广西平南县鸡冠石金矿床成矿机制研究  

Research on Metallogenic Mechanism of Jiguanshi Gold Deposit in Pingnan County of Guangxi

作　　者：姜邦浩 高谢君 李有炜 李学志 杨琨[1] 李鹏海 刘晓珠 丁大庆 陈继永 JIANG Banghao;GAO Xiejun;LI Youwei;LI Xuezhi;YANG Kun;LI Penghai;LIU Xiaozhu;DING Daqing;CHEN Jiyong(China Metallurgical Geology Bureau of Geological Prospecting Institute of Guangxi,Nanning,Guangxi 530022,China;Institute of Mineral Resources Research,China Metallurgical Geology Bureau,Beijing 100025,China;Guangxi Sifang Huitong Talent Service Co.,Ltd.,Nanning,Guangxi 530026,China)

机构地区：[1]中国冶金地质总局广西地质勘查院,广西南宁530022 [2]中国冶金地质总局矿产资源研究院,北京100025 [3]广西四方汇通人才服务有限责任公司,广西南宁530026

出　　处：《中国锰业》2023年第3期38-45,共8页China Manganese Industry

基　　金：国家自然科学基金(编号:41362006);中国地质调查局地质调查工作项目(编号:12120114052501);广西自然科学基金项目(编号:2013GXNSFAA019275)。

摘　　要：广西平南县鸡冠石金矿位于大瑶山地区中西部,金矿体主要受新坪背斜和近东西向的断裂破碎带控制,主要赋存于寒武系黄洞口组砂岩、砂泥岩中,局部穿插加里东期花岗斑岩脉;钨矿矿体类型为斑岩型,主要赋存于加里东期花岗斑岩体(脉)中。依据成矿(岩)年龄数据及矿体与围岩的穿插关系可知,斑岩型钨矿成矿时代为加里东期,金矿体的主成矿时代不是加里东期;石英流体包裹体数据显示,金矿成矿流体为中温低盐度低密度含CO_(2)的流体;氢氧同位素分析显示,金矿成矿流体中水部分来源于岩浆,部分来源于变质水,可能还有少量大气降水;钨矿成矿流体中水主要来源于深部岩浆。对硫同位素及稀土元素的分析表明,金矿成矿物质部分来源于岩浆,部分来源于寒武系地层;斑岩型钨矿成矿物质主要来源于岩浆,寒武系地层的贡献较小。据此,对矿床成矿机制进行了研究,认为鸡冠石金矿床属于变质热液-岩浆热液叠加改造成矿,并尝试建立了成矿模式。The Jiguanshi gold deposit in Pingnan County,Guangxi Province,which is located in the central and western part of Dayaoshan Area.The gold ore bodies are mainly controlled by Xinping anticline and nearly east-west trending fracture zone.The gold ore bodies mainly occur in sandstone,sand and mudstone of Cambrian Huangdongkou Formation,partially interpenetrating caledonian granite porphyry.The type of tungsten ore body is porphyry,mainly occurring in caledonian granite porphyry(vein).According to the ore-forming(rock)age data and the interpenetrating relationship between ore body and surrounding rock,the ore-forming time of porphyry tungsten ore is Caledonian period,while the main ore-forming time of gold ore body is not.The fluid inclusion in quartz data show that the gold ore-forming fluid is fluid with medium temperature,low salinity,low density and containing CO2.Hydrogen and oxygen isotope analysis shows that the partial water in the gold ore-forming fluid comes from magma,some from metamorphic water and a little part may be meteoric water.The water in ore-forming fluid of tungsten deposit mainly comes from deep magma.The analysis of sulfur isotope and rare earth elements shows that the ore-forming materials are partly derived from magma and partly from Cambrian strata.Porphyry tungsten deposits are mainly derived from magma,and the Cambrian strata contribute a little.Based on that,the metallogenic mechanism of the Jiguanshi gold deposit is studied,and it is considered that the Jiguanshi gold deposit belongs to metamorphic magmatic hydrothermal superimposed reformation,and the metallogenic model is established.

关 键 词：成矿时代 成矿物质来源 成矿模式 鸡冠石金矿 广西平南县 

分 类 号：P618.51[天文地球—矿床学]