L'érosion glaciaire et la formation des vallées alpines

Martonne, Emmanuel De

doi:10.3406/geo.1910.7632

Cited by 25 publications

(9 citation statements)

References 1 publication

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“…Since pioneering works by Brunhes (1906, 1907), De Martonne (1901, 1910, 1911 and Penck andBrückner (1904, 1906), increasing attention has been paid to the geomorphological evolution of high latitude or high altitude landscapes that have experienced overall disequilibrium induced by the transition from glacial to non-glacial conditions. During this paraglacial transition, defined as the adjustment of deglaciated landscapes to non-glacial conditions (Ryder, 1971;Church and Ryder, 1972;Ballantyne, 2002;Mercier, 2008Mercier, , 2011, one of the dominant paraglacial readjustment processes operates in the form of deep-seated, large scale and slow motion rock mass deformation.…”

Section: Introductionmentioning

confidence: 99%

Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: impact on glacial landscapes in Tröllaskagi, northern Iceland

Coquin

Mercier

Bourgeois

et al. 2015

Quaternary Science Reviews

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Section: Introductionmentioning

confidence: 99%

Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: impact on glacial landscapes in Tröllaskagi, northern Iceland

Coquin

Mercier

Bourgeois

et al. 2015

Quaternary Science Reviews

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“…The extent of the glacial cover and the erosive power of the processes operating during the advance and retreat of the ice‐front at the scale of the northern hemisphere is acknowledged as playing an important part in denudation at the Earth's surface (e.g. De Martonne, ). For example, the high rates of sediment export to the ocean caused by catastrophic events in Northern Europe involved ancient rivers (e.g.…”

Section: Introductionmentioning

confidence: 99%

Inferring denudation variations from the sediment record; an example of the last glacial cycle record of the Golo Basin and watershed, East Corsica, western Mediterranean sea

et al. 2012

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International audienceGeophysical data and sampling of the Golo Basin (East Corsica margin) provide the opportunity to study mass balance in a single drainage system over the last 130 kyr, by comparing deposited sediments in the sink and the maximum eroded volume in the source using total denudation proxies. Evaluation of the solid sediments deposited offshore and careful integration of uncertainties from the age model and physical properties allow us to constrain three periods of sedimentation during the last climatic cycle. The peak of sedimentation initiated during Marine Isotopic Stage (MIS) 3 (ca. 45 ka) and lasted until late in MIS 2 (ca. 18 ka). This correlates with Mediterranean Sea palaeoclimatic records and the glaciation in high altitude Corsica. The yield of solid sediment into the Golo Basin drops in the observed present day Mediterranean basins (gauging stations), whereas the palaeo-denudation estimate derived from the sediments over the last glacial period is one to ten times higher than that predicted using cosmogenic or thermochronometer estimates of exhumation. The catchment-wide denudation rate calculated from deposited solid sediment ranges from 47 to 219 mm kyr−1, which is higher than the estimate from palaeosurface ablation in the proximal part of the source (9-140 mm kyr−1) and lower than the distal, narrow, incised channel of the Golo River (160-475 mm kyr−1). This mismatch raises questions about the investigation of denudation at millennial-time scale (kyr) and at higher integrating times (Myr) as a reliable tool for determining the effect of climate change on mountain building and on sedimentary basin models

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“…But the glaciers must slip actively along their side walls for this erosion to occur. Our present evidence suggests that this active side-slip occurs below ice falls where wide and deep rock basins are known to occur 13 . However, the boulder that was jammed against the rock wall at “East End” station and did not move could have accomplished no material erosion.…”

Section: Glacial Erosionmentioning

confidence: 63%

Measurements of Side-slip at Austerdalsbreen, 1959

Glen

Lewis

1961

J. Glaciol.

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Measurements have been made using two different methods of the rate at which the glacier Austerdalsbreen is slipping past its side wall at four sites. The rate of slipping varies from site to site in a way which seems to be connected with the details of glacier flow in the neighbourhood, and in all cases is less than the slip previously measured further up-glacier at the foot of one of the ice falls, and is also a smaller fraction (about one sixth) of the flow rate in the centre of the glacier. One of the methods measured the velocity of the last metre of ice, and this method gave movements which were more erratic than the other method, which measured velocity a few metres from the edge. This suggests that protuberances of rock and boulders lodged between the ice and the rock wall cause local variations in flow which are smoothed out in a few metres. The results are discussed in connection with the process of glacial erosion.

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L'érosion glaciaire et la formation des vallées alpines

Cited by 25 publications

References 1 publication

Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: impact on glacial landscapes in Tröllaskagi, northern Iceland

Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: impact on glacial landscapes in Tröllaskagi, northern Iceland

Inferring denudation variations from the sediment record; an example of the last glacial cycle record of the Golo Basin and watershed, East Corsica, western Mediterranean sea

Measurements of Side-slip at Austerdalsbreen, 1959

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