Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)

Rossato, Sandro; Mozzi, Paolo

doi:10.1016/j.quascirev.2016.07.013

Cited by 25 publications

(39 citation statements)

References 78 publications

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“…At 10 ka valley glaciers were already waned. The collapse of the Alpine glaciers was fast but it occurred at 18-17 ka as reported also by Ravazzi et al (2014) and Rossato and Mozzi (2016).…”

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confidence: 73%

short comment on Anderlini et al

Monegato¹

2020

Preprint

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Dear Authors of the manuscript "New insights into active tectonics and seismogenic potential of the Italian Southern Alps from vertical geodetic velocities". This article is interesting in providing new geodetic data about deformations in this important sector of the Southern Alps. My remarks are related to the general approach that, here and in many similar works, the chronology and Quaternary stratigraphy are used for deformation rates assessment without using updated information about the landscape and sedimentary evolution of the study area. This happens because no geomorphologists or Quaternary stratigraphers are normally involved in such kind of studies. However, C1

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confidence: 73%

short comment on Anderlini et al

Monegato¹

2020

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“…A third small belt located just in the inner position did not provide suitable boulders to date (Fig. 6C), but it should be slightly younger, just before the final collapse of the Alpine glaciers at 18-17.5 ka (Ravazzi et al 2014;Rossato & Mozzi 2016;Wirsig et al 2016). Such an occurrence of multiple phases during the end of the LGM has been widely reported for many endmoraine systems throughout the Alps (e.g.…”

Section: Discussionmentioning

confidence: 78%

“…C), but it should be slightly younger, just before the final collapse of the Alpine glaciers at 18–17.5 ka (Ravazzi et al . ; Rossato & Mozzi ; Wirsig et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…) systems, with final ice‐wastage at about 18–17.5 ka (Ravazzi et al . ; Rossato & Mozzi ; Rossato et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…Considering the presence of several moraines related to the maximum stand of the Orta Glacier, it is likely that a similar twofold scenario took place. The onset of withdrawal after 22 ka has been inferred only through radiocarbon dating in the outwash plain for the Tagliamento (Fontana et al 2014) and the Garda ) systems, with final ice-wastage at about 18-17.5 ka (Ravazzi et al 2014;Rossato & Mozzi 2016;Rossato et al 2018). The second phase at 19 ka recognized in the Orta amphitheatre as a sequence of moraines that can be rightfully ascribed to a glacier stabilization phase.…”

Section: Discussionmentioning

confidence: 99%

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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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