Made available in DSpace on 2015-03-13T17:08:34Z (GMT). No. of bitstreams: 1 AlvaroFCR_DISSERT.pdf: 5517718 bytes, checksum: 1478acafe114233a78bc75504cd9500d (MD5) Previous issue date: 2012-12-20 / This study presents new stress orientations and magnitudes from the Potiguar basin in the continental margin of Brazil. We analyzed breakout and drilled induced fractures derived from resistivity image logs run in ten oil wells. We also used direct Shmin measurements determined from hydraulic fractures and rock strength laboratory analysis. In addition, we compared these results with 19 earthquake focal mechanisms located in the crystalline basement. We observed that stress directions and magnitudes change across the basin and its basement. In the basin, the SHmax gradient of 20.0 MPa/km and the SHmax/Shmin ratio of 1.154 indicate a normal stress regime from 0.5 to 2.0 km, whereas the SHmax gradient of 24.5MPa/km and the SHmax/Shmin ratio of 1.396 indicate a strike slip stress regime from 2.5 to 4.0 km. The deeper strike-slip stress regime in the basin is similar to the regime in the basement at 1-12 km deep. This stress regime transition is consistent with an incipient tectonic inversion process in the basin. We also noted that the SHmax direction rotates from NW SE in the western part of the Potiguar basin to E W in its central and eastern part, following roughly the shoreline geometry. It indicates that local factors, as density contrast between continental and oceanic crust and sediment loading at the continental shelf influence the stress field. The concentration of fluid pressure in faults of the lowpermeability crystalline basement and its implications to establish a critically stressed fault regime in the basement is also discussed / Nesse trabalho s?o apresentados novos dados de orienta??o e magnitude de tens?es na Bacia Potiguar. Foram analisados fraturas induzidas e breakouts em 10 po?os na bacia atrav?s da interpreta??o de perfis de imagem microrresistiva.. Foram tamb?m utilizados dados de fraturamento hidr?ulico para estimativa da magnitude da tens?o horizontal m?nima e an?lises de laborat?rio para estimativa da resist?ncia ? compress?o n?o confinada em amostras de testemunho. Adicionalmente, os dados de orienta??o e regime de tens?es obtidos em po?os foram comparados aos resultados de 19 solu??es de mecanismos focais publicados na literatura e localizados na borda cristalina da Bacia Potiguar. Observou-se que a dire??o e a magnitude de tens?es variam atrav?s da bacia e do embasamento circundante. Na bacia, entre as profundidades de 0,5 a 2,0km, estimouse um gradiente de tens?o horizontal m?xima (SHmax) de 20,0 MPa/km, uma raz?o entre as tens?es horizontais (SHmax/Shmin) de 1.154 e um regime de falhas normais. Por outro lado, entre as profundidade de 2,5 a 4,0 km, estimou-se um gradiente de SHmax de 24,5 MPa/km, raz?o entre as tens?es horizontais de 1.396 e uma transi??o para um regime de tens?es transcorrente. O regime transcorrente predomina nos mecanismos focais a profundidade de 1 a 12 km. A transi??o entre um regime de tens?es normal para transcorrente ? consistente com um processo incipiente de invers?o tect?nica instalado na bacia. Al?m disso, observou-se em ambos dados de po?os e mecanismos focais, rota??o na orienta??o de SHmax de NW-SE na por??o oeste da bacia para E-W nas por??es central e leste, acompanhando a geometria da linha de costa. Tais dados indicam que mecanismos locais controlam o campo de tens?es, como contraste de densidade entre crosta oce?nica e continental e carga sedimentar na plataforma continental. Adicionalmente, a concentra??o de transmissibilidade e press?o de fluidos em falhas e fraturas de baixa permeabilidade e sua contribui??o para o estabelecimento de um regime de falhas em equil?brio por fric??o ? tamb?m discutida

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-30T19:21:48Z No. of bitstreams: 1 RosineyAraujoMartins_TESE.pdf: 7437829 bytes, checksum: d70e2a5bdc24f23fa0e528ff3972109f (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-30T23:50:23Z (GMT) No. of bitstreams: 1 RosineyAraujoMartins_TESE.pdf: 7437829 bytes, checksum: d70e2a5bdc24f23fa0e528ff3972109f (MD5) / Made available in DSpace on 2016-03-30T23:50:23Z (GMT). No. of bitstreams: 1 RosineyAraujoMartins_TESE.pdf: 7437829 bytes, checksum: d70e2a5bdc24f23fa0e528ff3972109f (MD5) Previous issue date: 2014-07-01 / A distribui??o das altera??es diagen?ticas em reservat?rio silicicl?stico do Cenomaniano Superior da Bacia Potiguar sofreu influ?ncia do arcabou?o estratigr?fico e do sistema deposicional. Se??es s?smicas e perfis geof?sicos de dois