La topographie glaciaire en Auvergne

Boule, Marcellin

doi:10.3406/geo.1896.6883

Cited by 9 publications

(9 citation statements)

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“…The majority of ice was located at the poles, but evidence of glaciation has been found at mid-latitude, between 35°N and 50°N, in the Northern Europe. The region of the Cantal in the Massif Central in France was glaciated during this period ( (Boule, (1896), Veyret, (1973, Valadas and Veyret, (1981)); Fig. 3).…”

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 96%

“…The study of these erosion and deposit patterns indicate that the Cantal was glaciated during the last maximum glacial period (Fig. 4; (Etlicher and Hervé, 1988)) The glacial landscape was, 12 My ago, composed of glacial cirques, glacial valleys and local plateaus ice cap on the planèze where their flat topography were favourable to a deposition and accumulation of ice (Boule, 1896, Veyret, 1973, Valadas and Veyret, 1981, Etlicher and Hervé, 1988. Today, the area is totally deglaciated, but the Cantal is still shaped by geomorphologic legacy of an old cold climate 12 My ago.…”

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

“…The Cantal is a stratovolcano which had been built by accumulation of lava from eruptions between 13 My to 2 My (Valadas and Veyret, 1981). The Cantal's morphology is shaped by vast basaltic plateaus formed by basaltic eruptions, these plateaus are called "planèze" (Boule, 1896). These planèze have a mean elevation of 1300 m and are cut by valleys which often start with an amphitheatre (Fig.…”

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

“…3b). These valleys and amphitheatres have been identified by Boule (1896) as glacial landscape composed of glacial valleys and glacial cirques. Moreover, Boule (1896) and Veyret (1973) found several patterns of glacial erosion such as:…”

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

“…9). The Cantal is volcanic region where evidence of past glaciation has been identified (Boule, 1896, Durand, 1939, Veyret, 1973, Valadas and Veyret, 1981. The fact that this area is totally ice-free and the basaltic composition make this region a good analogue for Mars.…”

Section: Comparison With the Earthmentioning

confidence: 99%

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Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

et al. 2020

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In a previous study, we demonstrated with a comparative morphometrical analysis the first morphometric evidence of a glacial landscape composed of glacial cirques and glacial valleys in the south of Terra Sabaea at an elevation > 1000 m in two impact craters and one mountain. The purpose of this study is to use the same method to seek other geomorphologic evidence of glacial landscapes elsewhere in Terra Sabaea. Based on a comparison between current and old glacial landscapes on Earth and Mars, we identified 81 glacial valleys and possible evidence for a former plateau ice cap dated at 3.6 Ga at the highest elevation in Terra Sabaea. The identified glacial valleys have the same morphometric properties as terrestrial and martian glacial valleys with U-shaped cross-sectional profiles, a V-index > 0.2, a length to with ratio > 1 and a cross-sectional area to drainage area ratio four times higher than the fluvial ones. Moreover, these properties are different from terrestrial and martian fluvial valleys. We did not find well preserved glacial cirques in this area, this absence questions the origin of glacial valleys. However, the presence of an extensive flat plateau, from which the long valleys radiate, could have hosted an ancient plateau ice cap which was the source of these glacial valleys. A comparison with the Cantal and the Shaluli Shan in the southeastern Tibetan plateau on Earth reveals morphometrical similarities with our study area. In fact, long glacial valleys, originating radially from a plateau at higher elevation are characteristics of an ancient plateau ice cap. This analysis allowed us to propose a polythermal regime for martian glacial landscape, namely a cold-based ice cap except at the margin where the regime is warmed-based due to the steeper topography. This topography created shear stress which increased the heat at the base of the ice and created the outlet glacial valleys. Near the plateau, the radial valleys are U-shaped with a V-index > 0.2 but downstream, to the low elevation area, these valleys become more V-shaped with a V-index around 0.1. This hypothesis is supported by the presence of an open-basin paleolake making the transition between inlet glacial valleys upstream and an outlet V-shaped valley downstream. So the morphometry of the radiating valleys suggests that liquid water played a role in the formation of this landscape.

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Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 96%

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

Section: Paleoglaciation On Earth: Example From the Cantal In French mentioning

confidence: 99%

Section: Comparison With the Earthmentioning

confidence: 99%

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Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

et al. 2020

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Deglaciation and postglacial evolution of the Cère Valley (Cantal, French Massif Central) based on geomorphological mapping, ³⁶Cl surface exposure dating and glacier modelling

Ancrenaz

Pochat

Rinterknecht

et al. 2023

J Quaternary Science

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The landform assemblage in the Cère Valley (Cantal, France) provides one of the most complete sequences for Late Pleistocene glacial fluctuations in the French Massif Central. However, the associated glacial chronology has been debated since the 1980s. This paper aims to improve the glacial chronology of the Cère Valley using 36Cl surface exposure ages. Geomorphological results define two glacier stadials with reconstructed equilibrium line altitudes of 1078 ± 43 and 1152 ± 34 m above sea level. These results are comparable to those obtained in the Alps or the Pyrenees during the Last Glacial Maximum (26–19.5 ka). However, 36Cl surface exposure ages are centred around the Younger Dryas (YD), between 13 and 11 ka (n = 4). We suggest that these 36Cl ages are not related to a standstill during the YD but rather to the effects of the postglacial evolution of the Cère Valley. We investigate two geomorphological end‐member scenarios to explain the postponed exposure of sampled boulders: the Aurillac Lake scenario and the later fluvial incision scenario. While the nature of the geomorphological events leading to the boulder exhumation is not fully resolved, we highlight a long phase of postglacial evolution in the Cère Valley.

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Glacial Erosion in France, Switzerland and Norway

Davis¹

1972

Glaciers and Glacial Erosion

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La topographie glaciaire en Auvergne

Cited by 9 publications

References 0 publications

Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

Deglaciation and postglacial evolution of the Cère Valley (Cantal, French Massif Central) based on geomorphological mapping, ³⁶Cl surface exposure dating and glacier modelling

Glacial Erosion in France, Switzerland and Norway

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La topographie glaciaire en Auvergne

Cited by 9 publications

References 0 publications

Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

Glacial landscape and paleoglaciation in Terra Sabaea: Evidence for a 3.6 Ga polythermal plateau ice cap

Deglaciation and postglacial evolution of the Cère Valley (Cantal, French Massif Central) based on geomorphological mapping, 36Cl surface exposure dating and glacier modelling

Glacial Erosion in France, Switzerland and Norway

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Deglaciation and postglacial evolution of the Cère Valley (Cantal, French Massif Central) based on geomorphological mapping, ³⁶Cl surface exposure dating and glacier modelling