New geomorphological and chronological constraints for glacial deposits in the Rivoli-Avigliana end-moraine system and the lower Susa Valley (Western Alps, NW Italy)

Ivy-Ochs, Susan; Lucchesi, Stefania; Baggio, Paolo; Fioraso, Gianfranco; Gianotti, Franco; Monegato, Giovanni; Graf, Angela A.; Akçar, Naki; Christl, Marcus; Carraro, Francesco; Forno, Maria Gabriella; Schlüchter, Christian (2018). New geomorphological and chronological constraints for glacial deposits in the Rivoli-Avigliana end-moraine system and the lower Susa Valley (Western Alps, NW Italy). Journal of quaternary science JQS, 33(5), pp. 550-562. John Wiley & Sons, Ltd. 10.1002/jqs.3034

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Our new dataset from the Rivoli‐Avigliana end‐moraine system, the westernmost amphitheatre of the Italian Alps, provides an important step towards understanding foreland‐reaching glaciations before and during the Last Glacial Maximum (LGM) in the Western Alps. 10Be data from six boulders in pre‐LGM deposits gave ages between 26.8 ± 2.1 and 41.2 ± 1.9 ka. Based on morphological and pedological data, we interpret the oldest age as a minimum age for the glacier advance(s). 10Be results suggest that the LGM occurred in two major steps. During the first at 24.0 ± 1.5 ka, several ridges were constructed demonstrating oscillation of the Dora Riparia glacier snout at the maximum position. Our data demonstrate a significantly larger LGM extent in the Rivoli‐Avigliana amphitheatre than shown on previous maps. The maximum advance was followed by a short re‐advance of the glacier at 19.6 ± 0.9 ka, as recorded by 10Be ages from boulders in lateral positions along the lower Susa Valley. The maximum ice surface during the LGM was at 1000–920 m a.s.l. in the final reach of the valley (560–620 m of elevation above the alluvial plain) and at 620–340 m a.s.l. at the continuous moraines in the amphitheatre.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Exogenous Geology
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

UniBE Contributor:

Akçar, Naki and Schlüchter, Christian

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0267-8179

Publisher:

John Wiley & Sons, Ltd.

Language:

English

Submitter:

Naki Akçar

Date Deposited:

28 Nov 2019 09:59

Last Modified:

28 Nov 2019 09:59

Publisher DOI:

10.1002/jqs.3034

BORIS DOI:

10.7892/boris.135178

URI:

https://boris.unibe.ch/id/eprint/135178

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