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J4 ›› 2012, Vol. 20 ›› Issue (3): 23-30.

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Fluid-structure and Mineralization of Xincheng Gold Deposit in Jiaodong Area

XIA Rui1,2,Guo Chunying1,2,Guo Xiaodong1   

  1. 1.Gold Geological Institute of CAPF,Langfang   065000,Hebei,China;
    2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China
  • Received:2012-02-05 Revised:2012-04-22 Online:2012-06-28 Published:2012-11-12

Abstract:

Xincheng gold deposits mainly develop the orebodies of the altered rock type(No.Ⅰ orebody) and quartz vein type(No.Ⅴ orebody).As the genesis research in gold deposit of Jiaodong peninsula advance further,investigation for the metallogenic process and resource potential in the Xincheng gold deposit is more and more significant.The results showed that the ore-forming fluid of altered rock type orebodies is mainly middle-low temperature with homogenization temperature from 376 ℃to 124 ℃,low salinity(NaCl eqv.) from 5.0% to 10.5%, low density with density from 0.787 g/cm3to 0.985 g/cm3,metallogenic depeth from 0.03 km to 12.86 km. The ore-forming fluids of quartz vein type orebodies mainly in middle temperature with homogenization temperature from 332 ℃ to 191 ℃,low salinity(NaCl eqv.) from 4.0% to 8.5%,low density from 0.814 g/cm3 to 1.013 g/cm3, metallogenic depth from 1.33 km to 11.42 km.The identical magma and fluid metallogenic system generated the mineralizing types of No.Ⅰ and No.Ⅴ orebodies under different physicochemical conditions,displaying that with the process of mineralization, ore-forming took place from the fault, through the contact between steep-angle fault in deep and low-angle fault in shallow,to the distal wallrock outward,and the effect of wallrock intensified gradually and the evolution of mineralizing type formed quautz vein type at first,then quartz vein type-quartz mixed,finally,altered rock type dominantly.Metallogenic model of the Xincheng gold deposit is built up,showing that the deposit consists different kinds of mineralizing types and metallogenic models.

Key words: Fluid inclusion, Fluid-structure, Jiaodong area, Xincheng gold deposit

CLC Number: 

  • P618.51

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