Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/136837
El registro sedimentario del lago Sant Maurici (Pirineos Centrales)
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
[spa] El Lago de St. Maurici (1.004818 E, 42.580801 N, 1924 m s.n.m) se localiza en la zona oriental del 'Parc Nacional d'Aigüestortes i Estany de Sant Maurici', Pirineos Centrales, Catalunya. El lago ocupa una cuenca de sobre- excavación detrás de una morrena terminal. El objetivo de este trabajo es reconstruir la evolución de los ambientes de depósito y su relación con la variabilidad climática desde la deglaciación hasta la actualidad, basándose en un sondeo de 8,7 m de longitud de la zona profunda del lago y un modelo de edad preliminar con tres dataciones AMS 14C. Tras la retirada del glaciar, se sedimentó una secuencia de arenas carbonatadas muy finas y limos arcillosos sin materia orgánica, propios de un lago proglacial. El Holoceno temprano se caracteriza por facies de arenas finas masivas que pasan a facies de limos arenosos laminados con un aumento progresivo del contenido en materia orgánica y con algunas capas de arenas. La secuencia presenta un hiato sedimentario durante el Holoceno medio. Desde el re-inicio de la sedimentación en el Holoceno tardío (ca. 4 ka) se han depositado facies organógenas.
[eng] The St. Maurici Lake (1.004818 E, 42.580801 N, 1924 m a.s.l.) is located in the eastern area of 'Parc Nacional d'Aigüestortes i Estany de Sant Maurici', Central Pyrenees, Catalonia. The lake occupies an overexcavated basin behind a terminal moraine. This paper aims to reconstruct the evolution of depositional environments and their relation to climate evolution since deglaciation to the present, based on a 8.7-m long sequence retrieved in the deepest part of the lake and a preliminary chronological model with three 14C AMS dates. After the glacial retreat carbonatic very fine sands and silts without organic matter were deposited in a proglacial environment. Early Holocene sediments are massive fine sands to laminated sandy silts with increasing organic content and some sand layers. A sedimentary hiatus occurred during the mid Holocene and the sedimentation re-started after ca. 4 ka with deposition of organic facies. Changes in clastic content reflect centennial scale run-off variability during the last millennia.
[eng] The St. Maurici Lake (1.004818 E, 42.580801 N, 1924 m a.s.l.) is located in the eastern area of 'Parc Nacional d'Aigüestortes i Estany de Sant Maurici', Central Pyrenees, Catalonia. The lake occupies an overexcavated basin behind a terminal moraine. This paper aims to reconstruct the evolution of depositional environments and their relation to climate evolution since deglaciation to the present, based on a 8.7-m long sequence retrieved in the deepest part of the lake and a preliminary chronological model with three 14C AMS dates. After the glacial retreat carbonatic very fine sands and silts without organic matter were deposited in a proglacial environment. Early Holocene sediments are massive fine sands to laminated sandy silts with increasing organic content and some sand layers. A sedimentary hiatus occurred during the mid Holocene and the sedimentation re-started after ca. 4 ka with deposition of organic facies. Changes in clastic content reflect centennial scale run-off variability during the last millennia.
Citació
Col·leccions
Citació
CALERO TOMÁS, Miguel Ángel, et al. El registro sedimentario del lago Sant Maurici (Pirineos Centrales). Geogaceta. 2016. Vol. 59, num. 11-14. ISSN 0213-683X. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/136837