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Mineral Exploration and Resource Evaluation

Study on Geochemical Background Field of the Gold Deposits in Jiaodong,China

  • Yumin CHEN ,
  • Qingdong ZENG ,
  • Zhifu SUN ,
  • Zhaokun WANG ,
  • Hongrui FAN ,
  • Fengli XIAO ,
  • Shaoxiong CHU
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  • 1. Shandong Gold Group Co. ,Ltd. ,Jinan 250101,Shandong,China
    2. Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
    3. Innovation Academy of Earth Science,Chinese Academy of Sciences,Beijing 100029,China
    4. College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China
    5. Shandong Gold Geology and Mineral Exploration Co. ,Ltd. ,Laizhou 261400,Shandong,China

Received date: 2019-08-22

  Revised date: 2019-10-28

  Online published: 2019-12-24

Abstract

Jiaodong gold ore-concentrating area is the third largest gold mining area in the world after the Lande gold mining area in South Africa and Muruntau gold mining area in Uzbekistan,and its proved gold resources exceed 4 500 t.Jiaodong gold ore-concentrating area formed in the Early Cretaceous tectonic regime transition period and has the characteristics of large-scale concentrated mineralization.This area is composed of a lot of super-large,large gold deposits and includes altered rock type,quartz vein type and interlayer fracture zone type gold deposit.The typical altered rock type gold deposits are Sanshandao,Jiaojia,Xincheng,Dayingezhuang,Xiadian and Dongfeng 171 deposits,and so on.The quartz vein type gold deposits include Linglong,Jinqingding and Denggezhuang deposits,and so on.The interlayer fracture zone type gold deposits are represented by the Pengjiakuang gold deposit.These gold deposits are mainly controlled by the regional faults,secondary faults and interlayer slide faults along the northern margin of the Laiyang basin.The gold deposits in Jiaodong mainly occur within the Mesozoic granite,minor whthin Jiaodong Group,Jingshan Group and Mesozoic strata.This paper selects the scientific problem of the source of ore-forming materials,and systematically analyzes the surface and deep-drilling samples sampled from the Jiaodong area by means of Au element geochemical analysis,in order to reveal the geochemical background characteristics of Au element in this area,and provides geochemical field constraints for discussing the metallogenic mechanism of high-intensity massive accumulation of Au element in this area.The results show that the average abundance of Au element (1.10×10-9) of the Jiaodong group is lower than that of Clark value of continental crust (1.21×10-9) and the value of continental crust of North China Platform,which shows the characteristic of gold deficit geochemical field.Moreover,the results also show that the gold geochemical background feild of the Jiaodong group is characterized by higher average Au abundance in the central area (1.35×10-9) and lower average Au abundance in the east and west of the Jiaodong area (0.95×10-9 and 0.76×10-9).The average abundance of Au element in the fresh rock samples of different rock types (Jiaodong Group,0.79×10-9;Mesozoic granites,0.77×10-9;Gabbro,0.63×10-9;Lamprophyre,0.93×10-9;Acidic dykes,0.82×10-9) from the deep drilling holes is lower than that of Clark value of continental crust and the value of continental crust of North China Platform,which also display the characteristic of gold geochemical deficit field.Therefore,there exists an Au element geochemical deficit field in the Jiaodong ore-concentrating area,combined with the evidence of hydrothermal activities in gold ore areas,we think the Jiaodong Group and the Mesozoic granite might partly provide the source of metallogenic materials for the formation of gold deposits in the Jiaodong area.

Cite this article

Yumin CHEN , Qingdong ZENG , Zhifu SUN , Zhaokun WANG , Hongrui FAN , Fengli XIAO , Shaoxiong CHU . Study on Geochemical Background Field of the Gold Deposits in Jiaodong,China[J]. Gold Science and Technology, 2019 , 27(6) : 791 -801 . DOI: 10.11872/j.issn.1005-2518.2019.06.791

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