Composition and mode of occurrence of minerals in Late Permian coals from Zhenxiong County, northeastern Yunnan, China
Composition and mode of occurrence of minerals in Late Permian coals from Zhenxiong County, northeastern Yunnan, China
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滇东北镇雄县晚二叠世煤矿物组成及赋存模式
DOI：
10.1007/s40789-014-0007-4
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发表时间：
2014-09
影响因子：
8.3
通讯作者：
Lixin Zhao
中科院分区：
文献类型：
--
作者：
Jianhua Zou;Sen Zhang;Heming Tian;Lixin Zhao
采用光学显微镜和低温灰化X射线衍射（LTA + XRD）技术对云南镇雄县牛场-依古矿区晚二叠世煤中的矿物进行了研究。结果表明，煤中的矿物主要是石英，高岭石，绿泥石，混合层伊/蒙皂石（I/S），黄铁矿，方解石，与微量的白铁矿，白云石，白云母。自生石英一般产于胶凝碎屑岩中，或充填于割理或细胞腔中。这种二氧化硅主要来自康滇高地玄武岩风化产生的水溶液和热液流体。在硬铬榴石中发现β-石英副晶颗粒，可能表明这些颗粒是碎屑，来自火山灰。粘土矿物通常嵌入在胶凝石中，并作为细胞填充物出现。硫铁矿以框架状、无定形和自形颗粒以及细胞填充物的形式存在。煤中黄铁矿含量高，可能是泥炭堆积阶段海水侵入的结果。方解石通常以脉充填物的形式出现，表明其为后生成因。
Minerals in the Late Permian coals from the Niuchang-Yigu mining area, Zhenxiong County, northeastern Yunnan, China, were investigated using optical microscopy and low temperature ashing plus X-ray diffraction (LTA + XRD). The results showed that minerals in the coal LTAs are mainly quartz, kaolinite, chamosite, mixed-layer illite/smectite (I/S), pyrite, and calcite, with trace amounts of marcasite, dolomite, and bassanite. The authigenic quartz generally occurs in collodetrinite or as a filling in cleats or cell cavities. This silica was mainly derived from aqueous solutions produced by the weathering of basaltic rocks in the Kangdian Upland and from hydrothermal fluids. The presence of β-quartz paramorph grains in collodetrinite probably indicates that these grains were detrital and came from a volcanic ash. Clay minerals are generally embedded in collodetrinite and occur as cell-fillings. Pyrite occurs as framboidal, anhedral, and euhedral grains and a cell-filling. The coals are high in pyrite and the high pyrite content probably results from seawater invading during the stage of peat accumulation. Calcite generally occurs as vein-fillings, indicating an epigenetic origin.
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影响因子：
5.6
作者：
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通讯作者：
Yiping Zhou;B. Bohor;Youliang Ren
影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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影响因子：
5.6
作者：
Dai, Shifeng;Zhang, Weiguo;Zhou, Dao
通讯作者：
Zhou, Dao