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Geoscience ›› 2018, Vol. 32 ›› Issue (06): 1227-1241.DOI: 10.19657/j.geoscience.1000-8527.2018.06.11

• Petrology • Previous Articles     Next Articles

Mineral Chemistry of Husite Pluton in West Tianshan, Xinjiang and Its Implications for Petrogenesis and Mineralization

HE Yu1(), ZHANG Yongmei1,2(), GU Xuexiang1,2, PENG Yiwei3, CHENG Wenbin3, WANG Guannan1, WAN Yu4, YUAN Peng4   

  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. College of Earth Sciences, Chengdu University of Technology, Chengdu,Sichuan 610059, China
    4. No.7 Geological Team, Xinjiang Bureau of Geology and Mineral Resources, Usu,Xinjiang 833000, China
  • Received:2018-01-11 Revised:2018-04-19 Online:2018-12-10 Published:2018-12-20

Abstract:

The Husite pluton is situated on the middle-northern margin of the Boluokenu island arc in the West Tianshan, Xinjiang, and is a typical skarn mineralization-related intermediate-felsic intrusive complex in the eastern Boluokenu ore belt. In this paper, we systematically studied the mineral chemistry of monzogranite, granodiorite and mafic enclaves from the Husite pluton, and discussed the magmatic evolution and the relationship between mineral composition and petrogenesis and metallogenesis. Rock-forming mineral compositions show that the Husite granites are typically I-type formed in a continental arc setting, and was mainly derived from partial melting of the lower crust with mantle-derived input. The Husite pluton was formed under relatively high temperature (738-770 ℃), low pressure (0.57-1.42 kbar) and oxidizing environment. The shallow emplacement (2.2-4.2 km deep) of oxidized monzogranitic and granodioritic magmas likely facilitated the Kekesala-Aimusidaiyi Fe-Cu ore formation. The Mg-enrichment and high oxidation coefficient of biotite, and the Mg-Si-enrichment and wide compositional range of amphibole in these rocks are both compositional features related to Fe-Cu mineralization. Magma mixing may have been closely related to the ore formation, and is also indicative for porphyry-skarn polymetallic prospecting in the region.

Key words: mineral chemistry, petrogenesis, mineralization significance, Husite pluton, West Tianshan, Xinjiang

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