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Mantle origin of the Emeishan large igneous province (South China) from the analysis of residual gravity anomalies

文献类型：期刊论文

作者Deng, Yangfan1,2; Zhang, Zhongjie2; Mooney, Walter3; Badal, Jose4; Fan, Weiming1; Zhong, Qiu5
刊名LITHOS
出版日期2014-09-01
卷号204页码:4-13
关键词Stripping Residual gravity anomaly Density anomaly model Mantle plume Emeishan igneous province South China
ISSN号0024-4937
DOI10.1016/j.lithos.2014.02.008
文献子类Article
英文摘要Despite numerous geologic and geochemical studies conducted on the Emeishan Large Igneous Province (LIP) in SW China, the deep origin of this LIP is still poorly constrained. Here we investigate the residual gravity anomaly in South China, and its relationship to the Emeishan LIP, in conjunction with deep seismic sounding profiles, deep seismic reflection surveys and a variety of broadband seismic observations performed in South China during the past few decades. Our analysis includes the removal of related gravitational effects due to: (1) the sediments, (2) the crystalline basement, undulations of (3) the upper crust, (4) the Moho and (5) the mantle lid. The resultant residual gravity anomaly in the Emeishan LIP and surrounding region reaches a maximum value of + 150 mGal and decreases gradually with distance from this inner zone. With the conjugate gradient method, we develop a lithospheric model consisting of a cylindrical-shaped positive density anomaly that provides a good fit to the observed residual gravity anomaly. The inverted density anomaly of the Emeishan LIP is +0.06 g/cm(3) in the inner zone and decreases to about +0.03 g/cm(3) in the outer zone. The observed positive residual gravity and the corresponding high density can be attributed to mafic/ultramafic rocks and cooled surrounding rocks generated by large scale magmatic intrusion. Hence, taking account of the Permian Emeishan LIP, our residual gravity and density model provide evidence for the formation by an upwelling of a mantle plume. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词PERMIAN-TRIASSIC BOUNDARY ; FLOOD-BASALT PROVINCE ; CRUSTAL STRUCTURE ; SOUTHWESTERN CHINA ; VELOCITY STRUCTURE ; CONTINENTAL-CRUST ; SEISMIC TOMOGRAPHY ; THERMAL STRUCTURE ; MASS EXTINCTION ; OROGENIC BELT
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000342260400002
出版者ELSEVIER SCIENCE BV
资助机构National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Nature Science Foundation of China(41021063) ; National Nature Science Foundation of China(41021063) ; Earthquake Hazard Program of the US Geological Survey ; Earthquake Hazard Program of the US Geological Survey ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Nature Science Foundation of China(41021063) ; National Nature Science Foundation of China(41021063) ; Earthquake Hazard Program of the US Geological Survey ; Earthquake Hazard Program of the US Geological Survey ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Nature Science Foundation of China(41021063) ; National Nature Science Foundation of China(41021063) ; Earthquake Hazard Program of the US Geological Survey ; Earthquake Hazard Program of the US Geological Survey ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Nature Science Foundation of China(41021063) ; National Nature Science Foundation of China(41021063) ; Earthquake Hazard Program of the US Geological Survey ; Earthquake Hazard Program of the US Geological Survey
源URL[http://ir.iggcas.ac.cn/handle/132A11/86020]  
专题中国科学院地质与地球物理研究所
通讯作者Deng, Yangfan
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.US Geol Survey, Menlo Pk, CA 94025 USA
4.Univ Zaragoza, Zaragoza 50009, Spain
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Deng, Yangfan,Zhang, Zhongjie,Mooney, Walter,et al. Mantle origin of the Emeishan large igneous province (South China) from the analysis of residual gravity anomalies[J]. LITHOS,2014,204:4-13.
APA Deng, Yangfan,Zhang, Zhongjie,Mooney, Walter,Badal, Jose,Fan, Weiming,&Zhong, Qiu.(2014).Mantle origin of the Emeishan large igneous province (South China) from the analysis of residual gravity anomalies.LITHOS,204,4-13.
MLA Deng, Yangfan,et al."Mantle origin of the Emeishan large igneous province (South China) from the analysis of residual gravity anomalies".LITHOS 204(2014):4-13.

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