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Geoscience ›› 2017, Vol. 31 ›› Issue (02): 209-224.

• Mineralogy, Petrology and Mineral Deposit • Previous Articles     Next Articles

Geochronology, Geochemistry and Geological Significance of Host Rocks in the Jiamante Gold Deposit, West Tianshan, Xinjiang

ZHENG Shaohua1(), GU Xuexiang1,2(), ZHANG Yongmei1,2, WANG Chunshan3, MA Haijie3, HU Yaohua3   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
    2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
    3. No.703 Geological Party, Xinjiang Geological Exploration Bureau for Nonferrous Metals, Yining,Xinjiang 835000, China
  • Received:2016-09-23 Revised:2016-12-30 Online:2017-04-10 Published:2017-04-25

Abstract:

The Jiamante gold deposit is a typical epithermal gold deposit located in the Boluokenu polymetallic belt in the West Tianshan.It occurs in Late Paleozoic Dahalajunshan Formation mainly composed of crystal tuff and granitic porphyry. The LA-ICP-MS zircon U-Pb dating yielded a weighted average age of (365.9±3.0) Ma for crystal tuff and (362.3±4.3) Ma for granitic porphyry.The mineralization age of the Jiamante gold deposit could be constrained between 362 Ma and 331 Ma based on geochronological work in the study and considering the fossils of the Visean period in Lower Carboniferous Aqialehe Formation.Geochemical analysis results indicate that these magmatic rocks show high K calc-alkaline characteristics with enrichment in LREE, Rb, Th, K, and depletion in Sr, Ba, HREE, Nb, Ta, Ti and P. It suggests that crystal tuff and granitic porphyry have the characteristics of arc magmatic rocks. Crystal tuff and granitic porphyry were generated due to the southward subduction of the Junggar Ocean beneath the Yili-Middle Tianshan plate.They were likely derived from partial melting of mafic lower crust, with involvement of mantle-derived magma interacted with subducted sediments.

Key words: crystal tuff, granitic porphyry, zircon U-Pb age, geochemistry, Jiamante gold deposit, Xinjiang

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