东天山二塘沟黏土型锂矿锂的赋存状态初探
Preliminary Study of the Occurrence of Lithium in the Ertanggou Deposit, East Tianshan
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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9 519×10-6,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 9 519×10-6), 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.
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
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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”(XGMB202103)
国家自然科学基金(42122014)
新疆维吾尔自治区重大科技专项(2021A03001)
第三次新疆科学考察(2022xjkk1301)
新疆维吾尔自治区自然科学基金资助项目(2023D01B04)
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