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首页> 外文期刊>Brazilian Journal of Geology >Stratigraphy, petrography and tectonics of the manganese-bearing Buritirama Formation, Northern Carajás Domain, Amazon Craton
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Stratigraphy, petrography and tectonics of the manganese-bearing Buritirama Formation, Northern Carajás Domain, Amazon Craton

机译：亚马逊克拉顿北部卡拉加斯地区的含锰Buritirama组的地层学，岩相学和构造学

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The Buritirama Formation (BF) occurs at the extreme north of the Carajás Province, close to the contact with the Bacajá domain, in the southeastern portion of the Amazon Craton (Brazil). The BF consists of a 40 km long, ca. 3 km wide NW-SE trending structure arranged in four imbricated thrusts that individualize three main stratigraphic units. The lower unit is composed of orthoquartzite followed by carbonate-silicate rocks. The intermediate unit hosts a supergene manganese ore deposit formed by weathering of kutnohorite-rich marble. -Quartzite/-mica-quartz schist followed by carbonate-silicate rocks make up the upper unit. The local basement is constituted by orthogneiss-migmatite (Xingu Complex) and the Buritirama metagranite. Mineral chemistry data and metamorphic textures record high consumption of carbonate and quartz to produce clinopyroxenes. The structural assemblage of the BF records mass transport from NE to SW and the following deformational phases: D1 (compressional ductile), D2 (compressional brittle) and D3 (extensional brittle). The BF is interpreted as part of a platformal depositional system positioned at the border of the Carajás domain, which was probably inverted, deformed and metamorphosed during the Transamazonian event (ca. 2.1 Ga), in a deformation belt related to the amalgamation between the Carajás and Bacajá domains.
机译：Buritirama组（BF）发生在Carajás省的最北部，靠近与亚马逊Craton（巴西）东南部的Bacajá域接触。高炉大约40公里长。 3 km宽的NW-SE趋势结构布置在四个倾斜的冲断层中，从而使三个主要地层单元个体化。下部单元由正石英岩和碳酸盐-硅酸盐岩组成。中间单元容纳由风化富含库特诺石的大理石形成的上成型锰矿床。 -石英岩/云母-石英片岩，然后是碳酸盐-硅酸盐岩，构成上部单元。当地的地下室是由正长片-蒙脱石（新谷复合体）和Buritirama变质花岗岩构成的。矿物化学数据和变质织构记录了碳酸盐和石英的大量消耗，以生产斜辉石。高炉的结构组合记录了从NE到SW的质量传输以及以下变形阶段：D1（压缩韧性），D2（压缩脆性）和D3（拉伸脆性）。高炉被解释为位于Carajás区域边界的平台性沉积系统的一部分，该平台沉积可能在Transamazonian事件（约2.1 Ga）期间在与Carajás合并有关的变形带中发生了反转，变形和变质。和Bacajá域名。

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