气候变化领域集成服务门户(CCPortal): Crustal structure beneath the Ethiopian Plateau and adjacent areas from receiver functions: Implications for partial melting and magmatic underplating

CCPortal

DOI	10.1016/j.tecto.2021.228857
	Crustal structure beneath the Ethiopian Plateau and adjacent areas from receiver functions: Implications for partial melting and magmatic underplating
	Wang T.; Gao S.S.; Yang Q.; Liu K.H.
发表日期	2021
ISSN	00401951
卷号	809
英文摘要	Receiver function measurements of crustal thickness (H) and Vp/Vs provide important information on the formation and evolution of continental plateaus and rift zones such as the Ethiopian Plateau, the Afar and Main Ethiopian Rifts in northeastern Africa. Unfortunately, the presence of a low-velocity sedimentary layer atop most of the Cenozoic rift basins may lead to strong reverberations that can mask the P-to-S conversions from the Moho, resulting in unreliable H and Vp/Vs measurements. Here we estimate H and Vp/Vs beneath the Afar Depression (AD), Ethiopian Plateau (EP), and the Main Ethiopian Rift (MER) by stacking receiver functions. Reliable H and Vp/Vs measurements are obtained at a total of 69 stations, among which 18 stations are pre-processed by applying the reverberation removal technique. In comparison to the MER and EP, the AD is characterized by a thinner crust and higher Vp/Vs, and the thinnest crust and highest Vp/Vs are found in the Red Sea Rift (RSR) in central AD. Gradual variations of H and Vp/Vs between the previous and present axes of the RSR support a gradual rather than jumpy migration model of the axis. The overall high Vp/Vs values in the study area can be interpreted as a combined result of continental flood basalts at the surface, magmatic intrusion, and crustal partial melting. The relatively low amplitude of the P-to-S converted phases from the Moho observed in the southern part of the western Ethiopian Plateau and the AD with the exception of the RSR may be attributed to magmatic underplating. © 2021 Elsevier B.V.
关键词	Crustal structure Ethiopian Plateau Receiver function
英文关键词	Basalt; Melting; Reverberation; Continental flood basalt; Crustal structure; Crustal thickness; Formation and evolutions; Magmatic intrusions; Main Ethiopian Rift; Receiver functions; Sedimentary layers; Structural geology; crustal structure; crustal thickness; magmatic differentiation; Moho; partial melting; plate tectonics; rifting; underplating; Ethiopian Highlands
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208087
作者单位	Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, United States
推荐引用方式 GB/T 7714	Wang T.,Gao S.S.,Yang Q.,et al. Crustal structure beneath the Ethiopian Plateau and adjacent areas from receiver functions: Implications for partial melting and magmatic underplating[J],2021,809.
APA	Wang T.,Gao S.S.,Yang Q.,&Liu K.H..(2021).Crustal structure beneath the Ethiopian Plateau and adjacent areas from receiver functions: Implications for partial melting and magmatic underplating.Tectonophysics,809.
MLA	Wang T.,et al."Crustal structure beneath the Ethiopian Plateau and adjacent areas from receiver functions: Implications for partial melting and magmatic underplating".Tectonophysics 809(2021).