云南者桑卡林型金矿成矿流体特征及其对Au成矿的指示意义  

Characteristics of the Ore-Forming Fluid of the Zhesang Carlin-Type Gold Deposit, Yunnan Province and Their Implications to the Gold Mineralization

作　　者：高云鹏 黄从俊[2] GAO Yun-peng;HUANG Cong-jun(Shandong Provincial No.4Institute of Geological and Mineral Survey,Weifang Shangdong 261000,China;School of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]山东省第四地质矿产勘查院,山东潍坊261000 [2]成都理工大学地球科学学院,成都610059

出　　处：《矿物岩石地球化学通报》2018年第6期1062-1073,共12页Bulletin of Mineralogy, Petrology and Geochemistry

摘　　要：为探讨者桑金矿床的成矿流体特征、Au的沉淀机制及基性岩浆活动与Au成矿的关系,对该矿床热液成矿期的流体包裹体进行了显微测温研究,并对热液矿物进行了H、O、C同位素分析。结果表明,矿床中包裹体有气液H2O、CO2-H2O和纯CO2包裹体3种类型,成矿流体温度从早阶段到晚阶段逐渐降低、主成矿阶段盐度高于早晚两个阶段;热液成矿期早阶段成矿流体以岩浆水为主,主成矿阶段为岩浆水和大气降水混合,成矿晚阶段以大气降水为主;成矿晚阶段热液方解石中的碳质主要来自幔源碳的低温蚀变。研究认为,者桑金矿床成矿流体为岩浆水和大气降水的混合流体,Au的沉淀与NaCI-H2O-CO2流体不混溶作用密切相关,基性岩浆侵入活动为成矿流体提供热源、H2O、CO2和Au。In order to discuss the characteristics of the ore-forming fluid,precipitation mechanism of gold,and the relationship between basic magmatism and gold mineralization of the Zhesang Carlin-type gold deposit,micro-thermometry of fluid inclusions and analysis of C,H,and O stable isotopes of hydrothermal minerals of the deposit have been undertaken in this paper.The results show that there are three types of inclusions,which include liquid-vapor inclusions,CO2-H2O inclusions and pure CO2 inclusions,in this deposit.Homogenization temperatures of the ore-forming fluid in inclusions are decreased from the early stage to the late stage,but the salinity of inclusion fluid of the main mineralization stage is higher than the those of inclusion fluids in the early and late stages.The ore-forming fluid of the early mineralization stage is mainly composed of magmatic water,that of the main mineralization stage is a mixture of magmatic and meteoric waters, while that of the late mineralization stage is mainly composed of meteoric water.Carbon in calcite of the late mineralization stage is mainly sourced from the low-temperature alteration of the mantle-derived Carbon.Therefore,it is believed that ore- forming fluid of the Zhesang Carlin-type gold deposit is a mixture of magmatic and meteoric waters.The precipitation of Au is closely related to the immiscibility of NaCI-H2O-CO2 fluid in the main mineralization stage.In addition,the mafic magmatism not only provides heat source,but also provides H2O,CO2 and Au for the ore-forming fluid of the Zhesang Carlintype gold deposit.

关 键 词：者桑卡林型金矿 成矿流体特征 流体不混溶 基性岩浆活动 

分 类 号：P595[天文地球—地球化学] P597[天文地球—地质学]