NEOTECTÔNICA DA REGIÃO AMAZÔNICA: ASPECTOS TECTÔNICOS, GEOMORFOLÓGICOS E DEPOSICIONAIS

Auteurs

  • João Batista Sena Costa Centro de Geociências, Universidade Federal do Pará.
  • Ruth Léa Bemerguy Centro de Geociências, Universidade Federal do Pará.
  • Yociteru Hasui Pesquisador do CNPq
  • Maurício da Silva Borges Centro de Geociências, Universidade Federal do Pará.
  • Carlos Roberto Paranhos Ferreira Júnior Curso de Pós-Graduação em Geologia, Centro de Geociências, Universidade Federal do Pará.
  • Pedro Édson Leal Bezerra Fundação Instituto Brasileiro de Geografia e Estatística, Belém.
  • Marcondes Lima da Costa Centro de Geociências, Universidade Federal do Pará.
  • Jane Maria Garrafielo Fernandes Centro de Geociências, Universidade Federal do Pará.

DOI :

https://doi.org/10.18285/geonomos.v4i2.199

Résumé

Several types of structures are observed in the Precambrian, Mesozoic and Cenozoic rocks of theAmazon region, which represent the major features of the neotectonic framework developed since theMiocene. They controlled the sediment deposition of the Upper Tertiary and Quaternary, as well as haveinfluenced the development of the present landform patterns and drainage systems. Transpressive andtranstensive areas are recognized based on their nature and geometry, and related to two main episodes oftranscurrent displacement of Miocene/Pliocene and Upper Pleistocene /Recent ages. Sets of E-W, ENEWSWand NE-SW right-hand strike-slip faults are present in most of these areas. These sets are linked bynormal faults trending NW-SE and NNW-SSE, or by thrust faults trendig NE-SW and ENE-WSW,depending upon their geometry. Large areas with N-S trending younger normal faults are also observed.Earthquakes, the phenomenon of “fallen lands”, fluvial channels migration, hot springs, etc., are related toareas where some of these faults remain active. All these structures are related to an intraplate E-W righthandshear system induced by the rotation of South American Plate towards west.

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Publiée

1996-12-01

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