Repository logo
 
Publication

Cape Verde hotspot from the upper crust to the top of the lower mantle

2012-02-15Journal article Open access
Simple item page
dc.contributor.authorVinnik, Lev
dc.contributor.authorSilveira, Graça
dc.contributor.authorKiselev, Sergei
dc.contributor.authorFarra, Veronique
dc.contributor.authorWeber, Michael
dc.contributor.authorStutzmann, Eleonore
dc.date.accessioned2012-10-31T12:01:17Z
dc.date.available2012-10-31T12:01:17Z
dc.date.issued2012-02-15
dc.description.abstractWe investigate the crust, upper mantle and mantle transition zone of the Cape Verde hotspot by using seismic P and S receiver functions from several tens of local seismograph stations. We find a strong discontinuity at a depth of similar to 10 km underlain by a similar to 15-km thick layer with a high (similar to 1.9) Vp/Vs velocity ratio. We interpret this discontinuity and the underlying layer as the fossil Moho, inherited from the pre-hotspot era, and the plume-related magmatic underplate. Our uppermost-mantle models are very different from those previously obtained for this region: our S velocity is much lower and there are no indications of low densities. Contrary to previously published arguments for the standard transition zone thickness our data indicate that this thickness under the Cape Verde islands is up to similar to 30 km less than in the ambient mantle. This reduction is a combined effect of a depression of the 410-km discontinuity and an uplift of the 660-km discontinuity. The uplift is in contrast to laboratory data and some seismic data on a negligible dependence of depth of the 660-km discontinuity on temperature in hotspots. A large negative pressure-temperature slope which is suggested by our data implies that the 660-km discontinuity may resist passage of the plume. Our data reveal beneath the islands a reduction of S velocity of a few percent between 470-km and 510-km depths. The low velocity layer in the upper transition zone under the Cape Verde archipelago is very similar to that previously found under the Azores and a few other hotspots. In the literature there are reports on a regional 520-km discontinuity, the impedance of which is too large to be explained by the known phase transitions. Our observations suggest that the 520-km discontinuity may present the base of the low-velocity layer in the transition zone. (C) 2011 Elsevier B.V. All rights reserved.por
dc.identifier.citationVinnik L, Silveira G, Kiselev S, Farra V, Weber M, Stutzman E. Cape Verde hotspot from the upper crust to the top of the lower mantle. Earth and Planetary Science Letters. 2012; (319): 259-268.por
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/10400.21/1863
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science BVpor
dc.subjectHotspotpor
dc.subjectPlumepor
dc.subjectCrustpor
dc.subjectUpper mantlepor
dc.subjectMantle transition zonepor
dc.subjectReceiver functionpor
dc.subjectS receiver functionspor
dc.subjectTransition zonepor
dc.subjectEarths mantlepor
dc.subjectWavespor
dc.subjectPlumepor
dc.subjectDiscontinuitypor
dc.subjectBeneathpor
dc.subjectDepthpor
dc.subjectStratificationpor
dc.subjectTomographypor
dc.titleCape Verde hotspot from the upper crust to the top of the lower mantlepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage268por
oaire.citation.startPage259por
oaire.citation.titleEarth and Planetary Science Letterspor
oaire.citation.volume319por
person.familyNameVinnik
person.familyNameSilveira
person.familyNameStutzmann
person.givenNameLev
person.givenNameGraça
person.givenNameEleonore
person.identifier91922
person.identifier.ciencia-id1116-1080-16F3
person.identifier.orcid0000-0002-1135-6200
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0002-4348-7475
person.identifier.ridA-3081-2009
person.identifier.ridG-8511-2014
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id6603444257
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication274ab7b0-7205-4772-a163-e9d446f95ff5
relation.isAuthorOfPublicationd4ff725a-b30b-4acb-906d-b60530a4994f
relation.isAuthorOfPublication7c72ce1b-5e3b-4bf3-960c-bb50bad793bc
relation.isAuthorOfPublication.latestForDiscovery274ab7b0-7205-4772-a163-e9d446f95ff5

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Cape Verde hotspot from the upper crust to the top of the lower mantle.rep.pdf
Size:
201.88 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ISEL - Física - Artigos