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The Genesis of the Ore-Bearing Porphyry of the Tuoketuo Porphyry Cu-Au(Mo) Deposit in the East Kunlun, Qinghai Province：Constraints from Zircon U-Pb Geochronological and Geochemistry

Xia Rui1,2, Qing Min2, Wang Changming1, Li Wenliang2   

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2.Institute of Gold Geology, Chinese Armed Police Force, Langfang065000, Hebei, China
  • Received:2014-01-13 Online:2014-09-26 Published:2014-09-26

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Abstract:

The East Kunlun orogenic belt is one of the important areas of porphyry deposits in China. The authors report situ zircon U-Pb age and whole-rock geochemistry data for the ore-bearing porphyry in the Tuoketuo Cu-Au(Mo) deposit, which contrainted the processes of magmatism and mineralization. Zircon U-Pb dating indicates that the ore-bearing porphyries were emplaced at 232 Ma. These ore-bearing porphyry rocks have high SiO2 contents(63.11%-71.78%), high K contents(2.62%-3.61%), high MgO contents(0.52%-1.89%), and low Ti2O contents(0.26%-0.53%) contents, with aluminum saturation index(A/CNK) of 1.05-1.10. They are enriched in LILEs(Rb, Ba, K and Pb), depleted in HFSEs(Nb, Ta, Ti and P), metaluminous and high K calc-alkaline, ranging from granodiorite to monzogranite in I rock type. It is suggested that the Tuoketuo Cu-Au(Mo) deposit is possibly related to extensional regime, which result from the break-off of the slab during the northward subduction of Animaqing Ocean lithosphere.

Key words: zircon U-Pb age, geochemistry, porphyry Cu-Au(Mo) deposit, Tuoketuo, Qinghai

CLC Number: 

  • P618.41
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