Abstract
This paper reports the mineralogical compositions of super-low-sulfur (Yueliangtian 6-upper (YLT6U)) and high-sulfur (Yueliangtian 6-lower (YLT6L)) coals of the Late Permian No. 6 coal seam from the Yueliangtian coal mine, Guizhou, southwestern China. The mineral assemblages and morphology were detected and observed by X-ray diffractogram (XRD), optical microscopy and field-emission scanning electron microscope (FE-SEM) in conjunction with an energy-dispersive X-ray spectrometer. Major minerals in the coal samples, partings and host rocks (roof and floor strata) include calcite, quartz, kaolinite, mixed-layer illite/smectite, chlorite and pyrite and, to a lesser extent, chamosite, anatase and apatite. The Emeishan basalt and silicic rocks in the Kangdian Upland are the sediment source for the Yueliangtian coals. It was found that there are several modes of chamosite occurrence, and precursor minerals, such as anatase, had been corroded by Ti-rich hydrothermal solutions. The modes of occurrence of minerals present in the coal were controlled by the injection of different types of hydrothermal fluids during different deposition stages. The presence of abundant pyrite and extremely high total sulfur contents in the YLT6L coal are in sharp contrast to those in the YLT6U coal, suggesting that seawater invaded the peat swamp of the YLT6L coal and terminated at the YLT6U-9p sampling interval. High-temperature quartz, vermicular kaolinite and chloritized biotite were observed in the partings and roof strata. The three partings and floor strata of the No. 6 coal seam from the Yueliangtian coal mine appear to have been derived from felsic volcanic ash. Four factors, including sediment-source region, multi-stage injections of hydrothermal fluids, seawater influence and volcanic ash input, were responsible for the mineralogical characteristics of the Yueliangtian coals.
Highlights
Guizhou province in southwestern (SW) China contains abundant coal resources
Permian coals from western Guizhou province have attracted much attention [1,2,3,4,5], because of the coal-hosted rare-metal ore deposits found in this area [6,7,8], and due to their mineralogical and geochemical indications for the reginal geology evolution, such as the mantle plume formation located to the west of the coal basin [1,3]
Panxian county is closely located to the high-incidence area of the endemic arsenosis and fluorosis in SW China, the relation between mineralogical compositions of the coals in this area and the endemic disease occurring in the surrounding areas is unknown
Summary
Guizhou province in southwestern (SW) China contains abundant coal resources. The Late. Panxian county of southwestern Guizhou province have been reported by a few researchers [4,5], Tectonically, the Yueliangtian deposit belongs to a monocline structure with an approximate east geochemical characteristics, modes of mineral occurrence and their controlling geological factors dip [6]. It is limited by well-developed normal faults within the epsilon-type structure in the Puan in these coals, have not been well addressed.
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