海南省东方市踏王山金矿床H-O和S-Pb同位素特征及意义  

Isotope characteristics of H-O and S-Pb in Tawangshan gold deposit, Dongfang City, Hainan Province

作　　者：熊瑛[1] 朱自强[1] 鲁光银[1] 胡祥昭[1] XIONG Ying;ZHU Ziqiang;LU Guangyin;HU Xiangzhao(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,School of Geoscience and Info-Physics,Central South University,Changsha 410083,China)

机构地区：[1]有色金属成矿预测与地质环境监测教育部重点实验室,中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2018年第9期2249-2256,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41174061,41374120)

摘　　要：通过对海南省东方市踏王山金矿床矿化期石英氢氧同位素、黄铁矿、方铅矿的硫、铅同位素特征的系统分析和综合研究,探讨矿区的成矿流体来源与成矿物质来源。研究结果表明:矿石中18OSMOW的质量分数w(18OSMOW)为7.7‰~16.3‰,18OH2O质量分数w(18OH2O)为1.0‰~6.8‰,反映出成矿流体具有变质热液和岩浆热液的双重性;矿石中w(34S)变化范围为6.3‰~9.1‰,平均值为7.8‰,极差为2.8‰,变化范围较窄,略微偏离陨石硫;矿石硫化物w(206Pb)/w(204Pb)平均值为18.25,w(207Pb)/w(204Pb)平均值为15.53,w(208Pb)/w(204Pb)平均值为37.91;硫、铅同位素表明成矿物质来源于深部岩浆,并有壳源物质的混染。The Tawangshan gold deposit in Hainan Province is located in the southwest of the Gezhen ductile shear zone in southwestern Hainan Island.Through systematic analysis and comprehensive study on the characteristics of hydrogen and oxygen isotopes of quartz,sulfur and lead isotopes of pyrite and galena during the mineralization period of Tawangshan gold deposit in Dongfang City,Hainan Province,the source of ore-forming fluids and source of ore-forming materials in the mining area were discussed.The results show that the mass fraction of 18OSMOW,i.e.,w(18OSMOW),ranges from 7.7‰to 16.3‰,and w(18OH2O)ranges from 1.0‰to 6.8‰,suggesting that the ore-forming fluid is the dual nature of the metamorphic and magmatic hydrothermal.w(34S)ranges from 6.3‰to 9.1‰,with an average of 7.8‰,showing a narrow range and slight deviation from meteorite sulfur.The average value of w(206Pb)/w(204Pb)is 18.25,and w(207Pb)/w(204Pb)is 15.53,w(208Pb)/w(204Pb)is 37.91.The compositions of sulfur isotope and lead isotope imply that the metallogenic materials of the deposit derive from the deep magma mixed with the shell source material contamination.

关 键 词：金矿床 同位素 成矿物质来源 海南踏王山 

分 类 号：P611.1[天文地球—矿床学]