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首页> 外文期刊>Brazilian Journal of Geology >Structural framework of rocks of the Lagoa D'anta mine area, iron-manganese Urandi-Caetité-Licínio de Almeida District, Bahia, Brasil
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Structural framework of rocks of the Lagoa D'anta mine area, iron-manganese Urandi-Caetité-Licínio de Almeida District, Bahia, Brasil

机译：巴西巴伊亚州Lagoa D'anta矿区的岩石结构框架，铁锰Urandi-Caetité-Licíniode Almeida区

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The Urandi-Caetité-Licínio de Almeida Iron-Manganese District encompasses a total of 35 manganese mines, most of which are already exhausted, and 1 currently active iron mine. The host rocks of these ores are associated with the Paleoproterozoic Caetité-Licínio de Almeida Metavolcanossedimentary Sequence. These units have been deformed by the northern Serra do Espinha?o Thrust and Fold Belt, in the northern section of the Ara?uaí Orogen. Interbeddings of itabirite, cummingtonite schist, calcite and manganese-dolomitic marbles, calc-silicate and carbonate-silicate rocks, and amphibolitic metabasalt were found at the Lagoa D'anta mine, in addition to quartz-jacobsite schist, residual manganese-rich soil and manganese lateritic breccia. The main structural framework presents a general NE-SW trend and it consists predominantly of compressional structures. This structural framework is associated with the evolution of two Ediacaran dextral transpressional shear zones, the Carrapato zone, in the western portion, and S?o Timóteo zone, in the eastern portion. The structural framework of the Lagoa D'anta mine reflects a higher degree of shortening in the southern sector of the northern Serra do Espinha?o Thrust and Fold Belt, in the northern area of the Ara?uaí Orogen. The ductile structures related to these deformational phases were nucleated under conditions of progressive metamorphism with minimum temperature of 550°C. Stockwork structures of quartz, calcite, epidote, grunerite and magnetite truncate the mine's ductile structures. Fractures were the main circulation channels for meteoric water, which culminated in the formation of a high-content supergene ore in the mine.
机译：Urandi-Caetité-Licíniode Almeida铁锰区共有35座锰矿，其中大部分已经用尽，目前还有1座活跃的铁矿。这些矿石的主岩与古元古代Caetité-Licíniode Almeida的变火山沉积序列有关。这些单元已经因阿拉奥伊造山带北部的Serra do Espinha？o冲断带和褶皱带而变形。在Lagoa D'anta矿中发现了依他辉岩，cumumingtonite片岩，方解石和锰白云岩大理石，方解石和碳酸盐-硅酸盐岩以及两性偏玄武岩的层合物，此外还发现了石英-jacobsite片岩，残留的富锰土壤和锰红土角砾岩。主要的结构框架呈现出一般的NE-SW趋势，并且主要由压缩结构组成。该结构框架与两个Ediacaran右旋压变剪切带的演化有关，西部为Carrapato带，东部为S？oTimóteo带。 Lagoa D'anta矿的结构框架反映了阿拉瓦伊造山带北部Serra do Espinha？o推力和褶皱带北部的南部地区缩短程度更高。与这些变形相有关的韧性结构在渐进变质的条件下成核，最低温度为550°C。石英，方解石，橄榄石，褐铁矿和磁铁矿的库存结构截断了矿山的韧性结构。裂缝是流水的主要循环通道，最终导致矿山中高含量表生矿石的形成。

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