po?os perfurados na por??o SW da citada bacia registram superf?cies estratigr?ficas regionais representativas de inunda??es m?ximas relacionadas a evento transgressivo. Na an?lise sequencial de oitenta metros de testemunhos (~450m de profundidade) foram reconhecidas nove f?cies deposicionais cujo padr?o de empilhamento granodecrescente ascendente limita ciclos com base conglomer?tica erosiva (lag) sobreposta por intercala??es de arenitos m?dios a muito finos com estratifica??es cruzadas (acanalada, planar e de baixo ?ngulo) e horizontais (plano-paralela, wave e flaser). O topo dos ciclos ? marcado pela deposi??o de pelitos e desenvolvimento de paleossolos e laguna. A correla??o de f?cies geneticamente relacionadas revela associa??es de preenchimento de canal, crevasse e plan?cie de inunda??o, depositadas em trato de sistema transgressivo. Descri??es detalhadas de setenta e nove l?minas delgadas auxiliadas por an?lises de MEV-EBSD/EDS, DRX e is?topos est?veis em arenitos revelaram composi??o arcosiana e arranjos texturais complexos com abundantes franjas de esmectita cobrindo continuamente constituintes prim?rios, cut?culas mecanicamente infiltradas e poros m?ldicos e intragranulares. Crescimentos epitaxiais de K-feldspato cobrem continua ou descontinuamente gr?os de microcl?nio e ortocl?sio antes de qualquer outra fase. Abundante pseudomatriz da compacta??o de intraclastos lamosos, concentrados ao longo de planos de estratifica??o, localmente substitu?da por calcita macrocristalina e pirita microcristalina e framboidal. Caulinita (livrinhos e vermicular), esmectita microcristalina, minerais de tit?nio microcristalinos e pirita substituem constituintes prim?rios. Porosidade intergranular predomina sobre a m?ldica, intragranular e de contra??o. Os poros s?o mal conectados devido ? presen?a intergranular de esmectita, crescimentos de K-feldspato, argilas infiltradas e pseudomatriz. Os arenitos foram sujeitos a condi??es eodiagen?ticas pr?ximas ? superf?cie e mesodiagen?ticas de soterramento raso. As altera??es diagen?tica reduziram a porosidade e permeabilidade deposicionais principalmente pela precipita??o de franjas de esmectita, compacta??o de intraclastos lamosos ? pseudomatriz e cimenta??o por calcita poiquilot?pica, caracterizando diferentes petrof?cies de reservat?rio. Esses produtos diagen?ticos atuaram como barreiras e desvios ao fluxo de fluido reduzindo qualidade do reservat?rio. / The distribution of diagenetic alterations in Late Cenomanian siliciclastic reservoirs from Potiguar Basin was influenced by the stratigraphic framework and the depositional system. Seismic sections and geophysical logs of two wells drilled in the SW portion of the mentioned basin above register regional stratigraphic surfaces representing maximum floods related to a transgressive event. The sequential analysis of 80 m of drill core (~450 m deep) recognized nine depositional facies with an upwards granodecrescent standard piling that limits cycles with an erosional conglomeratic base (lag) overlain by intercalations of medium to very fine sandstones showing cross bedding (channel, planar and low angled) and horizontal bedding (plane-parallel , wave and flaser). The top of the cycles is marked by the deposition of pelites and the development of paleosoils and lagoons. The correlation of genetically related facies reveals associations of channel fillings, crevasse, and flood plains deposited in a transgressive system. Detailed descriptions of seventy nine thin sections aided by MEV-EBSD/EDS, DRX and stable isotope analyses in sandstones revealed an arcosian composition and complex textural arrays with abundant smectite fringes continuously covering primary components, mechanically infiltrated cuticles and moldic and intragrain pores. K-feldspar epitaxial overgrowth covers microcline and orthoclase grains before any other phase. Abundant pseudomatrix due to the compactation of mud intraclasts concentrate along the stratification planes, locally replaced by macrocristalline calcite and microcrystalline and framboidal pyrite. Kaolinite (booklets and vermicular), microcrystalline smectite, microcrystalline titanium minerals and pyrite replace the primary components. The intergrain porosity prevails over the moldic, intragrain and contraction porosities. The pores are poorly connected due to the presence of intergranular smectite, k-feldspar overgrowth, infiltrated mud and pseudomatrix. The sandstones were subjected to eodiagenetic conditions next to the surface and shallow burial mesodiagenetic conditions. The diagenetic alterations reduced the porosity and the permeability mainly due to the precipitation of smectite fringes, compactation of mud intraclasts onto the pseudomatrix and cementing by poikilotopic calcite characterizing different reservoir petrofacies. These diagenetic products acted as barriers and detours to the flow of fluids thus reducing the quality of the reservoir.