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Convective patterns under the Indo-Atlantic << box >>

2005-11-15Journal article Restricted access
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dc.contributor.authorDavaille, A.
dc.contributor.authorStutzmann, E.
dc.contributor.authorSilveira, Graça
dc.contributor.authorBesse, J.
dc.contributor.authorCourtillot, V
dc.date.accessioned2014-05-30T15:45:51Z
dc.date.available2014-05-30T15:45:51Z
dc.date.issued2005-11-15
dc.description.abstractUsing fluid mechanics, we reinterpret the mantle images obtained from global and regional tomography together with geochemical, geological and paleomagnetic observations, and attempt to unravel the pattern of convection in the Indo-Atlantic "box" and its temporal evolution over the last 260 Myr. The << box >> presently contains a) a broad slow seismic anomaly at the CMB which has a shape similar to Pangea 250 Myr ago, and which divides into several branches higher in the lower mantle, b) a "superswell, centered on the western edge of South Africa, c) at least 6 "primary hotspots" with long tracks related to traps, and d) numerous smaller hotspots. In the last 260 Myr, this mantle box has undergone 10 trap events, 7 of them related to continental breakup. Several of these past events are spatially correlated with present-day seismic anomalies and/or upwellings. Laboratory experiments show that superswells, long-lived hotspot tracks and traps may represent three evolutionary stages of the same phenomenon, i.e. episodic destabilization of a hot, chemically heterogeneous thermal boundary layer, close to the bottom of the mantle. When scaled to the Earth's mantle, its recurrence time is on the order of 100-200 Myr. At any given time, the Indo-Atlantic box should contain 3 to 9 of these instabilities at different stages of their development, in agreement with observations. The return flow of the downwelling slabs, although confined to two main << boxes >> (Indo-Atlantic and Pacific) by subduction zone geometry, may therefore not be passive, but rather take the form of active thermochemical instabilities. (c) 2005 Elsevier B.V. All rights reserved.por
dc.identifier.citationDAVAILLE, A.; STUTZMANN, E.; SILVEIRA, G.; BESSE, J.; COURTILLOT, V. - Convective patterns under the Indo-Atlantic << box >>. Earth and Planetary Science Letters. ISSN 0012-821X. Vol. 239, nr. 3-4 (2005), p. 233-252.por
dc.identifier.issn0012-821X
dc.identifier.other10.1016/j.epsl.2005.07.024
dc.identifier.urihttp://hdl.handle.net/10400.21/3593
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science BVpor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0012821X05005200por
dc.subjectConvectionpor
dc.subjectMantle plumespor
dc.subjectHotspotspor
dc.subjectTrapspor
dc.subjectTomographypor
dc.subjectCore-Mantle Boundarypor
dc.subject2-Layer Thermal-Miscible Viscous Fluidspor
dc.subjectPlate Driving Forcespor
dc.subjectTrue Polar Wanderpor
dc.subjectFlood Basaltspor
dc.subjectDeep Mantlepor
dc.subjectAfrican Superswellpor
dc.subjectDynamic Topographypor
dc.subjectSeismic Tomographypor
dc.titleConvective patterns under the Indo-Atlantic << box >>por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage252por
oaire.citation.issue3-4por
oaire.citation.startPage233por
oaire.citation.titleEarth and Planetary Science Letterspor
oaire.citation.volume239por
person.familyNameSilveira
person.givenNameGraça
person.identifier91922
person.identifier.ciencia-id1116-1080-16F3
person.identifier.orcid0000-0002-2110-2554
person.identifier.ridA-3081-2009
person.identifier.scopus-author-id6602698071
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationd4ff725a-b30b-4acb-906d-b60530a4994f
relation.isAuthorOfPublication.latestForDiscoveryd4ff725a-b30b-4acb-906d-b60530a4994f

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