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Zircon U-Pb Ages, Geochemistry and Hf Isotopes of Granitoids and Diorite in the Chengchao Fe Deposit in Southeastern Hubei Ore Cluster and Its Significance

Yao Lei1,Xie Guiqing2,Lü Zhicheng3,Zhao Caisheng4,Wang Jian1,Zheng Xianwei5,He Zhefeng6,Li Wei1   

  1. 1.Faculty of Sciences and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;
    3.Development and Research Center, China Geological Survey, Beijing100037, China;
    4.Technology and International Cooperation Division, Ministry of Land and Resources, Beijing100812,China;
    5.Chengchao Iron Mine of Wuhan Iron & Steel Group Minerals Co., Ltd, Ezhou436051, Hubei,China;
    6.Geological Museum of China, Beijing100812, China
  • Received:2012-11-23 Online:2013-09-26 Published:2013-09-26

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Abstract:

This contribution has carried out LA-ICP-MS zircon U-Pb dating, geochemistry and Hf isotopes. The ages of the granite, porphyritic quartz monzonite, diorite and porphyritic diabase in the Chengchao Fe deposit are dated at (128.8±0.5) Ma, (128.3±0.5) Ma, (140.0±0.3) Ma and (125.5±0.5) Ma, respectively, showing that granitoids and diorite of the Chengchao Fe deposit formed in Early Cretaceous. Geochemical analysis indicates that the granitoids in the deposit belong to metaluminous and Itype series; the diorite and porphyritic diabase are of nature of highK calcalkalic series. These igneous rocks in the Chengchao Fe deposit have high REE contents, characteristics of LREE enrichment, obvious LREE and HREE fractionation, and weakly negative Eu anomaly. The granitoids are all rich in Rb, Th, U and La, but considerably depleted in Ba, Nb and Sr; the diorite and porphyritic diabase are rich in K, La, Nd and poor in Ta, Nb, Sr, P, Ti. The Hf isotope compositions and geochemical characteristics indicate that these igneous rocks in the Chengchao Fe deposit formed from a magma source with lower, Neoproterozoic and Paleoproterozoic crustalderived contribution. Consistence between the metallogenic age of the Chengchao Fe deposit and the intrusion age of granitoids shows their close relations.

Key words: LA-ICP-MS zircon U-Pb dating, zircon Hf isotope, skarn Fe deposit, iron deposits, Chengchao Fe deposit, southeastern Hubei Province

CLC Number: 

  • P618.31
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