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-07-25T19:35:25Z No. of bitstreams: 1 AlannyChristinyCostaDeMelo_DISSERT.pdf: 4456971 bytes, checksum: 8caf70bc14125d0010bb4e21e9d3aa55 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-07-28T20:49:41Z (GMT) No. of bitstreams: 1 AlannyChristinyCostaDeMelo_DISSERT.pdf: 4456971 bytes, checksum: 8caf70bc14125d0010bb4e21e9d3aa55 (MD5) / Made available in DSpace on 2016-07-28T20:49:41Z (GMT). No. of bitstreams: 1 AlannyChristinyCostaDeMelo_DISSERT.pdf: 4456971 bytes, checksum: 8caf70bc14125d0010bb4e21e9d3aa55 (MD5) Previous issue date: 2016-03-04 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / N?s estudamos a Bacia Potiguar Cret?cea na margem Equatorial do Brasil para entender a geometria das grandes falhas e a influ?ncia da heterogeneidade crustal e o fabric estrutural preexistente na evolu??o da arquitetura interna bacia. Estudos anteriores apontaram que o rifte ? um meio graben assim?trico alongado de dire??o NE-SW. Para determinar o deslocamento m?ximo (Dm?x) e comprimento (L) dos principais segmentos de falha de borda do Rifte Potiguar foram usados s?smica 2D, dados de po?os e modelagem gravim?trica 3D. A modelagem gravim?trica 3D foi parametrizada com os dados de po?os e interpreta??es das se??es s?smicas. O grau de incerteza do modelo gravim?trico foi da ordem 10% aos dados s?smicos e de po?os. Atrav?s das curvas de crescimento de falhas foi poss?vel dividir as falhas de borda do rifte em quatro segmentos principais, os quais forneceram valores Dm?x/L da mesma ordem de grandeza. As curvas de crescimento de falhas sugerem que um mecanismo tect?nico uniforme regional teria influenciado o crescimento dos segmentos dessas falhas. As varia??es dos deslocamentos m?ximos ao longo dos segmentos de falha indicam que estes segmentos se desenvolveram de forma independente durante o in?cio do rifteamento e, posteriormente, foram unidos por liga??es rig?das e flex?veis. Este ?ltimo, chegou a formar uma rampa de al?vio entre as falhas de Baixa Grande e Carnaubais. Nos pontos de interliga??o entre falhas as taxas Dm?x / L s?o mais elevadas devido ? interfer?ncia do crescimento dos segmentos de falha adjacentes. A evolu??o do Rifte Potiguar foi dividida em cinco etapas com base nas rela??es Dm?x/L, que foram correlacionadas com as principais fases tect?nicas da separa??o entre a Am?rica do Sul e ?frica no Cret?ceo Inferior. / The discussion about rift evolution in the Brazilian Equatorial margin during the South America-Africa breakup in the Jurassic/Cretaceous has been focused in many researches. But rift evolution based on development and growth of faults has not been well explored. In this sense, we investigated the Cretaceous Potiguar Basin in the Equatorial margin of Brazil to understand the geometry of major faults and the influence of crustal heterogeneity and preexisting structural fabric in the evolution of the basin internal architecture. Previous studies pointed out that the rift is an asymmetrical half-graben elongated along the NE-SW direction. We used 2D seismic, well logs and 3D gravity modeling to analyze four major border fault segments and determine their maximum displacement (Dmax) and length (L) ratio in the Potiguar Rift. We constrained the 3D gravity modeling with well data and the interpretation of seismic sections. The difference of the fault displacement measured in the gravity model is in the order of 10% compared to seismic and well data. The fault-growth curves allowed us to divide the faulted rift border into four main fault segments, which provide roughly similar Dmax/L ratios. Fault-growth curves suggest that a regional uniform tectonic mechanism influenced growth of the rift fault segments. The variation of the displacements along the fault segments indicates that the fault segments were formed independently during rift initiation and were linked by hard and soft linkages. The latter formed relay ramps. In the interconnection zones the Dmax/L ratios are highest due to interference of fault segment motions. We divided the evolution of the Potiguar Rift into five stages based on these ratios and correlated them with the major tectonic stages of the breakup between South America and Africa in Early Cretaceous.

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.

