贵州小牛井田煤的地球化学特征及古海平面变化

发布时间：2019-02-14 17:43

【摘要】：基于贵州水城小牛井田晚二叠世煤样的全硫分、微量元素、常量元素等测试数据,探讨了煤中元素富集特征及其与陆源碎屑的关系,重点是全硫分、微量元素对古海平面变化的反演。结果表明,小牛井田煤中常量元素Si、Ca、Mg、Ti、K含量高于中国煤均值,Al、Fe、Na含量低于中国煤均值;与地壳克拉克值相比,煤中微量元素只有B和Mo相对富集;煤中微量元素的富集在一定程度上受控于陆源碎屑,常量元素对陆源碎屑也有一定的继承性。煤中全硫分及微量元素B、Co、Cr、Cu、Ga、Ge、Mo、Ni、Pb、Sr、V、Zn的纵向变化规律可以用来反演古海平面变化,海退时形成的煤层全硫分及微量元素含量较低,海侵时形成的煤层全硫分及微量元素含量较高。
[Abstract]:Based on the test data of total sulfur, trace elements and constant elements in coal samples of late Permian in Shuicheng, Guizhou Province, the characteristics of element enrichment in coal and its relationship with terrestrial clastic materials are discussed, with emphasis on total sulfur content. The inversion of trace elements to paleo sea level change. The results show that the content of Si,Ca,Mg,Ti,K in coal of Xiaoniu mine field is higher than the average value of coal in China, the content of Al,Fe,Na is lower than the average value of coal in China, and compared with the Clarke value of crust, the trace elements in coal are relatively enriched in B and Mo. The enrichment of trace elements in coal is controlled by terrestrial clastic to some extent, and the major elements also have certain inheritance to terrestrial clastic. The longitudinal variation law of total sulfur and trace element B _ (CoCoC _ (Cr) C _ (C) Cu ~ (2 +) ~ (2 +) ~ (2 +) Zn in coal can be used to invert the paleo sea level change, and the content of total sulfur and trace elements in the coal seam formed during the regression is relatively low. The content of total sulfur and trace elements in seams formed during transgression is higher.
【作者单位】：贵州大学资源与环境工程学院;贵州大学矿业学院;
【基金】：贵州大学重点学科建设项目(GU002) 贵州省国土资源厅公益性、基础性基金项目(黔国土资发[2015]34号)~~
【分类号】：P618.11

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