西天山赛博铜多金属矿床流体包裹体研究及成因讨论  

Characteristics of fluid inclusions and genesis of the Saibo copper polymetallic deposit in the Western Tianshan

作　　者：唐小飞 张博文 冯京[3] 陈川 展新忠[1,2] TANG Xiao-fei;ZHANG Bo-wen;FENG Jing;CHEN Chuan;ZHAN Xin-zhong(Institute of Geology and Mines Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt,Xinjiang University,Urumqi 830047,China;Xinjiang Uygur Bureau of Geology and Mineral Resources,Uriimqi 830000,China)

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830049 [2]新疆大学中亚造山带大陆动力学与成矿预测实验室,新疆乌鲁木齐830049 [3]新疆地质矿产勘查开发局,新疆乌鲁木齐830000

出　　处：《矿物学报》2021年第2期197-212,共16页Acta Mineralogica Sinica

基　　金：国家级大学生创新创业训练计划项目(编号:201910755075);国家重点研发计划项目(编号:2018YFC0604003)。

摘　　要：赛博铜多金属矿位于西天山赛里木湖—四台海泉铜铅锌成矿带内,是该区域新突破的中-大型铜矿床。通过光薄片鉴定及流体包裹体分析得出,该矿床矽卡岩化发育,成矿期次可划分为退蚀变矽卡岩阶段(S1)、石英-硫化物阶段(S2)和石英-碳酸盐阶段(S3);包裹体类型为纯液相Ⅰ型、富液两相Ⅱa型、富气两相Ⅱb型、含子矿物Ⅲa型(含石盐子晶)和含子矿物Ⅲb型包裹体(不含石盐子晶);成矿流体显示初期以高温、高盐度,金属物质少量出现,成矿期大气降水混入,温度、盐度逐渐降低,流体沸腾、金属物质大量析出,再至晚期温度、盐度衰减并发育碳酸盐化的演化过程。C-H-O同位素显示,成矿流体早期以初始岩浆水为主,晚期以大气降水为主。S、Pb同位素表明成矿物质为壳-幔混源。总体上,赛博铜多金属矿是形成于活动陆缘岩浆弧环境的典型钙矽卡岩型矿床。The Saibo copper polymetallic deposit,located in the Sailimu Lake-Sitai Haiquan copper-lead-zinc metallogenic belt in the Western Tianshan,is a newly discovered medium-large sized copper deposit as a result of the mineral exploration breakthrough in the area.Through the thin section authentication and the theremometric analysis of fluid inclusions,it is concluded that skarnization was developed in this deposit,and the mineralization stages can be divided into the retrograde skarn stage(S1),quartz-sulfide stage(S2),and quartz-carbonate stage(S3).Fluid inclusions were distinguished as Type I of the pure liquid one phase inclusion,Type IIa of the liquid-rich two-phase inclusions,Type IIb of the vapor-rich two-phase inclusion,Type IIIa of daughter mineral-bearing inclusion(with daughter mineral of halite),and Type IIIb of daughter mineral-bearing inclusion(with other daughter minerals rather than halite).There are several stages in the evolution process of ore-forming fluids.In the early-ore stage,the ore-forming fluid is characterized with high temperature,high salinity,and occurrence of a small amount of metal minerals.In the main-ore stage,the ore-forming fluid was characterized with relatively decreased temperature and salinity due to the mixing of meteoric water and a large amount of metal minerals were precipitated due to the fluid boiling.In the late-ore stage,the ore-forming fluid was characterized with relatively low temperature and salinity and the carbonation was developed.The C-H-O isotopic results show that the ore-forming fluid was mainly composed of the primary magmatic hydrothermal fluid in the early-ore stage but meteoric water in the late-ore stage.The sulfur and lead isotopic data indicate that the metallogenic material were sourced mainly from the mixture of crustal and mantle materials.In general,the Saibo copper polymetallic deposit belongs to a typical calc-skarn type of deposit which was formed in the magmatic arc setting of the active continental margin.

关 键 词：西天山 赛博铜矿床 流体包裹体 C-H-O同位素 成因讨论 

分 类 号：P571[天文地球—矿物学] P597[天文地球—地质学]