Constraining the age of superimposed glacial records in mountain environments with multiple dating methods (Cantabrian Mountains, Iberian Peninsula)

QUATERNARY SCIENCE REVIEWS

卷:195

Article

Rodriguez-Rodriguez, Laura¹  Jose Dominguez-Cuesta, Maria²  Rinterknecht, Vincent¹  Jimenez-Sanchez, Montserrat²  Gonzalez-Lemos, Saul²  Leanni, Laetitia³  Sanjurjo, Jorge⁴  Ballesteros, Daniel^5,6  Valenzuela, Pablo²  Llana-Funez, Sergio² 

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

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

[3] Aix Marseille Univ, CNRS, CEREGE UM34, IRD,INRA,Coll France, Technopole Environm Arbois Mediterranee,BP80, F-13545 Aix En Provence, France

[4] Univ A Coruna, Inst Univ Xeoloxia Isidro Parga Pondal, Castro Elvina S-N, La Coruna 15008, Spain

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

[6] CNRS, Mont St Aignan, France

关键词: Be-10 surface exposure dating;    Radiocarbon;    Optically stimulated luminescence;    Last glacial maximum;    Cantabrian mountains;    Iberian peninsula;    Glaciation;   

DOI  :  10.1016/j.quascirev.2018.07.025

来源: Elsevier

【 摘 要 】

Numerous cases of timing differences between glacier advances recorded in mountain environments have been documented over the last decade, usually suggesting potential age conflicts between the different dating techniques. The frequent use of a single technique to date numerically a given glacial sequence makes it difficult to address to what extent age differences can be an artifact related to biased numerical age results or a paleoclimate signature. Here we present a new set of 43 numerical ages based on three dating techniques -Be-10 surface exposure dating; radiocarbon; and optically stimulated luminescence-that complement the chronology of Pleistocene glacial advances in the Porma valley, in the central Cantabrian Mountains of Spain. Results compliment previous chronologies in the area, supporting an important glacial advance during Marine Isotope Stage 3 (Stage Ila: similar to 56 ka) that culminated with the Last Glacial Maximum advance (Stage llb: similar to 33-24 ka) of MIS 2 in response to increased rainfall and solar insolation minima. Glacier fronts reached elevations as low as 1130 m a.s.l. possibly without overriding evidence related to the previous Pleistocene glacial maximum extent. Glacier recession in the Cantabrian Mountains started at 21-20 ka ago, after the global LGM. We suggest that the recession was initiated by increased insolation followed by hyper-cool and dry conditions during Heinrich Stadial 1 in response to meltwater discharges in the North Atlantic. (C) 2018 Elsevier Ltd. All rights reserved.

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