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《The Chinese Journal of Nonferrous Metals》 2012-03
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REE geochemistry application in discrimination of metallogenic system and ore genesis: An example from iron polymetallic orefield in Taliabu Island, Indonesia

HAN Shi-li1,2,ZHANG Shu-gen1,2,DING Jun1,2,XU Zhong-fa3,QIN Xin-long3(1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University,Changsha 410083,China;2.School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;3.East China Mineral Exploration and Development Bureau,Nanjing 210007,China)  
Taking the iron polymetallic orefield in Taliabu Island,Indonesia as an example,the application of REE geochemistry in discrimination of metallogenic system and the regularities of REE superposition and evolution in the same mineralization system were investigated.The results show that in Taliabu Island,granite,marble,metamorphic sandstone and skarn are the composition parts of the iron polymetallic metallogenic system except for diabase.Ore magma and skarn magnetite ores as well as Cu-Zn sulfide ores are originated from the same metallogenic system.In this system,ore magma type is a relatively independent subsystem,that is,a crystal fractionation system of Indosinian granites;skarn type and hydrothermal filling type belong to another subsystem,that is,a contact metasomatic metallogenic system.Two subsystems belong to a complete mineralization system from magma stage to hydrothermal stage.From ore magma type to skarn type to hydrothermal filling type,negative Eu anomaly decreases,REE fractionation degree increases,and HREE enrichment converts to LREE enrichment gradually.Therefore,REE geochemistry is an effective method in discriminating mineralization system and ore genesis.
【Fund】: 中南大学与华东有色地勘集团合作项目
【CateGory Index】: P618.31
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