Made available in DSpace on 2014-12-17T15:25:23Z (GMT). No. of bitstreams: 1 OliviaMMN.pdf: 1313432 bytes, checksum: cd671cebc6305a39cdbfe9efea69abf0 (MD5) Previous issue date: 2007-03-29 / The aim of this work is to analyze the spatial frames of reference of the Serid? a region Iocated in the hinterlands of Rio Grande do Norte state from the following texts: Homens de Outrora (1941), by Manuel Dantas; Serid? (1954), by Jos? Augusto Bezerra de Medeiros; Velhos Costumes do Meu Sert?o (1965), by Juvenal Lamartine de Faria; and Sert?es do Serid? (1980), by Oswaldo Lamartine de Faria. The historiographical discourse will be investigated as to representations of space and the frames of reference that demarcate it. We highlight the space of 1 as delimited by the subjectivity and significances expressed by each author, considering closely the relation between author, writing and body, either in historiography or in the subjects that give shape to the Serid? region in their writings. The Serid? is particularly framed in the relevant historiography as the hinterland (sert?o) space, where the drought is a representation referred to recurrently, and as a space of fight , in which man and nature would be in constant struggle, challenging each other. Spatial frames of reference are then situated between the 1 and notions of hinterland and fight with nature / O objetivo deste trabalho ? analisar as configura??es espaciais do Serid? potiguar situado na por??o centro-meridional do Estado do Rio Grande do Norte a partir das seguintes obras: Homens de Outrora (1941), de Manuel Dantas; Serid? (1954), de Jos? Augusto Bezerra de Medeiros; Velhos Costumes do Meu Sert?o (1965), de Juvenal Lamartine de Faria e Sert?es do Serid? (1980), de Oswaldo Lamartine de Faria, O discurso historiogr?fico ser? indagado quanto ?s representa??es de espa?o e ?s configura??es que o (de)marcam. Destacamos o espa?o do eu (de)marcado pelas subjetividades e significa??es de cada autor, considerando a rela??o entre autor, escrita e corpo, seja o da historiografia ou dos sujeitos que d?o forma ao Serid? em seus escritos. E os espa?os do Sert?o e de Luta. O Serid? no discurso historiogr?fico ? configurado como espa?o do sert?o, onde a seca se constitui como representa??o recorrente e como espa?o de luta em que, homem e natureza estariam em um constante combate, um desafiando o outro. As configura??es espaciais para o Serid? se d?o entre o eu e as no??es de sert?o e luta com a natureza

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-14T22:30:44Z No. of bitstreams: 1 EdnajaFaustinoSilvaDeMoura_DISSERT.pdf: 3529715 bytes, checksum: a056afe4c7898c8859247b99fee73d92 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-16T19:14:00Z (GMT) No. of bitstreams: 1 EdnajaFaustinoSilvaDeMoura_DISSERT.pdf: 3529715 bytes, checksum: a056afe4c7898c8859247b99fee73d92 (MD5) / Made available in DSpace on 2017-03-16T19:14:00Z (GMT). No. of bitstreams: 1 EdnajaFaustinoSilvaDeMoura_DISSERT.pdf: 3529715 bytes, checksum: a056afe4c7898c8859247b99fee73d92 (MD5) Previous issue date: 2016-08-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O principal objetivo deste trabalho foi analisar as principais a??es realizadas e dificuldades encontradas pelas arenas p?blicas no processo de planejamento e gest?o do polo tur?stico Serid?/RN. J? os objetivos espec?ficos foram: a) caracterizar as ?Inst?ncias de Governan?a? do turismo na regi?o do Serid?; b) levantar o perfil dos diferentes atores que comp?em as arenas p?blicas que discutem o turismo; c) investigar os mecanismos de participa??o dos atores nos processos decis?rios e seus pap?is na cadeia produtiva do turismo; d) levantar as principais a??es j? efetivadas no polo relacionado ao processo de desenvolvimento regional. Os procedimentos metodol?gicos utilizados foram a pesquisa bibliogr?fica, bem como documental, tendo car?ter explorat?rio/descritivo. A pesquisa adotou a abordagem qualitativa empregando como instrumentos de coleta de dados entrevistas semiestruturadas. Para tratar os dados foi adotada a t?cnica de an?lise de conte?do, al?m disso, foi realizado um registro fotogr?fico com vistas a levantar imagens que possam contribuir com a pesquisa. Com isso foi poss?vel concluir que a constitui??o da inst?ncia de governan?a em turismo, vem possibilitando novas discuss?es acerca da gest?o e planejamento do turismo na regi?o Serid? Potiguar. Observou-se ainda que existem dificuldades que comprometem o incremento do turismo na regi?o, bem como que as a??es desenvolvidas pela inst?ncia de governan?a do Polo Serid? ainda s?o pontuais, fator este que interfere na din?mica socioespacial e no pr?prio desenvolvimento tur?stico da regi?o. / The main objective of this study was to analyze the main actions taken and difficulties encountered by public arenas in the planning process and tourist hub management Serid? / RN. Already the specific