutural-geof?sica do Lineamento Transbrasiliano na por??o centro-leste da Bacia do Parna?ba. O Lineamento Transbrasiliano (LTB) corresponde a uma megazona de cisalhamento de idade neoproterozoica (Ciclo Brasiliano), com dire??o NE-SW e cinem?tica transcorrente dextral, ocorrendo subjacente (e exposta lateralmente nas bordas NE e SW) ? se??o sedimentar da Bacia do Parna?ba. No presente trabalho, a interpreta??o dos mapas de anomalias gravim?trica e magn?tica ? analisada face a essa cinem?tica do LTB, sendo que a assinatura das anomalias geof?sicas corresponde ?s etapas de evolu??o brasiliana a tardi-brasiliana, de temperatura alta e declinante. Verifica-se que o padr?o das anomalias gravim?tricas residuais ? compat?vel com um par S-C dextral, moldando os corpos geol?gicos do embasamento heterog?neo. As bandas C, com dire??o NE, devem ser constitu?das por fatias de gnaisses e granulitos (anomalias positivas), rochas gran?ticas ou metassedimentares de baixo grau e grabens pr?-silurianos em estilo pull-apart (anomalias negativas). J? as anomalias de tra?os curvil?neos no mapa gravim?trico identificam trends contracionais (de superf?cies S), incompat?veis com a sua interpreta??o como um graben pr?-siluriano, restando as demais alternativas citadas. No tocante ? interpreta??o dos trends no mapa de anomalias magn?ticas (reduzidas ao polo), a maior parte destes ? tentativamente associada a falhas ou zonas de cisalhamento de baixa temperatura (planos C), delimitando blocos distintos em termos de propriedades magn?ticas, e/ou preenchidas por corpos b?sicos. ? tamb?m poss?vel que algumas anomalias magn?ticas isoladas/pontuais correspondam a corpos ?gneos de idade tardi-brasiliana ou mesozoicos. A configura??o desses lineamentos no embasamento pode ser interpretada em analogia ao modelo de fraturas de Riedel, assumindo planos de mergulho acentuado e com se??o de movimento sub-horizontal. Nesta disserta??o, s?o tamb?m exploradas interpreta??es relativas a modelagens gravim?tricas 2D combinadas com a interpreta??o de uma linha s?smica dip ao Lineamento Transbrasiliano. A se??o de rochas equivalente ao Grupo Jaibaras mostrou anomalias gravim?tricas discretas da bacia, conferindo assim uma maior influ?ncia ?s estruturas do embasamento nas respostas gravim?tricas. A delimita??o dos grabens sotopostos ? se??o paleozoica da bacia sofre restri??es causadas pelas heterogeneidades e anisotropia do embasamento. / The objective of this study was to characterize the structural-geophysical expression of the Transbrasiliano Lineament (TBL) in the east-central portion of the Parna?ba Basin. The TBL corresponds to a major Neoproterozoic NE-trending shear zone related to the Brasiliano orogenic cycle, with dextral strike-slip kinematics, underlying (but also laterally exposed in the NE and SW basin edges) the sedimentary section of the Parna?ba Basin. In this study, the interpretation of gravity and magnetic anomaly maps is consistent with the TBL kinematics, the signature of the geophysical anomalies corresponding to the high (plastic behaviour) and subsequent declining temperature (ductile to brittle behaviour) stages during Brasiliano and late Brasiliano times. The pattern of residual gravity anomalies is compatible with an S-C dextral pair shaping the geological bodies of an heterogeneous basement, such as slices of gneisses and granulites (positive anomalies), granitic and low-medium grade metasedimentary rocks (negative anomalies). Such anomalies curvilinear trends, ranging from NNE (interpreted as S surfaces) to NE (C surfaces), correspond to flattening surfaces (S), while the NE rectilinear trend must represent a C band. The narrower magnetic anomalies also display NNE to NE (S surfaces) trends and should correspond to similar (although narrower and more discontinuous) sources in the equivalent anomaly patterns. Pre-Silurian pull-apart style grabens may contribute to the NE negative gravimetric anomalies, although this interpretation demands control by seismic data analysis. On the other hand, the curvilinear anomalies associated to