新疆哈密小白石头钨钼矿床流体包裹体及矿床成因  

Fluid Inclusions Constraints on the Origin of the Xiaobaishitou W-Mo Deposit in Hami,Xinjiang,NW China

作　　者：陈叙安 邓小华 张静[1] 姜晓[3] 郑震[1] 吴艳爽 岳素伟[5] Chen Xu＇an;Deng Xiaohua;Zhang Jing;Jiang Xiao;Zheng Zhen;Wu Yanshuang;Yue Suwei(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;Beijing Institute of Geology for Mineral Resources,Beijing 100012,China;No.6 Geological Survey Team,Bureau of Xinjiang Geology and Mineral Resources Development,Hami 839000,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;Guangzhou College of South China University of Technology,Guangzhou 510800,China)

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]北京矿产地质研究院,北京100012 [3]新疆维吾尔自治区地质矿产勘查开发局第六地质大队,新疆哈密839000 [4]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011 [5]华南理工大学广州学院,广东广州510800

出　　处：《地球科学》2018年第9期3086-3099,共14页Earth Science

基　　金：国家重点基础研究发展计划(973计划)项目(No.2014CB440803);国家重点研发计划重点专项项目(No.2018YFC0604006);国家自然科学基金项目(No.41572077);中国地质调查局项目(Nos.12120114081701;1212011140056)

摘　　要：新疆哈密小白石头钨钼矿床位于中天山地块,是北疆代表性的钨钼矿床,但人们对其成矿流体性质和矿床成因类型了解得很少.矿床地质研究表明,矿体主要产于三叠纪黑云母花岗岩与蓟县系卡瓦布拉克群碳酸盐岩接触带,根据穿插关系和矿物组合,成矿阶段可划分为干矽卡岩、湿矽卡岩、氧化物、硫化物和碳酸盐5个阶段,白钨矿和辉钼矿分别形成于氧化物和硫化物阶段.流体包裹体显微测温结果表明,成矿早期(干矽卡岩阶段)流体为中高温、中高盐度的NaCl-H_2O-CO_2体系,成矿晚期(碳酸盐阶段)演变为低温、低盐度的NaCl-H_2O体系.小白石头矿床为矽卡岩型钨钼矿床,流体包裹体特征指示流体混合及降温可能是矿质沉淀的主要机制.The Xiaobaishitou W-Mo deposit is one of the typical W-Mo deposits in North Xinjiang,located in the eastern Tianshan Orogen.The ore body mainly occurs in the contact zone between Triassic biotite granite and crystalline limestone of the Mesoproterozoic Kawabulag Group.However,the characteristics of metallogenic fluid and genetic type of the Xiaobaishitou deposit remain relatively unclear.Based on the ore textures,structures and mineral assemblages observed,it is inferred that the deposit has been formed in a five-stage hydrothermal process,namely dry skarn,wet skarn,oxide,sulfide and carbonate stages.Scheelite and molybdenite occurred in oxide and sulfide stages,respectively.Microthermometric data show that the ore fluid system evolved from CO2-rich,probably magmatic hydrothermal to CO2-poor,meteoric fluid.The microthermometric re-sults also suggest that metal precipitation resulted from fluid mixing and cooling.Here we propose that the Xiaobaishitou W-Mo deposit may be a skarn mineral system.

关 键 词：小白石头钨钼矿 矽卡岩矿床 流体包裹体 东天山 矿床学 

分 类 号：P611[天文地球—矿床学]