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《地质学报(英文版)》 2016-06
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Zircon U-Pb-Hf Isotopic Systematics and Geochemistry of the Granites in the Wurinitu Molybdenum Deposit,Inner Mongolia,China: Implications for Tectonic Setting and Genetic Type of Mineralization

ZHANG Zhenjie;CHENG Qiuming;YAO Lingqing;BAI Huishan;LI Cheng;School of Earth Sciences and Resources,China University of Geosciences;State Key Laboratory of Geological Processes and Mineral Resources (GPMR),China University of Geosciences;  
The Wurinitu Mo deposit is one of the newly found molybdenum deposits in the southwestern part of the late Paleozoic–Mesozoic Erenhot–Dong-Ujimqin metallogenic belt(S-EDMB),Inner Mongolia,China. In the present study,the mineralization age of the Wurinitu deposit is constrained to 137.3 ± 1.3 to 131.9 ± 1.5 Ma based on a combination of the laser ablation–inductively coupled plasma–mass spectrometry(LA–ICP–MS) zircon U–Pb dating of the mineralization related fine-grained monzonitic granite and the post-mineralization granite porphyry. The results of zircon Lu–Hf isotopes,combined with the geochemical characteristics of the granites in the S-EDMB,suggest that the Wurinitu Mo deposit was formed in an extensional environment in relation to the subduction of the Paleo-Pacific plate in late Mesozoic. The Wurinitu deposit shares similarities with the classical Climaxtype porphyry molybdenum deposits in tectonic setting,mineral assemblages,and metal zonation.
【Key Words】: Wurinitu deposit U–Pb dating Lu–Hf isotopes geodynamic backgrounds of mineralization Climax-type
【Fund】: the joint financial support from the National Natural Science Foundation of China(No 41302263);; a research project on “Quantitative models for prediction of strategic mineral resources in China”(201211022)by China Geological Survey
【CateGory Index】: P618.65;P597
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