淮南煤田晚二叠世煤中锂、镓和稀土元素分布特征差异性研究Differences in Distribution Characteristics of Lithium, Gallium and Rare Earth Elements in the Late Permian Coals of Huainan Coalfield
岳振,刘桂建,胡皓,鲁梦菲,谢宗璠
摘要(Abstract):
为研究淮南煤田晚二叠世煤中锂、镓和稀土元素赋存状态、分布特征及其影响因素,以晚二叠世主采煤层13~(-1)和11~(-2)煤为研究对象,采用电感耦合等离子质谱(ICP-MS)测定了煤中微量元素的含量,并结合工业分析和常量元素含量,分析了煤中锂、镓和稀土元素的分布规律。结果表明:11~(-2)煤中锂、镓和稀土元素含量整体比13~(-1)煤高且远高于世界硬煤。13~(-1)煤中的锂、镓和稀土元素主要赋存于煤中的无机矿物中,而11~(-2)煤中的稀土元素可能赋存于煤中的有机质中,两煤层的沉积物源和沉积环境控制了锂、镓和稀土元素分布的总体特征。通过Al_2O_3/TiO_2比值、元素地球化学特征分析得知沉积源区为中间质烃源岩。δCe和δY的正异常综合推断海水活动对稀土元素的重新分配产生了影响。
关键词(KeyWords): 锂;镓;稀土元素;淮南煤田;晚二叠世
基金项目(Foundation): 国家重点研发计划资助项目(2021YFC2902002);; 安徽省自然资源厅公益性地质资助项目(2022-g-1-11)
作者(Author): 岳振,刘桂建,胡皓,鲁梦菲,谢宗璠
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