LA-ICP-MS Zircon U-Pb Dating of Narigongma Biotite Granite Porphyry in Northern Sanjiang Region and Its Geological Significance

详细信息   

• 责任者：Song Zhongbao (Xi′an Center of Geological Survey ; China Geological Survey ; Xi′an 710054 ; China) ; Jia Qunzi
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(2)
• 关键词：花岗斑岩 ; granite porphyry ; 铜矿 ; copper ores ; 钼矿 ; molybdenum ores ; 铀—铅计时 ; U-Pb dating ; 青海 ; Qinghai Province
• 页码：p.439-447
• 图表：4 illus., 2 tables, 20 refs.
• 分类号：1001
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

Narigongma biotite granite porphyry in northern Sanjiang region is an important porphyry type copper-molybdenum mineralization belt in Qinghai Province,and the Narigongma copper-molybdenum deposit is an intrusion-related porphyry type ore deposit recently discovered in northern Sanjiang region.The authors obtained the zircon U-Pb age of 41.53±0.24Ma for Narigongma biotite granite porphyry,which should belong to early Himalayan period.The main metallogenic age is between 40.86 and 40.8 Ma.In multi-phase hydrothermal superimposition and mineralization,the hydrothermal solution of the Narigongma porphyry copper-molybdenum deposit must have been derived from biotite granitite porphyry of 41.53±0.24 Ma and plagioclase granite porphyry of 41.0±0.18 Ma.In virtue of existence of many intermediate-acid intrusive rocks,the age determination of these intrusive is not only of theoretical importance but also of practical significance in search for porphyry type copper-molybdenum deposits of the same epoch.