40Ar/39Ar Dating of Sericite from Xialong Pb-Zn-Ag Deposit and Its Geological Significance
详细信息
- 责任者：Zhao Xiaoyan (School of Geosciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Yang Zhusen
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(5)
- 关键词：铅锌矿床 ; lead-zinc deposit ; 银矿 ; silver ores ; 氩—氩计时 ; Ar-Ar dating ; 西藏 ; Tibet
- 页码：p.963-971
- 图表：4 illus., 1 table, 63 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
Lying between Bangonghu-Nujiang suture zone and Yarlung Zangbo suture zone,the Gangdise metallogenic belt of Tibet can be divided into three metallogenic subbelts,which are from north to south LeqinglaDongzhongsongduo Pb-Zn-Ag polymetal metallogenic subbelt,Qulong-Jiama-Bangpu porphyry Cu-Mo metallogenic subbelt and Kelu-Chongmuda porphyry-skarn Cu-Mo-Au metallogenic subbelt.The Qulong-Jiama-Bangpu metallogenic subbeltis mainly characterized by porphyry Cu-Mo mineralization,with some depositswithin it also having Pb-Zn mineralization.The Xialong deposit is located in the west of the Qulong-Jiama-Bangpu metallogenic subbelt and occurs in the biotite monzonitic granite,belonging to the cryptoexplosive brecciated Pb-Zn-Ag deposit.40Ar/39Ar dating of sericite that is highly related to mineralization yielded the plateau age and isochronage of(23.56±0.22)Ma and(23.9±1.6)Ma respectively.The successful discovery of the Xialong deposit and the migration characteristics of Gangdise volcanic rocks from west to east indicate that there existed magmatism in the west of Gangdise metallogenic belt.The precise determination of the age of the Xialong deposit results in the westward extension of the Qulong-Jiama-Bangpu porphyry Cu-Mo metallogenic subbelt for 120 km, which increases the potential of ore prospecting in the Qulong-Jiama-Bangpu metallogenic subbelt and provides the theoretic and actual foundation for exploring Pb-Zn-Ag mineral commodities in this subbelt.