新疆乌恰县帕恰布拉克天青石矿床成因研究  

A research on genesis of the Paqiabulake celestine deposit in Wuqia Country, Xinjiang Autonomous Region, China

作　　者：郭海丽 方维萱[1,2] 王磊[2] 鲁佳[2,3] 郝贵宝 GUO Hai-li;FANG Wei-xuan;WANG Lei;LU Jia;HAO Gui-bao(China university of geosciences,Beijing 100083,China;China Non-Ferrous Metals Resource Geological Survey,Beijing 100012,China;Kunming University of Science and Technology,Kunming 650093,China;Beijing Construction Environmental Engineering Consulting Co.LTD,Beijing 100015,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]有色金属矿产地质调查中心,北京100012 [3]昆明理工大学,云南昆明650093 [4]北京建工环境工程咨询有限责任公司,北京100015

出　　处：《矿物学报》2019年第6期735-744,共10页Acta Mineralogica Sinica

基　　金：国土资源部行业专项科研项目(编号：201511016-1);中国地质调查局项目(编号：12120114081501;20170418);国家自然科学基金项目(批准号：41872160)

摘　　要：应用岩相学及矿相学镜下鉴定、粉晶衍射半定量分析、包裹体测试分析及电子探针分析技术,结合地质温压计估算流体的温度,对天青石矿床的成因进行探讨。结果表明,新疆乌恰县帕恰布拉克天青石矿床中矿石类型主要有厚层块状天青石岩、天青石化灰岩、天青石化硅质细砾岩及热液角砾状天青石岩。矿物主要为天青石、方解石、白云石等。成矿流体主要为3种类型,分别为气相高温中盐度流体、液相中温高盐度流体及液相低温低盐度流体。矿床的形成可划分为2个期次5个阶段,其中2个期次分别为热卤水同生沉积成岩成矿期、盆地流体改造期。5个阶段为富锶热卤水同生沉积-交代阶段、富锶热卤水同生沉积阶段、热卤水喷流沉积阶段,后期含碳酸盐质的热水混合沉积阶段,盆地流体改造阶段。The techniques of petrographic and mineralographic microscopic identification,X-ray powder diffraction semi-quantitative analysis,fluid inclusion test analysis,and electron probe analysis have been applied to study the Paqiabulake celestine deposit in Wuqia County,Xinjiang Autonomous Region in this paper.With the combination of the calculated temperature of hydrothermal fluid by using geothermometer,the genesis of the celestine deposit has been discussed.The results show that there are main ore types of thick bedded or massive celestite,celestitized limestone,celestitized siliceous breccia,and brecciated celestite,with main minerals of celestine,calcite and dolomite in the Paqiabulake celestine deposit.Moreover,there are three kinds of fluids,namely,gas phase high-temperature medium-salinity fluid,liquid phase medium-temperature high-salinity fluid,and liquid phase low-temperature low-salinity fluid.The celestite deposit is believed to have experienced two periods and five stages of mineralization.The two periods of mineralization are the hot brine syngenetic sedimentary diagenetic mineralization period and the basin fluid reworking period.The five mineralization stages are the strontium-rich hot brine syngenetic deposition-metasomatism stage,strontium-rich hot brine syngenetic deposition stage,hot brine SEDEX stage,carbonate-bearing hot water mixed deposition stage,and basin fluid reworking stage,respectively.

关 键 词：天青石 热卤水同生沉积 矿床成因 乌恰县 

分 类 号：P611[天文地球—矿床学] P616[天文地球—地质学]