淮北煤田许疃煤矿煤岩及矿井水微量元素地球化学特征  

Geochemical Characteristics of Trace Elements in Coal Rock and Mine Water of Xutuan Coal Mine in Huaibei Coalfield

作　　者：马丽 何金先[2] 夏筱红[2] 岳鹏 李聚豪 黄正鑫 MA Li;HE Jinxian;XIA Xiaohong;YUE Peng;LI Juhao;HUANG Zhengxin(Shanxi Branch of China National Geological Exploration Center of Building Materials Industry,Taiyuan,Shanxi 030031;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116)

机构地区：[1]中国建筑材料工业地质勘查中心山西总队,山西太原030031 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国煤炭地质》2024年第12期62-69,共8页Coal Geology of China

基　　金：国家重点研发计划项目(2021YFC2902003)。

摘　　要：采集许疃煤矿采煤层3-2、7-2、8-2工作面的煤样共3个、岩样2个、夹矸样1个及水样2个,测试其中微量元素浓度,分析了所采集的煤岩、岩样及水样的元素含量情况,并探讨其沉积物源及沉积环境。结果表明:①微量元素更容易在无机岩样(煤)中富集形成矿物质;Mo在煤中含量较其他岩石样中高,认为Mo以与有机质缔合形式赋存在煤中。煤中微量元素含量变化趋势近乎一致,认为这3个煤层的沉积环境应该是近乎一致的。在煤层中可溶性的Ba、Ni、Mo含量均高,导致水中有较多的含量。煤中稀土元素主要赋存在无机矿物中,重稀土元素亲有机性强。②对比《地下水水质标准(DZ/T 0290—2015)》,在3-2煤老塘水、8-2煤顶板水中Ba、Ni、Mo含量均高。认为水中微量元素含量高,受到含煤地层的影响。③煤和夹矸中黏土矿富集Li,煤中黏土矿同时富集了V。Ga以与黏土矿物组合为主,可能存在与有机质结合的情况。④稀土元素w(La)/w(Yb)-w(REE)图解分析表明,研究区沉积物源岩性为陆源碎屑沉积,且为长英质。⑤通过锶钡比、球粒陨石标准化稀土模式、δEu、δCe分析,认为3-2煤、7-2煤和8-2煤均为陆相沉积,且为还原环境。Collect a total of 3 coal samples,2 rock samples,1 gangue sample,and 2 water samples from the 3-2,7-2,and 8-2 working faces of Xutuan Coal Mine.Test the concentration of trace elements,analyze the element content of the coal,rock,and water samples,and explore their sediment sources and sedimentary environments.The results indicate that:①Trace elements are more likely to accumulate and form minerals in inorganic rock samples(coal).The content of Mo in coal is higher than in other rock samples,indicating that Mo exists in coal in the form of association with organic matter.The trend of changes in trace element content in coal is almost consistent,and it is believed that the sedimentary environment of these three coal seams should be almost consistent.The high content of soluble Ba,Ni and Mo in coal seams leads to a higher content in water.Rare earth elements in coal are mainly present in inorganic minerals,and heavy rare earth elements have strong organic affinity.②Compared with the Groundwater Quality Standards(DZ/T 0290—2015),the Ba,Ni,and Mo contents in the goaf water of coal seam 3-2 and the roof water of coal seam 8-2 are all high.It is believed that the content of trace elements in water is high and influenced by coal bearing strata.③Clay minerals in coal and gangue are enriched with Li,while clay minerals in coal are also enriched with V.Ga is mainly associated with clay minerals and may be associated with organic matter.④The graphical analysis of rare earth elements w(La)/w(Yb)-w(REE)indicates that the sedimentary source rocks in the study area are terrigenous clastic sediments,and are felsic.⑤Based on the Sr/Ba Ratio,standardized rare earth patterns of chondrites,and analysis ofδEu andδCe,it is believed that 3-2 coal,7-2 coal,and 8-2 coal are all terrestrial sediments and in a reductive environment.

关 键 词：地球化学 微量元素 沉积物源 古环境 许疃煤矿 

分 类 号：P59[天文地球—地球化学]