Paleoenvironmental evolution of Picos de Europa (Spain) during marine isotopic stages 5c to 3 combining glacial reconstruction, cave sedimentology and paleontological findings

QUATERNARY SCIENCE REVIEWS

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Article

Ballesteros, Daniel¹  Alvarez-Vena, Adrian²  Monod-Del Dago, Mael³  Rodriguez-Rodriguez, Laura^4,5  Sanjurjo-Sanchez, Jorge⁶  Alvarez-Lao, Diego²  Perez-Mejias, Carlos⁷  Valenzuela, Pablo⁸  DeFelipe, Irene⁹  Laplana, Cesar¹⁰  Cheng, Hai⁷  Jimenez-Sanchez, Montserrat² 

[1] Univ Rouen Normandie, CNRS, IDEES, UMR 6266, Mont St Aignan, France

[2] Univ Oviedo, Dept Geol, C Jesus Arias de Velasco S-N, Oviedo 33005, Spain

[3] Univ Paris 1 Pantheon Sorbonne, 191 Rue St Jacques, F-75005 Paris, France

[4] CNRS, UMR 8591, Lab Geog Phys, 1 Pl Aristide Briand, F-92195 Meudon, France

[5] Univ Cantabria, Dept Ciencias Tierra & Fis Mat Condensada, Ave Castros 48, Santander 39005, Spain

[6] Univ A Coruna, Univ Inst Geol Isidro Parga Pondal, Campus Elvina S-N, La Coruna 15011, Spain

[7] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China

[8] TRAGSATEC SA, C Julian Camarillo 6B, Madrid 28037, Spain

[9] CSIC, Geosci Barcelona GEO3BCN, C Lluis Sole i Sabaris S-N, Barcelona 08028, Spain

[10] Museo Arqueol Reg Comunidad Madrid, Pza Bernardas S-N, Alcala De Henares 28801, Spain

关键词: Karst;    Glacial reconstruction;    Paleoenvironment;    Pliomys coronensis;    Rupicapra pyrenaica;   

DOI  :  10.1016/j.quascirev.2020.106581

来源: Elsevier

【 摘 要 】

In glaciated areas, the environmental evolution before MIS 2 is usually poorly constrained mainly due to the later glacial erosion during the global Last Glacial Maximum (LGM). However, in carbonate areas, karst caves can preserve records of pre-LGM paleoenvironment. We studied a cave (1350 m altitude) to establish the paleoenvironmental evolution of a glaciated karst area in Picos de Europa (SW Europe). For this objective, a glacial reconstruction, cave sedimentology analyses, and macro- and micromammal remains are com bined with ten U-Th, OSL and AMS C-14 ages. The paleo-glacial reconstruction indicates glaciers descended down to 810-1040 m of altitude covering an area of 36.18 km(2) in the surroundings of Covadonga Lakes during the glacial local maximum, with the equilibrium line altitude located at 1524 +/- 36 m. The geomorphological study of the cave and the U-Th and OSL dates reveal the presence of three allochthonous alluvial sediment sequences at 132-135, 98-60 and ca. 36 ka. These last two sequences would come from the erosion of fluvioglacial sediments including teeth fragments of Pliomys coronensis (=P. lenki), an unusual species in high areas of NW Spain during the Upper Pleistocene. In addition, remains of chamois (Rupicapra pyrenaica) dated in 37-33 cal ka BP constitutes the oldest evidence of chamois above 800 m asl in the region. All the presented data indicate the development of alpine glacier-free areas covered by fluvioglacial sediments at ca. 1450 m altitude at 98-60 and 37-33 ka, corresponding to glacial retreat stages. (C) 2020 Elsevier Ltd. All rights reserved.

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