objectives were: a) characterize the "Instances of governance" of tourism in the Serid? region; b) raise the profile of the different actors in the public arenas discussing tourism; c) investigate the mechanisms of stakeholder participation in decision-making processes and their roles in the productive chain of tourism; d) identify the main actions already effective on the pole related to the regional development process. The methodological procedures used were literature and documentary, with exploratory / descriptive. The research adopts a qualitative approach using as data collection instruments semi-structured interviews. To address the data has adopted the content analysis technique, furthermore, it was made a photographic record in order to get images that can contribute to the research. It was concluded that the establishment of the governance body in tourism, It is making possible new discussions of management and tourism planning in the Potiguar Serid? region. It was also observed that there are difficulties that compromise the growth of tourism in the region, and that the actions taken by the governance body of the Polo Serid? are still off, a factor that interferes with the socio-spatial dynamics and own tourism development in the region.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-09-05T19:49:54Z No. of bitstreams: 1 KayckDannyBezerraDeAraujo_DISSERT.pdf: 2339702 bytes, checksum: 116c2de870313b551186d64e35380822 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-09-15T22:35:50Z (GMT) No. of bitstreams: 1 KayckDannyBezerraDeAraujo_DISSERT.pdf: 2339702 bytes, checksum: 116c2de870313b551186d64e35380822 (MD5) / Made available in DSpace on 2017-09-15T22:35:50Z (GMT). No. of bitstreams: 1 KayckDannyBezerraDeAraujo_DISSERT.pdf: 2339702 bytes, checksum: 116c2de870313b551186d64e35380822 (MD5) Previous issue date: 2017-05-12 / O Programa de Interioriza??o da Ind?stria T?xtil (PR?-SERT?O) ? uma pol?tica p?blica de responsabilidade do Governo do Estado do Rio Grande do Norte que objetiva a interioriza??o da produ??o t?xtil por meio de incentivos fiscais e cria??o de aportes necess?rios para o desenvolvimento da cadeia produtiva t?xtil. O objeto desta disserta??o ? analisar se a terceiriza??o das ?ind?strias ?ncoras? para as ?fac??es de costura? que emergem e/ou se situam no contexto dessa pol?tica foram ou n?o respons?veis por precarizar o trabalho existente no Serid? Potiguar. O marco te?rico que sustentou o presente estudo foi pautado nos conceitos de Terceiriza??o, Precariza??o do Trabalho e Arranjos Institucionais. A partir da?, realizou-se, uma pesquisa qualitativa de natureza indutiva pautada em estudos bibliogr?ficos e documentais, bem como pesquisa de campo, por meio de visitas in loco ?s fac??es de costura, onde, ainda, fez-se aplica??o de question?rios e realiza??o de entrevistas que serviram de base para uma sistematiza??o entre teoria proposta e a pr?tica observada. A abordagem de pesquisa utilizada foi um estudo de caso, junto aos munic?pios de Acari e de Cruzeta, situados no territ?rio do Serid? Oriental Potiguar, estado do Rio Grade do Norte (RN), no per?odo 2013 a 2016. Os resultados obtidos apontam para a exist?ncia de uma precariza??o das rela??es trabalhistas nas fac??es de costura. Estas, apesar de absorverem parte da popula??o desocupada e fazerem a m?quina econ?mica ?ziguezaguear?, tiveram timidamente ou nunca tiveram propuls?o do PR?-SERT?O. Pois, mesmo com toda envergadura sugerida pelo discurso oficial, ainda se trata de um programa que tem dificuldades de implementa??o no territ?rio seridoense. O estudo concluiu que a precariza??o das rela??es trabalhistas nas fac??es dos territ?rios estudados ocorreu com relativa facilidade porque ocorreu num territ?rio marcado pela vulnerabilidade social, tendo em vista a exist?ncia de um n?mero reduzido de postos de trabalhos - formais e informais, at? a implanta??o das fac??es -, e, ainda, de altos ?ndices de desocupa??o que permitiram a pr?tica da subcontrata??o pelas empresas. / The Textile Industry Interiorization Program (PR?-SERT?O) is a Public Politics of responsibility for the Government of the State of Rio Grande do Norte, which aims at the interiorization of textile production through fiscal incentives and creation of resources necessary for the development of the textile production chain. The objective of this dissertation is to analyze if this outsourcing of the "anchor industries" to the "sewing factions" hat emerge and / or fall within the context of this policy were responsible for precarious work in the Serid? Potiguar region. The theoretical milestone that claimed this study was based on concepts of Outsourcing, Precarious Employment and Institutional Tinkering. From then on, a qualitative research of an inductive nature was carried out based on bibliographical and documentary studies, as well as field research through visits to the sites of the sewing factions, where the application of questionnaires and interview was made that served as a basis for a systematization between the proposed theory and the observed practice. The research approach used in the case study with the municipalities of Acari and Cruzeta, located in the territory of Serid? Oriental Potiguar, state of Rio Grande do Norte, from 2013 to 2016. The results obtained point to the precariousness of labor relations in the sewing factions. Although these factions absorb part of the population, they have never propulsion of PR?