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Previous issue date: 2016-08-09 / A borda sudeste da Bacia do Parna?ba (BPar), regi?o fronteiri?a aos estados do Piau?, Bahia e
Pernambuco, ? marcada por uma expressiva orienta??o NE-SW, paralela ? do Lineamento
Transbrasiliano, bem como pelo estreitamento das faixas aflorantes das forma??es silurodevonianas,
em compara??o ao observado na borda leste da bacia do Parna?ba (BPar). A evid?ncia
de controle estrutural nessa borda da bacia foi analisada com a interpreta??o de imagens de relevo
sombreado, geradas a partir de imagens de radar. Foram destacados os fotolineamentos com
dire??o preferencial NE-SW no embasamento cristalino e na cobertura sedimentar, bem como na
regi?o de contato entre esses dom?nios. Foi realizada uma an?lise integrada das estruturas
observadas em macroescala (imagens de radar e multiespectrais) e em campo (mesoescala),
resultando na caracteriza??o de tr?s eventos deformacionais, com base em crit?rios de orienta??o,
cinem?tica e cronologia relativa. As estruturas da deforma??o Dn foram reconhecidas no
embasamento cristalino e nas sequ?ncias mol?ssicas das bacias de Ara?? e S?o Juli?o, sendo
correlacionadas ao contexto do Grupo Jaibaras, no NW do Cear?, com idade ediacaranacambriana.
Esse evento deformacional est? associado a uma etapa tardia, retrometam?rfica e de
car?ter pl?stico-fr?gil, das zonas milon?ticas brasilianas. A assinatura do mesmo inclui zonas de
cisalhamento dextrais orientadas NE-SW, e veios ?cidos preenchendo bandas C dilatacionais e
juntas de distens?o E-W. A deforma??o Dn+1 corresponde a uma nova etapa de movimenta??o
dextral em estruturas NE-SW, acompanhada por falhas normais e juntas de distens?o com
orienta??o WNW a E-W, essencialmente de car?ter fr?gil e tamb?m afetando as unidades silurodevonianas.
A deforma??o Dn+2 ? caracterizada por falhas normais, diques b?sicos
(correlacionados ? Suite Sardinha, eocret?cea), veios silicosos (preenchendo descontinuidades nas
rochas), todos com orienta??o NE-SW. As falhas NE-SW podem ocorrer no contato entre o
embasamento e a cobertura sedimentar ou j? no interior da bacia. Esse evento ? resultado de uma
distens?o com orienta??o NW-SE, an?loga ?quela reconhecida mais a leste, nas Bacias Interiores
do Nordeste do Brasil, associada ao rifteamento do Atl?ntico Sul. / The southeast border of the Parna?ba Basin (BPar), which follows the borders between the Piau?,
Bahia and Pernambuco states, is characterized by an expressive NE trend parallel to the one of the
Transbrasiliano Lineament, as well as a narrowing of the outcropping belt of the Silurian-Devonian
formations, as compared to the situation in the east basin border. The evidence of a structural
control in this basin border was analysed interpreting hillshade images obtained from radar
imagery. NE-trending photolineaments were highlighted in the crystalline basement and in the
sedimentary cover, as well as in the contact zone between these domains. An integrated analysis
of macroscale (radar and multispectral images) and mesoscale (outcrop data) structures, lead to
the characterization of three deformation events on the basis of their orientation, kinematics and
chronology. Dn structures were recognized in the crystalline basement and molassic sequences of
Ara?? and S?o Juli?o basins, being correlated to same context of the Jaibaras Group, in NW Cear?,
of Ediacaran-Cambrian age. This deformation event is related to a retrometamorphic, plasticbrittle
late stage of Brasiliano mylonite zones. Its signature includes NE-trending dextral
transcurrent shear zones, as well as acid veins filling dilational C bands and E-W extension joints.
Dn+1 deformation corresponds to a new stage of dextral movement along the NE-trending
structures, accompanied by normal faults and extension joints oriented WNW to E-W, in this case
overprinting the Silurian-Devonian formations. Dn+2 deformation is characterized by normal faults,
basic dykes (correlated to the Eocretaceous Sardinha Suite) and siliceous veins (filling anisotropy
in rocks), all of them following a NE-SW trend. The NE-trending faults may occur in the contact
between basement and the sedimentary cover, or inside the basin. This event resulted from a NWSE
extension, analogous to the one recognized further east in the Northeast Brazil Interior Basins,
associated to the South Atlantic rifting.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22095 |
| Date | 09 August 2016 |
| Creators | Lima, Francisco Gabriel Ferreira de |
| Contributors | 06892922449, http://lattes.cnpq.br/4094827215552998, Silva, Fernando Cesar Alves da, 15461483453, http://lattes.cnpq.br/8572129314081197, Medeiros, Vladimir Cruz de, 28943180497, http://lattes.cnpq.br/9369889068441214, Jardim, Emanuel Ferraz |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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