Tectonics and paleogeography of the Marajó Basin, northern Brazil

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Main Author:	João B. S. Costa
Format:	Artículo científico
Language:	en
Published:	Academia Brasileira de Ciências 2002
Subjects:	Multidisciplinaria (Ciencias Naturales y Exactas) structure evolution Marajó Basin geomorphology paleogeography
Online Access:	Acceder al recurso
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author	João B. S. Costa
author_facet	João B. S. Costa
contents	Tectonics and paleogeography of the Marajó Basin, northern Brazil João B. S. Costa Yociteru Hasui Ruth I. Bemerguy Adilson V. Soares Javier M. C. Villegas Multidisciplinaria (Ciencias Naturales y Exactas) structure evolution Marajó Basin geomorphology paleogeography The Marajó Basin area presents geologic and geomorphologic features chiefly due to the Mesozoic extensionand post-Miocene neotectonics. The extension event with an Early and a Late Cretaceous phases originatedfour sub-basins that constitutes the Marajó Basin, with a thick continental clastic sequence showing marineinfluence. NWandNNWnormal faults and NE and ENE strike-slip faults controlled the basin geometry. Theextension, related to the Equatorial Atlantic opening, propagated into the continent along crustal weaknesszones of the Precambrian Tumucumaque, Amapá and Araguaia orogenic belts. The neotectonic event is astrike-slip regime which developed transtensional basins filled in by Upper Tertiary shallow marine (PirabasFormation) and transitional sequences (Barreiras Group), followed by Quaternary fluvial deposits and transitionalsequences derived from the Amazon and Tocantins rivers and the Marajoara estuary. The currentlandscape has a typical estuarine morphology. The coast morphology presents sea-cliffs on transitional UpperTertiary sequences, while inwards dominate hills sustained by Mid-Pleistocene lateritic crust, with a flaterosive surface at 70 m. In the eastern Marajó Island several generations of paleochannels associated withfluvial-estuarine sequences are recognized, while a fluvial-marine plain is widespread on its western side. 2002 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32774313 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.74
format	Artículo científico
id	redalyc_32774313
language	en
publishDate	2002
publisher	Academia Brasileira de Ciências
spellingShingle	Tectonics and paleogeography of the Marajó Basin, northern Brazil João B. S. Costa Multidisciplinaria (Ciencias Naturales y Exactas) structure evolution Marajó Basin geomorphology paleogeography Tectonics and paleogeography of the Marajó Basin, northern Brazil João B. S. Costa Yociteru Hasui Ruth I. Bemerguy Adilson V. Soares Javier M. C. Villegas Multidisciplinaria (Ciencias Naturales y Exactas) structure evolution Marajó Basin geomorphology paleogeography The Marajó Basin area presents geologic and geomorphologic features chiefly due to the Mesozoic extensionand post-Miocene neotectonics. The extension event with an Early and a Late Cretaceous phases originatedfour sub-basins that constitutes the Marajó Basin, with a thick continental clastic sequence showing marineinfluence. NWandNNWnormal faults and NE and ENE strike-slip faults controlled the basin geometry. Theextension, related to the Equatorial Atlantic opening, propagated into the continent along crustal weaknesszones of the Precambrian Tumucumaque, Amapá and Araguaia orogenic belts. The neotectonic event is astrike-slip regime which developed transtensional basins filled in by Upper Tertiary shallow marine (PirabasFormation) and transitional sequences (Barreiras Group), followed by Quaternary fluvial deposits and transitionalsequences derived from the Amazon and Tocantins rivers and the Marajoara estuary. The currentlandscape has a typical estuarine morphology. The coast morphology presents sea-cliffs on transitional UpperTertiary sequences, while inwards dominate hills sustained by Mid-Pleistocene lateritic crust, with a flaterosive surface at 70 m. In the eastern Marajó Island several generations of paleochannels associated withfluvial-estuarine sequences are recognized, while a fluvial-marine plain is widespread on its western side. 2002 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32774313 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.74
title	Tectonics and paleogeography of the Marajó Basin, northern Brazil
topic	Multidisciplinaria (Ciencias Naturales y Exactas) structure evolution Marajó Basin geomorphology paleogeography
url	https://www.redalyc.org/articulo.oa?id=32774313

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