000118058 001__ 118058 000118058 005__ 20230519145515.0 000118058 0247_ $$2doi$$a10.1093/gji/ggab177 000118058 0248_ $$2sideral$$a126214 000118058 037__ $$aART-2021-126214 000118058 041__ $$aeng 000118058 100__ $$0(orcid)0000-0003-1563-6434$$aOliva-Urcia, B. 000118058 245__ $$aMagnetic fabric from Quaternary volcanic edifices in the extensional Bransfield Basin: Internal structure of Penguin and Bridgeman islands (South Shetlands archipelago, Antarctica) 000118058 260__ $$c2021 000118058 5060_ $$aAccess copy available to the general public$$fUnrestricted 000118058 5203_ $$aStudying the magnetic fabric in volcanic edifices, particularly lava flows from recent eruptions, allows us to understand the orientation distribution of the minerals related to the flow direction and properly characterize older and/or eroded flows. In this work, the magnetic fabric from recent (Quaternary) lava flows (slightly inclined in seven sites and plateau lavas in two sites), pyroclastic deposits (two sites from a scoria cone) and volcanic cones, domes and plugs (three sites) from Penguin and Bridgeman islands, located in the Bransfield backarc basin, are presented. The volcanism in the two islands is related to rifting occurring due to the opening of the Bransfield Strait, between the South Shetlands archipelago and the Antarctic Peninsula. The direction of flow of magmatic material is unknown. Rock magnetic analyses, low temperature measurements and electron microscope observations (back-scattered electron imaging and Energy Dispersive X-ray analyses) reveal a Ti-poor magnetite (and maghemite) as the main carrier of the magnetic fabric. Hematite may be present in some samples. Samples from the centre of the lavas reveal a magnetic lineation either parallel or imbricated with respect to the flow plane, whereas in the plateau lavas the magnetic lineation is contained within the subhorizontal plane except in vesicle-rich samples, where imbrication occurs. The magnetic lineation indicates a varied flow direction in Bridgeman Island with respect to the spreading Bransfield Basin axis. The flow direction in the plateau lavas on Penguin Island is deduced from the imbrication of the magnetic fabric in the more vesicular parts, suggesting a SE-NW flow. The volcanic domes are also imbricated with respect to an upward flow, and the bombs show scattered distribution. 000118058 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CTM2014-57119-R$$9info:eu-repo/grantAgreement/ES/MINECO/RTI2018-098099-B-I00 000118058 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000118058 594__ $$a5.7$$b2021 000118058 590__ $$a3.352$$b2021 000118058 592__ $$a1.389$$b2021 000118058 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b35 / 87 = 0.402$$c2021$$dQ2$$eT2 000118058 593__ $$aGeophysics$$c2021$$dQ1 000118058 593__ $$aGeochemistry and Petrology$$c2021$$dQ1 000118058 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000118058 700__ $$aLópez-Martínez, J. 000118058 700__ $$aMaestro, A. 000118058 700__ $$0(orcid)0000-0001-6110-1081$$aGil, A.$$uUniversidad de Zaragoza 000118058 700__ $$aSchmid, T. 000118058 700__ $$aLambán, L.J. 000118058 700__ $$0(orcid)0000-0002-2745-0357$$aGalé, C. 000118058 700__ $$aUbide, T. 000118058 700__ $$0(orcid)0000-0002-3609-7380$$aLago, M. 000118058 7102_ $$12000$$2428$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Interna 000118058 773__ $$g226, 2 (2021), 1368-1389$$pGeophys. j. int.$$tGEOPHYSICAL JOURNAL INTERNATIONAL$$x0956-540X 000118058 8564_ $$s19335031$$uhttps://zaguan.unizar.es/record/118058/files/texto_completo.pdf$$yVersión publicada 000118058 8564_ $$s2861714$$uhttps://zaguan.unizar.es/record/118058/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000118058 909CO $$ooai:zaguan.unizar.es:118058$$particulos$$pdriver 000118058 951__ $$a2023-05-18-15:15:12 000118058 980__ $$aARTICLE