contractional trends are incompatible with their interpretation as pre-Silurian graben, in both maps. In the (reduced to the pole) magnetic anomalies map, most of these are again associated to low-temperature shear zones (C planes) and faults, juxtaposing distinct blocks in terms of magnetic properties, or eventually filled with basic bodies. It is also possible that some isolated magnetic anomalies correspond to igneous bodies of late-Brasiliano or Mesozoic age. The basement late discontinuities pattern can be interpreted in analogy to the Riedel fractures model, with steep dipping surfaces and a sub-horizontal movement section. This study also explored 2D gravity modeling controlled by the interpretation of a dip seismic line as regards to the Transbrasiliano Lineament. The rock section equivalent to the Jaibaras Group occupying a graben structure (as identified in the seismic line) corresponds to a discrete negative anomaly superimposed to a gravimetric high, once again indicating a stronger influence of older crystalline basement rocks as gravimetric sources, mainly reflecting the heterogeneities and anisotropies generated at high temperature conditions and their subsequent cooling along the TBL, during the Brasiliano cycle.

Made available in DSpace on 2015-02-24T19:48:38Z (GMT). No. of bitstreams: 1 VladimirCM_ate_Cap2.pdf: 2326830 bytes, checksum: b58da6e64643f0b1b300b813b8340f81 (MD5) Previous issue date: 2004-11-30 / Companhia de Pesquisa de Recursos Minerais / This thesis aims to advance in the geological knowledge of the region comprising the Pianc?-Alto Br?gida (TPAB) and Alto paje? (TAP) terranes, in the Transversal Zone Domain (Borborema Province, NE Brazil), with the main objective of understanding the geodynamic evolution and the structural framework of these units. To reach this objective, and besides field work and interpretation of traditional aerial photographs, other tools were employed like of remote sensing products (Landsat 7 ETM+, aeroradiometrics, aeromagnetics and topographical images), lithogeochemical (whole rock) analyses and geochronological dating (U-Pb in zircon), besides integration with literature data. In the area, several precambrian geological units outcrop, represented in the TAP by the paleoproterozoic Serra Talhada and Afogados da Ingazeira complexes, Riacho Gravat? Complex (metavolcano-sedimentary sequence of Stenian-Tonian age) and Cariris Velhos orthogneisses (of Tonian age). The TPAB comprises the Santana do Garrote (lower unit) and Serra do Olho d'?gua (upper unit) formations of the Cachoeirinha Group (Neoproterozoic III), besides the Pianc? orthogneisses and Bom Jesus paragneisses; the latter correspond to an older (basement ?) block and a possible high grade equivalent of the Cachoeirinha Group (or Serid? Group ?), respectively. Several Brasiliano-age plutons occur in both terranes.The aeromagnetic data show the continuity, at depth, of the main shear zones mapped in the region. The Patos, Pernambuco, Boqueir?o dos Cochos, Serra do Caboclo, Afogados da Ingazeira/Jabitac? and Congo-Cruzeiro do Nordeste shear zones reach depths greater than to 6-16 km. The aeromagnetic signature of other shear zones, like the Juru one, suggests that these structures correspond to shallower crustal features. The satellite images (Landsat 7 ETM+) and aerogamaspectrometric images discriminate different geological units, contributing to the mapping of the structural framework of the region. The Serra do Caboclo Shear Zone was characterized as the boundary/suture between the TPAB and TAP. This structure is an outstanding, pervasive feature that separates contrasting geological units, such as the Neoproterozoic III Cachoeirinha Group in the TPAB and the Riacho Gravat? Complex and the Cariris Velhos metaplutonics, of Stenian-Tonian age, in the TAP. Occupying different blocks, these units are not found in authoctonous relations, like unconformities and intrusive contacts. Concerning the Cariris Velhos (ca. 1,0 Ga old) event is recorded by radiometric ages of the Riacho Gravat? Complex