冀东蓟县群白云岩中锂资源的成因与赋存状态研究  

Discussion on the occurrence status and genetic mechanism of lithium in dolomite in Jixian Group,eastern Hebei

作　　者：孙艳[1] 耿晓磊 周炜智 陈云飞 李晓峰[2] 刘何凡 赵保强[2] 王克冰 SUN Yan;GENG XiaoLei;ZHOU WeiZhi;CHEN YunFei;LI XiaoFeng;LIU HeFan;ZHAO BaoQiang;WANG KeBing(Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;China University of Geosciences(Beijing),Beijing 100083,China;Hebei Provincial Geological Survey Institute,Shijiazhuang 050051,China)

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质大学(北京),北京100083 [3]河北省地质调查院,石家庄050051

出　　处：《岩石学报》2023年第9期2761-2777,共17页Acta Petrologica Sinica

基　　金：国家重点研发计划项目(2019YFC0605200、2021YFC2901900、2017YFC0602700);中央引导地方科技发展资金项目(基础研究项目)(216Z4201G);中国地质调查局地质调查评价项目(DD20221695)联合资助.

摘　　要：唐山丰润蓟县群雾迷山组中发现了Li含量达781×10^(-6)(折合Li 2O含量0.16%)的富锂白云岩,其厚度大、分布广,是重要的潜在沉积型锂资源。本文通过野外考察、样品分析测试等手段,对该区雾迷山组中锂的分布、成因和赋存状态进行了探讨,研究表明:该地区泥晶白云岩、泥质白云岩、白云质泥岩和泥岩样品中富集锂,白云岩、硅化白云岩及硅质岩不富集锂;锂的含量与伊利石含量存在显著相关性,指示伊利石可能为锂的主要赋存矿物;锂赋存位置为矿物间的非晶质伊利石等粘土矿物;样品中几乎不含吸附状态的锂,认为锂应该赋存在矿物晶格中呈类质同象状态;富锂样品和贫锂样品为同一源岩风化的产物;源岩(钙质泥岩)风化为锂富集提供稳定物质来源,含氧、干旱、浅水沉积环境有利于锂的富集。Recently,the dolomite rich in lithium was discovered in the Wumishan Formation of the Fengrun Jixian Group in Tangshan,whose Li content is up to 781×10^(-6)(equivalent to 0.16%Li 2O content).The dolomite rich in lithium distributes widely and thick in the area,so that it will be an important potential sedimentary lithium resource.By means of field investigation and sample analysis,this paper discusses the occurrence status and genetic mechanism of the lithium.Our research show that:Lithium is relatively enriched in muddy crystal dolomite,argillaceous dolomite,dolomitic mudstone and mudstone samples in this area,but not in the dolomite,silicified dolomite and siliceous rock samples;The content of lithium is significantly correlated with that of illite,i.e.,the illite maybe the main carrier minerals of lithium,and the existing location is the amorphous clay minerals between minerals;There is almost no adsorbed lithium in the samples,so it can be inferred that lithium may exist in the mineral lattice in the form of isomorphism;The samples with high lithium content have the same material source as the samples with low lithium content;The weathering of parent rock provides a stable material source for lithium enrichment;The continuous lithium adsorption of clay minerals in the sedimentary environment results in lithium enrichment;The oxygen,dry and shallow water sedimentary environment is conducive to lithium enrichment.

关 键 词：冀东地区 蓟县群 富锂白云岩 赋存状态 沉积环境 

分 类 号：P588.245[天文地球—岩石学] P618.71[天文地球—地质学]