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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Express?o em superf?cie do sistema de falhas Po?o Verde-cara?bas, Bacia Potiguar

Santos, Rafael Duarte 28 February 2011 (has links)
Made available in DSpace on 2015-03-13T17:08:30Z (GMT). No. of bitstreams: 1 RafaelDS_DISSERT.pdf: 4082190 bytes, checksum: dabe52ff23738bb49110e1bc03f1b41a (MD5) Previous issue date: 2011-02-28 / The structural knowledge of the western portion of the Potiguar Basin is still in its infancy, especially these related to NW-trending fault systems. This paper analyzes the Po?o Verde-Cara?bas Fault System, which was initially recognized in subsurface. The activities involved in this study correspond to remote-sensing analysis and, in particular, to the geometric and kinematic analysis of post-rift sequences of the basin. In addition, the study aimed to determine the stress fields operating in the area. The studies were carried out in an area of 1,000 km?, located in the western portion of Potiguar Basin along the Po?o Verde-Cara?bas Fault System, Rio Grande do Norte State. The remote sensing imagery indicates a predominance of NW-SE-trending lineaments, consistent with the fault system under study, followed by the NE-SW, N-S and E-W directions. The tectonic structures mapped were analyzed only in outcrops of the Janda?ra Formantion. They are joints (filled or not) in all directions, but with predominance of the NW-trending joints. Faults are usually N-S-trending normal faults and NW-SE and NE-SW-trending strike-slip faults. Geodynamic analysis identified two tectonic stress fields: the first field, "Field 1" is represented by an N-S-trending horizontal compression and E-W-trending horizontal extension. This field affected the Potiguar Basin at least until the Miocene. The second field, "Field 2", is represented by an E-W-trending horizontal compression and N-S-trending horizontal extension. This is the present-day stress field and has affected the Potiguar basin since the Pliocene / O conhecimento estrutural da por??o oeste da Bacia Potiguar ainda ? incipiente, principalmente aquele relacionado aos sistemas de falhas NW-SE. Esta disserta??o analisa o Sistema de Falhas Po?o Verde-Cara?bas, onde foi inicialmente individualizado em subsuperf?cie. As atividades realizadas inerentes a este estudo correspondem ? an?lise de sensoriamento remoto e principalmente ? an?lise geom?trica e cinem?tica, da seq??ncia p?s-rifte da bacia. Al?m disso, o estudo teve como objetivo determinar os campos de tens?o que operam na ?rea. Os estudos foram realizados numa ?rea de 1.000 km?, localizada na por??o oeste da Bacia Potiguar, ao longo do Sistema de Falhas Po?o Verde-Cara?bas, estado do Rio Grande do Norte. As imagens de sensoriamento remoto indicam uma predomin?ncia de lineamentos orientados na dire??o NW-SE, consistente com o sistema de falha em estudo, seguido das dire??es NE-SW, N-S e E-W. As estruturas tect?nicas mapeadas foram analisadas somente em afloramentos da Forma??o Janda?ra. Eles s?o juntas (preenchidas ou n?o) em todas as dire??es com predomin?ncia para o trend NW-SE. Falhas normais de dire??o aproximada N-S, falhas transcorrentes nas dire??es NW-SE e NE-SW. A an?lise geodin?mica identificou dois campos de tens?es. O primeiro campo, Campo 1 , ? representado por uma compress?o N-S horizontal e distens?o E-W. Este campo atuou na Bacia Potiguar pelo menos at? o Mioceno. O segundo campo, Campo 2 ? representado por uma compress?o horizontal E-W e distens?o horizontal N-S. Este ? o atual campo de tens?es e tem afetado a Bacia Potiguar desde o Plioceno

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