中国地质2019，Vol.46Issue(1)：126-139,14.DOI:10.12029/gc20190108
藏南吉松铅锌矿成矿时代的厘定:热液绢云母Ar-Ar年龄
Hydrothermal sericite Ar-Ar dating of Jisong Pb-Zn deposit, Southern Tibet
摘要
Abstract
The Jisong Pb-Zn deposit is one of the newly found deposits in the Tethys Himalaya belt. Orebodies mainly occur as veins in several nearly NE-striking faults. The veins are mainly composed of quartz, calcite, and sulfides. Hydrothermal sericite is genetically associated with zinc and lead mineralization and coexists with quartz, calcite, pyrite, sphalerite and galena. These sericite grains were separated for Ar-Ar isotopes dating. The results yielded a plateau age of (16.61 ± 0.30) Ma at 760-860℃, with the corresponding isochron age being (16.64±0.30) Ma. These two ages are the same within the error, indicating that they can represent the formation age of the Jisong Pb-Zn deposit. Tethys Himalaya developed an Au (Ag) mineralization event in the main collisional orogenic setting, and the Ar-Ar age of the Jisong deposit indicates that Pb-Zn mineralization represented by Jisong in South Tibet occurred at late collisional stage. Combined with close spatial relationships as well as the similarities in time and Pb isotopes between the Jisong deposit and the Cuonadong leucogranite, the authors hold that the leucogranite possibly offered material and heat to the Jisong ore-forming hydrothermal system.关键词
特提斯喜马拉雅/吉松/Ar-Ar年龄/藏南/铅锌矿Key words
Tethyan Himalaya/Jisong/Ar-Ar dating/South Tibet/Pb-Zn deposit分类
天文与地球科学引用本文复制引用
梁维,郑远川..藏南吉松铅锌矿成矿时代的厘定:热液绢云母Ar-Ar年龄[J].中国地质,2019,46(1):126-139,14.基金项目
科技部国家重点研发计划(2016YFC0600308) （2016YFC0600308）
中国地质调查局项目"冈底斯-喜马拉雅铜矿资源基地调查"(DD20160015) （DD20160015）
国家自然科学基金项目(41702080)共同资助 （41702080）
