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Volcano-tectonic evolution of a linear volcanic ridge (Pico-Faial Ridge, Azores Triple Junction) assessed by paleomagnetic studies

2018-02-15Journal article Restricted access
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dc.contributor.authorSilva, Pedro
dc.contributor.authorHenry, Bernard
dc.contributor.authorMarques, Fernando Ornelas
dc.contributor.authorHildenbrand, Anthony
dc.contributor.authorLopes, Ana
dc.contributor.authorMadureira, Pedro Miguel
dc.contributor.authorMadeira, JFA
dc.contributor.authorNunes, João C.
dc.contributor.authorRoxerová, Zuzana
dc.date.accessioned2018-02-20T15:19:05Z
dc.date.available2018-02-20T15:19:05Z
dc.date.issued2018-02-15
dc.description.abstractThe morphology of volcanic oceanic islands results from the interplay between constructive and destructive processes, and tectonics. In this study, the analysis of the paleomagnetic directions obtained on well-dated volcanic rocks is used as a tool to assess tilting related to tectonics and large-scale volcano instability along the Pico-Faial linear volcanic ridge (Azores Triple Junction, Central-North Atlantic). For this purpose, 530 specimens from 46 lava flows and one dyke from Pico and Faial islands were submitted to thermal and alternating magnetic fields demagnetizations. Detailed rock magnetic analyses, including thermomagnetic analyses and classical high magnetic field experiments revealed titanomagnetites with different Ti-content as the primary magnetic carrier, capable of recording stable remanent magnetizations. In both islands, the paleomagnetic analysis yields a Characteristic Remanent Magnetization, which presents island mean direction with normal and reversed polarities in agreement with the islands location and the age of the studied lava flows, indicating a primary thermo-remanent magnetization. Field observations and paleomagnetic data show that lava flows were emplaced on pre-existing slopes and were later affected by significant tilting. In Faial Island, magmatic inflation and normal faults making up an island-scale graben, can be responsible for the tilting. In Pico Island, inflation related to magma intrusion during flow emplacement can be at the origin of the inferred tilting, whereas gradual downward movement of the SE flank by slumping processes appears mostly translational.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSILVA, Pedro F.; [et al] – Volcano-tectonic evolution of a linear volcanic ridge (Pico-Faial Ridge, Azores Triple Junction) assessed by paleomagnetic studies. Journal of Volcanology and Geothermal Research. ISSN 0377-0273. Vol. 352 (2018), pp. 78-91pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.jvolgeores.2018.01.005pt_PT
dc.identifier.issn0377-0273
dc.identifier.urihttp://hdl.handle.net/10400.21/8076
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationProject TEAMINT - POCTI/CTE/48137/2002pt_PT
dc.relationEVOLV - Evolution of Linear Volcanic ridges in Central Azores: interaction between magmatic and tectonic processes.
dc.relationHolocene and Pleistocene recovery of geomagnetic secular variation in the North Atlantic (Azores and Cape-Verde archipelagos and Portugal mainland): Geomagnetic and volcanological implications
dc.relation.publisherversionhttps://ac.els-cdn.com/S0377027317300355/1-s2.0-S0377027317300355-main.pdf?_tid=4178048e-164f-11e8-b88d-00000aab0f6c&acdnat=1519139209_f5b081228d516a4db0035b5f710eb476pt_PT
dc.subjectPaleomagnetismpt_PT
dc.subjectTiltingpt_PT
dc.subjectAzorespt_PT
dc.subjectVolcanismpt_PT
dc.subjectTectonicspt_PT
dc.subjectMagma chamberspt_PT
dc.titleVolcano-tectonic evolution of a linear volcanic ridge (Pico-Faial Ridge, Azores Triple Junction) assessed by paleomagnetic studiespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEVOLV - Evolution of Linear Volcanic ridges in Central Azores: interaction between magmatic and tectonic processes.
oaire.awardTitleHolocene and Pleistocene recovery of geomagnetic secular variation in the North Atlantic (Azores and Cape-Verde archipelagos and Portugal mainland): Geomagnetic and volcanological implications
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FCTE-GIN%2F71838%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTE-GIX%2F108149%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FGEO-FIQ%2F3648%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FGEO%2F50019%2F2013/PT
oaire.citation.endPage91pt_PT
oaire.citation.startPage78pt_PT
oaire.citation.titleJournal of Volcanology and Geothermal Researchpt_PT
oaire.citation.volume352pt_PT
oaire.fundingStream5876-PPCDTI
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
oaire.fundingStream5876
person.familyNameSilva
person.familyNameMarques
person.familyNameHildenbrand
person.familyNameMadureira
person.familyNameMadeira
person.familyNameRoxerová
person.givenNamePedro
person.givenNameFernando Ornelas
person.givenNameAnthony
person.givenNamePedro Miguel
person.givenNameJose Firmino Aguilar
person.givenNameZuzana
person.identifier1232178
person.identifier.ciencia-idC314-1157-FD0C
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person.identifier.ciencia-idBD11-66D7-5BC3
person.identifier.ciencia-id6F1E-DCF0-D6EC
person.identifier.orcid0000-0002-9178-3623
person.identifier.orcid0000-0002-9163-6084
person.identifier.orcid0000-0002-1406-7252
person.identifier.orcid0000-0003-4762-6273
person.identifier.orcid0000-0001-9523-3808
person.identifier.orcid0000-0002-4379-3026
person.identifier.ridB-8512-2008
person.identifier.ridB-7120-2008
person.identifier.ridF-4892-2010
person.identifier.ridN-6918-2016
person.identifier.scopus-author-id55431034700
person.identifier.scopus-author-id7102759947
person.identifier.scopus-author-id24503642500
person.identifier.scopus-author-id7003405549
person.identifier.scopus-author-id13407365600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
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
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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