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Title:
Last Glacial Maximum Dated by Means of 10Be in the Maritime Alps (Italy)
Authors:
Granger, D. E.; Spagnolo, M.; Federici, P.; Pappalardo, M.; Ribolini, A.; Cyr, A. J.
Affiliation:
AA(Earth and Atmospheric Sciences Department, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051 United States ; ), AB(Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, PISA, PI 56126 Italy ; ), AC(Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, PISA, PI 56126 Italy ; ), AD(Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, PISA, PI 56126 Italy ; ), AE(Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria, 53, PISA, PI 56126 Italy ; ), AF(Earth and Atmospheric Sciences Department, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051 United States ; )
Publication:
American Geophysical Union, Fall Meeting 2006, abstract #H53B-0634
Publication Date:
12/2006
Origin:
AGU
AGU Keywords:
0720 Glaciers, 0776 Glaciology (1621, 1827, 1863), 1105 Quaternary geochronology, 1130 Geomorphological geochronology, 1150 Cosmogenic-nuclide exposure dating (4918)
Abstract Copyright:
(c) 2006: American Geophysical Union
Bibliographic Code:
2006AGUFM.H53B0634G

Abstract

Relatively few exposure dates of LGM moraines boulders are available for the European Alps, and none on the southern flank. Ponte Murato (PM) is a frontal moraine at 860 m asl in the Gesso Basin (Maritime Alps, SW European Alps). The PM moraine dams the 157 km2 Gesso della Barra Valley and it represents the lowermost frontal moraine of the entire Gesso Valley, near the outlet of the valley in the Po Plain. Its ELA, determined from the paleo- shape of the supposed Gesso della Barra glacier, is 1746 m asl. Tetti Bandito (TB) is a small and badly preserved glacial deposit, tentatively attributed to a lateral-frontal moraine, that is positioned 5 km downvalley from the PM deposit at 800 m asl. There are no other glacial deposits downvalley from the TB moraine in the Gesso Basin or farther NE in the piedmont region of the upper Po Plain. Boulders sampled on the PM and on the TB moraine crests gave a 10Be cosmogenic age of respectively 16300 ± 880 ka (average value) and 18798 ± 973 ka. This result constrains the PM frontal moraine within the LGM interval but also suggests that the maximum expansion of the Gesso Basin glacier was more downvalley at some point during the last glaciation. If the TB is a lateral-frontal moraine as supposed, the two TB and PM moraines would represent the outer and inner moraine crests of the same LGM stadial, with the outer moraine much less pronounced than the inner moraine, similarly to the maximalstand and the hochstand described in the Eastern Alps (Van Husen, 1997). Within this perspective, the PM and TB dates are consistent with a European Alps LGM corresponding to MIS 2 (Ivy-Ochs et al., 2004). This study of the Maritime Alps moraines is also in agreement with the Upper Würm climatic theory (Florineth and Schlüchter, 2000) of a stronger influence of the W and SW incoming humid airflows in the European Alps, differently from the nearby Vosges and Pyrenees mountain chains where more dry conditions were probably responsible for a very little glacial expansion during MIS 2 (Seret et al., 1990; Garcia-Ruiz et al., 2003).
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