Zircon U-Pb Geochronology of the Taohuacun Porphyry, Middle Part of the Jinshajiang-Ailaoshan Shear Zone, and Its Geological Significance
详细信息
- 责任者：Mao Xiaochang (China Geological Survey ; Beijing 100037 ; China) ; Yin Fuguang
- 刊名：Journal of Mineralogy and Petrology
- 出版年：2012
- 卷期：32(3)
- 关键词：二长花岗岩 ; monzogranite ; 铀—铅计时 ; U-Pb dating ; 金沙江 ; Jinsha River ; 哀牢山 ; Ailao Mountains
- 页码：p.70-76
- 图表：3 illus., 2 tables, 31 refs.
- 分类号：0801
- issnNo：ISSN1001-6872
- isbnNo：CN51-1143/TD
摘要
The Taohuacun porphyry is located at the middle part of the Jinshajiang-Ailaoshan alkaline-rich porphyry belt.In this paper,the Jianchuanbei porphyry is studied by means of petrography,U-Pb geochronology and rare earth element(REE) of zircons.Petrography study reveals that there are clinopyroxene in thin section,suggesting some special petrogenetic information.The zircon U-Pb geochronology indicates that the age of the Taohuacun porphyry is 35.9 Ma±0.5 Ma(MSWD=2.2,n=14),agree with the age of Cenozoic alkaline-rich porphyry in Jianchuan-Beiya area,and synchronous with most of the porphyry within the Jinshajiang-Ailaoshan alkaline-rich porphyry belt as well.Together with other geological evidence,it is believed that the petrogenesis of the Taohuacun porphyry was closely related to the strike-slip movements caused by Indo-Euroasia collision,and may have significant contributions from the mantle.