DOI: 10.1002/2015GL063704
论文题名: Crustal thickness and V<inf>p</inf>/V<inf>s</inf> ratio in NW Namibia from receiver functions: Evidence for magmatic underplating due to mantle plume-crust interaction
作者: Heit B. ; Yuan X. ; Weber M. ; Geissler W. ; Jokat W. ; Lushetile B. ; Hoffmann K.-H.
刊名: Geophysical Research Letters
ISSN: 0094-9601
EISSN: 1944-9332
出版年: 2015
卷: 42, 期: 9 起始页码: 3330
结束页码: 3337
语种: 英语
英文关键词: continental breakup
; crustal thickness
; magmatic underplating
; Vp /Vs ratios
; Walvis Ridge
Scopus关键词: Thermal plumes
; Continental break-up
; Crustal thickness
; Mantle plume
; Namibia
; Receiver functions
; Underplating
; Walvis Ridge
; Structural geology
; continental crust
; crustal thickness
; magmatism
; mantle plume
; underplating
; Atlantic Ocean
; Namibia
; Walvis Ridge
英文摘要: A seismological network was operated at the junction of the aseismic Walvis Ridge with the northwestern Namibian coast. We mapped crustal thickness and bulk Vp /Vs ratio by the H-k analysis of receiver functions. In the Damara Belt, the crustal thickness is ∼35km with a Vp /Vs ratio of <1.75. The crust is ∼30km thick at the coast in the Kaoko Belt. Strong variations in crustal thickness and Vp /Vs ratios are found at the landfall of the Walvis Ridge. Here and at ∼150km northeast of the coast, the crustal thickness increases dramatically reaching 44km and the Vp /Vs ratios are extremely high (∼1.89). These anomalies are interpreted as magmatic underplating produced by the mantle plume during the breakup of Gondwana. The area affected by the plume is smaller than 300km in diameter, possibly ruling out the existence of a large plume head under the continent during the breakup. Key Points Thick crust, high Vp /Vs ratios is found at the landfall of the Walvis Ridge Evidence for magmatic underplating beneath the African continental crust The extension of the plume area of influence is less than 300km in diameter ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930484740&doi=10.1002%2f2015GL063704&partnerID=40&md5=af51807f10a35b012c0f1bc0a9648633
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9216
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Deutsches GeoForschungsZentrum GFZ, Potsdam, Germany
Recommended Citation:
Heit B.,Yuan X.,Weber M.,et al. Crustal thickness and V<inf>p</inf>/V<inf>s</inf> ratio in NW Namibia from receiver functions: Evidence for magmatic underplating due to mantle plume-crust interaction[J]. Geophysical Research Letters,2015-01-01,42(9).