metavolcanics and intrusive augen and orthogneisses, all of them displaying geochemical affinities of arc or collisional settings. A structural signature of this event was not recorded in the region, possibly due to its low grade/low strain style, obliterated by the overprinting of younger, higher grade/high strain Brasiliano-age fabrics.The first tectonic event (D1) observed in the Cariris Velhos lithotypes presents contractional kinematics with transport to the NW. Neoproterozoic III geochronologic dates, obtained in late-D1 granitoids, imply a Brasiliano age (ca. 610-600 Ma) for this deformation event. The second tectonic event (D2) characterized in the region corresponds to the Brasiliano transcurrent kinematics of the outstanding shear zones and associated granitoid plutons. The geochronological (U-Pb in zircon) data obtained during this thesis also confirms the occurrence of the Cariris Velhos magmatic suite in the TAP, as well as the Neoproterozoic III age to the Cachoeirinha Group in the TPAB. The TAP (Riacho Gravat? Complex, augen and orthogneisses) is interpreted as a continental arc possibly accreted to a microcontinent during the Cariris Velhos (Stenian-Tonian) event. Later on, this terrane collided with the TPAB at the beginning of the Brasiliano orogeny (D1 contractional deformation), and both domins were reworked by the transcurrent shear deformation of the D2 event / A presente tese procurou avan?ar no conhecimento geol?gico da regi?o que abrange os terrenos Pianc?-Alto Br?gida (TPAB) e Alto paje? (TAP) , no Dom?nio da Zona Transversal (Prov?ncia Borborema, NE do Brasil), com o intuito principal de compreender a evolu??o geodin?mica e o condicionamento estrutural destas unidades. Para atingir este objetivo, al?m do trabalho de campo e da interpreta??o de fotografias a?reas tradicionais, foram utilizados outros produtos de sensoriamento remoto (imagens Landsat 7 ETM+, aeroradiom?tricas, aeromagn?ticas e topogr?ficas), an?lises litogeoqu?micas (rocha total) e data??es geocronol?gicas (U-Pb em zirc?o), al?m da integra??o com dados da literatura. Na regi?o afloram v?rias unidades geol?gicas precambrianas, representadas no T AP pelos complexos paleoproteroz?icos de Serra Talhada e Afogados da Ingazeira, Complexo Riacho Gravat? (seq??ncia metavulcanossedimentar de idade Esteniana-Toniana) e ortognaisses Cariris Velhos (Tonianos). No TPAB ocorrem as forma??es Santana do Garrote (unidade inferior) e Serra do Olho d'?gua (unidade superior) do Grupo Cachoeirinha (Neoproteroz?ico III), al?m dos ortognaisses de Pianc? e paragnaisses de Bom Jesus, estes dois ?ltimos podendo constituir um bloco mais antigo (embasamento ?) e um equivalente de alto grau do Grupo Cachoeirinha (ou Grupo Serid? ?), respectivamente. Em ambos os terrenos ainda ocorrem v?rios corpos degranit?ides brasilianos. Os dados aeromagn?ticos permitiram estimar a continuidade, em profundidade, das principais zonas de cisalhamento cartografadas na regi?o. As zonas de cisalhamento de Patos, Pernambuco, Boqueir?o dos Cochos, Serra do Caboclo, Afogados da Ingazeira/Jabitac? e Congo-Cruzeiro do Nordeste atingem profundidades . superiores a 6-16 km. A assinatura aeromagn?tica de outras zonas de cisalhamento, tais como a de Juru, sugere que tais estruturas correspondem a fei??es crustais mais rasas. As imagens de sat?lite (Landsat 7 ETM+) e aerogamaespectrom?tricas permitiram individualizar unidades geol?gicas distintas, bem como esbo?ar a trama estrutural da regi?o.A Zona de Cisalhamento Serra do Caboclo foi caracterizada como o limite/sutura entre o TPAB e TAP, tendo em vista ser uma estrutura marcante/penetrativa que separa unidades geol?gicas contrastantes, como o Grupo Cachoeirinha (Neoproteroz?ico III) no TPAB e o Complexo Riacho Gravat? (Esteniano-Toniano) e as metaplut?nicas Cariris Velhos, do TAP. Embora mais jovem, o Grupo Cachoeirinha n?o exibe contatos em n?o conformidade sobre o Complexo Riacho Gravat? ou ortognaisses Cariris Velhos, indicando que aquelas unidades estavam distanciadas quando da sua deposi??o. Com rela??o ao evento Cariris