• 责任者：Yang Fan (Department of Land Resources Engineering ; Kunming University of Science and Technology ; Kunming 650093 ; China) ; Zou Guofu
• 刊名：Geotectonica et Metallogenia
• 出版年：2011
• 卷期：35(2)
• 关键词：铜矿 ; copper ores ; 云南 ; Yunnan Province
• 页码：p.307-314
• 图表：7 illus., 3 tables, 31 refs.
• 分类号：1001
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

The Chundu porphyry copper deposit is located at the southern part of the western branch of the Zhongdian copper-polymetallic metallogenic belt. The diorite-porphyrite and granodiorite-porphyry are chronologically dated using zircon LA-ICP-MS U-Pb method.  The zircon grains are light yellow to colorless transparent, tetragonal bipyramid crystals, showing regular rhythmic banding in the cathodoluminescence images which are typical for zircons of magmatic origin. The LA-ICP-MS zircon U-Pb analyses yield ages of (212±3) Ma (sample B-9, n=13, MSWD=0.23, Th/U ratios of 0.51～0.98) for the diorite-porphyrite, (217±2) Ma (sample B-28, n=21, MSWD=0.31, Th/U ratios of 0.54～3.76) and (218±2) Ma (sample E-9, n=20, MSWD=0.31, Th/U ratios of 0. 5～1.16) for the granodiorite-porphyry respectively. The results show that the Chundu granite was formed in the Late Triassic, a period (237～208 Ma) of massive magmatic activity in the Yidun arc.