Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (5): 1365-1377.doi: 10.13278/j.cnki.jjuese.20170186

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Zircon U-Pb Age and Hf Isotopic Composition of the Biotite Plagioclase Hornblende Gneiss of Shujigou Cu-Zn Deposit, Liaoning Province

Zhang Peng, Kou Linlin, Zhao Yan, Bi Zhongwei   

  1. Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, China
  • Received:2017-12-10 Published:2018-11-20
  • Supported by:
    Supported by National Natural Science Foundation of China (41502093) and Project of China Geological Survey(DD20160049)

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Abstract: Located in the Archean granite-greenstone belt, the Shujigou copper-zinc deposit belongs to the volcanic-associated massive sulfide deposit (VMS). In this study, the authors carried out a comprehensive study including zircon U-Pb dating, petro-geochemical investigation, and Hf isotope analysis of the biotite plagioclase hornblende gneiss from the Shujigou copper-zinc deposit output. The LA-ICP-MS zircon U-Pb chronology indicated that the biotite plagioclase hornblende gneiss was formed at ca. (2 549.4±5.6) Ma, representing approximately the ore-forming age. Geochemically, the biotite plagioclase gneiss is characterized by its LREE enrichment, HREE depletion, and also the LILEs enrichment and HFSEs depletion, and the original rocks were of a set of island arc environment volcanic-sedimentary assemblage. According to the zircon Hf isotope analysis, the εHf(t)values of biotite plagioclase gneiss are 5.0-8.7, and the single stage model age (TDM1) varies from 2 527 Ma to 2 649 Ma. These characteristics suggest that the primary magma was derived from a depleted mantle, and the Shujigou area occurred in crustal growing during the Late Neoarchean. Combined with the geochemical characteristics and the evolution of the host rock, the mineralization involved in partial melting of the mantle and forming of a rich base metal magma, and went through plate subduction, magma migration, convergence and eruption til the formation of base metals igneous rocks in the study area. The percolation of seawater down into these igneous rocks and leaching the metals from them into feeder zones formed the VMS deposit system. The fluids within this feeder system were erupted at the seafloor; these magmas focused along the faults, and the minerals were precipitated at the contact zone between these metal-laden fluids and the bottom cold seawater, and subsequently underwent the metamorphism and deformation.

Key words: zircon U-Pb age, Hf isotope, Shujigou Cu-Zn deposit, biotite plagioclase hornblende gneiss, Liaoning Province

CLC Number: 

  • P588.3
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