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首页> 外文期刊>Fuel >Mineralogical compositions of Late Permian coals from the Yueliangtian mine, western Guizhou, China: Comparison to coals from eastern Yunnan, with an emphasis on the origin of the minerals
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Mineralogical compositions of Late Permian coals from the Yueliangtian mine, western Guizhou, China: Comparison to coals from eastern Yunnan, with an emphasis on the origin of the minerals

机译：贵州西部月两田矿区晚二叠世煤的矿物学组成：与云南东部煤的比较，重点是矿物的起源

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This paper reports the mineralogical characteristics of a complete coal seam in the Late Permian Longtan Formation from the Yueliangtian mine, western Guizhou, southwestern China. The minerals in the coal were identified using optical microscopy, scanning electron microscopy with an energy dispersive Xray spectrometer (SEM-EDS), and low temperature ashing plus X-ray diffraction (LTA + XRD). The results show that quartz and kaolinite are the major components of the coal mineral matter; followed by pyrite, marcasite, anatase, and calcite; and in some cases, mixed-layer illite/smectite, chamosite, illite, ankerite, apatite, and anorthite. The highly-elevated concentration of quartz in the coal is mostly derived from siliceous solutions produced by weathering of the Emeishan basalt. However, quartz discrete particles with large size (>100 mu m) and rounded shape probably resulted from the input of felsic rock materials. The distribution and modes of occurrence of kaolinite, mixed-layer illite/smectite, illite, and anatase reflect a terrigenous origin. In comparison with the coals from eastern Yunnan, the Yueliangtian coals have lower proportion of authigenic chamosite, the formation of which was probably related to the injection of seawater. Pyrite occurring as individual particles or clustered framboids was most likely influenced by seawater during the stages of peat accumulation or early diagenesis, while fracture-filling pyrite probably had an epigenetic origin. Additionally, an intra-seam volcanic ash-derived tonstein layer, which contains sharp-edged quartz, vermicular kaolinite, and well-developed zircon crystals, has been identified in the coal of the present study. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文报道了贵州西部的岳良田矿区晚二叠世龙潭组完整煤层的矿物学特征。使用光学显微镜，具有能量色散X射线光谱仪（SEM-EDS）的扫描电子显微镜以及低温灰化加X射线衍射（LTA + XRD）来鉴定煤中的矿物。结果表明，石英和高岭石是煤矿物质的主要成分。其次是黄铁矿，镁铁矿，锐钛矿和方解石；在某些情况下，还包括混合层伊利石/蒙脱石，硅铁矿，伊利石，铁矿石，磷灰石和钙长石。煤中石英含量的高度升高主要来自峨眉山玄武岩风化产生的硅质溶液。但是，长晶石（> 100微米）和圆形的石英离散颗粒可能是由于长英质岩石材料的输入而产生的。高岭石，层状伊利石/蒙脱石，伊利石和锐钛矿的分布和发生方式反映了陆源。与云南东部的煤相比，月良田煤的自生钨铁矿比例较低，其形成可能与注入海水有关。在泥炭堆积或早期成岩阶段，以单个颗粒或成簇的黄铁矿形式出现的黄铁矿最有可能受到海水的影响，而充满裂缝的黄铁矿可能起源于表观遗传。另外，在本研究的煤中，还发现了缝内火山灰衍生的吨石层，其中包含锋利的石英，蠕虫状的高岭石和发达的锆石晶体。 （C）2016 Elsevier Ltd.保留所有权利。

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