地质学报2024，Vol.98Issue(8)：2379-2394,16.DOI:10.19762/j.cnki.dizhixuebao.2024066
湖南头石露天矿测水组煤中锂的富集与成矿前景
Enrichment and metallogenic prospect of lithium in the coal of Ceshui Formation from the Toushi open-pit mine,Hunan Province
摘要
Abstract
The mineralogical and geochemical characteristics of elements in coal from the Lower Carboniferous Ceshui Formation at the Toushi open-pit mine in the Lianshao coalfield,Hunan Province,were investigated using a suite of analytical techniques:X-ray diffraction analysis (XRD),X-ray fluorescence (XRF),inductively coupled plasma-mass spectrometer (ICP-MS),and high-resolution transmission electron microscope (HR-TEM). The Ceshui Formation bitumite from the Toushi mine is characterized by medium-high ash yield and low volatile matter content. The dominant minerals present are kaolinite,tobelite,and calcite,followed by quartz,anatase,ankerite,microcline,siderite,and illite,with trace amounts of pyrite. Li is obviously enriched in this coal compared to global averages,with a concentration coefficient of 15.6. This enrichment exhibits a distinct spatial correlation,with concentration increasing towards the roof and floor of the coal seam. HR-TEM observation,coupled with the strong positive correlation between Li concentration and ash yield,Al2O3 and K2O content,suggest that Li is mainly hosted in aluminosilicate minerals,such as kaolinite and Li-bearing chlorite. The elevated Li concentration in the coal is attributed to the felsic nature of the parent rocks in the source regions,as well as the presence of granitic intrusions peripheral to the basin. During peat accumulation,Li migrated from these sediment sources into the peat swamp. Subsequent leaching processes,facilitated by the intermittent influx of seawater and magmatic hydrothermal fluids,further concentrated Li in the coal seam. The Li concentration in the Toushi coal seams approaches industrial recovery grade. Especially in the floor and adjacent coal seams,Li has a promising metallogenic potential.关键词
煤中锂富集/煤地球化学/煤中矿物/测水组/头石露天矿Key words
lithium enrichment in coal/coal geochemistry/minerals in coal/Ceshui Formation/Toushi open-pit mine引用本文复制引用
张涵,李晶,王园,林阳,庄新国,张晓阳..湖南头石露天矿测水组煤中锂的富集与成矿前景[J].地质学报,2024,98(8):2379-2394,16.基金项目
本文为国家自然科学基金项目(编号42372199)、国家重点研发计划项目(编号2021YFC2902000)、第三次新疆科考项目(编号2023xjkk0100)和新疆重大科技专项(编号2022A03014-2)联合资助的成果. （编号42372199）
