Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 412-424.doi: 10.13278/j.cnki.jjuese.201602110

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Geological Characteristics, Genesis, and Its Prospecting Exploration Enlightenment of Lanzhichang Iron Deposits in the Emeishan Large Igneous Province

Zeng Linggao1,2, Zhang Jun2, Sun Teng2, Li Bin1, Zhu Guanghui1, Jia Zichao1, Fang Quan1, Chen Genghu3   

  1. 1. No. 9 Geological Brigade, Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830000, China;
    2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;
    3. Metallurgical and Geological Exploration Institute of Sichuan Province, Chengdu 610051, China
  • Received:2015-10-12 Published:2016-03-26
  • Supported by:

    Supported by the Crisis Mines Prospecting Special Projects of China(20109904)

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Abstract:

Lanzhichang iron deposit is the first medium-scaled iron deposit ascertained in a basalt construction of the Emeishan large igneous province. The deposit has a close spatial-temporal and genesis relationship with the basalt construction that is significantly of synsedimentary stratabound mineralization characteristics. The orebodies mainly occurred in the contact zone between the basaltic breccia basalt and the compact massive basalt of the lower section of Emeishan basalt controlled by Kuangshanliangzi caldera structure with multi-layers, and the ores developed fabric structure such as strawberry-like structure, rhythmic and laminar structures, banded structure, dense massive structure, rope structures, brecciated structure and so on, as well as iron tuberculosis and iron jasper. The major and trace elements of rock and ore show that the mineralization was affected by the hydrothermal sedimentary, magmatic evolution following the Fenner differentiation trend. The geological and geochemical characteristics indicate that Lanzhichang iron deposit is a continental syndepositional iron ore deposit with volcanic eruption or overflow. The discovery of this new type of iron deposit is a breakthrough to the ideological restraint in China that no such scaled iron deposit can be found in an igneous area. It provides a lot of inspirations and references for looking for iron ore in similar geological environments.

Key words: prospecting exploration enlightenment, Lanzhichang iron deposit, geological characteristics, deposits genesis, Emeishan large igneous province, basalt

CLC Number: 

  • P618.31

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