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Zircon LA-ICP-MS U-Pb Chronology and Its Genetic Significance of Yindu Ore-Bearing Intrusion, in the West Slope of Great Xing’an Range

Mei Wei1, Lü Xinbiao1,2, Cao Xiaofeng1, Tang Rankun1, Wang Xiangdong1, Zhang Lei1, Song Shuang1, Zhao Yan1   

  1. 1.Faculty of Earth Resources, China University of Geosciences, Wuhan430074, China;
    2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan430074,China
  • Received:2014-01-12 Online:2014-09-26 Published:2014-09-26

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Abstract:

The Yindu deposit, a silver polymetallic deposit of hydrothermal vein-type controlled by faults, is located in the west slope of Great Xing’an Range, Inner Mongolia. The magmatic body is quartz diorite in this mining area, in which the zircons are divided into magmatic ones and hydrothermal one. The magmatic zircons are colourless, transparent, euhedral columnar, with the characteristics of oscillatory zoning, whereas hydrothermal zircons are light brown, translucent-opaque, equiaxed, with its dark hyperplasia edge cutting significantly over the nuclear of magmatic zircons. Hydrothermal zircons are characterized by low values of Th/U and LREE, and high values of Hf and HREE, relative to magmatic zircons.206Pb/238U weighted mean age of magmatic zircons is （451.8±7.8） Ma in Yindu District. It belongs to the Caledonian, representing the crystallization age of the Yindu rock.206Pb/238U weighted mean age of hydrothermal zircons is （337.0±7.7） Ma. It belongs to the Middle Carboniferous, representing the hydrothermal age. It was indicated that there is a strong hydrothermal process in the mining area around 337 Ma. The hydrothermal process may be related to the peakmetamorphism of orogeny in the area. Accoring to the regional geological characteristics and fluid inclusion characteristics, it was shown that the formation of silver ore is likely closely related to this hydrothermal activity in the mining district.

Key words: Yindu rock, hydrothermal zircon, U-Pb age, metamorphic-hydrothermal fluid, polymetallic deposits, Great Xing’an Range

CLC Number: 

  • P618.52
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