Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 132-141.doi: 10.13278/j.cnki.jjuese.201501111

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Re-Os Isotopic Dating of Molybdenite from the Bainaimiao Cu(Mo) Deposit in Inner Mongolia and Its Geological Significance

Feng Xiaoxi1,2, Yao Shuzhen1, Duan Ming2, Qu Kai2, Wang Jiaying2, Feng Xubiao3, Li Chao4, Zhou Limin4   

  1. 1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;
    2. Tianjin Center, China Geology Survey, Tianjin 300170, China;
    3. Guanxin Mining Group of Shenzhen City, Shenzhen 518048, Guangdong, China;
    4. National Research Center of Geoanalysis, Beijing 100037, China
  • Received:2014-03-14 Published:2015-01-26

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Abstract:

The Bainaimiao Cu(Mo) deposit is the most important ones in the north margin of North China plate. It is composed of south belt and north belt. In south belt, ore bodies are concordant with ore-hosting green schist of the Cambrain Bainaimiao Formation, with near-bedded and lenticular shapes, the major bodies in north belt are located in granodiorite intrusion and partly extending into host rocks. The metallogenic age of this deposit has been disputed for many years. To dtermine the minerlization age, Re-Os isotopic dating of five molybdenite samples, separated from both south and north ore belt, are completed, five molybdenite samples yield isotopic model ages of (435.8±6.0) Ma to (443.0±6.1) Ma, and an isochron age of (440.5±4.4) Ma (2σ, MSWD=1.4). These ages are well concordant with the emplacement age (440.0 Ma) of the granodiorite. Combining with regional geological background and deposit characteristics, authors think synthetically that the deposit formed in Early Silurian and has close relationship with granodioritic (440.0 Ma) magmatic activities in Early Silurian. The mineralization age is also consist with the period (446.0-453.0 Ma) of the intensive southward subduction of the paleo-Asian oceanic plate beneath to the northern margin of the North China plate. By synthetical analysis, authors conclude that the major metallogenetic event were resulted from the evolution of the trech-basin-arc system and continent margin accretion in the North China plate during the Early Paleozoic epoch.

Key words: Re-Os age, molybdenite, metallogenic age, metallogenic setting, Inner Mongolia, Bainaimiao Cu(Mo) deposit

CLC Number: 

  • P618.3

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