摘要
新疆是我国重要的锂矿集中区,已知矿床多以伟晶岩型和卤水型产出.最近在东天山二塘沟地区新发现有黏土型锂矿.为厘定二塘沟锂矿锂的赋存状态,开展了详细的矿床地质、全岩化学成分、X射线衍射、全自动矿物定量分析(TIMA)、电子探针分析(EPMA)、LA-ICPMS矿物原位微区元素分析以及锂的浸泡实验.结果显示,二塘沟锂矿体主要赋存于上石炭统祁家沟组富含生物碎屑的碳酸盐岩中.矿石主要组成矿物包括方解石、石英、海泡石,全岩的Li2O含量相对较高,变化于0.10%~0.27%.锂主要赋存于海泡石中,其含量高达9519×10^(−6),并且Li含量与F含量具有极好的正相关关系.二塘沟锂矿是新疆地区发现的首个黏土型锂矿,锂的赋存方式显著不同于其他黏土型矿床,具有重要的科学研究价值和找矿实践意义.
Xinjiang is an important lithium province in China.The ever-known deposits are dominated by pegmatite and brine type.Recently,a clay-type lithium deposit has been discovered in the Ertanggou area,East Tianshan.In order to determine the occurrence of lithium in the Ertanggou deposit,we carried out detailed deposit geology,whole-rock chemical composition,X-ray diffraction,automatic mineral Quantitative analysis(TIMA),electron probe microanalysis(EPMA),LA-ICPMS trace element analysis as well as soaking immersion experiments.The results show that,the lithium orebodies are mainly hosted by bioclasts-rich carbonate rocks of the Upper Carboniferous Qijiagou Formation.The ore mainly consists of calcite,quartz and sepiolite,with Li2O content of 0.10%to 0.27%.Sepiolite is the main Li-bearing phase(with Li content up to 9519×10^(−6)),and there is a good positive relationship between Li and F.Collectively,we propose that the Ertanggou deposit is the first clay-type lithium deposit discovered in Xinjiang.The occurrence of lithium in Ertanggou is significantly different from other clay-type deposits.It has important value of scientific research and practical significance of prospecting.
作者
张征峰
李诺
范香莲
王涛
李玉坤
蒋果
Zhang Zhengfeng;Li Nuo;Fan Xianglian;Wang Tao;Li Yukun;Jiang Guo(Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;First Geological Brigade of Xinjiang Geological and Mining Bureau,Changji 831100,China;Turpan Jinyuan Mining&Metallurgy Co.Ltd.,Turpan 838000,China;Xinjiang Key Mineral Exploration and Development Technology Innovation Base,China Geological Society,Urumqi 830011,China;Key Laboratory of Ecological Security and Sustainable Development of Arid Areas,State Key Laboratory of Desert and Oasis Ecology,Chinese Academy of Sciences,Urumqi 830011,China;Xinjiang Laboratory of Mineral Resources and Digital Geology,Urumqi 830011,China)
出处
《地球科学》
北大核心
2025年第2期585-595,共11页
Earth Science
基金
新疆地矿局自筹项目“新疆鄯善县二塘沟一带锂硼矿产调查评价(No.XGMB202103)”
国家自然科学基金(No.42122014)
新疆维吾尔自治区重大科技专项(No.2021A03001)
第三次新疆科学考察(No.2022xjkk1301)
新疆维吾尔自治区自然科学基金资助项目(No.2023D01B04).
关键词
赋存状态
海泡石
黏土型锂矿
碳酸盐岩
东天山
矿床学
occurrence
sepiolite
clay-type lithium deposit
carbonate
East Tianshan
mineral deposit
