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Inflation and collapse of the Wai'anae volcano (Oahu, Hawaii, USA): implications from rock magnetic properties and magnetic fabric data of dikes

dc.contributor.authorHerrero-Bervera, Emilio
dc.contributor.authorHenry, Bernard
dc.contributor.authorMoreira, Mário
dc.date.accessioned2019-01-18T09:11:38Z
dc.date.available2019-01-18T09:11:38Z
dc.date.issued2018-12-06
dc.description.abstractIn order to investigate the role of dikes in the volcanic evolution and the triggering mechanisms of catastrophic mass wasting volcanoes, we have sampled for a pilot study, seven dikes within the Wai'anae volcano, Oahu, Hawaii. The width of the dikes ranged between 0.4 and 2.5m. This work focuses on the characterization of the magma flow directions using anisotropy of magnetic susceptibility (AMS) data in dikes of the inner part of the Wai'anae volcano. This part is now exposed, because this volcano experienced destabilization and flank collapse. Rock magnetism data show composite magnetic mineralogy, corresponding when plotted on the Day diagram to be dominated by single domain (SD) and pseudo-single domain particles of pure titanomagnetite, suggesting possible inverse magnetic fabric associated with the SD grains. The obtained magnetic fabric does not reflect such grain sizes and is probably partly related to the presence of different magnetic phases, resulting in part of our samples as having abnormal fabrics. We therefore used a simple criterion to eliminate most of the abnormal fabrics in order to analyze the magnetic fabric data in a clearer way. After rejection of most of the abnormal data, the determination of the magnetic zone axis, which underlines the effect of imbrication in dike margins, yielded reliable magma flow directions in most of the studied dikes, with a predominance of vertical to subvertical AMS directions. The inferred dominantly vertical to subvertical magma flow of dikes (feeding from below) within the most internal parts of the volcano, suggests a process of accumulation of new magma at different levels within the inner part of the edifice. This process was enhanced by subhorizontal magma flow toward the volcano center in two other dikes. Such accumulation helps to explain the inflation, subsequent destabilization, and flank collapse of the Wai'anae volcano.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationHERRERO-BERVERA, Emilio; HENRY, Bernard; MOREIRA, Mário – Inflation and collapse of the Wai'anae volcano (Oahu, Hawaii, USA): implications from rock magnetic properties and magnetic fabric data of dikes. Earth Planets and Space. ISSN 1880-5981. Vol. 70 (2018), pp. 1-19pt_PT
dc.identifier.doi10.1186/s40623-018-0960-zpt_PT
dc.identifier.issn1880-5981
dc.identifier.urihttp://hdl.handle.net/10400.21/9341
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerOpenpt_PT
dc.relationFCT/UID/GEO/50019 - Instituto Dom Luíspt_PT
dc.relation.publisherversionhttps://earth-planets-space.springeropen.com/track/pdf/10.1186/s40623-018-0960-zpt_PT
dc.subjectDikespt_PT
dc.subjectVolcanopt_PT
dc.subjectHawaiipt_PT
dc.subjectMagnetic fabricpt_PT
dc.subjectFlow directionpt_PT
dc.titleInflation and collapse of the Wai'anae volcano (Oahu, Hawaii, USA): implications from rock magnetic properties and magnetic fabric data of dikespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage19pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleEarth, Planets and Spacept_PT
oaire.citation.volume70pt_PT
person.familyNameMoreira
person.givenNameMário
person.identifier2793313
person.identifier.ciencia-idA214-9FF2-5978
person.identifier.orcid0000-0002-5933-3681
person.identifier.ridI-1214-2015
person.identifier.scopus-author-id26538801900
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication32d7ffa4-6692-421b-9d99-9571197bad17
relation.isAuthorOfPublication.latestForDiscovery32d7ffa4-6692-421b-9d99-9571197bad17

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