Velhos (ca. 1,0 Ga), a presen?a do mesmo ? indicada pelas metavulc?nicas do Complexo Riacho Gravat?, augen gnaisses e ortognaisses intrusivos, todos com afinidade geoqu?mica de contextos de arco ou colisional. Todavia, o registro estrutural associado a este evento n?o foi identificado, o que foi interpretado em fun??o de sua oblitera??o (constitu?am estruturas de baixo grau/baixo strain) pelos eventos subseq?entes. O primeiro evento tect?nico (01) observado nos litotipos de idade Cariris Velhos apresenta cinem?tica contracional com transporte para NW. Uma data??o do Neoproteroz?ico III, obtida em granit?ide tardi-D1, permite atribuir uma idade do in?cio do brasiliano para este eventodeformacional. O segundo evento (D2) caracterizado na regi?o corresponde ? tect?nica transcorrente Brasiliana, a qual ? materializada por marcantes zonas de cisalhamento e corpos gran?ticos associados. Os dados geocronol?gicos obtidos (U-Pb em zirc?o) confirmaram a presen?a do magmatismo Cariris Velhos no ?mbito do TAP, bem como a idade Neoproteroz?ica III para o Grupo Cachoeinha (TPAB) e para o evento tect?nico D1. O TAP (Complexo Riacho Gravat?, augen gnaisses e ortognaisses) deve constituir um arco continental (provavelmente acrescido a um microcontinente) formado durante o evento Cariris Velhos (Esteniano-Toniano). Este terreno colidiu com o TPAB no inicio da orog?nese brasiliana (deforma??o tangencial D1), sendo ambos os blocos afetados por retrabalhamento/cisalhamentos transcorrentes (evento D2) at? o final do Ciclo Brasiliano

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-16T20:54:13Z No. of bitstreams: 1 AlexandreRichardsonOliveiraMonteiro_DISSERT.pdf: 13453662 bytes, checksum: 65caee7129893279ce7f0ba762f174b2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-19T00:20:17Z (GMT) No. of bitstreams: 1 AlexandreRichardsonOliveiraMonteiro_DISSERT.pdf: 13453662 bytes, checksum: 65caee7129893279ce7f0ba762f174b2 (MD5) / Made available in DSpace on 2016-08-19T00:20:17Z (GMT). No. of bitstreams: 1 AlexandreRichardsonOliveiraMonteiro_DISSERT.pdf: 13453662 bytes, checksum: 65caee7129893279ce7f0ba762f174b2 (MD5) Previous issue date: 2015-09-25 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A utiliza??o de fertiliza??o qu?mica em per?metros agricult?veis proporciona um incremento da produtividade, embora eventualmente possa ocasionar uma deprecia??o qualitativa do manancial h?drico subterr?neo, sobretudo se este for de natureza n?o confinada. Nesse contexto, o presente trabalho apresenta resultados referentes a uma an?lise do grau de prote??o natural do Aqu?fero Barreiras em uma ?rea situada no litoral leste do Estado do Rio Grande do Norte-Brasil. O referido aqu?fero ? de natureza cl?stica e possui car?ter hidr?ulico n?o confinado, fato este que naturalmente lhe confere uma susceptibilidade ? contamina??o, proveniente de eventuais cargas contaminantes impostas na superf?cie do terreno. Estes contaminantes estariam associados com a lixivia??o de excedentes da fertiliza??o n?o assimilados pela vegeta??o. A metodologia utilizada foi fundamentada na utiliza??o conjunta de dados hidrogeof?sicos, particularmente de modelos inversos de sondagens el?tricas verticais-SEVs e informa??es de perfis de po?os, possibilitando a obten??o de cartografias de condut?ncia longitudinal (S), dada em mili-Siemens (mS), e vulnerabilidade do aqu?fero. Essas cartografias foram elaboradas com ?nfase para a zona n?o saturada sobrejacente, ressaltando sobretudo sua espessura e ocorr?ncia de litologias argilosas. Dessa forma, o mapa de condut?ncia longitudinal e vulnerabilidade revelaram ?reas mais suscept?veis ? contamina??o nos setores nordeste e centro-leste da ?rea de estudo, com valores iguais ou inferiores a 10mS e maiores ou iguais a 0.50, respectivamente. Por outro lado, o setor sudoeste mostrou-se menos suscept?vel ? contamina??es, com valores de condut?ncia longitudinal e ?ndices de vulnerabilidade maiores ou iguais a 35mS e menores ou iguais a 0.40, respectivamente. / The use of chemical fertilization in arable perimeters provides increased