Crustal thickness and V p / V s ratio in NW Namibia from receiver functions: Evidence for magmatic underplating due to mantle plume‐crust interaction
A seismological network was operated at the junction of the aseismic Walvis Ridge with the northwestern Namibian coast. We mapped crustal thickness and bulk V p / V s ratio by the H‐k analysis of receiver functions. In the Damara Belt, the crustal thickness is ~35 km with a V p / V s ratio of
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| Veröffentlicht in: | Geophysical research letters 2015-05, Vol.42 (9), p.3330-3337 |
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| container_title | Geophysical research letters |
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| creator | Heit, Benjamin Yuan, Xiaohui Weber, Michael Geissler, Wolfram Jokat, Wilfried Lushetile, Bufelo Hoffmann, Karl‐Heinz |
| description | A seismological network was operated at the junction of the aseismic Walvis Ridge with the northwestern Namibian coast. We mapped crustal thickness and bulk
V
p
/
V
s
ratio by the H‐k analysis of receiver functions. In the Damara Belt, the crustal thickness is ~35 km with a
V
p
/
V
s
ratio of |
| doi_str_mv | 10.1002/2015GL063704 |
| format | Article |
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V
p
/
V
s
ratio by the H‐k analysis of receiver functions. In the Damara Belt, the crustal thickness is ~35 km with a
V
p
/
V
s
ratio of <1.75. The crust is ~30 km thick at the coast in the Kaoko Belt. Strong variations in crustal thickness and
V
p
/
V
s
ratios are found at the landfall of the Walvis Ridge. Here and at ~150 km northeast of the coast, the crustal thickness increases dramatically reaching 44 km and the
V
p
/
V
s
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 300 km in diameter, possibly ruling out the existence of a large plume head under the continent during the breakup.
Thick crust, high
V
p
/
V
s
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 300 km in diameter</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2015GL063704</identifier><language>eng</language><ispartof>Geophysical research letters, 2015-05, Vol.42 (9), p.3330-3337</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c235t-4f695220e95c79eaea6ee370027bb3ef137451ede10e8bb662ded5b00f4f09b03</citedby><cites>FETCH-LOGICAL-c235t-4f695220e95c79eaea6ee370027bb3ef137451ede10e8bb662ded5b00f4f09b03</cites><orcidid>0000-0002-2891-1354</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Heit, Benjamin</creatorcontrib><creatorcontrib>Yuan, Xiaohui</creatorcontrib><creatorcontrib>Weber, Michael</creatorcontrib><creatorcontrib>Geissler, Wolfram</creatorcontrib><creatorcontrib>Jokat, Wilfried</creatorcontrib><creatorcontrib>Lushetile, Bufelo</creatorcontrib><creatorcontrib>Hoffmann, Karl‐Heinz</creatorcontrib><title>Crustal thickness and V p / V s ratio in NW Namibia from receiver functions: Evidence for magmatic underplating due to mantle plume‐crust interaction</title><title>Geophysical research letters</title><description>A seismological network was operated at the junction of the aseismic Walvis Ridge with the northwestern Namibian coast. We mapped crustal thickness and bulk
V
p
/
V
s
ratio by the H‐k analysis of receiver functions. In the Damara Belt, the crustal thickness is ~35 km with a
V
p
/
V
s
ratio of <1.75. The crust is ~30 km thick at the coast in the Kaoko Belt. Strong variations in crustal thickness and
V
p
/
V
s
ratios are found at the landfall of the Walvis Ridge. Here and at ~150 km northeast of the coast, the crustal thickness increases dramatically reaching 44 km and the
V
p
/
V
s
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 300 km in diameter, possibly ruling out the existence of a large plume head under the continent during the breakup.
Thick crust, high
V
p
/
V
s
ratios is found at the landfall of the Walvis Ridge
Evidence for magmatic underplating beneath the African continental crust
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V
p
/
V
s
ratio by the H‐k analysis of receiver functions. In the Damara Belt, the crustal thickness is ~35 km with a
V
p
/
V
s
ratio of <1.75. The crust is ~30 km thick at the coast in the Kaoko Belt. Strong variations in crustal thickness and
V
p
/
V
s
ratios are found at the landfall of the Walvis Ridge. Here and at ~150 km northeast of the coast, the crustal thickness increases dramatically reaching 44 km and the
V
p
/
V
s
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 300 km in diameter, possibly ruling out the existence of a large plume head under the continent during the breakup.
Thick crust, high
V
p
/
V
s
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 300 km in diameter</abstract><doi>10.1002/2015GL063704</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-2891-1354</orcidid><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0094-8276 |
| ispartof | Geophysical research letters, 2015-05, Vol.42 (9), p.3330-3337 |
| issn | 0094-8276 1944-8007 |
| language | eng |
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| source | Wiley Online Library - AutoHoldings Journals; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection) |
| title | Crustal thickness and V p / V s ratio in NW Namibia from receiver functions: Evidence for magmatic underplating due to mantle plume‐crust interaction |
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