Magnetic anomalies in Bahia Esperanza: a window of magmatic arc intrusions and glacier erosion over the northeastern Antarctic Peninsula

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dc.contributor.author Galindo Zaldívar, Jesús
dc.contributor.author Ruiz Constán, Ana
dc.contributor.author Pedrera Parias, Antonio
dc.contributor.author Ghidella, Marta
dc.contributor.author Montes Santiago, Manuel Jesús
dc.contributor.author Nozal Martín, Francisco de Borja
dc.contributor.author Rodríguez Fernández, Luis Roberto
dc.date.accessioned 2020-10-14T10:23:37Z
dc.date.available 2020-10-14T10:23:37Z
dc.date.issued 2012-09-23
dc.identifier.citation Tectonophysics, vol.585, 2013, 68-76 es_ES
dc.identifier.uri http://hdl.handle.net/20.500.12468/494
dc.description.abstract Bahia Esperanza, constituting the NE tip of the Antarctic Peninsula, is made up of Paleozoic clastic sedimentary rocks overlain by a Jurassic volcano-sedimentary series and intruded by Cretaceous gabbros and diorites. The area is located along the southern part of the Pacific Margin magnetic anomaly belt. Field magnetic researches during February 2010 contribute to determining the deep geometry of the intermediate and basic intrusive rocks. Moreover, the new field data help constrain the regional Pacific Margin Anomaly, characterized up to now only by aeromagnetic and marine data. Field magnetic susceptibility measurements of intrusive intermediate and basic rocks, responsible for magnetic anomalies, ranges from 0.5 × 10− 3 SI in diorites to values between 0.75 × 10− 3 SI and 1.3 × 10− 3 SI in gabbros. In addition, a significant remanent magnetism should also have contributed to the anomalies. The regional magnetic anomaly is characterized by a westward increase from 100 nT up to 750 nT, associated with large intrusive diorite bodies. They probably underlie most of the western slopes of Mount Flora. Gabbros in the Nobby Nunatak determine local residual rough anomalies that extend northwards and westwards, pointing to the irregular geometry of the top of the basic rocks bodies below the Pirámide Peak Glacier. However, the southern and eastern boundaries with the Buenos Aires Glacier are sharp related to deep glacier incision. As a result of the glacier dynamics, magnetic anomalies are also detected north of the Nobby Nunatak due to the extension of the anomalous body and the presence of gabbro blocks in the moraines. The Bahia Esperanza region is a key area where onshore field geological and magnetic research allows us to constrain the shape of the crustal igneous intrusions and the basement glacier geometry, providing accurate data that complete regional aeromagnetic research es_ES
dc.description.sponsorship Departamento de Geodinámica, Universidad de Granada, España es_ES
dc.description.sponsorship Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, España es_ES
dc.description.sponsorship Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, España es_ES
dc.description.sponsorship Géosciences Montpellier, Université Montpellier, Francia es_ES
dc.description.sponsorship Géosciences Montpellier, Centre National de la Recherche Scientifique, Francia es_ES
dc.description.sponsorship Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Instituto Antártico Argentino, Argentina es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.relation POL2006-13836-C03-01 es_ES
dc.relation CSD2006-00041 es_ES
dc.relation CTM2011-30241-C02-02 es_ES
dc.relation CGL2010-21048 es_ES
dc.relation P09-RNM-5388 es_ES
dc.relation RNM148 es_ES
dc.rights Acceso abierto es_ES
dc.subject basic and intermediate intrusive rocks es_ES
dc.subject Pacific Margin Anomaly es_ES
dc.subject field magnetic observations es_ES
dc.subject glacier erosion es_ES
dc.subject Bahía Esperanza es_ES
dc.subject Antártida es_ES
dc.title Magnetic anomalies in Bahia Esperanza: a window of magmatic arc intrusions and glacier erosion over the northeastern Antarctic Peninsula es_ES
dc.type Postprint es_ES
dc.relation.publisherversion https://reader.elsevier.com/reader/sd/pii/S0040195112005665?token=F6C0EA1BC9712692F6F48DC05C4FD9263B91624DA222B0F402377A7490E50C00EEA5ED07375701B97AF821E8B191545D es_ES
dc.identifier.doi https://doi.org/10.1016/j.tecto.2012.09.008 es_ES
dc.coverage.spatialStudy Bahía Esperanza, Antártida es_ES


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