Abstract:  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 orebearing 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.

Key words:  font-size: 10.5pt">Tethyan Himalaya;Jienagepu gold deposit, Zhaxikang;metallogenic system;Arfont-size: 10.5pt" face="宋体">-Ar dating

摘要：  姐拉各普金矿是藏南扎西康矿集区内最新发现的金矿床，为了解该矿床的成矿时代，探讨其成矿机制，对金矿床中含矿石英脉中绢云母开展Ar-Ar年代学测试，以及氢氧同位素示踪，并与矿集区内铅锌金锑矿床开展对比研究。分析结果表明，姐纳各普金矿成矿时代为17.6±1.8 Ma，与矿集区内铅锌金锑成矿时代，以及错那洞穹窿中淡色花岗岩和伟晶岩形成时代相一致。结合同位素示踪，本文认为扎西康矿集区铅锌金锑成矿系统受错那洞片麻岩穹窿控制，形成时代主要集中在16.6~18.7 Ma，中新世岩浆活动提供的热量驱动地下水循环，并萃取地层或喜马拉雅基底成矿物质，在少量岩浆流体及成矿物质的参与下，沿南北向及其次级断裂构造部位上移聚集成矿，构成穹窿—岩浆—地层—构造四位一体的控矿系统。

关键词:  font-size: 10.5pt" face="宋体">特提斯喜马拉雅；姐纳各普金矿；扎西康；成矿系统；font-size: 10.5pt">Arfont-size: 10.5pt" face="宋体">-Arfont-size: 10.5pt" face="宋体">年龄