首页|Ore Geology,H-O-C Isotopes and 40Ar-39Ar Dating of the Wutonggou Iron Deposit,Eastern Tianshan,NW China:Implications for the Source,Timing,and Genesis of Hydrothermal Mineralization in a Sedimentary Iron Deposit
Ore Geology,H-O-C Isotopes and 40Ar-39Ar Dating of the Wutonggou Iron Deposit,Eastern Tianshan,NW China:Implications for the Source,Timing,and Genesis of Hydrothermal Mineralization in a Sedimentary Iron Deposit
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The Wutonggou iron deposit is located in the well-known iron metallogenic belt in the eastern Tianshan,NW China,and has been regarded as a sedimentary iron deposit.Although hydro-thermal overprinting could play indispensable roles in the formation of high-grade iron ores in sedi-mentary iron deposits,previous studies mainly focused on sedimentary-related iron mineralization,while the nature and contribution of hydrothermal fluids are poorly constrained.Accordingly,an inte-grated study of ore geology,H-O-C isotopes and 40Ar-39Ar dating,is conducted on the Wutonggou de-posit,in order to reveal the features,source,and timing of hydrothermal mineralization.The studied deposit includes two mining sections namely the Jianshan and Wutonggou.The δ18O values of early magnetite from the Jianshan section range from+3.0‰ to+5.8‰ that nearly consistent with classic magmatic magnetite,while increase to 6.3‰-8.0‰ in the late stage.Quartz from the two sections shows comparable H-O isotopic compositions and identical fractionation trends,and is plotted in or pe-riphery to the primary magmatic water area.Calcites from the two sections are broadly similar in car-bon and oxygen isotopic compositions,and siderite from the Wutonggou section is plotted in the same region.Thus,comparable stable isotopic compositions and evolution trends indicate similar magmatic fluids contributed hydrothermal iron mineralization in the two mining sections.Moreover,water-rock interactions of varying degrees generated distinct mineralization styles in the Jianshan and Wutonggou sections,and caused the isotopic fractionation in late stages.Biotite extracted from a hydrothermal sid-erite ore yielded a 40Ar-39Ar plateau age of 299.5±2.0 Ma,indicates the timing of hydrothermal iron mineralization is corresponding to the emplacement of vicinity granitoids.Taken together,the hydro-thermal mineralization in the Wutonggou iron deposit was the product of remobilization and upgrad-ing of early sedimentary iron ores,and ore-forming fluids were most probably originated from regional granitic magmatism.
iron depositsH-O-C isotopes40Ar-39Ar datingsedimentary iron depositsWutonggou iron depositeastern Tianshan
Chun-Long Wang、Yi-Tian Wang
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State Key Laboratory of Geological Processes and Mineral Resources,Collaborative Innovation Center for Exploration of Strategic Mineral Resources,School of Earth Resources,China University of Geosciences,Wuhan 430074,China
MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China
National Key R&D Program of China Ministry of Science and TechnologyChina Geological Survey
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