Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar basin, Xinjiang province, China
Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar basin, Xinjiang province, China
复制标题
新疆准噶尔盆地准东大煤田煤炭地球化学与矿物学
DOI：
10.1016/j.coal.2009.12.015
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发表时间：
2010-05-01
影响因子：
5.6
通讯作者：
Li, Jinghong
中科院分区：
文献类型：
--
作者：
Zhou, Jibin;Zhuang, Xinguo;Li, Jinghong
准东煤田是目前正在勘探的特大型煤炭存款，有望成为中国西部重要的煤炭资源。西黑山和五彩湾的含煤单元为八道湾组（下侏罗统），特别是西山窑组（中侏罗统）。这些煤层包括1 - 31层煤层（1 - 10层可采煤达到高挥发性A级烟煤），可采煤累积厚度为20-87 m。这些最近勘探的煤炭储量质量高，其特点是灰分、铝、铁、硫和微量元素含量低。这种煤中的矿物主要是石英、高岭石、菱铁矿和黄铁矿。西黑山煤和五彩湾煤中的微量元素含量远低于中国煤中常见的浓度范围，但Ba和Sr除外。因此，西黑山煤中的Ba含量高于Swaine的全球浓度范围。大量元素以铝硅酸盐亲合力为主，赋存于粘土等碎屑煤矿物中。五柴湾煤中Ca、Mn以碳酸盐亲合为主，Fe、S以硫化物亲合为主。在西黑山，Fe、Mn、Mg主要为碳酸盐亲合力（菱铁矿），而B、Co、Ni、S可能为有机亲合力，因此准东煤田的煤具有很高的质量和很低的杂质含量。非常低的灰分产量，S，Fe和微量元素含量可能是由于沉积环境，在一个非常浅的湖泊环境中，低碎屑供应与密集的泥炭沼泽沉积。西黑山煤中硫含量极低、钡硫酸盐（重晶石）含量相对较高、菱铁矿产率较高（与五彩湾煤中黄铁矿产率相反），这可能是由于泥炭的快速沉积，导致矿物、元素的氧化和淋溶，以及有机组分的降解。在这种情况下，硫酸盐被连续沉淀和硫酸钡（可溶性极低）积累所捕获。(C)2010 Elsevier B. V.保留所有权利。
The Zhundong coalfield is a very large coal deposit, currently under exploration, and promises to be an important coal mining resource in Western China. The coal reserves amount to 164 Gt. At Xiheishan and Wucaiwan, the coal-bearing units are the Badaowan (Lower Jurassic) and, especially, the Xishanyao formations (Middle Jurassic). These contain from one to 31 coal seams (one to 10 workable coals reaching the rank of high volatile A bituminous) with an accumulated workable coal thickness of 20-87 m. These recently explored coal reserves are of a high quality and are characterized by low ash, aluminum, iron, sulfur, and trace element contents. The minerals present in this coal are mainly quartz, kaolinite, siderite, and pyrite. The trace element contents in both Xiheishan and Wucaiwan coals are much lower when compared with the usual concentration ranges present in Chinese coals, with the exception of Ba and Sr. Thus, Ba contents in Xiheishan coal are higher than Swaine's worldwide concentration range. A large number of elements have mainly aluminosilicate affinity, and occur in clay and other detrital coal minerals. Ca and Mn have mainly carbonate affinity: Fe and S have mainly sulphide affinity in Wuchaiwan coal. In Xiheishan, Fe, Mn and Mg have mainly carbonate affinity (siderite), and probably, B, Co, Ni and S have an organic affinity.Thus, the Zhundong coalfield contains coal with a very high quality and very low levels of impurities. The very low ash yields, S, Fe, and trace element contents may be attributed to the sedimentological setting, with intensive peat bog aggradation in a very shallow lake environment with a low detrital supply. The very low sulfur content, the relatively high Ba-sulfate (barite) content and the high siderite occurrence in Xiheishan coal (in contrast to the pyrite occurrence in Wucaiwan coal) may be attributed to the rapid aggradation of peat with the consequent oxidation and leaching of minerals, elements, and degradation of organic components. Under this scenario, sulfate is trapped by the continuous precipitation and accumulation of barium sulfate (very low soluble). (C) 2010 Elsevier B.V. All rights reserved.