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Gold Science and Technology ›› 2012, Vol. 20 ›› Issue (5): 1-15.

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Geological Characteristics and Genesis of Intrusion-related Bilihe Large Gold Deposit，Inner Mongolia

GE Liangsheng1，2，3，ZHANG Wenzhao1，QING Min1，HAO Baiwu1，2，3   

  1. 1.Gold Geological Institute of CAPF，Langfang   065000，Hebei，China；
    2.Institute of Geology,Chinese Academy of Geological Sciences，Beijing    100037，China；
    3.State Key Laboratary of Geological Process and Mineral Resouce,China University of Geoscience，Beijing   100083，China
  • Received:2012-06-28 Revised:2012-08-26 Online:2012-10-29 Published:2013-04-03

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Abstract:

Bilihe gold deposit in Inner Mongolia is located in the northern margin of the North China Craton Paleozoic accretionary zone，which is important area of Sn-Mo mineralazation area in the northern China.Intrusion related to mineralization intruded into the volcanic rocks， is the main ore-forming rock formed in the northern margin of the late Paleozoic active continental North China Craton’s edge of accretionary-collisions transition setting,composed of granodiorite （porphyry） rock（272 to 269 Ma）.The main ore bodies as consealed state lie in the granodiorite rock body and the contact zone between the granodiorite and wall rock.Ore grade from the terrane’scenter to its outer gradually depleted.Ores mainly make up of granodiorite porphyry with a large number of sheeted auriferous quartz veins，stockworks and the typical unidirectional solidifition texture（UST） in contact，and a positive correlation with the gold grade.Metal sulphide content of the ore is very low（less than 2%）.Alterations are first potassium and silicifiedand second kaolin in the intrusion，and widely illitization propylitization outer.Geochemical Character of Au±Bi±Te±W±As±Sn±Cu±W±Mo is similar to the intrusion-related gold deposits. Ore-bearing  quartz fluid is an aqueous solution containing CO2，with the native homogenization temperature of 430~550 ℃ and less than 380 ℃ and salinity of 0.88%~8.68% NaCl and 12.5%~17.5% NaCl.The study showed that the early ore-forming fluids come from the magma，and have varying degrees of precipitation with the uplift of the mineralization space and the mineralization process.Geochronology studies have shown that the molybdenite Re-Os isochron age of the granodioritic porphyry is 272.7±1.6 Ma，mineralization began in the late of the granodiorite magma.Deposit characteristics show that Bilihe gold deposit conforms to the across Eurasia global intrusion-related gold mineralization，and is a typical representative of the same type gold deposits in China.

Key words: Large gold deposit, Intrusion-related, Geological characteristics, Ore genesis, Bilihe, Inner Mongolia

CLC Number: 

  • P618.51
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