武山铜矿床Cu同位素组成初步研究  

Preliminary Study on Cu Isotope Composition of Wushan Copper Mine

作　　者：李明骏 李维静 欧阳学财 艾昔文 LI Ming-jun;LI Wei-jing;OUYANG Xue-cai;AI Xi-wen(Wushan Copper Mine,Jiangxi Copper Corporation Limited,Ruichang 332204,Jiangxi,China;Northwest Jiangxi Geologic Party of JBEDGMR,Jiujiang 332000,Jiangxi,China;Nuclear Industry Geological Bureau of Jiangxi Province Brigade Two Hundred Sixty-six,Nanchang 330038,Jiangxi,China)

机构地区：[1]江西铜业集团有限公司武山铜矿,江西瑞昌332204 [2]江西省地质矿产勘查开发局赣西北大队,江西九江332000 [3]江西省核工业地质调查院二六六大队,江西南昌330038

出　　处：《铜业工程》2019年第5期35-40,共6页Copper Engineering

摘　　要：武山铜矿床是长江中下游铁铜成矿带的大型铜矿山,由南、北两个矿带组成;南矿带矿体主要赋存于燕山期花岗闪长斑岩体与碳酸盐岩类围岩接触带上,北矿带矿体主要赋存泥盆系五通组与石炭系黄龙组间,石炭系黄龙组至二叠系栖霞组的层间破碎带中。近期使用多接受电感耦合质谱仪(MC-ICP-MS)精确测定了武山铜矿床铜同位素,其测试结果可以直接用于成矿铜元素的示踪,武山铜矿床δ^65Cu值分布范围为-0.38‰~0.82‰;其中南矿带矽卡岩型矿石的δ^65Cu同位素(-0.02‰~0.66‰)分布特征与前人研究的接触带型铜矿床的铜同位素组成变化范围相近,表明南矿带是形成于接触带中的矽卡岩型矿床;北矿带含铜黄铁矿和含铜碳酸盐类矿石的δ^65Cu(0.04‰~0.82‰)分布特征与高温岩浆热液型铜矿床的铜同位素变化范围相近,表明武山铜矿北矿带与岩浆热液作用具有密切成因联系的高温岩浆热液型铜矿床。Wushan copper deposit is a large copper mine in the downstream of Yangtze River.The deposits are divided into the south ore belt and the north ore belt.The ore bodies of the south ore belt is mainly hosted in the contact zone of yanshanian granodiorite porphyry and carbonate rocks.The ore bodies of the north ore belt is mainly hosted in the interbedded fracture zones between Devonian Wutong formation and Carboniferous Huanglong formation,and between Carboniferous Huanglong formation of Carboniferous and Permian Qixia formation.The value ofδ^65Cu of Wushan copper deposit has been determined accurately by MC-ICP-MS in recently.The result ofδ^65Cu from ore can be directly used to trace the metallogenic copper elements.The value ofδ^65Cu of Wushan copper deposit is(-0.38‰~0.82‰).The distribution characteristics ofδ^65Cu isotopes(-0.02‰~0.66‰)of skarn type ore in the south ore belt is close to the variation range of copper isotopes in the contact zone copper deposits by Previous studies,suggesting that the south ore belt is skarn type deposit formed in contact zone.The distribution characteristics ofδ^65Cu isotopes(0.04‰~0.82‰)of copper-bearing pyrite and copper-bearing carbonate ores in the north ore belt is close to the variation range of copper isotopes in high-temperature magmatic hydrothermal copper deposits,suggesting that the north ore belt of Wushan copper deposit is a high temperature magmatic hydrothermal copper deposit.

关 键 词：武山铜矿床 铜同位素 物质来源 矿床成因 高温热液矿床 

分 类 号：TD166[矿业工程—矿山地质测量]