Pétrographie des limons de Provence

Alimen, Henriette

doi:10.3406/quate.1965.979

Cited by 5 publications

(6 citation statements)

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“…Several authors (Bonifay, , ; Alimen et al , ; Chardon, ; Ambert, ) and the 1 : 50 000 geological map (http://infoterre.brgm.fr) mention aeolian sands, loess as well as ventifacts in Provence (south‐east France) (Fig. ).…”

Section: Results and Validation Testsmentioning

confidence: 97%

“…Several factors may be involved: (i) the small size of the loess accumulations, which is below the resolution of the map, (ii) the uneven relief, which favours colluviation and subsequent mixing of sediments, and (iii) the coarse grain size of the loess, showing a main mode between 0.05 and 0.07 mm, i.e . close to the boundary between sand and silt (Alimen et al ., ). For these reasons, it is likely that many points were incorrectly excluded from the map.…”

Section: Results and Validation Testsmentioning

confidence: 99%

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A map of Pleistocene aeolian deposits in Western Europe, with special emphasis on France

Bertrán

Liard

Sitzia

et al. 2016

J Quaternary Science

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International audiencehe Land Use and Cover Area frame Statistical survey (LUCAS) database on topsoil properties inEurope was used to map aeolian deposits. The points which satisfy the grain-size criteria of coversands, loess andtransitional facies were extracted from the rasters of predicted soil texture established by kriging of the LUCAS databy Ballabio et al. (2016). A comparison with already available maps, derived from a conventional ﬁeld approach,shows a good ﬁt in most of the tested areas. The new map, however, suggests a greater extension of loess, whichseems related to the inclusion of thin loess covers, usually omitted by conventional mapping, and the presence ofpreviously unmapped areas due to lack of survey or misinterpretation. The main source of aeolian particlescorresponds to glacio-ﬂuvial sediments at the margin of the Scandinavian and Alpine ice sheets. Coversands andloess form a broad band across northern Europe, and in the Rh^one, Rhine and Danube valleys. Large areas on theoutskirts of these deposits also received a signiﬁcant loess contribution, which has been reworked in slope deposits.Conversely, southern Europe is characterized by much less loess accumulation. The Atlantic coast has transgressivedune ﬁelds that penetrate inland to varying degre

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Section: Results and Validation Testsmentioning

confidence: 97%

Section: Results and Validation Testsmentioning

confidence: 99%

A map of Pleistocene aeolian deposits in Western Europe, with special emphasis on France

Bertrán

Liard

Sitzia

et al. 2016

J Quaternary Science

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“…Alternatively, the difference could correspond to a palaeoclimatic limit similar to that described in northern France (Lautridou, 1985), calcareous loess reflecting drier continental facies. In line with such a hypothesis, note that peri‐mediterranean loess is always carbonate‐rich (Bonifay, 1962; Alimen et al ., 1965).…”

Section: Resultsmentioning

confidence: 99%

Inland aeolian deposits of south‐west France: facies, stratigraphy and chronology

Bertrán

Bateman

Hernandez

et al. 2011

J Quaternary Science

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Archaeological investigations undertaken along a proposed highway together with the compilation of available geological and pedological data made it possible to give a first overview of the distribution of Pleistocene aeolian deposits in southwest France. A chronological framework for deposition has been obtained using both radiocarbon (n ¼ 24) and luminescence (n ¼ 26) dating. It shows that aeolian transport was very active during the Late Pleniglacial, between 15 and $23 ka, leading to sand emplacement over a 13 000-m 2 area at the centre of the basin. The Pleniglacial coversands are typified by extensive fields of small transverse to barchanoid ridges giving way to sandsheets to the east. Subsequent aeolian phases, at ca. 12 ka (Younger Dryas) and 0.8-0.2 ka (Little Ice Age), correspond to the formation of more localized and higher, mainly parabolic dunes. At the southern and eastern margins of the coversand area, aeolian dust accumulated to form loess deposits, the thickness of which reaches $3 m on the plateaus. Luminescence dates together with interglacial-ranking palaeoluvisols between the loess units clearly indicate that these accumulations built up during the last two glacial-interglacial cycles. The chronology of sand and loess deposition thus appears to be consistent with that already documented for northern Europe. This suggests that it was driven by global climate changes in the northern hemisphere. The relatively thin aeolian deposits (and particularly loess) in south-west France is thought to reflect both a supply-limited system and a moister climate than in more northern and continental regions.

