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THE THREE LAST MILLENIA HISTORY OF THE HOLOCENE HYDRO-SEDIMENTARY FLOWS IN THE UPSTREAM LOIRE RIVER BASIN (MASSIF CENTRAL, FRANCE): CONTRIBUTION OF A CUMULATIVE PROBABILITY DENSITY FUNCTION (CPDF) ANALYSIS AND REGIONAL CORRELATIONS

Abstract : A paleoenvironnemental and geoarchelogical pluridisciplinary and multi-proxy research was carried out on the upstream Loire basin to study the hydro-sedimentary flows wich have affected headwaters of the hydrosystem during the Holocene. A set of 107 radicarbon dates support the results. A statistical analysis (Cumulative Probability Density Function) defined the different evolution stages during the last three millenia. The results are similar to those obtained in the the Rhône Valley. Four major erosional crisis occurred circa the beginning of second Iron Age (around 400 BC), the end of Iron Age and the beginning of the Roman period (100 BC-100 AD), in the Late Antiquity and at the beginning of the Upper Middle Age (350-550 AD) and finally between the xivth and the end of the xixth century. The classic subdivision of the LIA in three phases is here enriched by a new period of hydrosystems stability during the xviiith century. Between these major crises, the Early Middle Age appears as an unstable environmental period, while a long period of stability occurred between the end of the ixth century and the beginning of the xiiith century, during the medieval little climatic optimum.
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Emmanuelle Defive, Jean‑françois Berger, Alexandre Poiraud, Adrien Barra, Emma Bouvard, et al.. THE THREE LAST MILLENIA HISTORY OF THE HOLOCENE HYDRO-SEDIMENTARY FLOWS IN THE UPSTREAM LOIRE RIVER BASIN (MASSIF CENTRAL, FRANCE): CONTRIBUTION OF A CUMULATIVE PROBABILITY DENSITY FUNCTION (CPDF) ANALYSIS AND REGIONAL CORRELATIONS. Quaternaire, Centre National de la Recherche Scientifique, 2017, 28 (3), pp.373-388. ⟨10.4000/quaternaire.8304⟩. ⟨hal-01670720⟩

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