RT info:eu-repo/semantics/article
T1 The origin and collapse of rock glaciers during the Bølling-Allerød interstadial: A new study case from the Cantabrian Mountains (Spain)
A1 Santos-González, Javier
A1 González-Gutiérrez, Rosa Blanca
A1 Redondo-Vega, José María
A1 Gómez-Villar, Amelia
A1 Jomelli, Vincent
A1 Fernández-Fernández, José M.
A1 Andrés, Nuria
A1 García-Ruiz, José M.
A1 Peña-Pérez, Sergio Alberto
A1 Melón-Nava, Adrián
A1 Oliva, Marc
A1 Álvarez-Martínez, Javier
A1 Charton, Joanna
A1 Palacios, David
A2 Geografia Fisica
K1 Geografía
K1 Geología
K1 Rock glacier
K1 Deglaciation
K1 Paraglacial processes
K1 Cosmic-Ray Exposure dating
K1 Bølling-Allerød interstadial
K1 Cantabrian Mountains
K1 2506 Geología
K1 2505.07 Geografía Física
AB [EN] During the Late Pleistocene, the main mountain ranges of the Iberian Peninsula were covered by small icefields and cirque and alpine glaciers. The deglaciation triggered paraglacial processes that generated landforms, mostly within the ice-free glacial cirques. In this research we analyse the deglaciation process in the Muxivén Cirque (42°15′N – 6°16′W), in the upper Sil River Basin, which includes some of the largest relict rock glaciers of the Cantabrian Mountains. We addressed this objective by means of accurate geomorphological reconstructions, sedimentological analysis, Schmidt-hammer surface weathering measurements and a dataset of 10 10Be Cosmic-Ray Exposure ages. Results reveal that after ~16 ka, glaciers retreated to the bottom of the cirques at the headwaters of the valley, leaving the walls free of ice and triggering rock avalanches onto the remnants of these glaciers. This paraglacial process supplied debris to a small glacier within Muxivén Cirque, which transformed in two rock glaciers. These debris isolated the ice inside the rock glaciers only for a very short period of time and ended up melting completely before the Younger Dryas. The lower sector of the largest one stabilized at 14.5 ± 1.5 ka, while the upper sector remained active until 13.5 ± 0.8 ka. Previous to the stabilization of the lower sector of the northern rock glacier, at its margin a high-energy debris avalanche occurred at ~14.0 ± 0.9 ka. These data agree with previous research, corroborating the paraglacial origin of most Iberian rock glaciers during the Bølling-Allerød interstadial.
PB Elsevier
SN 0169-555X
LK http://hdl.handle.net/10612/14448
UL http://hdl.handle.net/10612/14448
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 27-abr-2024