productivity, though it can eventually lead to a qualitative depreciation of groundwater sources, especially if such sources are unconfined in nature. In this context, this thesis presents results from an analysis of the level of natural protection of the Barreiras Aquifer in an area located on the eastern coast of the Rio Grande do Norte State - Brazil. Such an aquifer is clastic in nature and has an unconfined hydraulic character, which clearly makes it susceptible to contamination from surface ground loads with contaminants associated with the leaching of excess fertilizers not absorbed by ground vegetation. The methodology used was based on the use of hydro-geophysical data, particularly inverse models of vertical electrical soundings (VES) and information from well profiles, allowing the acquisition of longitudinal conductance cartographies (S), data in mili-Siemens (mS), and the vulnerability of the aquifer. Such maps were prepared with emphasis to the unsaturated overlying zone, highlighting in particular its thickness and occurrence of clay lithologies. Thus, the longitudinal conductance and aquifer vulnerability reveal areas more susceptible to contamination in the northeast and east-central sections of the study area, with values equal to or less than 10mS and greater than or equal to 0,50, respectively. On the other hand, the southwestern section proved to be less susceptible to contamination, whose longitudinal conductance and vulnerability indices are greater than or equal to 30mS and less than or equal to 0,40, respectively.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-16T20:54:14Z No. of bitstreams: 1 AntomatAvelinoDeMacedoFilho_DISSERT.pdf: 31646406 bytes, checksum: f6ba113eebabf49dff56fd9add20f343 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-19T00:32:03Z (GMT) No. of bitstreams: 1 AntomatAvelinoDeMacedoFilho_DISSERT.pdf: 31646406 bytes, checksum: f6ba113eebabf49dff56fd9add20f343 (MD5) / Made available in DSpace on 2016-08-19T00:32:03Z (GMT). No. of bitstreams: 1 AntomatAvelinoDeMacedoFilho_DISSERT.pdf: 31646406 bytes, checksum: f6ba113eebabf49dff56fd9add20f343 (MD5) Previous issue date: 2016-02-19 / Os stocks Serra do Caramuru e Tapuio, localizados no extremo NE do Dom?nio Rio Piranhas-Serid? (RN), s?o representantes do magmatismo ediacarano a cambriano, uma fei??o magm?tica marcante da orog?nese Brasiliana / Panafricana na Prov?ncia Borborema. Estes corpos s?o an?logos litol?gicos, intrusivos no embasamento gn?issico paleoproterozoico, estando separados por uma t?nue faixa de ortognaisses milon?ticos. As rela??es de campo mostram uma estratigrafia magm?tica iniciada pela f?cies dior?tica que coexiste com as f?cies gran?tica porfir?tica e gran?tica equigranular I e, em menor frequ?ncia, com a f?cies gran?tica equigranular II. Estas rochas s?o cortadas por diques e sheets gran?ticos tardios NE-SW a NNE-SSW. A f?cies dior?tica (dioritos, quartzo dioritos, quartzo monzodioritos, tonalitos e granodioritos) ? leucocr?tica a melanocr?tica, rica em biotita e anfib?lio. As f?cies gran?ticas s?o hololeucocr?ticas a leucocr?ticas, com biotita ? anfib?lio. Dados petrogr?ficos e geoqu?micos (rocha total) provenientes em maior propor??o do plut?o Serra do Caramuru, sugerem o fracionamento de zirc?o, apatita, clinopirox?nio (em dioritos), opacos, titanita, biotita, hornblenda, allanita, plagiocl?sio, microcl?nio e granada (em diques). O comportamento dos elementos tra?os Zr, La e Yb indicam que dioritos n?o constituem o magma parental dos granitos. Por outro lado, as f?cies gran?ticas s?o cogen?ticas entre si, apresentando trends de diferencia??o e espectros de elementos terras raras (ETR) an?logos [12.3?(La/Yb)N?190.8; Eu/Eu*=0.37-0.68]. Rela??es de campo e padr?o de ETR [6.96?