贵州织金县大明矿区龙潭组煤中元素地球化学特征及其沉积环境指示意义

龙宇; 罗顺社; 吕奇奇

龙宇,罗顺社,吕奇奇.贵州织金县大明矿区龙潭组煤中元素地球化学特征及其沉积环境指示意义[J].贵州地质,2022,39(2):108-114

贵州织金县大明矿区龙潭组煤中元素地球化学特征及其沉积环境指示意义

Environment Indicating Significance in Coal of Longtan Formation in Daming Mining Area of Zhijin County in Guizhou

投稿时间：2022-01-21

DOI：

中文关键词: 大明矿区龙潭组沉积环境常量元素微量元素贵州

英文关键词:Daming mining area Longtan Formation Sedimentary environment Constant element Trace elements Guizhou

基金项目:

作者	单位
龙宇	贵州煤矿地质工程咨询与地质环境监测中心，贵州贵阳，550006
罗顺社	长江大学非常规油气湖北省协同创新中心，湖北武汉，430100
吕奇奇	长江大学地球科学学院，湖北武汉，430100

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中文摘要:

为研究煤炭中地球化学元素特征与沉积环境的关系，通过对研究区大明矿区龙潭组钻孔煤样的分析测试，总结了煤炭地球化学元素特征，并探讨了常量元素、微量元素特征与沉积环境之间的关系，研究表明:Al2O3、TiO₂、K2O、S均为陆源元素，煤中的S元素主要以无机硫的形式富集；CaO、MgO、MnO₂呈正相关，其含量对古气候的变迁具有重要的指示意义，MgO/Al2O3、Mg/Ca、Mn的变化规律反应了研究区经历了温湿-干热-温湿-干热-温湿的变化过程；U/Th、δU反应了研究区的沉积环境经历了氧化-还原-弱氧化的变化过程。综合分析，研究区沉积环境主要受古水深、古气候、氧化-还原环境控制。

英文摘要:

In order to study the relationship between the element geochemical characteristics in coal and the sedimentary environment，by analysis and test of borehole coal samples of Longtan Formation in Daming mining area，the characteristics of geochemical elements in coal were summarized，and the relationship between the major elements，the trace elements and the sedimentary environment was discussedThe study shows that Al2O3，TiO₂，K2O and S are terrigenous elements，and S element in coal is mainly enriched in the form of inorganic sulfurCaO，MgO and MnO₂ are positively correlated，and their contents have important indicative significance to the paleoclimatic changesThe variation law of MgO/Al2O3，Mg/Ca and Mn reflects that the study area experienced a change process of humidity-dry heat-humidity-dry heat-humidityU/Th and δU reflect that the sedimentary environment in the study area experienced a process of oxidation - reduction - weak oxidationThe comprehensive analysis shows that the sedimentary environment in the study area is mainly controlled by paleobathymetric，paleoclimate and oxidation-reduction environment

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