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Constrains on the structure of Maio Island (Cape Verde) by a three-dimensional gravity model: Imaging partially exhumed magma chambers

2012-08Journal article Restricted access
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dc.contributor.authorRepresas, Patrícia
dc.contributor.authorCatalão, João
dc.contributor.authorMontesinhos, Fuensanta G.
dc.contributor.authorMadeira, JFA
dc.contributor.authorMata, João
dc.contributor.authorAntunes, Carlos
dc.contributor.authorMoreira, Mário
dc.date.accessioned2015-09-10T10:59:56Z
dc.date.available2015-09-10T10:59:56Z
dc.date.issued2012-08
dc.description.abstractWe propose a 3-D gravity model for the volcanic structure of the island of Maio (Cape Verde archipelago) with the objective of solving some open questions concerning the geometry and depth of the intrusive Central Igneous Complex. A gravity survey was made covering almost the entire surface of the island. The gravity data was inverted through a non-linear 3-D approach which provided a model constructed in a random growth process. The residual Bouguer gravity field shows a single positive anomaly presenting an elliptic shape with a NWSE trending long axis. This Bouguer gravity anomaly is slightly off-centred with the island but its outline is concordant with the surface exposure of the Central Igneous Complex. The gravimetric modelling shows a high-density volume whose centre of mass is about 4500 m deep. With increasing depth, and despite the restricted gravimetric resolution, the horizontal sections of the model suggest the presence of two distinct bodies, whose relative position accounts for the elongated shape of the high positive Bouguer gravity anomaly. These bodies are interpreted as magma chambers whose coeval volcanic counterparts are no longer preserved. The orientation defined by the two bodies is similar to that of other structures known in the southern group of the Cape Verde islands, thus suggesting a possible structural control constraining the location of the plutonic intrusions.por
dc.identifier.citationREPRESAS, P.; [et al] – Constrains on the structure of Maio Island (Cape Verde) by a three-dimensional gravity model: Imaging partially exhumed magma chambers. Geophysical Journal International. ISSN: 0956-540X. Vol. 190, nr. 2 (2012), pp. 931-940por
dc.identifier.doi10.1111/j.1365-246X.2012.05536.x
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/10400.21/5145
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherWiley-Blackwellpor
dc.relationPTDC/CTEGIN/64330/2006
dc.relationStrategic Project - LA 19 - 2011-2012
dc.relationStrategic Project - UI 263 - 2011-2012
dc.subjectInverse Theorypor
dc.subjectGravity Anomalies and Earth Structurepor
dc.subjectOceanic Hotspots and Intraplate Volcanismpor
dc.subjectCrustal Structurepor
dc.subjectAfricapor
dc.subjectAtlantic Oceanpor
dc.subjectLithospheric Flexure
dc.subjectIsotropic Signatures
dc.subjectSatellite Altimetry
dc.subjectCanary-Islands
dc.subjectMantle Plumes
dc.subjectSal Island
dc.subjectNoble-Gas
dc.subjectArchipelago
dc.subjectAnomalies
dc.subjectEvolution
dc.titleConstrains on the structure of Maio Island (Cape Verde) by a three-dimensional gravity model: Imaging partially exhumed magma chamberspor
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleStrategic Project - LA 19 - 2011-2012
oaire.awardTitleStrategic Project - UI 263 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FCTE%2FLA0019%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FCTE%2FUI0263%2F2011/PT
oaire.citation.conferencePlaceHoboken
oaire.citation.endPage940por
oaire.citation.issue2por
oaire.citation.startPage931por
oaire.citation.titleGeophysical Journal Internationalpor
oaire.citation.volume190por
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMadeira
person.familyNameMoreira
person.givenNameJose Firmino Aguilar
person.givenNameMário
person.identifier2793313
person.identifier.ciencia-id6F1E-DCF0-D6EC
person.identifier.ciencia-idA214-9FF2-5978
person.identifier.orcid0000-0001-9523-3808
person.identifier.orcid0000-0002-5933-3681
person.identifier.ridN-6918-2016
person.identifier.ridI-1214-2015
person.identifier.scopus-author-id7003405549
person.identifier.scopus-author-id26538801900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication32d7ffa4-6692-421b-9d99-9571197bad17
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