Geochemical Anomalies of the Late Permian Coal in the Guishan Coalfield, Eastern Yunnan, China
Geochemical Anomalies of the Late Permian Coal in the Guishan Coalfield, Eastern Yunnan, China
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DOI：
10.3390/min13020195
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发表时间：
2023-01
期刊：
影响因子：
2.5
通讯作者：
Langtao Liu;Chao Jin;Beibei Zhang;Xiaogang Zhang;Jie Su;Ruixu Zhao;Shuaipo Gao
中科院分区：
文献类型：
--
作者：
Langtao Liu;Chao Jin;Beibei Zhang;Xiaogang Zhang;Jie Su;Ruixu Zhao;Shuaipo Gao
中国西南地区晚二叠世含煤岩系富集Sc、V、Co、Ni、Cu、Zn、Nb、Ta、Zr、Hf等关键元素。查明该区关键元素富集的条件和基础，对支持我国关键金属需求具有重要意义。对滇东晚二叠世龟山煤田煤样的元素组成进行了分析。结果表明，飞龙马矿C4上煤层和石棚矿C5 + 10煤层确实富含临界元素。过渡金属元素Sc、V、Co、Ni、Cu和Zn在两个煤层中的平均富集系数（CC）分别为3.23和2.93。高场强元素Nb、Ta、Zr和Hf以及不变价亲铜元素Ga和In的平均CC分别为2.21和2.53。飞龙马矿C4-上煤层可根据灰分含量的不同分为两段，两段煤中关键元素的碳含量基本相等。两煤层的主要矿物为高岭石、菱铁矿、石英、石膏、菱铁矿和白铁矿。多种物源指示表明，桂山煤田关键元素的富集受陆源碎屑物质控制。龟山煤田的物源为西北部的康滇古陆，其主要碎屑物质与峨眉山大火成岩省的高钛玄武岩有关。
The coal-bearing sequences of the Late Permian in southwest China are enriched in critical elements Sc, V, Co, Ni, Cu, Zn, Nb, Ta, Zr and Hf. Ascertaining the conditions and basis for the enrichment of critical elements in this area is very important to support the critical metal demands of China. In this study, we analyzed the concentrations of elemental compositions of coal samples collected from the Late Permian Guishan coalfield in the eastern Yunnan, China. The results show that the C4-Upper coal seam of the Feilongma mine and C5 + 10 coal seam of the Shipeng mine are indeed rich in critical elements. The average concentration coefficients (CC) of transition metal elements Sc, V, Co, Ni, Cu, and Zn are 3.23 and 2.93, respectively, in the two coal seams. The average CCs of high-field-strength elements Nb, Ta, Zr, and Hf and non-variable valence chalcophile elements Ga and In are 2.21 and 2.53, respectively, in the two coal seams. The C4-Upper coal seam of the Feilongma mine can be divided into two sections based on the different ash contents, and the CCs of the critical elements in the two sections are almost equal. The main minerals in the two coal seams are kaolinite, siderite, quartz, gypsum, rozenite and marcasite. Multiple indicators of provenance show that the enrichment of critical elements in the Guishan coalfield is controlled by clastic terrigenous material. The source area of the Guishan coalfield is Kangdian Oldland in the northwest, and the main clastic materials are related with high-Ti basalts from the Emeishan Large Igneous Province.