Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 736-748.doi: 10.13278/j.cnki.jjuese.201603111

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Petrogenic Age and Magma Source of Granite Porphyry in Lishanling Porphyry Cu Deposit in Changshan Area, Zhejiang Province

Wang Keqiang1,2,3, Zhang Dehui1,2, Zhu Yudi4, Fu Fen1,2, Yin Xianbo5, Wang Chensheng6   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;
    3. Beijing Oriental Yanjing Mining Design Co., Ltd., Beijing 100070, China;
    4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    5. Tibet Jinlong Incorporated Co., Ltd., Lasa 850000, China;
    6. China Non-Ferrous Metal Resource Geological Survey, Beijing 100012, China
  • Received:2015-10-12 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by the Ministry of Land and Resources(201411024) and National Natural Science Founda of China(41373048)

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Abstract:

Zhejiang is well known for its abundant non-metallic mineral resource, whereas is lack of research data on metallic deposits, especially on the porphyry deposits. The Lishanling porphyry Cu deposit has been chosen as a study object, the SHRIMP zircon U-Pb dating is applied to restrict the emplacement age of Lishanling granite porphyry. Sr-Nd isotope tracing is completed to study the origin of granite porphyry. The research result not only can enhance the study on ore genesis of porphyry deposits in Zhejiang, but also is vital important for further ore exploration in western Zhejiang. The Lishanling porphyry Cu deposit is located in the east of Qinzhou-Hangzhou suture zone, and the copper mineralization occurs within the granitic porphyry. The ore-bearing porphyry is classified as the S-type granite with high silica, alkaili content, strong fractionation, and peraluminous characteristics. In the chondrite-normalized diagram, the REE patterns lean to the right, appears as a seagulls, the enrichment of LREE and negative Eu anomalies are abvious. The porphyry is rich in Nb, Ta, Zr, Hf, Ti, Y, Yb; and depleted of LILEs such as Sr and Ba. Zircon SHRIMP U-Pb age of ore-bearing granite porphyry is (131±2) Ma, which proves that the porphyry was resulted from the Early Cretaceous tectonic-magmatic activity and formed in the tectonic background of lithospheric thinning in Eastern China. The ore-bearing porphyry has relative high value of ISr(0.679 95 to 0.721 08) and low εNd(t) value (-8.4 to -5.8), with the average value of 0.701 14 and -6.7 respectively. The ore-bearing granite porphyry mainly origin from crustal rock with a small amount of mantle contamination, which can be proved by the Sr-Nd isotopic characteristics.

Key words: porphyry Cu deposit, granite porphyry, Sr-Nd isotopes, zircon SHRIMP U-Pb age, Lishanling in Changshan area of Zhejinag Province

CLC Number: 

  • P597

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