地质论评2026，Vol.72Issue(5)：1393-1410,18.DOI:10.16509/j.georeview.2026.08.041
南大别山地区白石山高纯石英矿床成因研究
A study on the genesis of the Baishishan high-purity quartz deposit in the southern Dabie Mountains
摘要
Abstract
Objectives:High-purity quartz is an extremely important strategic mineral resource and plays an important role in multiple high-technology fields.The Baishishan deposit in the south Dabie Mountains is a renowned vein-type quartz deposit within the Tongbai—Dabie metallogenic belt of China.Previous beneficiation experiments on quartz ore from this deposit have yielded a purified product with a SiO2 content of 99.996％,which meets the criteria for high-purity quartz.An investigation into the genesis of the Baishishan deposit therefore has indicative significance for the prospecting of vein-type quartz deposits that could serve as sources of high-purity quartz raw materials. Methods:This study conducted fluid inclusion microthermometry to measure and calculate homogenization temperatures,freezing temperatures,and salinities,combined with quartz hydrogen—oxygen isotope analyses,to investigate the source of ore-forming materials and the ore-forming processes of the Baishishan deposit in the south Dabie Mountains.We selected samples with well-developed muscovite for electron microprobe analysis to determine the muscovite composition,and performed Rb—Sr isotopic dating of muscovite to constrain the metallogenic age of the Baishishan deposit in the south Dabie Mountains. Results:Fluid inclusions in vein quartz from the Baishishan deposit are predominantly primary gas—liquid two-phase inclusions.Microthermometric measurements yielded homogenization temperatures ranging from 164.8 ℃to 330℃,with the majority ranging from 190℃ to 250℃ and an average of 220.15 ℃.Freezing temperatures range from-20.1℃ to-0.2℃,with the majority ranging from-12℃ to-4℃ and an average of-8.74 ℃.Based on these freezing temperature measurements,we calculated salinities ranging from 0.35％to 22.4％NaCleqv,with an average of 11.87％NaCleqv.The homogenization temperatures and salinities of fluid inclusions in the Baishishan deposit show a certain negative correlation.The δD—δ18O diagram of quartz from the Baishishan deposit reveals that the data points of ore-forming fluids exhibit a linear distribution,falling between the metamorphic water line and the meteoric water line.The δDV-SMOW values range from-69‰ to-27‰,with an average of-41‰,which fall within the range of typical metamorphic water(-70‰ to-20‰).Oxygen isotope compositions are relatively stable,with δ18OH2O values ranging from-1.1‰ to-0.1‰ and an average of-0.6‰.Electron microprobe analyses confirm that the muscovite coexisting with quartz in the Baishishan deposit is common muscovite and formed contemporaneously with quartz.Rb—Sr isotopic dating of muscovite yielded a metallogenic age of 190.6±1.5 Ma. Conclusions:The Baishishan High-purity quartz deposit in the south Dabie Mountains formed during the late Indosinian period.We interpret its formation as closely related to dehydration reactions that occurred during the retrograde metamorphism of ultra-high-pressure metamorphic rocks,such as eclogite,as they were exhumed.The ore-forming fluids of the Baishishan deposit was primarily derived from metamorphic hydrothermal fluids.The fluids were likely dominated by metamorphic water during the early stage,with subsequent influx of meteoric water or other external fluids during the later evolution of the ore-forming system,resulting in significant fluctuations in hydrogen isotopic compositions.Such variations in geochemical characteristics may be closely related to ore-forming processes including hydrothermal circulation mechanisms,fluid boiling phenomena,or fluid—wallrock metasomatic reactions.关键词
高纯石英/白石山矿床/地球化学/矿床成因/南大别山Key words
high purity quartz/Baishishan deposit/geochemistry/ore deposit genesis/south Dabie Mountains引用本文复制引用
王云月,何振忠,肖颖,朱传海,沈欢喜,郝文俊,邓宇峰..南大别山地区白石山高纯石英矿床成因研究[J].地质论评,2026,72(5):1393-1410,18.基金项目
本文为国家重点研发计划项目"高纯石英原料矿床成矿机制与提纯关键技术"(编号:2024YFC2910100,2024YFC2910102)、安徽省公益性地质工作联项目(编号:2021-g-2-9、2021-g-2-11)、中国建筑材料工业地质勘查中心揭榜挂帅项目"高纯石英资源优选与提纯关键技术"(编号:建地科[2022]01号)的成果. This paper presents the research findings of the National Key Research and Development Program of China,titled"Metallogenic Mechanisms of High-Purity Quartz Raw Material Deposits and Key Purification Technologies"(Nos.2024YFC2910100 and 2024YFC2910102),the Anhui Province Public Welfare Geological Work Project(Nos.2021-g-2-9 and 2021-g-2-11),and the"Unveiling and Commanding"Project of the China Building Materials Industrial Geological Exploration Center,titled"Key Technologies for High-Purity Quartz Resource Selection and Purification"(No.Jian Di Ke[2022]01) （编号:2024YFC2910100,2024YFC2910102）
