Neoproterozoic Magmatism in South Yunnan: Evidence from SHRIMP Zircon U-Pb Geochrological Results of High-Grade Metamorphic Rocks in the Yaoshan Group
详细信息
- 责任者：Li Baolong (Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Ji Jianqing
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(10)
- 关键词：变质岩 ; metamorphic rocks ; 铀—铅计时 ; U-Pb dating ; 云南 ; Yunnan Province
- 页码：p.1584-1591
- 图表：4 illus., 1 table, 45 refs.
- 分类号：0802,1300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
In this paper, the SHRIMP zircon U-Pb dating has been conducted on the augen granitic mylonite (08HK-1) from the Yaoshan Group (Lianhuatan, Hekou County) and gneissic granite (08JP-5, Adebo, Jinping County), and ages of two magmatic zircon groups are (828±6.2) Ma (N=11, MSWD=1.8) and (748~801) Ma, respectively. Based on geochronological data and regional geological tectonic evolution, the Yaoshan area and southern part of Ailao Shan should located in the cross region of the Nanhua Rift and the Kangdian Rift during breaking-up of the Rodinian Super-continent in the Neoproterozoic.