山西古交矿区含煤岩系泥岩地球化学特征及地质意义

Geochemical Characteristics and Geological Significance of the Mudstone of the Coal Bearing Rock Series in the Gujiao Mining Area of Shanxi Province

古交矿区富有丰富的煤炭资源,查明该区域含煤岩系元素参数、沉积环境、沉积物的来源等,不仅可以为研究地质运动发展提供资料,同时也能保障煤矿的安全开采.针对古交矿区含煤岩系中泥岩的样品进行化学检测,研究表明:研究区微量元素中高场强元素及亲石元素含量较上地壳中含量高,而亲铁和亲铜元素与上地壳中含量接近,在稀土元素方面出现轻稀土元素较富集而重稀土元素亏损的现象.根据Sr/Cu、V/(V+Ni)等指标可以判断研究区当时气候干热,整体沉积环境表现为还原厌氧环境中的海陆过渡相沉积,且形成泥岩的物源以碎屑沉积物为主,同时发现山西组还含有一些花岗岩物质,由此推测含煤岩系的物源区应该处于活动大陆边缘及海陆接触处.

Gujiao coal mining area is rich in coal resources.To identify the element parameters,sedimentary environment and source of sediments in this area,not only can provide information for studying the development of geological movement,but also guarantee the safe mining of coal mines.According to the Gujiao mining area coal bearing strata in the mudstone samples for chemical detection,the research showed that the high field strength elements and trace elements in the study area and lithophile elements content than the content in the upper crust,and close to the pro content of iron and chalcophile elements and light rare earth elements in the crust,and are enriched in hree phenomenon in the rare earth elements.According to Sr/Cu,V/(V+Ni)and other indicators can be judged at the time of dry climate,the overall performance of the transitional sedimentary environment reducing anaerobic environment in sedimentary facies,and the formation of mudstone source in clastic sediments,also found that the Shanxi group also contains some granite material,which indicated that the provenance of coal the Department should be in the active continental margin and continental contact.