广西上林二叠系含锂岩系的地球化学特征与锂富集成因探讨

Geochemical Characteristics and Lithium-rich Synthesis of the Permian Lithium-bearing Rock System in Shanglin,Guangxi

随着新兴产业的高速发展,全球锂金属的需求急剧增加,世界各国正面临日益突出的供需矛盾。煤系锂矿床具有巨大资源潜力和开发利用价值,可为战略性金属矿产的工业化生产需求提供保障。本研究以广西上林县万福矿区作为典型研究区,该区部分煤层中存在锂含量较高的异常富集点,但在平面及纵向分布上存在一定的不均一性,本文围绕万福矿区煤系地层纵向分布的多层赋锂矿层开展成因及物质来源探讨,通过矿物学和地球化学的研究方法,揭示煤系沉积型锂矿的富集规律。研究表明,广西二叠系含锂岩系的形成经历了风化-沉积-成岩三个阶段。中酸性岩浆岩作为主要物质基础,在陆相环境中风化,随着后期地壳下降,海水淹没台地并沉积碳酸盐岩,最终含锂岩系进入压实、成岩阶段。

With the rapid development of emerging industries,the global demand for lithium metal has increased sharply.Countries around the world are facing an increasingly prominent contradiction between supply and demand.Coal-measure lithium deposits have great resource potential and great value for development and utilization,which can provide a strategic metal guarantee for the industrial production.In this paper,the genetic model and material sources of the multi-layer lithium-bearing measures in Wanfu mining area are studied,and the enrichment law of lithium-bearing coal measures is revealed through mineralogical and geochemical research methods.It is speculated that the formation of the Permian lithium-bearing seams in Guangxi has gone through three stages:weathering-sedimentation-diagenesis.With the medium-acid magmatic rocks as the main material basis,weathering in the continental environment,and with the later crustal decline,the seawater floods the platform and deposits carbonate rocks,and finally,the lithiumbearing seams enter the stage of compaction and diagenesis.