Revisão Estratigráfica da Bacia dos Parecis - Amazônia.
Revisão Estratigráfica da Bacia dos Parecis - Amazônia.
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Revisão Estratigráfica da Bacia dos Parecis - 亚马逊。
DOI：
10.5327/rbg.v36i4.1252
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发表时间：
2006
影响因子：
1.4
通讯作者：
A. J. Pedreira
中科院分区：
文献类型：
--
作者：
Ruy Benedito Calliari Bahia;Marcelo A. Martins;Maria Sílvia Carvalho Barbosa;A. J. Pedreira
帕雷西斯盆地位于巴西中西部，亚马逊克拉通西南部，朗多尼亚褶皱带和瓜波雷褶皱带之间。从西向东，帕雷西斯盆地可分为三个构造沉积域：西部的构造低洼区、以负重力异常为特征的中央区和东部的内凹陷。古生代（奥陶纪至早二叠纪）期间，亚马逊地区受到拉张事件的影响，Cacoal、Furnas、Ponta Grossa、Pimenta Bueno eFazenda da Casa Branca 地层沉积在 Parecis 盆地。煤层由砾岩、砂岩、页岩和白云岩组成，解释为沉积在冲积扇、三角洲和湖泊中。 Furnas 和 Ponta Grossa 地层的卵石砂岩和页岩被解释为分别沉积在潮滩和海洋环境中。对于 Pimenta Bueno 和 Fazenda da Casa Branca 地层的砾岩、砂岩和页岩，建议存在冰川或受冰川影响的环境。帕雷西斯盆地的沉积记录显示出二叠纪至三叠纪的地层间隙。中生代火山和沉积岩序列记录了亚马逊地区的另一次伸展事件。这一事件在 Parecis 盆地中以侏罗纪 Rio Avila 地层的风成砂岩以及 Anari 和 Tapirapua 地层的玄武岩为代表。Parecis 群的砂岩是在白垩纪的河流和风成环境中沉积的。白垩纪金伯利岩体切割了帕雷西斯盆地东北部和东南部的沉积物。新生代砂岩和泥岩不整合地覆盖帕雷西斯盆地的沉积物。
The Parecis basin is located in central-western Brazil, on the southwestern part of the Amazon Craton, between the Rondonia and Guapore fold belts. From west to east, the Parecis basin can be divided into three tectono-sedimentary domains: a tectonic low to the west, a central compartment characterized by a negative gravimetric anomaly, and a interior sag to the east. During the Paleozoic (Ordovician to Early Permian), the Amazon region was affected by an extensional event, when the Cacoal, Furnas, Ponta Grossa, Pimenta Bueno eFazenda da Casa Branca formations were deposited in the Parecis basin. The Coacal Formation is composed of conglomerates, wackes, shales and dolomites, interpreted as deposited in alluvial fans, deltas and lakes. The pebbly sandstones and shales of the Furnas and Ponta Grossa formations are interpreted as deposited, respectively, in tidal flats and marine environments. Glacial or glacial-influenced environments are suggested for the conglomerates, sandstones and shales of the Pimenta Bueno and Fazenda da Casa Branca formations. The sedimentary record of Parecis basin shows a stratigraphic gap from Permian to Triassic. Mesozoic volcanic and sedimentary successions record another extensional event in the Amazon region. This event is represented in the Parecis basin by the eolian sandstones of the Jurassic Rio Avila Formation and the basalts of the Anari and Tapirapua formations.The sandstones of the Parecis Group have been deposited during the Cretaceous in fluvial and eolian environments. Cretaceous kimberlite bodies cut the sediments in the northeastern and southeastern parts of the Parecis basin. Cenozoic sandstones and mudstones cover unconformably the deposits of the Parecis basin.