(La/Yb)N?277.8; Eu/Eu*=0.18-0.58] demonstram que os diques e sheets gran?ticos n?o s?o cogeneticamente relacionados ao magmatismo Serra do Caramuru. A f?cies dior?tica ? metaluminosa (A/CNK = 0.88-0.74), shoshon?tica, ao passo que granitos s?o metaluminosos a peraluminosos (A/CNK = 1.08-0.93), c?lcio-alcalinos de alto pot?ssio. Diques e sheets s?o estritamente peraluminosos (A/CNK = 1.01-1.04). Diagramas bilogar?tmicos relacionando elementos compat?veis e incompat?veis e microtexturas indicam a cristaliza??o fracionada como o mecanismo dominante na evolu??o magm?tica das diversas f?cies. Os stocks Serra do Caramuru e Tapuio mostram trama magm?tica bem preservada, aus?ncia de minerais metam?rficos e s?o estruturalmente isotr?picos, com rela??es de contato discordantes da trama d?ctil do embasamento gn?issico. Estas observa??es conduzem a um est?gio de relativa estabilidade tect?nica, compat?veis com o per?odo de relaxamento orogen?tico da cadeia Brasiliana / Panafricana. Os diagramas qu?micos discriminantes envolvendo ?xidos e elementos tra?os indicam um ambiente tardio ? p?s-colisional. Neste contexto, o mecanismo de coloca??o que melhor explica o alojamento dos stocks seria a abertura de espa?o em fraturas de Ridel tipo T, com vetor de estiramento orientado ENE-WSW. A idade U-Pb de 553 ? 10 Ma permite correlacionar o magmatismo Serra do Caramuru aos grupo de granitoides tardios a p?s-colisionais, c?lcio-alcalinos de alto pot?ssio equigranulares, do extremo NE do Dom?nio Rio Piranhas-Serid?. / The Serra do Caramuru and Tapuio stocks, located in the extreme NE of Rio Piranhas-Serid? Domain (RN), are representative of the Ediacaran-Cambrian magmatism, an important magmatic feature of the Brasilian / Panafrican orogeny of the Borborema Province. These bodies are lithologically similar, intrusive in paleoproterozoic gneiss embasement, being separated by a thin belt of mylonitic orthogneiss. The field relations show a magmatic stratigraphy initiated by dioritic facies that coexists with the porphyritic granitic and equigranular granitic I facies, and less frequently with equigranular granitic II facies. These rocks are crosscut by late granitic dykes and sheets with NE-SW / NNE-SSW orientation. The dioritic facies (diorite, quartz diorite, quartz monzodiorites, tonalite and granodiorite) is leucocratic to melanocratic, rich in biotite and hornblende. The granitic facies are hololeucocratic to leucocratic, and have biotite ? hornblende. Petrographic and geochemical (whole rock) data, especially from Serra do Caramuru pluton, suggest fractionation of zircon, apatite, clinopyroxene (in diorites), opaque minerals, titanite, biotite, hornblende, allanite, plagioclase, microcline and garnet (in dykes). The behavior of trace elements such as Zr, La and Yb indicates that the dioritic magma does not constitute the parental magma for the granitic facies. On the other hand, the granitic facies seems to be cogenetic to each other, displaying differentiation trends and very similar rare earth elements (REE) spectra [12.3?(La/Yb)N?190.8; Eu/Eu*=0.30-0.68]. Field relationships and REE patterns [6.96?(La/Yb)N?277.8; Eu/Eu*=0.18-0.58] demonstrate that the granitic dykes and sheets are not cogenetically related to the Serra do Caramuru magmatism. The dioritic facies is metaluminous (A/CNK = 0.88-0.74) and shoshonitic, whereas the granitic ones are metaluminous to peraluminous (A/CNK = 1.08-0.93) and high potassium calc-alkaline. Dykes and sheets are strictly peraluminous (A/CNK = 1.01-1.04). Binary diagrams relating compatible and incompatible trace elements and microtextures indicate the fractional crystallization as the dominant mechanism of magmatic evolution of the various facies. The Serra do Caramuru and Tapuio stocks have well preserved magmatic fabric, do not show metamorphic minerals and are structurally isotropic, showing crosscutting contact with the ductile fabric of the basement. These observations lead to interpretate a stage of relative tectonic stability, consistent with the orogenic relaxation period of the Brasiliano / Pan-African orogeny. Chemical plots involving oxides and trace elements indicate late to post-collisional emplacement. In this context, the assumed better mechanism to describe the stocks emplacement within an extensional T Riedel joint, with ENE-WSW extensional vector. The U-Pb zircon age of 553 ? 