-SERT?O. For, even with all the investments suggested by the official speeches, it is still a program that has difficulty implementing in the Serido territory. The study concluded that the precarious employment of labor relations in the factories of the territories studied occurred with relative ease because it occurred in a territory marked by social vulnerability, with a view the existence of a reduced number of jobs ? formal and informal until the creation of the factions -, and still of high rates of unemployment which allow the practice of subcontracting by companies.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-04T19:34:39Z No. of bitstreams: 1 IgorRasecBatistaDeAzevedo_DISSERT.pdf: 6448715 bytes, checksum: c8fe360a95e24193e03e625f0858bae3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-10T00:19:40Z (GMT) No. of bitstreams: 1 IgorRasecBatistaDeAzevedo_DISSERT.pdf: 6448715 bytes, checksum: c8fe360a95e24193e03e625f0858bae3 (MD5) / Made available in DSpace on 2017-10-10T00:19:40Z (GMT). No. of bitstreams: 1 IgorRasecBatistaDeAzevedo_DISSERT.pdf: 6448715 bytes, checksum: c8fe360a95e24193e03e625f0858bae3 (MD5) Previous issue date: 2017-03-17 / A produ??o de artefatos t?xteis distribui-se espacialmente no Rio Grande do Norte de modo concentrado nas regi?es Metropolitana de Natal e Serid? Potiguar. Esta ?ltima abriga, aproximadamente, metade das unidades produtivas do estado, onde se destaca o ramo de artefatos dom?sticos. A atividade concentra-se, outrossim, no interior da pr?pria regi?o, sobretudo em sua por??o ocidental, nos munic?pios de Caic?, Currais Novos e Jardim de Piranhas, cuja estrutura produtiva baseia-se em tecnologias obsoletas, em rela??o aos processos produtivos baseados em um elevado grau de capitaliza??o, com a origem local ou regional do capital e uso intensivo de m?o de obra barata e pouco qualificada. Diante do exposto, o presente trabalho tem como questionamento central: como uma atividade com as caracter?sticas da produ??o de artefatos t?xteis no Serid? Potiguar consegue lograr inser??o na din?mica atual dos circuitos espaciais produtivos e coexistir com os sistemas t?cnicos de ordem planet?ria? Desse modo, busca-se analisar o uso do territ?rio pelo circuito espacial produtivo t?xtil, com ?nfase na produ??o de artefatos dom?sticos a partir dos processos, din?mica e conte?do desta na regi?o do Serid? Potiguar. Para o desenvolvimento da pesquisa, realizou-se revis?o bibliogr?fica, sobretudo a partir de Andrade (1981), Arroyo (2008), Azevedo (2007, 2013), Barrios (2014), Castillo e Frederico (2010), Furtado (1969), Marx (1990, 2011), Moraes (1984), Santos (2012) e Silveira (2010b). Ademais, adotaram-se procedimentos te?rico-metodol?gicos de coleta e sistematiza??o de dados, baseados nas t?cnicas de pesquisa documental, pesquisa de campo ? na qual executou-se a aplica??o de entrevistas com base em roteiros semiestruturados e formul?rios ? articulada com uma base estat?stica. Constatou-se, atrav?s da pesquisa, que, tratando-se do circuito espacial da produ??o de artefatos t?xteis no Serid? Potiguar, os fluxos de mat?ria-prima s?o oriundos principalmente da pr?pria regi?o Nordeste, materializando a exist?ncia de monop?lio no fornecimento desses bens, controlado por empresas do Cear? com filiais no Rio Grande do Norte. Os fluxos do consumo produtivo de m?quinas e equipamentos s?o oriundos exclusivamente da regi?o concentrada, notadamente de S?o Paulo. Por outro lado, o consumo consuntivo ? marcadamente pulverizado, abrangendo sobretudo o Nordeste, e, com menor express?o, as regi?es Norte e Sudeste. Foi poss?vel depreender, outrossim, que o processo de circula??o ? completamente alienado, haja vista que as firmas locais det?m uma capacidade relativa de produ??o, todavia, por ocuparem posi??es subalternas no territ?rio, n?o det?m poder de mercado suficiente para realizar o seu controle, outorgando-lhe a a??o de atravessadores. Nessa esfera, a uni?o vertical dos lugares se sobrep?e em grande medida aos nexos horizontais coadunados ao uso produtivo do territ?rio do Serid? Potiguar. Considera-se que a baixa coes?o social e produtiva entre os agentes do ramo t?xtil verificada no referido recorte se d? pela aus?ncia, em certa medida proposital, do Estado, enquanto promotor de pol?ticas p?blicas, e em detrimento do desenvolvimento da pr?pria