Neotectônica Da Região Amazônica: Aspectos Tectônicos, Geomorfológicos E Deposicionais

Abstract

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.

Tectonics and paleogeography of the Marajó Basin, northern Brazil

“…The upper part of the Marajó Formation is correlated to the Pirabas Formation, a shallow water marine sequence, and Barreiras Group, a transitional one, and have been interpreted as linked to the neotectonics, as well as the Quaternary deposits (Tucunaré Formation; Costa et al 1996).…”

Análise multitemporal do sistema fluvial Solimões-Amazonas entre os tributários Purus e Negro, Amazônia Ocidental, Brasil

“…Outros estudos (Fredsoe, 1978;Crosato e Mosselman, 2009;Petrovszki et al, 2012) relacionam esta mudança à declividade, velocidade, largura e profundidade dos canais. Parte do padrão de drenagem do sistema fluvial Solimões-Amazonas está condicionada a lineamentos tectônicos e falhas, com direções preferenciais N-S, E-W, ENE-WSW, NE-SW e NW-SE, descritos em diversos estudos (Sternberg, 1950;Franzinelli e Latrubesse, 1993;Costa et al, 1996;Bemerguy, 1997;Franzinelli e Igreja, 1990;Igreja et al, 1990;Igreja, 1999;Gonzaga et al, 2000;Latrubesse e Franzinelli, 2002;Riccomini et al, 2012;Silva et al, 2007;Ibanez et al, 2014, entre outros). Este sistema fluvial, na confluência com o rio Purus, apresenta uma tendência NE-SW que se estende por cerca de 75 km, mudando abruptamente para a direção E-W, e posteriormente para ENE-WSW, na confluência com o rio Manacapuru, onde se estende por cerca de 40 km, passando novamente para a direção NE-SW até a confluência com o rio Negro, em Manaus (Igreja et al, 1990;Franzinelli e Latrubesse, 1993;Latrubesse e Franzinelli, 2002) (Figura 2).…”

Erratum to: Neogene eastern Amazon carbonate platform and the paleoenvironmental interpretation

“…Therefore, Rossetti (2001) proposed that the reactivation of normal and strike-slip faults from Precambrian basement, combined with sea-level changes, was responsible for the genesis of these units in the deep tectonic troughs (e.g., Vigia-Castanhal and Marajó basins). The Neotectonic activity of the northeastern Pará is controlled by E-W transcurrent faults connected with NW-SE normal faults, while the structural and sedimentary evolution is related to the reactivation of the basement architecture (Costa et al 1996). Structural entities such as the Pará platform and Bragança-Viseu basin are shown in Fig.…”