安徽淮南煤田煤系地层铝质泥岩的地球化学特征  

Geochemical Features of Coal Measures Strata Aluminous Mudstone in Huainan Coalfield,Anhui

作　　者：张蒜 陈健[1] 张博斐 沙吉顿 曾建 刘文中[1] 陈萍[1] 王兴明[1] 刘启蒙[1] 张平松[1] Zhang Suan;Chen Jian;Zhang Bofei;Sha Jidun;Zeng Jian;Liu Wenzhong;Chen Ping;Wang Xingming;Liu Qimeng;Zhang Pingsong(School of Earth and Environment,Anhui University of Science and Technology,Huainan,Anhui 232001)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001

出　　处：《中国煤炭地质》2020年第8期20-25,47,共7页Coal Geology of China

基　　金：安徽省杰出青年科学基金(1908085J14);国家自然科学基金(41972173、41402139);国家重点研发计划课题(2016YFC0201605);国家重点基础研究发展计划课题(2014CB238901)。

摘　　要：为研究淮南煤田煤系地层铝质泥岩的地球化学特征,揭示其地质成因,并评价其资源价值,从顾桥矿勘探钻孔中共收集了4个4煤层下伏铝质泥岩样品,分别采用XRD、XRF、ICP-MS对其矿物组成、主量和微量元素进行了分析测试。结果表明:淮南煤田4煤下伏铝质泥岩中矿物主要包括高岭石和菱铁矿,含量少量石英和片钠铝石。与上陆壳元素背景值相比,Al2 O3、Fe2 O3和TiO2富集,SiO2和碱金属氧化物亏损;Ag极强烈富集,Cd强烈富集,Li、B、Cr、Ni、Ge、Zr、In、Hf和Bi富集,Sc、V、Zn、Ga、Sn、W和Pb元素含量正常,稀土元素和其余元素亏损。Ga和B含量、Al2 O3/TiO2、Sr/Ba、Zr/Hf和δCe等地化指标表明该铝质泥岩为淡水影响的弱酸-弱碱陆相沉积环境的产物,其源岩为酸性岩石。该铝质泥岩适合生产一般耐火黏土,其中伴生稀有元素Ga具有开发利用前景。To study coal measures strata aluminous mudstone geochemical features in the Huainan coalfield,reveal its geological genesis and assess resource values have collected 4 samples from coal No.4 underlying aluminous mudstone,then using XRD,XRF and ICPMS means carried out analysis and test for mineral composition,macroelements and microelements.The results have shown that mineral composition of coal No.4 underlying aluminous mudstone included mainly kaolinite and siderite,a small quantity of quartz and dawsonite.Compared with upper continental crust element background values,Al2O3,Fe2O3 and TiO2 enriched,SiO2 and alkali metal oxides deficient,Ag very strongly enriched,Cd strongly enriched,Li,B,Cr,Ni,Ge,Zr,In,Hf and Bi enriched,Sc,V,Zn,Ga,Sn,W and Pb contents normal,REE and other elements deficient.Ga and B contents,Al2O3/TiO2,Sr/Ba,Zr/Hf and δ Ce etc geochemical indicators have indicated that aluminous mudstone is a product of freshwater impacted weak acid-weak base terrestrial sedimentary environment;the source rock is acid rock.The aluminous mudstone is propitious to general refractory clay production.The associated element Ga has exploitation and utilization prospect.

关 键 词：稀土元素 微量元素 铝质泥岩 煤系地层 淮南煤田 

分 类 号：P595[天文地球—地球化学]