atividade na regi?o. As acanhadas iniciativas do Poder P?blico insistem em pensar os ramos produtivos isoladamente, e n?o o territ?rio usado como um todo, isso quando n?o legam, arbitrariamente, o seu papel aos interesses corporativos. / The production of textile artifacts is spatially distributed in the state of Rio Grande do Norte in a way that it is concentrated in the metropolitan area of Natal and in the Serid? Potiguar region. The later houses 49% of the total of production units of the State, with emphasis on the domestic utensils field (FIERN, 2017). The activity is likewise concentrated within the region itself, especially in its western half, in the municipalities of Caic?, Currais Novos and Jardim de Piranhas. Their productive structure is based on obsolete techniques and technologies, with the origin of the capital being local or regional and intensive use of cheap and low-skilled labour. In view of the above, the present study has as central question: how can an activity with the characteristics of the production of textile artefacts in Serid? Potiguar be successfully inserted in the current dynamics of spatial circuits of production and, moreover, coexist with the hegemonic technical systems of planetary order? Therefore, the aim is to analyze the use of the territory by the spatial circuit of textile production, with emphasis on the production of domestic utensils, through its processes, dynamics and content in the region of the Serid? Potiguar. For the development of the research, a bibliographical review was carried out, mainly from Andrade (1981), Arroyo (2008), Azevedo (2007, 2013), Barrios (2014), Castillo and Frederico (2010), Furtado (1969), Marx (1990, 2011), Moraes (1984), Santos (2012) and Silveira (2010b). Furthermore, some theoretical and methodological procedures were adopted to collect and systematize data, based on the techniques of documentary research, field research - in which interviews were executed based on semi-structured scripts and forms - articulated with a spatial descriptive statistical baseline. It was determined, through the research, that in the spatial of production of textile artefacts in Serid? Potiguar, the raw material flow derives mainly from the Northeast region itself, materializing the existence of a monopoly, in these assets supply, controlled by companies from Cear? with subsidiaries in Rio Grande do Norte. The machine's productive consumption flow and equipment comes exclusively from the Concentrated Region, notably from S?o Paulo. Conversely, the consumptive consumption is markedly sprayed, embracing mainly the Northeast and, in a lesser extent, the North and Southeast region. It was possible to conclude that the circulation process is completely alienated, considering that local companies have a relative capacity of production, however, as they occupy subaltern positions in the territory, they do not own market power to hold their control, awarding themselves the middlemen action. In this field, the places vertical union overlaps to a great extent to the horizontal links with the productive use of the Serid? Potiguar territory. Considering that the low social and productive cohesion between the textile field agents verified in the mentioned cut by means of the absent, to a certain extent, of the State, as a public policies promoter, and in detriment of the development of the activity itself in the region. The shy initiatives of the Public Power insists on thinking about the productive branches in isolation, and not the territory used as a whole, when they do not arbitrarily transfer their role to the corporative interests.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-04T19:45:16Z No. of bitstreams: 1 JulianaAparecidaGoncalvesLopes_DISSERT.pdf: 6908423 bytes, checksum: adf870a414cc76ebcff90a78b5a86557 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-10T23:17:13Z (GMT) No. of bitstreams: 1 JulianaAparecidaGoncalvesLopes_DISSERT.pdf: 6908423 bytes, checksum: adf870a414cc76ebcff90a78b5a86557 (MD5) / Made available in DSpace on 2017-10-10T23:17:13Z (GMT). No. of bitstreams: 1 JulianaAparecidaGoncalvesLopes_DISSERT.pdf: 6908423 bytes, checksum: adf870a414cc76ebcff90a78b5a86557 (MD5) Previous issue date: 2017-08-01 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / A an?lise quantitativa da subsid?ncia tect?nica contribui para identifica??o dos mecanismos que formam as bacias sedimentares, uma vez que a configura??o tect?nica desempenha uma fun??o principal na evolu??o destas bacias. A Bacia Potiguar, localizada na Margem Equatorial Brasileira, apresenta sua evolu??o relacionada a processos de rifteamento complexos, implementados durante a abertura do Oceano Atl?ntico no Jur?ssico/Cret?ceo. Esses processos foram respons?veis pelo desenvolvimento de um rifte emerso abortado, e um rifte submerso, que evoluiu at? a ruptura crustal e forma??o da margem