10 Ma allows correlating the Serra do Caramuru magmatism to the group of post-collisional bodies, equigranular high potassium calc-alkaline granites of the NE of Rio Piranhas-Serid? Domain.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-25T20:24:52Z No. of bitstreams: 1 JeanCarlosFerreiraDeLima_TESE.pdf: 23398507 bytes, checksum: fb46bab4c3c63c30912415f64f97c8b4 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-25T22:13:57Z (GMT) No. of bitstreams: 1 JeanCarlosFerreiraDeLima_TESE.pdf: 23398507 bytes, checksum: fb46bab4c3c63c30912415f64f97c8b4 (MD5) / Made available in DSpace on 2016-08-25T22:13:57Z (GMT). No. of bitstreams: 1 JeanCarlosFerreiraDeLima_TESE.pdf: 23398507 bytes, checksum: fb46bab4c3c63c30912415f64f97c8b4 (MD5) Previous issue date: 2016-03-08 / Processos end?genos recentes proporcionam din?mica ? litosfera e geram as mais variadas formas de relevo, mesmo em ?reas de margens continentais passivas, como ? o caso da ?rea de pesquisa deste trabalho, localizada no Nordeste brasileiro. A reativa??o das estruturas do embasamento pr?-cambriano, ap?s a separa??o entre a Am?rica do Sul e ?frica no Cret?ceo, teve um papel importante na evolu??o de suas bacias, o que proporcionou formas de relevo variadas. Estas caracter?sticas morfodin?micas podem ser facilmente percebidas nos sedimentos de borda das bacias marginais, que apresentam fortes ind?cios dessas reativa??es. O objetivo deste trabalho ? investigar a influ?ncia dos processos morfotect?nicos na estrutura??o da paisagem nos sedimentos da Bacia Para?ba. Para tanto foram utilizados dados aeromagn?ticos de alta resolu??o, imagens da Shuttle Radar TopographicMission-SRTM, dados geol?gicos estruturais, dados de po?os profundos e dados geol?gicos de campo. Nos resultados foi observado que algumas estruturas conhecidas no embasamento da Bacia Para?ba coincidem com os lineamentos magn?ticos e topogr?ficos interpretados como reativa??es de falhas do P?s-Mioceno. A atividade neotect?nica ocorrida na Bacia Para?ba teve a capacidade de reorganizar a deposi??o dos sedimentos e de dominar os padr?es das formas de relevo. Dados estruturais adquiridos nas unidades litoestratigr?ficas mostram evid?ncias de atividade tect?nica associada ? deposi??o e eros?o de sedimentos do final do Cret?ceo at? o presente. Isto indica que a deposi??o dos sedimentos p?s-cret?ceos foi influenciada por reativa??es de estruturas do embasamento pr?-cambriano nesta por??o da margem continental brasileira. / Recent endogenous processes provide dynamic movements in the lithosphere and generate the varied forms of relief, even in areas of passive continental margins, such as the research area of this work located in northeastern Brazil. The reactivation of Precambrian basement structures, after the breakup between South America and Africa in the Cretaceous played an important role in the evolution of basins, which provided generated forms of relief. These morphodynamic characteristics can be easily observed in marginal basins that exhibit strong evidence fault reactivations. The purpose of this study is to investigate the influence of morphotectonic processes in the landscape structuring of Para?ba Basin. Therefore, we used aeromagnetic, high?resolution images of the Shuttle Radar Topographic Mission?SRTM, structural geological data, deep well data and geological field data. Based on the results of the data was observed that some preexisting structures in the crystalline basement coincide with magnetic and topographic lineaments interpreted as fault reactivation of the Post?Miocene units in the Para?ba Basin. Faults that offset lithostratigraphic units provided evidence that tectonic activity associated with the deposition and erosion in the Para?ba Basin occurred from Cretaceous to the Quaternary. The neotectonic activity that occurred in Para?ba Basin was able to influence the deposition of sedimentary units and landforms. It indicates that the deposition of post?Cretaceous units was influenced by reactivation of Precambrian basement structures in this part of the Brazilian continental margin.