Zircon U-Pb Geochronology and Geochemistry of Mafic Dyke Swarms in Dengxiangying Group on West Margin of Yangtze Block, China
详细信息
- 责任者：Ren Guangming (Chengdu Institute of Geology and Mineral Resources ; China Geological Survey ; Chengdu 610081 ; China) ; Pang Weihua
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(1)
- 关键词：基性岩 ; basic rocks ; 岩墙群 ; dyke swarms ; 铀—铅计时 ; U-Pb dating ; 扬子地台 ; Yangtze Platform
- 页码：p.66-79
- 图表：illus., 2 tables, 68 refs.
- 分类号：0801
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
In the Dengxiangying Group,there are a large number of mafic dyke swarms,indicating an important tectonic-magmatic event during the Neoproterozoic period on the west margin of Yangtze Block in China. Combined with the regional geological data,the authors consider that the Neoproterozoic(～770 Ma B.P.) mafic dyke formed in the intra-plate extensional environment after Jinning orogeny on the west margin of Yangtze Block,sourced from the depleted asthenosphere mantle(DM),and contaminated by the crustal materials when the mantle upwell.This process is synchronous with the breakup of Rodinia supercontinent.
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