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http://hdl.handle.net/2183/24741 Los derrubios estratificados holocenos de Praón (Picos de Europa, Montañas Cantábricas)
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Cadernos do Laboratorio Xeolóxico de Laxe: Revista de xeoloxía galega e do hercínico peninsular, ISSN 0213-4497, Nº 41, 2019, páxs. 23-46
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[Resumen] En este artículo se estudian los derrubios estratificados y cementados presentes en Praón,
un sector de la baja montaña de los Picos de Europa. La realización de trabajo de campo
sistemático ha permitido establecer el contexto geomorfológico en el que están insertos los
derrubios estudiados, caracterizándolos desde el punto de vista sedimentológico. Se han obtenido
dos edades 14C en restos de gasterópodos insertos a 4 metros (10.775 ± 325 años cal
BP) y a 1,7 metros (5.175 ± 135 años cal BP) de profundidad, infiriendo las condiciones de
precipitación del cemento carbonatado a partir de la realización de análisis isotópicos. Estas
condiciones habrían sido más frías para la muestra más antigua y mucho más cálidas para
la más reciente. Los resultados de este trabajo evidencian que, derrubios estratificados como
los estudiados, los cuales son abundantes en el área de los Picos de Europa, podrían haberse originado en condiciones climáticas diversas y no necesariamente de frío extremo, ni exclusivas
de ambientes periglaciares sensu stricto, no teniendo tampoco por qué corresponderse,
desde el punto cronológico, con el Tardiglaciar (en cronologías de 14 a 10 ka), el periodo frío
al que tradicionalmente han sido adscritos de forma relativa en las Montañas Cantábricas
[Abstract] In this paper we study the stratified and cemented scree located in Praón, a low mountain sector of the Picos de Europa (Cantabrian Mountains). The field work has allowed to establish the geomorphological context in which the studied stratified scree are inserted, characterizing them from the sedimentological point of view. 14C ages have been obtained in remains of gastropods found at 4 meters deep (10.775 ± 325 years cal BP) and 1.7 meters deep (5.175 ± 135 years cal BP). Moreover, the precipitation climate conditions of carbonated cement have been obtained measuring the isotope ratio of both samples. These conditions would be colder for the oldest sample and warmer for the recent one. The results of this study show that stratified scree such as those studied, which are abundant in the area of the Picos de Europa, could have been originated in relation to diverse climatic conditions, and that they do not necessarily have to correspond, from the chronological point of view, with the cold stage of Lateglacial (14 to 10 ka) to which traditionally they have been assigned through relative chronology, in the Cantabrian Mountains
[Abstract] In this paper we study the stratified and cemented scree located in Praón, a low mountain sector of the Picos de Europa (Cantabrian Mountains). The field work has allowed to establish the geomorphological context in which the studied stratified scree are inserted, characterizing them from the sedimentological point of view. 14C ages have been obtained in remains of gastropods found at 4 meters deep (10.775 ± 325 years cal BP) and 1.7 meters deep (5.175 ± 135 years cal BP). Moreover, the precipitation climate conditions of carbonated cement have been obtained measuring the isotope ratio of both samples. These conditions would be colder for the oldest sample and warmer for the recent one. The results of this study show that stratified scree such as those studied, which are abundant in the area of the Picos de Europa, could have been originated in relation to diverse climatic conditions, and that they do not necessarily have to correspond, from the chronological point of view, with the cold stage of Lateglacial (14 to 10 ka) to which traditionally they have been assigned through relative chronology, in the Cantabrian Mountains