Magmatic underplating beneath the Emeishan large igneous province (South China) revealed by the COMGRA-ELIP experiment

doi:10.1016/j.tecto.2016.01.039

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Magmatic underplating beneath the Emeishan large igneous province (South China) revealed by the COMGRA-ELIP experiment
	Deng, Yangfan 1; Chen, Yun 2; Wang, Peng 3; Essa, Khalid S.4; Xu, Tao 2; Liang, Xiaofeng 2; Badal, Jose 5
刊名	TECTONOPHYSICS
	2016-03-16
卷号	672 页码:16-23
关键词	Stripping Residual gravity Density anomaly Underplating Emeishan large igneous province South China
DOI	10.1016/j.tecto.2016.01.039
文献子类	Article
英文摘要	Because of the abundant geological, geochemical and geophysical studies conducted on the Emeishan large igneous province (ELIP) in South China, the Permian mantle plume model associated with this region is widely accepted. Furthermore, the dome-shaped structure related with this plume has been determined with success by sedimentological data and gravity stripping. Although the sediment thickness, upper crust, Moho depth and the lithosphere-asthenosphere boundary (LAB) are well constrained by active- and passive-source seismological results, the density anomaly in ELIP is still a poorly constrained issue that needs further attention. With the aim especially to understand the impact on surface of the magmatic processes that originated in the deep mantle, we performed the COMGRA-ELIP gravity experiment across this region. Using a stripping method, we determined the residual gravity in ELIP and surrounding areas. The residual gravity reaches a maximum value of +150 mGal in the inner zone of ELIP and its strength decreases gradually when measuring from the inner zone to the middle and outer zones. Combining active and passive seismic results and the least-squares variance analysis method, we propose a strong density contrast of 0.2 g/cm(3) (density of 3.14 g/cm(3)) for the 15- to 20-km-thick igneous layer accreted at the base of the crust, as evidence of crustal underplating in ELIP, to explain the present-day residual gravity anomaly. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	MANTLE PLUME ACTIVITY ; SOUTHWESTERN CHINA ; GRAVITY-DATA ; CONTINENTAL-CRUST ; SEISMIC VELOCITY ; DENSITY STRUCTURE ; FLOOD BASALTS ; SW CHINA ; LITHOSPHERE ; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000374608400002
资助机构	National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; State Key Laboratory of Isotope Geochemistry(SKLIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-RC-14-03) ; National Basic Research Program of China (973 Program)(2011CB808904) ; National Basic Research Program of China (973 Program)(2011CB808904) ; State Key Laboratory of Isotope Geochemistry(SKLIG-RC-14-03) ; State Key Laboratory of Isotope Geochemistry(SKLIG-RC-14-03)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53470]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.China Earthquake Adm, Inst Earthquake Sci, Beijing 100036, Peoples R China 4.Cairo Univ, Fac Sci, Dept Geophys, Giza, Egypt 5.Univ Zaragoza, Phys Earth, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
推荐引用方式 GB/T 7714	Deng, Yangfan,Chen, Yun,Wang, Peng,et al. Magmatic underplating beneath the Emeishan large igneous province (South China) revealed by the COMGRA-ELIP experiment[J]. TECTONOPHYSICS,2016,672:16-23.
APA	Deng, Yangfan.,Chen, Yun.,Wang, Peng.,Essa, Khalid S..,Xu, Tao.,...&Badal, Jose.(2016).Magmatic underplating beneath the Emeishan large igneous province (South China) revealed by the COMGRA-ELIP experiment.TECTONOPHYSICS,672,16-23.
MLA	Deng, Yangfan,et al."Magmatic underplating beneath the Emeishan large igneous province (South China) revealed by the COMGRA-ELIP experiment".TECTONOPHYSICS 672(2016):16-23.