Geometry of the Mafic Dyke Swarms in Emeishan Large Igneous Province: Implications for Mantle Plume
详细信息
- 责任者：Li Hongbo (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Zhaochong
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(10)
- 关键词：岩墙群 ; dyke swarms ; 地幔柱 ; plumes ; 四川 ; Sichuan Province ; 贵州 ; Guizhou Province ; 云南 ; Yunnan Province
- 页码：p.3143-3152
- 图表：5 illus., 1 table, 80 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Based on regional geological information at scale of 1 ∶ 200 000 and 1∶ 50 000 and field observation, the authors study the geometry of mafic （diabase） dyke swarms in Emeishan large igneous province （ELIP）. The pattern of the dyke swarms is radiating from a centre, which is composed of six giant dyke swarms with radiate angle 200°. The centre is located at the Yongren area, Yunnan Province, which likely locates the centre of mantle plume head which was responsible for the Permian Emeishan flood basalt event. The results from the dyke swarms are consistent with the location of the maximum crust uplift inferred by previous study from stratigraphic study. There are more dyke swarms in the middle and east than west, which can plausibly be interpreted by different erosion during post-LIP event.
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