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“…He noted a significant change in colour and texture downstream from Valence where the loess becomes coarser and reddish. In the following decades, many studies revealed thick loess deposits (Tricart, 1952;Mazenot, 1956Mazenot, , 1957Mazenot, , 1965Bourdier, 1961;Bonifay, 1962Bonifay, , 1965Alimen, 1965;Dubar, 1972Dubar, , 1979Dubar, , 1983 as well as sand dunes, ventifacts, and (niveo-)aeolian pans (Gabert, 1965;Gabert-Delay, 1967;Ambert, 1973Ambert, , 1974Ambert, , 2013Chardon, 1975;Clauzon et al, 1990;Ambert and Clauzon, 1992). Polygonal wedge networks caused by ground thermal contraction and filled with windblown sand (sand wedges) were also described (Bouteyre and Allemann, 1964;Gabert-Delay, 1967;Cailleux and Rousset, 1968;Nury and Roux, 1969;Arnal, 1971aArnal, , 1971b.…”

Section: Regional Setting 21 Geological and Geomorphological Settingmentioning

confidence: 99%

“…Many authors (Alimen, 1965;Dubar, 1979;Coudé-Gaussen, 1990) have pointed out that perimediterranean loess displays distinctive sedimentological characteristics when compared to loess from the NELB, mainly a coarser texture and higher carbonate content. The aeolian deposits of the Rhône Valley also show that the spatial distribution and facies differ significantly.…”

Section: Loess Depositional Contextmentioning

confidence: 99%

Last Glacial aeolian landforms and deposits in the Rhône Valley (SE France): Spatial distribution and grain-size characterization

et al. 2018

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In the Rhône Valley, a north-south oriented Cenozoic rift in southeast France, thick Pleistocene loess deposits have been recognized since the beginning of the last century. These loess records, which are disconnected from the North European Loess Belt (NELB), are of significant interest to document the evolution of perimediterranean landscapes and environments during the Last Glacial. To overcome the poor precision of available aeolian distribution maps, aeolian deposits were mapped using the topsoil textural database provided by the Land Use and Cover Area frame Statistical Survey project (LUCAS). The grain-size distribution of aeolian sand and loess was first determined using 116 samples taken from surveyed outcrops. Then, the areas showing a similar grain-size composition were extracted from the LUCAS rasters. The resulting map reproduces the conventional maps correctly but suggests a more significant extension of loess, in better agreement with the known distribution of outcrops. The map shows that the distinctive morphology of the valley dominantly controls the distribution of aeolian deposits. The deflation-related landforms, i.e., yardangs, closed depressions (pans), and desert pavements, are widespread south of narrowings of the Rhône Valley between latitudes 44°N and 45°N. They indicate palaeowinds blowing from the north/northwest. Aeolian sand, loessic sand, sandy loess, and loess deposits successively spread on both sides of the Rhône River. The loess is characterized by a coarse texture (main mode around 60 μm), strong local thickness (N5 m), limited extension, and abundant bioturbation. This preservation results from the persistence of a shrub vegetal cover during the coldest and driest phases of the Last Glacial that allowed for trapping the saltating and suspended particles close to the alluvial sources.

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Pétrographie des limons de Provence

Cited by 5 publications

References 0 publications

A map of Pleistocene aeolian deposits in Western Europe, with special emphasis on France

A map of Pleistocene aeolian deposits in Western Europe, with special emphasis on France

Inland aeolian deposits of south‐west France: facies, stratigraphy and chronology

Last Glacial aeolian landforms and deposits in the Rhône Valley (SE France): Spatial distribution and grain-size characterization

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