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Glacial oscillations during the Bølling–Allerød Interstadial–Younger Dryas transition in the Ruda Valley, Central Pyrenees
- Source :
- Journal of Quaternary Science, Journal of Quaternary Science, 2021, 37 (1), pp.42-58. ⟨10.1002/jqs.3379⟩, Journal of Quaternary Science, Wiley, 2021, ⟨10.1002/jqs.3379⟩
- Publication Year :
- 2021
- Publisher :
- Wiley, 2021.
-
Abstract
- International audience; The Upper Garonne Basin included the largest glacial system in the Pyrenees during the last glacial cycle. Within the long-term glacial retreat during Termination-1 (T-1), glacier fluctuations left geomorphic evidence in the area. However, the chronology of T-1 glacial oscillations on the northern slope of the Central Pyrenees is still poorly constrained. Here, we introduce new geomorphological observations and a 12-sample dataset of 10Be Cosmic-Ray Exposure (CRE) ages from the Ruda Valley. This U-shaped valley, surrounded by peaks exceeding 2800 m a.s.l., includes a sequence of moraines and polished surfaces that enabled to reconstruct the chronology of the last deglaciation. Following the maximum ice extent, warmer conditions prevailing at ~15-14 ka, during the Bølling-Allerød (B-A) Interstadial, favoured glacial retreat in the Ruda Valley. Within the B-A, glaciers experienced two phases of advance/stillstand with moraine formation at 13.5 and 13.0 ka. During the early YD, glacial retreat exposed the highest surfaces of the Saboredo Cirque (~2300-2350 m) at 12.7 ka. Small glaciers persisted only inside the highest cirques (~2470 m), such as in Sendrosa Cirque, with moraines stabilizing at 12.6 ka. The results of this work present the most complete chronology for Pyrenean glacial oscillations from the B-A to the YD.
- Subjects :
- Younger Dryas
010504 meteorology & atmospheric sciences
Bølling–Allerød
010502 geochemistry & geophysics
01 natural sciences
Paleontology
Bølling-Allerød
Arts and Humanities (miscellaneous)
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Cosmic‐ray exposure dating
Earth and Planetary Sciences (miscellaneous)
Deglaciation
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Glacial period
Stadial
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Cosmic-Ray Exposure dating
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Central Pyrenees
Geology
Subjects
Details
- ISSN :
- 10991417 and 02678179
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Journal of Quaternary Science
- Accession number :
- edsair.doi.dedup.....02bc958fc690a399f4d522486efa861e