• 责任者：Ren Jiangbo (State Key Laboratory of Isotope Geochronology ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Xu Jifeng
• 刊名：Acta Petrologica Sinica
• 出版年：2011
• 卷期：27(9)
• 关键词：斑岩矿床 ; porphyry deposit ; 铀—铅计时 ; U-Pb dating ; 云南 ; Yunnan Province
• 页码：p.2591-2599
• 图表：4 illus., 3 tables, 45 refs.
• 分类号：1300
• 出版序号：1923
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

 Hypabyssal porphyries associated with porphyry copper deposits are widely distributed in Zhongdian island arc in the northwest of Yunnan Province. The LA-ICPMS zircon U-Pb method is used to date the formational age of the porphyries in western and eastern side of the Zhongdian island arc. Zircons separated from Xuejiping ore-bearing porphyry in the western side of Zhongdian yielded mean ²⁰⁶Pb/²³⁸Pb ages of (213.4±1.5) Ma. Meanwhile zircons separated from Qiansui quartz dioritic porphyrite in the eastern side of Zhongdian yielded mean ²⁰⁶Pb/²³⁸Pb ages of (217.1±1.5) Ma. These ages are consistent with those of high-precision zircon geochronology reported by other porphyries in this area, which indicate that they are coeval and without obvious different ages between western and eastern side porphyries in the Zhongdian island arc.