Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 416-428.doi: 10.13278/j.cnki.jjuese.20200069

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Geochemical Characteristics and Geological Significance of Diorite of Yu'erya Gold Deposit Area in Eastern Hebei Province

Yang Aixue1,2, Sun Deyou2, Hou Xuegang2,3, Wang Jiuliang1, Zhang Jilin4, Li Linwei4   

  1. 1. The Fifth Geology Company of Hebei Geology ﹠ Minerals Bureau, Tangshan 063000, Hebei, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China;
    3. Henan Academy of Land and Resources Sciences, Zhengzhou 450053, China;
    4. China National Gold Group Co., Ltd, Beijing 100010, China
  • Received:2020-03-23 Published:2021-04-06
  • Supported by:
    Supported by the Scientific Research Projects of China National Gold Group Co., Ltd(ZJ-DJ/2015-HBYEY)

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Abstract: Located in the eastern part of the Yanshan orogenic belt on the northern margin of the North China plate in eastern Hebei Province,Yu'erya is one of the main gold producing areas especially with hydrothermal gold deposits. The Yu'erya deposit is representative in eastern Hebei Province, which occurs mainly in the granite of the Jurassic Yu'erya pluton with a few orebodies in the Jurassic diorite that intruded into the granite. The geochemical data show that the w(SiO2) of diorites is 51.99%-61.88% and w(Na2O+K2O) is 5.07%-8.89%, with Mg# values between 0.37 to 0.64. They are high-potassium calc-alkaline and quasi-aluminum with A/CNK and A/NK values ranging from 0.73 to 0.96 and 1.37 to 2.26, respectively. All samples are rich in LREE and LILE including Rb, Ba, K,and Sr, and are depleted of HREE and HFSE such as Nb, Ta and Ti. The zircon Hf isotope studies show that the εHf(t) values of the diorites range from -16.5 to -6.5. These data indicate that the Jurassic diorite magma originated from the enriched lithospheric mantle replaced by subduction fluids, and was contaminated limitedly by the ancient lower crust material of the North China plate during magma upwelling. In the ore-forming period,the diorite magma provided part of the material for the gold mineralization. Combined with other regional results, this study suggests that the magmatism is likely associated with the subduction of the paleo-Pacific plate beneath Eurasia.

Key words: diorite, geochemistry, Hf isotope, petrogenesis, Yu’erya gold deposit

CLC Number: 

  • P588.13
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