Timing of LGM and deglaciation in the Southern Swiss Alps

Scapozza, Cristian; Castelletti, Claudio; Soma, Linda; Dall’Agnolo, Stephan; Ambrosi, Christian

doi:10.4000/geomorphologie.10753

Cited by 28 publications

(19 citation statements)

References 32 publications

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“…This is true for both the northern as well as the southern valleys. Scapozza et al (2015) note that during the early Lateglacial Cugnasco stadial the Ticino glacier was calving into the paleo-lake Verbano.…”

Section: Discussionmentioning

confidence: 99%

“…The moraines formed during the last glaciation are distinguished from older morphologically less distinct outboard moraines attributed to penultimate glacier expansions during MIS 6 or 8 (Graf, 2009;Keller and Krayss, 2010;Preusser et al, 2011;Fiebig et al, 2011;Gianotti et al, 2015). Records from sites on both the northern and southern side of the Alps suggest advance of glaciers beyond the Alpine front at around 30 ka ago (Keller and Krayss, 2005;Monegato et al, 2007;Scapozza et al, 2015). Ehlers and Gibbard (2004) During the Last Glacial Maximum in the European Alps (late Würm) local ice caps and extensive ice fields in the high Alps fed huge outlet glaciers that occupied the main valleys, for example, the Rhone, Reuss, Rhine, Inn, and Salzach in the northern sector and the Tagliamento, Piave, Sarca, Ticino, Dora Baltea, and Dora Riparia along the southern side ( Figs.…”

Section: Last Glacial Maximum Stadials and Terminationmentioning

confidence: 99%

“…Similar 10 Be ages were obtained for the timing of construction of the LGM moraine in the Gesso River valley in the Italian Maritime Alps (Federici et al 2011;submitted). Based on a compilation of radiocarbon dates, Scapozza et al (2015) estimate that the Ticino and Adda glacers reached their LGM furthest extent between 28.5 and 22.9 ka cal BP. At Lake Iseo, ice-free conditions after downwasting of the Oglio glacier ensued no later than 18.6 to 17.9 ka cal BP (Ravazzi et al, 2012;Baroni et al, 2014).…”

Section: The Moraine Indicated By the Upper Red Arrow Is At 950 M Amentioning

confidence: 99%

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Glacier variations in the European Alps at the end of the last glaciation

Ivy‐Ochs¹

2015

CIG

163

118

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Section: Discussionmentioning

confidence: 99%

Section: Last Glacial Maximum Stadials and Terminationmentioning

confidence: 99%

Section: The Moraine Indicated By the Upper Red Arrow Is At 950 M Amentioning

confidence: 99%

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Glacier variations in the European Alps at the end of the last glaciation

Ivy‐Ochs¹

2015

CIG

163

118

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“…Finally, a chronological attribution (i.e. the definition of the minimum age for each glacial stadial; Table 3) was performed by means of radiocarbon dating compilation and calibration, the correlation with the North Greenland Ice Core Project (NGRIP) isotopic records and the correlation with the Eastern Alps analogues of the regional glacial stadials, as proposed by Scapozza et al (2014).…”

Section: Case Study 2: Multi-methods Assessment Of Slope Tectonics Actmentioning

confidence: 99%

Improvements in 3-D digital mapping for geomorphological and Quaternary geological cartography

Ambrosi¹,

Scapozza²

2015

Geogr. Helv.

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Abstract. In recent decades, GIS tools have been directly applied to photo-interpretative geomorphological and geological mapping. Although these tools are powerful and effective tools in the creation of digital maps, it is often very difficult to obtain a correct recognition of the nature and boundaries of geomorphological landforms using two-dimensional images. In addition, the output typically requires some improvements, usually by means of field verifications or using oblique field photographs. The aim of this paper is to present the ArcGDS ™ tool, which allows the direct exploitation, visualization and digitization of stereoscopic digital linear scanned images (e.g. digital image strips, © swisstopo). Through two case studies, we show how 3-D digital mapping makes it possible to produce Quaternary geological and geomorphological maps with a limited complementary fieldwork approach and to provide a quantitative assessment of surface deformations through the acquisition of precise elevation coordinates. Combined with high-resolution digital elevation models, ArcGDS ™ is a powerful tool, particularly over large areas, as well as under forest cover and on very steep slopes.

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“…Chronological constraints (radiocarbon dating and biological proxies) are scarce and the few data available are mostly related to the Lateglacial (see Scapozza et al . for a synthesis). The present study is focused on the Orta moraine amphitheatre, which encircles Lake Orta in north Italy and portrays part of the major Toce‐Ticino Glacier lobe.…”

mentioning

confidence: 99%

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

Braakhekke

Ivy‐Ochs

Monegato

et al. 2020

Boreas

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Knowledge of the glacial chronologies for the Last Glacial Maximum (LGM) helps in understanding the interactions between climate, topography and glacier development. In this sense, the investigation of the Lake Orta moraine amphitheatre (Alpine foreland, northern Italy) allowed spatial and temporal reconstruction of the Orta Glacier. The end‐moraine system was investigated by means of geomorphological field surveys, analysis of 13 rock samples for cosmogenic 10Be and 36Cl concentrations, and remote sensing analysis. The dating results indicate that the age of the outer moraine belt is concordant with the LGM culmination at 26.5–23 ka, as found in other amphitheatres in the Alps. This new age estimate of the outermost moraines shows that the maximum extent of the Orta Glacier during the LGM was significantly bigger than recently suggested. A younger stabilization phase of the glacier front at about 19 ka indicates that the onset of the withdrawal of glaciers from the lower Alpine valleys started later. Provenance analysis of the boulders shows that the greatest contribution of ice to the Orta Glacier came from the Anzasca Valley rather than the major Ossola Valley. This reflects the closeness (about 45 km) to the foreland of the high‐elevated accumulation area of the Monte Rosa massif (4634 m a.s.l.), whose eastern glacier seems to have reached the lower valley faster than the trunk Toce Glacier. This fact underlines the key role played by high‐elevation accumulation areas that are located close to the foreland in controlling the path and geometry of major glaciers in the Alps.

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Timing of LGM and deglaciation in the Southern Swiss Alps

Cited by 28 publications

References 32 publications

Glacier variations in the European Alps at the end of the last glaciation

Glacier variations in the European Alps at the end of the last glaciation

Improvements in 3-D digital mapping for geomorphological and Quaternary geological cartography

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

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