Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 982-991.doi: 10.13278/j.cnki.jjuese.20180063

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Ore-Controlling Characteristics and Prospecting Criteria of Iron Deposits in Qihe Area of Western Shandong

Hao Xingzhong1,2, Yang Yiheng3, Li Yingping1, Gao Huali1, Chen Lei1   

  1. 1. Shandong Institute of Geological Survey, Jinan 250014, China;
    2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
    3. School of Applied Sciences, Beijing Information Science and Technology University, Beijing 100192, China
  • Received:2018-03-17 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported by Geological Survey Project of China Geological Survey (DD2016005223, DD20190166)

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Abstract: There are skarn iron deposits in Qihe County, Shandong Province. In recent years, a great progress has been made in iron ore exploration and research work in the study area. In order to promote the iron ore exploration in this area, the authors discussed the ore-controlling characteristics and prospecting criteria through statistical analysis of the iron ore exploration and research results in this area. The iron ore-controlling strata are the strata of the Ordovician carbonate rocks and Carboniferous-Permian clastic rocks. The ore-forming geological bodies are the medium-basic intrusive rocks in Late Yanshanian, and the iron ore bodies occur mainly in the contact zone of strata and rock mass, and also in some carbonate strata or the intrusive rocks. The occurrence types of iron ore are various, of which the contact belt is the main type, also including the types of fracture filling, interlayer filling, fissure penetration and xenoliths, etc. The ore bodies are complex in shape, such as layered, cystic, and lenticular. The typical alteration zoning is characterized by diorite-altered diorite-inner skarn-iron ore-outer skarn belt-marble belt-limestone. The mineralization is mainly composed of contact diffusion metasomatism and contact permeation metasomatism, including also some rich ore hydrothermal filling, etc. In this area, the iron ore prospecting criteria mainly include stratigraphic marks (Ordovician carbonate rocks and Carboniferous-Permian clastic rocks strata), intrusive rock marks (medium-basic intrusive rock mass with albitized alteration diorite), structure marks (contact zones between strata and rock mass, structure intersections, interlayer slips, brittle fractures), wall-rock alteration marks (magnetization, skarnization, albitization, serpentinization, phlogopization, etc.), and geophysical marks (obvious high value magnetic anomaly and polarization magnetic anomaly, gradient zone of gravity anomaly, high-low resistivity conversion zone). In iron ore exploration in the future, based on the comprehensive study of the ore-controlling characteristics in this area, a variety of prospecting indicators should be used to cooperate and complement each other so as to achieve the desired exploration goal.

Key words: western Shandong Province, Qihe, skarn, iron ore, ore-forming geological body, prospecting criteria

CLC Number: 

  • P618.31
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