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GEOLOGY AND MINERALIZATION DATING OF JIENAGEPU GOLD DEPOSIT IN SOUTHERN TIBET WITH IMPLICATION FROM ZHAXIKANG
DONG Sui liang, HUANG Yong, LI Guangming, et al.
Resources & Industries
2017, 19 (5):
56-64.
DOI: 10.13776/j.cnki.resourcesindustries.20171106.003
Jienagepu gold deposit is the latest discovery in Zhaxikang ore concentrating area in southern Tibet. This paper, aiming at studying its mineralization age and mechanism, dates the sericite's Ar-Ar ages in orebearing quartz vein, and H & O isotopes tracking, and compares the results with Pb-Zn-Au-Sb deposits within the same area. Result shows that mineralization age of Jienagepu gold deposit is 17.6±1.8 Ma, the same as the Pb-Zn-Au-Sb deposits and as light-colored granites and pegmatites in Cuonadong dome. Combined with H & O isotopes tracking, this paper thinks Pb-Zn-Au-Sb metallogenic system in Zhaxikang ore concentrating area is controlled by Cuonadong gneiss dome with mineralization age at 16.6~18.7 Ma. The Miocene magmatic events provided heat to drive the underground water circulation and extracted the mineralizing elements from strata or Himalaya, mixed with a small quantity of magmatic fluid and mineralizing elements, migrated along SN-striking faults and concentrated to form the deposit, forming a four-in-one dome-magma-strata-structure ore controlling system.
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