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J4 ›› 2009, Vol. 17 ›› Issue (6): 34-38.

• article • Previous Articles     Next Articles

Geological and Geochemical Characteristics of Dashui Diorite-type Gold Deposit in Gansu Province

WANG Jinfang1，FENG Jingzhi1，WAN G Congying1，CHEN Wentao1，LI Hongyang1，YUAN Wanming2   

  1. 1.College of Resources，Shifiazhuang University of Economics，Shijiazhuang   050031，Hebei，China；
    2.State Laboratory of Geological Processes and Minerals Resources，Chinese Academy of Sciences,Beijing   100039，China
  • Received:2009-04-13 Revised:2009-05-25 Online:2009-12-30 Published:2011-07-15

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Abstract:

Dashui gold deposit occurs in the diorite and the contact zone as well as surrounding limestone．Diorite veins
and red—brown hematized limestone are widely distributing in the surface．Large amounts of fine disseminated and veinlet pyrites occur in the lower oxidized zone in the gold deposit．The Co/Ni ratios range from 1 to 5，close to the pyrite formed by magmatism．The REE pattern describes that gangue minerals are close to diorite veins，but quite diferent from limestone．Thus，REE geochemistry indicates that the ore-form ing materials mainly came from diorite veins closely related to tectono—magmatism．The 634S values of pyrite range from -1.8‰ to +4.1‰ with a mean of +2.4‰．reflecting a deep source of sulfur．Samples analyzed for hydrogen and oxygen isotopic compositions of the calcites oreforming fluids were mainly magmatic water，and might be the product of mixing of meteoric water and magmatic water at the late mineralization stage．Studies on geological and geochemical characteristics show that Dashui gold deposit derived its ore-forming materials from the hosted diorite，the ore·fluids were largely magmatic water，as sulfides·rich diorite-type gold deposit．

Key words: Dashui gold deposit, Diorite-type, Geological and geochemical characteristics, Gansu province

CLC Number: 

  • P618.51


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