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Chronologie de la déglaciation des Pyrénées françaises. Dynamique de sédimentation et contenu pollinique des paléolacs ; application à l'interprétation du retrait glaciaire

Abstract : On the basis of available modern data, it can be assumed that the beginning of the glacial retreat in the northern Pyrenees was prior to 38,4 KY. The presence of external and internal moraines in the glaciated valleys is the consequence of an irregular glacial retreat interrupte The presence of external and internal moraines in the glaciated valleys is the consequence of an irregular glacial retreat interrupted by readvanced and stagnation stages. The oldest retreat phase occurred before 38,4 KY on the external margin of the glacial piedmont of Lourdes. In the terminal glacial basin of the Garonne, before 26 KY, a glacial recurrence (datings in process) probably contemporaneous with the building of the internal moraines is registred. Due to the lack of iterative data from other sites, we cannot say if it corresponded to a local or a more general phenomenon. From 26-24 KY, the déglaciation was more important in the terminal glacial basins of Garonne and Ossau while in the same time the dryness increased. This climatic feature concerned the northern slope of the Pyrenees as well as the molassic piedmont, especially to the south of Toulouse where a loess deposition phase occurred which probably began before 23 Ky. Until 16-15 KY, the glaciers retreated progressively. At middle altitude, from 16-15 KY onwards, the lacustrine or glacio fluvial deposits indicate that the mountain was widely deglaciated, the residual glaciers being only in favourable locations. In the northern slope of the Pyrenees, the déglaciation of the higher parts was virtually terminated during the dry period registred in Europe near 15 KY
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Valérie Andrieu-Ponel, Jacques Hubschman, Guy Jalut, Gerard Herail. Chronologie de la déglaciation des Pyrénées françaises. Dynamique de sédimentation et contenu pollinique des paléolacs ; application à l'interprétation du retrait glaciaire. Bulletin de l'Association française pour l'étude du quaternaire, Association française pour l'étude du quaternaire, 1988, 25 (2-3), pp.55-67. ⟨10.3406/quate.1988.1866⟩. ⟨hal-02735751⟩

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