Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/4109
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Type: Artigo de Periódico
Issue Date: Sep-2002
Authors: COSTA, João Batista Sena
HASUI, Yociteru
BEMERGUY, Ruth Léa
SOARES JUNIOR, Adilson Viana
VILLEGAS, Javier M. Cahuana
Title: Tectonics and paleogeography of the Marajó Basin, northern Brazil
Citation: COSTA, JOÃO B. S., et al. Tectonics and paleogeography of the Marajó Basin, northern Brazil. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 74, n. 3, p. 519-531, set. 2002. Disponível em: <http://www.scielo.br/pdf/aabc/v74n3/v74n3a13.pdf>. Acesso em: 12 ago. 2013. <http://dx.doi.org/10.1590/S0001-37652002000300013>.
Abstract: The Marajó Basin area presents geologic and geomorphologic features chiefly due to the Mesozoic extension and post-Miocene neotectonics. The extension event with an Early and a Late Cretaceous phases originated four sub-basins that constitutes the Marajó Basin, with a thick continental clastic sequence showing marine influence. NW and NNW normal faults and NE and ENE strike-slip faults controlled the basin geometry. The extension, related to the Equatorial Atlantic opening, propagated into the continent along crustal weakness zones of the Precambrian Tumucumaque, Amapá and Araguaia orogenic belts. The neotectonic event is a strike-slip regime which developed transtensional basins filled in by Upper Tertiary shallow marine (Pirabas Formation) and transitional sequences (Barreiras Group), followed by Quaternary fluvial deposits and transitional sequences derived from the Amazon and Tocantins rivers and the Marajoara estuary. The current landscape has a typical estuarine morphology. The coast morphology presents sea-cliffs on transitional Upper Tertiary sequences, while inwards dominate hills sustained by Mid-Pleistocene lateritic crust, with a flat erosive surface at 70 m. In the eastern Marajó Island several generations of paleochannels associated with fluvial-estuarine sequences are recognized, while a fluvial-marine plain is widespread on its western side.
Keywords: Paleogeografia
Geomorfologia
Estrutura (Geologia)
Evolução
Bacia do Marajó (PA)
ISSN: 0001-3765
Appears in Collections:Artigos Científicos - IG

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