Molybdenum isotopic composition as a tracer for low-medium temperature hydrothermal ore-forming systems:A case study on the Dajiangping pyrite deposit,western Guangdong Province,China

作     者：SONG ShiMing HU Kai WEN HanJie ZHANG YuXu LI Kuang FAN HaiFeng 

作者机构：State Key Laboratory for Mineral Deposits ResearchSchool of Earth and EngineeringNanjing UniversityNanjing 210093China State Key Laboratory of Ore Deposit GeochemistryInstitute of GeochemistryChinese Academy of SciencesGuiyang 550002China Wuxi Research Institute of Experimental GeologySINOPEC Exploration and Production Research InstituteWuxi 214000China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2011年第56卷第21期

页      面：2221-2228页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China (40638042, 40572056, 40873014 and 40930425) the "West Light" of the Chinese Academy of Sciences 

主　　题：同位素组成 黄铁矿矿床 热液成矿 成矿系统 中国西部 中高温 广东省 示踪 

摘      要：Little is known about the range or controls on the molybdenum isotopic composition of low-medium temperature hydrothermal ore-forming *** present molybdenum isotope data from 12 hydrothermal syndepositional silicalite and carbonaceous slate samples from the Dajiangping pyrite deposit in western Guangdong Province,South *** δ 97/95Mo values from Orebody III range from ?0.02‰ to 0.29‰,with an average of 0.18‰.In contrast,the composition values from Orebody IV display a larger variation from ?0.70‰ to 0.62‰.However,the five samples from the main ore bed all show strong negative *** indicates that the significant variation in molybdenum isotopic composition supports different hydrothermal ore-forming metallogenesis and a metallogenic environment between the two *** III is likely to have been deposited from submarine exhalative hydrothermal fluids under a relatively strong reducing environment and Orebody IV may have also been influenced by hydrothermal superimposition in a more oxidized disequilibrium *** addition,the δ 97/95Mo values of Orebody IV are clearly negative,together with the values increasing stratigraphically upward in the ore beds,suggesting that the metallogenic environment of Orebody IV is different from the open oceanic *** might be dynamic fractionation in this restricted ***,the molybdenum isotope can be used as an effective tracer for the ore-forming fluid and metallogenic environment.