印度尼西亚苏门答腊岛马塔比(Martabe)浅成低温热液型金-银矿床的地质特征与找矿标志  

Geological Features and Prospecting Indicators of Martabe Epithermal Au-Ag Deposit,Sumatra,Indonesia

作　　者：张海坤[1] 胡鹏[1] 姜军胜 程湘[1] 战明国 潘罗忠 戴昱 潘贝红 ZHANG Haikun;HU Peng;JIANG Junsheng;CHENG Xiang;ZHAN Mingguo;PAN Luozhong;DAI Yu;PAN Beihong(Wuhan Center,China Geological Survey,Wuhan 430205,China;GuangXi Bureau of Geology and Mineral Prospecting and Exploitation,Nanning 530023,China;China-Asean Geoscience Cooperation Center(Nanning),Nanning 530023,China;Regional Geological Survey Institute of Guangxi Zhuang Autonomous Region,Guilin 450304,China)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]广西壮族自治区地质矿产勘查开发局,南宁530023 [3]中国东盟地学合作中心(南宁),南宁530023 [4]广西壮族自治区区域地质调查研究院,桂林450304

出　　处：《高校地质学报》2021年第2期163-171,共9页Geological Journal of China Universities

基　　金：广西壮族自治区地质矿产勘查开发局地质勘查基金项目“广西与东盟特提斯构造过程与大规模成矿作用对比研究”资助。

摘　　要：马塔比矿床位于印度尼西亚北苏门答腊省,是印度尼西亚近年确认的一处世界级高硫浅成低温热液型金-银矿床。文章在梳理前人研究的基础上,对其成矿地质特征与找矿标志进行了总结,以丰富该类型矿床实例,指导找矿实践。该矿床金银矿化呈现典型的高硫型浅成低温热液系统蚀变分带特征,由内而外依次发育硅化带、高级泥化带、泥化带、青磐岩化带。赋矿英安岩的锆石U-Pb定年结果为(3.8±0.5)Ma,热液变质成因明矾石的Ar-Ar坪年龄分别为(3.3±0.11)Ma和(2.14±0.10)Ma,表明成岩与成矿间隔时间较短,且可能存在两期高级泥化蚀变作用。成矿作用既有岩浆热液又有大气水的参与,后期地表风化作用使金和银进一步富集。马塔比矿床具有高硫型浅成低温热液矿床的典型特征,总结其找矿标志包括构造环境标志、岩性标志、蚀变标志和化探标志。The Martabe deposit,located in the North Sumatra,Indonesia,is a world-class high-sulfidation epithermal Au-Ag deposit discovered in recent years.Based on a comprehensive review of previous knowledge of this deposit,this paper present a summary of its metallogenic geological features,aiming to enrich the cases of epithermal deposits and guide exploration of this type of deposits.The Martabe deposit has similar alteration zonation with typical high-sulfidation epithermal deposit,with zones such as silica,advanced argillic,argillic,and prophylitic zones from the core to the margin.Zircon U-Pb dating on ore-bearing dacite yielded an age of(3.8±0.5)Ma,while two ages of(3.3±0.1)Ma and(2.1±0.1)Ma were obtained from Ar-Ar age determination on hydrothermal alunite,indicating a brief interval between diagenesis and mineralization and two stages of advanced argillic alteration.Mineralization was associated with the interaction between magma-sourced fluid and meteoric water and further intensified by weathering and erosion following ore-forming.Martabe deposit shares characteristics with the classical high-sulfidation epithermal deposits,displaying prospecting signals in the aspects of tectonic setting,lithology,alteration,and geochemical explorations.

关 键 词：印度尼西亚 马塔比 浅成低温热液 金-银矿 

分 类 号：P641.42[天文地球—地质矿产勘探]