沉积与特提斯地质2025，Vol.45Issue(3)：594-604,11.DOI:10.19826/j.cnki.1009-3850.2025.07004
西藏柯月铅锌锑多金属矿床成因再认识:对喜马拉雅后碰撞期铅锌锑成矿作用的启示
A reevaluation for the genesis of the Keyue Pb-Zn-Sb polymetallic deposit:Insights for Pb-Zn-Sb metallogenesis during the post-collisional Tethys Himalayan belt
摘要
Abstract
The Keyue Pb-Zn-Sb polymetallic deposit is located within the Zhaxikang-Cuonadong ore concentration area in the eastern segment of the Tethyan Himalayan mineralization belt,with its orebodies controlled by north-eastern extensional fault structures.The genesis of this deposit remains a subject of debate.In this study,Ar-Ar isotope geochronology and in-situ sulfur isotope analyses were conducted on sericite and metallic sulfides within quartz-sulfide veins.Plateau ages of sericite,obtained within the temperature range of 650℃-1 100℃,were determined to be(15.34±0.24)Ma,accompanied by corresponding isochron ages of(15.38±0.27)Ma.These results explicitly indicate that the mineralization of the Keyue Pb-Zn-Sb polymetallic deposit occurred approximately 15 Myr ago,during the post-collision stage of the Indian-Asian continental collision.The in-situ sulfur isotopic composition of metallic sulfides in the Keyue deposit exhibits remarkable stability with a narrow range,varying from 8.65‰ to 12.02‰(with an average of 10.85‰).Owing to its close resemblance to the sulfur isotopic composition of the Cuonadong leucogranite and Ridang Formation strata within the ore concentration area,it is suggested that the sulfur was derived from both Miocene leucogranitic magmas and the strata.Comprehensive research demonstrates that the Keyue Pb-Zn-Sb polymetallic deposit is a hydrothermal vein-type deposit closely associated with Miocene magmatic activity.Additionally,the Zhaxikang-Cuonadong ore concentration area displays distinct deposit zoning characteristics.With the Cuonadong leucogranite as the core,beryllium-tungsten-tin deposits related to Miocene leucogranitic magmatism develop.Moving outward,hydrothermal vein-type Pb-Zn-Sb polymetallic deposits occur,and at the outermost periphery,gold or gold-antimony deposits are present.This spatial arrangement collectively forms a typical magmatic-hydrothermal W-Sn-Be → Pb-Zn-Sb → Au polymetallic mineralization system.关键词
特提斯喜马拉雅/柯月铅锌锑多金属矿床/Ar-Ar年龄/成矿物质来源/岩浆-热液成矿系统Key words
Tethyan Himalayan mineralization belt/Keyue Pb-Zn-Sb polymetallic deposit/Ar-Ar mineralization age/ore-forming material sources/magmatic-hydrothermal mineralization system分类
天文与地球科学引用本文复制引用
杨毅,孙渺,李晓霞,史功文,高轲,王艺云,马国桃,董磊..西藏柯月铅锌锑多金属矿床成因再认识:对喜马拉雅后碰撞期铅锌锑成矿作用的启示[J].沉积与特提斯地质,2025,45(3):594-604,11.基金项目
中央引导地方科技发展资金项目(XZ202301YD0030C) （XZ202301YD0030C）
国家自然科学基金(41702080) （41702080）
中国地质调查项目(DD20240069,DD20242472,DD20230054,DD20230359,DD20211381,DD20242105) （DD20240069,DD20242472,DD20230054,DD20230359,DD20211381,DD20242105）
