新疆东准噶尔蕴都卡拉金铜钴矿成矿作用:来自流体包裹体和H-O-S同位素证据  

Metallogenesis of the Yundukala Au-Cu-Co Deposit in East Junggar,Xinjiang:Constraints from Fluid Inclusions and H,O,and S Isotopes

作　　者：杨富全[1,2] 张汉清 张志欣 李宁[5] 侯施睿[6] 张艳灵 YANG Fuquan;ZHANG Hanqing;ZHANG Zhixin;LI Ning;HOU Shirui;ZHANG Yanling(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;National 305 Project Office of Xinjiang,Urumuq 830000,Xinjiang,China;No.4 Geological Party of the Xinjiang Bureau of Geo-Exploration&Mineral Development,Altay 836500,Xinjiang,China;Xinjiang Research Center for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumuq 830011,Xinjiang,China;College of Geological and Surveying Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Earth Sciences,Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037 [2]新疆维吾尔自治区人民政府国家305项目办公室,新疆乌鲁木齐830000 [3]新疆维吾尔自治区地质矿产勘查开发局第四地质大队,新疆阿勒泰836500 [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]太原理工大学地球科学与测绘工程学院,山西太原030024 [6]河北地质大学地球科学学院,河北石家庄050031

出　　处：《大地构造与成矿学》2024年第6期1258-1273,共16页Geotectonica et Metallogenia

基　　金：新疆维吾尔自治区重点研发任务专项(2023B03006-2);国家自然科学基金项目(41972079);新疆维吾尔自治区“天池英才”引进计划;第三次新疆科考项目(2022xjkk1301-10)联合资助。

摘　　要：蕴都卡拉矿床是少见的金铜钴矿床,包括与侵入岩有关的金铜钴成矿系统和与剪切变形有关的金成矿系统。与侵入岩有关的金铜钴成矿系统矿化主要分布于细粒闪长岩中或与玄武岩接触带附近,包括块状矿化和细脉状矿化,后者经历了绿泥石阶段、石英-多金属硫化物阶段(主成矿阶段)和石英(方解石)阶段。硫化物的δ^(34)S为-5.3‰~4.3‰,峰值为-3.5‰,表明硫来自深源岩浆。主成矿阶段均一温度集中于120~300℃,流体盐度集中在4%~11%NaCl_(eqv)和16%~20%NaCl_(eqv)范围内,密度为0.34~1.06 g/cm^(3),表明主成矿阶段成矿流体具有中低温、中低盐度和中低密度的特征,成矿作用发生于浅成环境(<1 km)。石英δD值为-91‰~-58‰,δ^(18)O_(H_(2)O)值为-0.7‰~5.9‰,表明成矿流体为岩浆水混合大气降水。主成矿阶段不混溶作用导致CO_(2)-CH_(4)±N_(2)从NaCl-H_(2)O中分离出来,岩浆水与大气降水混合是导致金铜钴等成矿物质沉淀的主要因素。The Yundukala is a unique deposit composed of intrusion-related Au-Cu-Co metallogenic system and shear deformation-related Au metallogenic system.The Au-Cu-Co mineralization including the massive and vein mineralization,is mainly distributed in the fine-grained diorite and its contact zone with the basalt.The ore-forming process of vein mineralization can be divided into three stages:chlorite alteration,quartz-polymetallic sulfide(the main mineralization stage),and quartz-(calcite)stages.The δ^(34)S values of different sulfides varies from -5.3‰ to 4.3‰(with a peak value of -3.5‰),indicating that the ore-forming material originated from deep-seated magma.The characteristics such as mediumlow temperature(120 to 300℃),medium-low salinity(4% to 11%NaCleqv and 16% to 20%NaCleqv),and medium-low density(0.34 to 1.06 g/cm^(3))of the ore-forming fluids suggest that the mineralization occurred in a shallow environment(<1 km).In addition,the δD and δ^(18)O_(H_(2)O) values of quartz are -91‰ to -58‰and−0.7‰ to 5.9‰,respectively.It is suggested that the ore-forming fluids are magmatic water mixed with meteoric water.In conclusion,the fluid immiscibility in the main mineralization stage of the Yundukala deposit led to the separation of CO_(2)-CH_(4)±N_(2) from NaCl-H_(2)O,and the mixing of magmatic water and meteoric waters was the main factor leading to the precipitation of gold,copper,and cobalt.

关 键 词：金铜钴矿 流体包裹体 H-O-S同位素 蕴都卡拉 东准噶尔 

分 类 号：P597[天文地球—地球化学] P611[天文地球—地质学]