Suoli e suoli sepolti olocenici per la datazione di eventi geomorfologici in ambiente alpino: alcuni esempi tratti da indagini preliminari in Val d'Aosta
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Abstract
During two short field studies carried out by the section "Glaciology" of the Italian Group for Physical Geography and Geomorphology of C.N.R. soils and buried soils were sampled in order to obtain 14C dates related to geomorphic events. The problems and implications of 14C dating of soils and buried soils are briefly reviewed. Three cases of radiocarbon dating of Holocene glacial advances, rock glacier activity and rock avalanche deposition in the Aosta Valley (Western Italian Alps) are described. The potential applications of radiocarbon dating of geomorphic events using soils and buried soils are discussed. Pre-Little Ice Age moraines have been identified and dated in Val d'Ayas. A soil developed on a Late-Glacial moraine and buried by a rock glacier in Val di Rhemes has been dated 3965 ± 140 B.P. A rockfall deposit covering pre-Little Ice Age glacio-fluvial gravel has been dated 1025 ± 170 B.P.Aosta valley
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