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Previous issue date: 2015-05-25 / O Lineamento Transbrasiliano ? uma importante zona de cisalhamento com dire??o NE-SW,
relacionada orog nese Brasiliana e que evoluiu em est?gios de alta at? baixa temperatura. No
presente trabalho, investigou-se a assinatura estrutural e geof?sica da por??o norte do Lineamento
Transbrasiliano (fronteira Cear?-Piau?), envolvendo a zona milon?tica brasiliana, o Graben de
Jaibaras e as reativa??es que afetam as sequ?ncias sedimentares p?s-ordovicianas da Bacia do
Parna?ba. Na literatura ? comum a refer?ncia ? reativa??o fanerozoica dessa estrutura, a qual
teria originado diversos grabens tardi-brasilianos precedentes ? sin?clise paleozoica do Parna?ba,
a exemplo do Graben de Jaibaras. As falhas que seccionam as unidades estratigr?ficas da Bacia
do Parna?ba, ao longo de toda a extens?o do Lineamento Transbrasiliano, exprimem a sua
reativa??o em eventos mais jovens. O mapa do campo magn?tico an?malo reduzido ao polo
exibe anomalias com dire??o NE, interpretadas como a assinatura do Lineamento
Transbrasiliano (e das estruturas brasilianas da Prov?ncia Borborema) na sua express?o de alta
temperatura. O Graben de Jaibaras ? marcado por uma faixa an?mala retil?nea com alta
susceptilidade magn?tica (interpretada como o predom?nio de rochas ferromagnesianas,
provavelmente vulc?nicas), aparentemente sem continuidade expressiva no substrato da Bacia do
Parna?ba. A an?lise geom?trica e cinem?tica das estruturas da ?rea enfocada, utilizando dados de
sensores remotos e de campo, permitiu a caracteriza??o de quatro fases de deforma??o fr?gil a
d?ctil-fr?gil Dn, D1, D2 e D3. A fase deformacional Dn, de idade ediacarana-cambriana, ocorre de
modo exclusivo no Graben de Jaibaras, com desenvolvimento de estruturas de temperatura mais
elevada (comparativamente aos eventos mais jovens), d?cteis-fr?geis. As fases deformacionais
D1, D2 e D3 ocorrem afetando tanto o Graben de Jaibaras como as sequ?ncias paleozoicas da
borda NE da Bacia do Parna?ba, com gera??o de estruturas em temperatura baixa, basicamente
r?pteis/catacl?sticas. A an?lise de imagens SRTM permitiu cartografar diversos lineamentos de
dire??o NE, NW e E-W na Bacia do Parna?ba, cuja correla??o com as estruturas mesosc?picas ?
discutida em termos da reativa??o do Lineamento Transbrasiliano em associa??o com os est?gios
de abertura do Atl?ntico e separa??o Am?rica do Sul-?frica, ou mesmo a eventos orog?nicos
distais no Paleozoico. / The Transbrasiliano Lineament is a major shear zone trending NE-SW, related to the Brasiliano
orogeny and evolved through high to low temperature stages. In this study, the structural and
geophysical signature of the northern segment of Transbrasiliano Lineament was studied in its
northern border, between Cear? and Piau? states, involving the Brasiliano mylonite zone, the
Jaibaras Graben and reactivations affecting the sedimentary sequences post-ordovician of
Parna?ba Basin. In the literature, is commonly the phanerozoic reactivation of this structure
referred, generating several late Brasiliano grabens predating the paleozoic Parna?ba syneclises,
like the Jaibaras Graben. Faults that cut the stratigraphic units of the Parna?ba Basin along the
entire length of the Transbrasiliano Lineament express its reactivation during younger events.
The magnetic anomaly field reduced to the pole map exhibit anomalies NE-trending, interpreted
as the signature of the Transbrasiliano Lineament (and Brasiliano structures of the Borborema
Province) in its high-temperature expression. The Jaibaras Graben is marked by a straight
anomalous track with high magnetic susceptibility (interpreted as a prevalence of ferromagnesian
rocks, probably volcanic), apparently without significant continuity in the substrate of Parna?ba
Basin. The geometric and kinematic analysis of the structures in the study area, using remote
sensing and field data, led to the characterization of four deformation phases brittle the ductilebrittle
Dn, D1, D2 and D3. The Dn deformation phase of ediacaran-cambrian age, occurs
exclusively in the Jaibaras Graben, with the development of comparatively higher temperature
(as regards to younger events) ductile-brittle structures. D1, D2 and D3 deformation phases affect
both the Jaibaras Graben as well as the paleozoic sequences of the northeastern edge of Parna?ba
Basin, generating structures developed at lower temperatures, basically brittle/cataclastic. The
SRTM image analysis allowed mapping different NE, NW and E-W trending lineaments in
Parna?ba Basin, whose correlation with mesoscopic structures is discussed in terms of the
reactivation of Transbrasiliano Lineament in association with the stages of general Atlantic
opening and separation between South America and Africa, or even the distal orogenic events in
Paleozoic.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20169 |
| Date | 25 May 2015 |
| Creators | Cacama, Mois?s Samuel Jo?o Bota |
| Contributors | 06892922449, http://lattes.cnpq.br/4094827215552998, Antunes, Alex Francisco, 97038210491, http://lattes.cnpq.br/1519973126832391, Oliveira, Roberto Gusm?o de, 34108904400, http://lattes.cnpq.br/3502030878720766, Jardim, Emanuel Ferraz |
| Publisher | Universidade Federal do Rio Grande do Norte, 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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