Resumen de Fluctuaciones glaciares durante la deglaciación del Pleistoceno Superior en el Pirineo central español
José María García Ruiz, David Palacios Estremera, Nuria de Andrés de Pablo, Juan Ignacio López Moreno, Yasmina Sanjuan, Blas Lorenzo Valero Garcés
Glacial fluctuations during the Late Pleistocene in the Central Pyrenees was studied using 36Cl cosmogenic dating of moraine and rock glacier boulders, and polished bedrocks. This allowed us to establish a sequence of stadial and interstadial events in the headwater of the Gállego River basin and in the Marboré Cirque. Results demonstrate: (i) the rapid glacial retreat after the LGM; (ii) the great sensitivity of small glaciers to climatic variability; (iii) the occurrence of re-advances within a general deglaciation process, during Greenland Stadial-1 (the Oldest and Younger Dryas); (iv) glacial retreat was very rapid during the Bolling/Allerod (Greenland Interstadial). Late Holocene recorded glacial fluctuations in the uppermost parts of the Pyrenees: re-advance at Mid Holocene, a general retreat during the Bronze/Iron Ages, a short expansion during the Dark Ages, a melting period during the Mediaeval climatic Anomaly and a glacial expansion during the Little Ice Age.
