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| Titel |
Timing of Pleistocene glacial oscillations recorded in the Cantabrian Mountains (North Iberia): correlation of glacial and periglacial sequences from both sides of the range using a multiple-dating method approach |
| VerfasserIn |
Laura Rodríguez-Rodríguez, Montserrat Jiménez-Sánchez, María José Domínguez-Cuesta, Vincent Rinterknecht, Raimon Pallàs, Didier Bourlès |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112087
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| Publikation (Nr.) |
 EGU/EGU2015-12243.pdf |
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| Zusammenfassung |
| The Cantabrian Mountains is a coastal mountain range up to 2648 m altitude located at 43oN
latitude and directly influenced by the North Atlantic climate oscillations. Although
nowadays it is fully deglaciatied, glacial sediments and landforms are clearly preserved
elsewhere above 1600 m. Particularly, glacial evidence in the central Cantabrian Mountains
suggests the formation of an icefield in the headwaters of the Porma and Esla catchments
drained by glaciers up to 1-6 km in length in the northern slope and 19 km-long in the
southern slope, with their fronts at minimum altitudes of 900 and 1150 m asl respectively
(Rodríguez-Rodríguez et al., 2014). Numerical ages obtained from the base of the
Brañagallones ice-dammed deposit and one of the lateral moraines that are damming
this deposit suggest that the local glacial maximum was prior to ca 33.5 cal ka
BP in the Monasterio Valley (see data compiled in Rodriguez-Rodríguez et al., in
press).
Currently, our research is focused on developing a full chronology of glacial oscillations
in both sides of the range and investigating their paleoclimate significance and relationship
with glacial asymmetry through the combined use of surface exposure, OSL and radiocarbon
dating methods. In this work, we present 47 10Be surface exposure ages obtained from
boulders in moraines, glacial erratic boulders and rock glaciers in the Monasterio and
Porma valleys. The glacial record of these valleys was chosen because of: (i) its
good preservation state; (ii) the occurrence of a quartz-rich sandstone formation;
and (iii) the availability of previous 14C and OSL numerical ages. Sampling sites
were selected considering the relative age of glacial stages to cover as complete as
possible the history of Pleistocene glaciations in the studied area, from the glacial
maximum stage to the prevalence of periglacial conditions. Preliminary results
suggest the occurrence of several glacial advances of similar extent at ca 150 -
50 ka followed by a deglaciation sequence that changed gradually to periglacial
conditions during the Lateglacial (16 - 12 ka). Radiocarbon and OSL sampling
campaigns have been recently developed to complement and cross-check these
preliminary results, which are compared with other paleoclimate proxies in this
contribution.
Rodríguez-Rodríguez, L., Jiménez-Sánchez, M., Domínguez-Cuesta, M.J., 2014.
Geophysical Research Abstracts 16, EGU2014-292.
Rodríguez-Rodríguez, L., Jiménez-Sánchez, M., Domínguez-Cuesta, M.J., Aranburu,
A., in press. Quaternary International, http://dx.doi.org/10.1016/j.quaint.2014.06.007
Research funded by MINECO-PGE-FEDER through the project CANDELA
(MINECO-CGL2012-31938). Laura Rodríguez-Rodríguez developed her research
granted by the Spanish FPU Program (Ministerio de Educación Cultura y Deporte). |
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