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Emeishan mantle plume and its potential impact on the Sichuan Basin: Insights from numerical modeling

文献类型：期刊论文

作者He, Lijuan1,2,3
刊名PHYSICS OF THE EARTH AND PLANETARY INTERIORS
出版日期2022-02-01
卷号323页码:8
关键词Emeishan mantle plume Sichuan Basin Geodynamic modeling Mantle convection Paleo-heat flow Basalts
ISSN号0031-9201
DOI10.1016/j.pepi.2022.106841
英文摘要The Sichuan Basin, adjacent to the Emeishan large igneous province (ELIP), is one of the large petroliferous basins in China. The effects of the ELIP on the basin thermal history and hydrocarbon generation have attracted much attentions. A 2D viscoplastic model is applied to simulate the evolution of the Emeishan mantle plume, and then the effects of the plume on the Sichuan Basin are discussed. Constrained by the pre-eruption uplift and volcanic activity, the modeling infers that the initial hemispherical Emeishan plume had a radius of 85-150 km and an excess temperature of 150-300 K. The plume head extended laterally after reaching the bottom of the lithosphere. The plume head-lithosphere interaction led to lithosphere erosion and partial melting atop the plume head. Near the junction between the inner and intermediate ELIP zones, the lithosphere erosion was the most serious and the mantle melting degree was the highest. There the basalt might erupt from the Xiaojing-Qiaojia fault, and flow to the intermediate ELIP zone due to terrain. That can explain the concentration of Emeishan basalts in the intermedia ELIP zone and the abnormal high paleo-heat flow in the southwestern Sichuan Basin. Thermal convection induced in the upper mantle prevented the plume head from spreading beneath the lithosphere, and the lateral extent of the plume head was 1200-1300 km. Only a few unmelted plume materials could reach the central Sichuan Basin, which should be the boundary of the outer ELIP zone. The Permian basalts and high paleo-heat flow anomalies in the central Sichuan basin might be derived from the subsequent lithospheric extension, which led to the upwelling and decompression melting of both the plume and asthenosphere materials. Since the plume head couldn't migrate to the northeastern Sichuan Basin, the surface observations there should be independent of the Emeishan plume.
WOS关键词LARGE IGNEOUS PROVINCE ; FLOOD-BASALT PROVINCE ; LITHOSPHERE INTERACTION ; CHINA ; CONSTRAINTS ; BENEATH ; PETROGENESIS ; GEODYNAMICS ; TOPOGRAPHY ; GENERATION
资助项目National Natural Science Foundation of China[41830424] ; National Natural Science Foundation of China[42074095]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000750859400003
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/104891]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者He, Lijuan
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 He, Lijuan. Emeishan mantle plume and its potential impact on the Sichuan Basin: Insights from numerical modeling[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2022,323:8.
APA He, Lijuan.(2022).Emeishan mantle plume and its potential impact on the Sichuan Basin: Insights from numerical modeling.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,323,8.
MLA He, Lijuan."Emeishan mantle plume and its potential impact on the Sichuan Basin: Insights from numerical modeling".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 323(2022):8.

入库方式： OAI收割

来源：地质与地球物理研究所

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