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Paleomagnetismo y magnetismo de rocas en el relleno sedimentario de la Cova del Gegant (NE Península Ibérica): Variación secular y cambios climáticos durante el Pleistoceno superior

Authors: Beamud, Elisabet; Carrancho, A.; Maestre, Estefanía; Daura, Joan; Sanz, M.; Garcés, Miguel;

Paleomagnetismo y magnetismo de rocas en el relleno sedimentario de la Cova del Gegant (NE Península Ibérica): Variación secular y cambios climáticos durante el Pleistoceno superior

Abstract

La Cova del Gegant presenta una de las pocas secuencias arqueológicas del NE de la Península Ibérica que ha proporcionado restos humanos neandertales asociados a herramientas líticas musterienses, restos de fauna pleistocenos y evidencias de ocupaciones relacionadas con la transición Paleolítico Medio –Superior (Daura et al., 2021 y referencias). El relleno sedimentario de la cueva tuvo lugar entre el MIS 5 y el MIS 2 con eventos de ocupación recurrentes entre el Paleolítico Medio y el Superior (Daura et al., 2021). Este es un momento especialmente interesante para estudiar la evolución de la ocupación humana de la cueva en un contexto de enfriamiento global progresivo y descenso del nivel del mar. Con este objetivo se ha realizado un estudio paleomagnético y de magnetismo de rocas a lo largo de un perfil de 1.37 m en el final de la galería GP2. Se han estudiado 77 muestras orientadas para determinar las direcciones paleomagnèticas e intentar identificar la excursión geomagnética Laschamp (~41 ka). Adicionalmente, se han estudiado las propiedades magnéticas de la fracción < 1mm para relacionar los parámetros magnéticos ( , % fd, IRM, ciclos de histéresis, curvas backfield y curvas termomagnéticas) con cambios en la mineralogía magnética ligados a las oscilaciones climáticas

The Cova del Gegant presents one of the few archaeological sequences in the NE Iberian Peninsula that has yielded Neanderthal human remains associated with Mousterian lithic tools, pleistocene faunal remains and evidence of occupations related to the Middle Paleolithic to Upper Paleolithic transition (Daura et al., 2021 and references therein). The sedimentary filling of the cave took place between MIS 5 and MIS 2 with repeated occupations during Middle and Upper Palaeolithic (Daura et al., 2021). This is a particularly interesting time period to study the evolution of the human occupation of the cave in a context of progressive global cooling and lowering of sea level. With this objective, we have conducted a paleomagnetic and rock magnetism study along a profile of 1.37 m in the reare of GP2 gallery. We have studied 77 oriented samples to determine the paleomagnetic directions aiming to identify the Laschamp geomagnetic excursion, which occurred around 41 ka. Additionally, the magnetic properties of the <1mm fraction were studied to relate the magnetic parameters ( , % fd,, IRM, hysteresis loops, backfield curves and thermomagnetic curves) to changes in the magnetic mineralogy linked to climatic oscillations.

EB y MG agradecen a GGAC 2021 SGR00076 (AGAUR). AC agradece al proyecto PID2019-105796GB-I00 de la Agencia Estatal de Investigación (AEI/10.13039/501100011033). Investigación realizada con el apoyo de la beca postdoctoral Ramon y Cajal (RYC2021-032999-I) del Ministerio de Ciencia e Innovación y la Unión Europea NextGenerationEU (MS); Departament de Cultura de la Generalitat de Catalunya (CLT/2022/ARQ001SOLC/128), AGAUR (SGR2021-00337); Ministerio de Ciencia e Innovación (PID2020-113960GB-100).

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Spain
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Keywords

Neanderthal, Pleistocene, Laschamp, Pleistoceno, Magnetism, Magnetismo, Península Ibérica, Neandertal, Iberian Peninsula

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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