continental transformante. N?s aplicamos a t?cnica de backstripping para quantificar a subsid?ncia tect?nica durante as fases rifte e p?s-rifte da Bacia Potiguar, e analisar a varia??o espacial da subsid?ncia durante os dois eventos tect?nicos, sucessivos e distintos, respons?veis pela evolu??o da bacia. Os par?metros necess?rios para aplica??o desta metodologia foram obtidos por meio de linhas s?smicas 2D e dados de po?os explorat?rios. As curvas de subsid?ncia tect?nica apresentam per?odos com taxas de subsid?ncia moderadas (at? 300 m/Ma), que correspondem a evolu??o do Rifte Potiguar emerso (~141 a 128 Ma). A partir de 128 at? 118 Ma, as curvas apresentam taxas de subsid?ncia nulas para o rifte emerso, enquanto que, altas taxas de subsid?ncia tect?nica (acima de 300 m/Ma) foram registradas no rifte submerso. Durante a fase p?s-rifte, que ocorre a partir de 118 Ma, as taxas de subsid?ncia tect?nica diminu?ram exponencialmente para valores menores que 35 m/Ma, provavelmente relacionadas ? subsid?ncia termal. As taxas de subsid?ncia tect?nica nos v?rios setores do Rifte Potiguar durante as diferentes fases de rifteamento indicam falhamentos mais intensos na parte sul da falha de Carnaubais, ao longo das principais falhas de borda, e na regi?o sudeste do rifte submerso. Durante a fase p?s-rifte, as taxas de subsid?ncia tect?nica aumentam da por??o emersa para a submersa at? a regi?o da quebra da plataforma. As taxas mais altas de subsid?ncia do p?s-rifte (at? 35 m/Ma) est?o concentradas na regi?o central da por??o submersa, e podem estar relacionadas a processos litosf?ricos relacionados ? ruptura da crosta continental e espalhamento oce?nico. A varia??o nas taxas de subsid?ncia e no padr?o das curvas de subsid?ncia nos permitiu interpretar a assinatura tect?nica registrada pelas sequ?ncias sedimentares da Bacia Potiguar durante sua evolu??o. No rifte emerso, as curvas apresentaram taxas de subsid?ncia de at? 300m/Ma durante uma longa fase de rifteamento (13 Ma), o que confirmou o desempenho de um regime distensional nesta por??o. No rifte submerso, as curvas apresentaram taxas de subsid?ncia acima de 300 m/Ma em um intervalo de tempo mais curto (5 a 10 Ma), t?picas de bacias formadas por um regime transtensional. / The quantitative analysis of the tectonic subsidence sheds light on basin-forming mechanisms, since tectonic plate motions play the main role in the genesis of sedimentary basins. The Potiguar Basin, located in the Brazilian Equatorial Margin, presents an evolution related to a complex rifting process, implemented during the Atlantic Ocean opening in the Jurassic/Cretaceous. Different driving mechanisms were responsible for the onset of an aborted onshore rift and an offshore rift, which evolved to crustal rupture and formation of a continental transform margin. Therefore, we applied the backstripping method to quantify the tectonic subsidence during the rift and post-rift phases of the Potiguar Basin and to analyze the spatial variation of subsidence during the two successive and distinct tectonic events responsible for the basin evolution. The parameters required to apply this methodology were extracted from 2D seismic lines and exploratory well data. The tectonic subsidence curves present periods with moderate subsidence rates (up to 300 m/My), which correspond to the evolution of the onshore Potiguar Rift (~141 to 128 Ma). From 128 to 118 Ma, the curves show null subsidence rates in the onshore Potiguar Basin, whereas high subsidence rates (over 300 m/My) occurred in the offshore rift. The post-rift phase had begun at ca. 118 Ma (Aptian), when the tectonic subsidence drastically slowed down to less than 35 m/My, probably related to thermal subsidence. The tectonic subsidence rates in the various sectors of the Potiguar Rift during the different rift phases indicate more intense faulting in the southern portion of the onshore rift, along the main border faults, and in the southeastern portion of the offshore rift. During the post-rift phase, the tectonic subsidence rates increased from onshore to the offshore portion until the continental slope. The highest rates of post-rift subsidence (up to 35 m/My) are concentrated in the central region of the offshore portion, and may be related to lithospheric processes related to the continental crust rupture and oceanic seafloor spreading. The variation in subsidence rates and the pattern of subsidence curves allowed us to interpret the tectonic signature recorded by the sedimentary sequences of the Potiguar Basin during its evolution. In the onshore rift, the curves presented subsidence rates up to 300 m/My during a long-term rift phase (13 Ma), which confirmed an extensional regime in this portion. In the offshore rift, the curves presented high subsidence rates over 300 m/My in a shorter period (5 to10 My), typical of basins formed in a transtensional regime.