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dc.contributor.authorCalvo Rathert, Manuel 
dc.contributor.authorVernet Tarrago, Eva 
dc.contributor.authorParés Casanova, Josep M.
dc.contributor.authorSoler, Vicente
dc.contributor.authorSánchez Moreno, Elisa María 
dc.contributor.authorBógalo Román, Mª Felicidad 
dc.contributor.authorCarrancho Alonso, Ángel 
dc.contributor.authorYamamoto, Yuhji
dc.contributor.authorRodríguez Méndez, Lidia
dc.date.accessioned2025-02-05T07:48:19Z
dc.date.available2025-02-05T07:48:19Z
dc.date.issued2024
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/10259/10167
dc.description.abstractA basaltic lava flow erupted from the Tajogaite volcano on 4 December 2021, in La Palma (Canary Islands, Spain) was sampled to find out to what extent reliable and correct information on both intensity and direction of the Earth's magnetic field can be obtained from the palaeomagnetic signal recorded in a lava flow which erupted under known conditions. Samples were taken every few centimetres across a flow up to a total of 27 oriented cores. Palaeomagnetic experiments showed a strong viscous overprint in many samples. Nevertheless, the mean palaeomagnetic direction obtained agrees well with the actual value from IGRF-13. Rock magnetic experiments were performed to obtain additional information about the quality and reliability of the results and the reasons for unsuccessful determinations. Analysis of mostly irreversible thermomagnetic curves showed that the carriers of remanence were magnetite and titanomagnetite of low and/or intermediate Curie-temperature. Hysteresis parameter ratios showed a pronounced variability across the flow. Analyses of frequency dependent susceptibility, IRM acquisition coercivity spectra and FORCs showed a noticeably presence of very low coercivity grains (multidomain and superparamagnetic-single domain boundary). Multimethod palaeointensity experiments were performed with the Thellier-Coe, multispecimen and Tsunakawa-Shaw methods. Only three of 25 cores from the flow yielded successful Thellier-Coe determinations, in agreement with the expected field value of 38.7 μT (IGRF-13). However, palaeointensities of 60 per cent of the specimens agree with the expected value performing an informal analysis without considering criteria thresholds. Four of six Tsunakawa-Shaw determinations performed on samples from the flow yielded correct results, but three multispecimen determinations providing apparently successful determinations largely underestimate the expected field intensity. Combination of three Thellier-Coe and four Tsunakawa-Shaw successful determinations yields a multimethod palaeointensity result B = (36.9 ± 2.0) μT in good agreement with the expected field intensity.en
dc.description.sponsorshipThis work was funded by project PID2019-105796GB-100/AEI/10.13039/501100011033 (Spanish Agencia Estatal de Investigación), project BU037P23 (Junta de Castilla y León and the European Research and Development Fund, ERDF) and JSPS KAKENHI Grant No. 21H01171. We thank Antonio González (Cabildo de La Palma) for his invaluable support and help during our visit to the island of La Palma. We also wish to thank Dr Eugenio Fraile Nuez (IEO-CSIC) for providing us the submarine lava flow samples. We also wish two thank two anonymous reviewers for helpful comments.en
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherOxford University Presses
dc.relation.ispartofGeophysical Journal International. 2024, V. 239, n. 2, p. 841-861es
dc.rightsAtribución 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectPalaeointensityen
dc.subjectRock and mineral magnetismen
dc.subjectPalaeomagnetismen
dc.subjectOceanic hotspots and intraplate volcanismen
dc.subject.otherPaleomagnetismoes
dc.subject.otherPaleomagnetismen
dc.subject.otherPaleontologíaes
dc.subject.otherPaleontologyen
dc.subject.otherMagnetismoes
dc.subject.otherMagnetismen
dc.subject.otherArqueologíaes
dc.subject.otherArchaeologyen
dc.titleReliability of the palaeomagnetic signal recorded in a lava flow erupted on 4 December 2021 in La Palma (Canary Islands, Spain)en
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.1093/gji/ggae297es
dc.identifier.doi10.1093/gji/ggae297
dc.identifier.essn1365-246X
dc.journal.titleGeophysical Journal Internationales
dc.volume.number239es
dc.issue.number2es
dc.page.initial841es
dc.page.final861es
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones


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