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The study of fluid inclusions in the Pingqiao fluorite-lithium deposit, Liuzhi area, Guizhou

• 1、College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025

Abstract：Lithium and fluorite are the strategic mineral species of most countries in the world and the key object of "the new round of mining breakthrough strategic action". The Liuzhipingqiao fluorine-lithium deposit belongs to the low temperature metallogenic area in southwestern Guizhou, which is located in the northern margin of Youjiang Basin and is an important part of the large area of low temperature metallogenic field in South China. In addition to the hydrothermal gold and antimony deposits, the fluorine-lithium mineralization phenomenon is also widely developed in this area. The metallogenic theory of fluorine-lithium and its relationship with large-scale low-temperature gold and antimony mineralization still need further study. On the basis of systematic geological survey and in situ analysis, combined with the latest exploration results, this study summarized and analyzed the metallogenic regularity of Pingqiao fluorine-lithium deposit and its genetic relationship with low-temperature deposit. The mineralogical study of Pingqiao fluorine-Lithium deposit shows that fluorite can be divided into two phases: the early fluorite (Fl-1) is fine grained and coexists with the lithium-bearing clay minerals such as geocallite and chlorite; Late fluorite (FI-11) has coarse-grained structure, mainly in vein, mass filling, fissure and dissolution cavity. The microtemperature measurement of fluorite fluid inclusions in the two stages showed that the early fluorite was mainly gas-rich, with homogenization temperature ranging from 227℃ to 435℃ (mean: 341 ℃) and salinity ranging from 1.06 to 7.86wt % NaCI eqv (mean wt% 4.13 NaCl eqv). The late fluorite is mainly rich in liquid phase, with homogenization temperature ranging from 145℃ to 330℃(average: 237 ℃) and salinity ranging from 1.06-7.45wt % NaCl eqv. (average: 2.76wt % NaCl eqv.). The comparative study of au-Sb low temperature mineralization in Youjiang Basin shows that the temperature and salinity characteristics of Pingqiao fluorite mineralization are related to the large area of low temperature hydrothermal mineralization events represented by au-SB mineralization. Combined with previous studies, the latest exploration results show that the spatial distribution of the fluorite deposit is controlled by the deep faults in the region, and the production of fluorite in the deposit is obviously controlled by the detachment structure between different lithologic planes (or unconformity), and the anticline (dome) formed by the multilevel detachment structure is the favorable location for fluorite mineralization. Therefore, the intersection of Shuicheng-Ziyun fault and Shizong-Maitre fault in the northern margin of Youjiang Basin (Liuzhi - Pu 'an - Qinglong area) is a fluorite metallogenic prospect area, and the periphery of hydrothermal gold and anticline and the multi-layered structural detachment surface have greater fluorite metallogenic potential.)

Keywords： Metallogenic theory Fluid inclusions Low temperature hydrothermal fluid Fluorite