The palaeo-glaciers and palaeo-lakes from the Bolivian Altiplano as climatic archives for the last deglaciation

Abstract : The transition between the last glacial maximum and the actual interstadial (from 20 to 12 ka before present) is characterized by short and abrupt climate reorganizations at different scales. Over the Bolivian Altiplano, giant palaeo-lakes wax and wane within 2000 years. The glaciers dynamics is controlled by the climate, making the deposits from the former glaciers one of the few climatic archives available on this arid plateau. The exposure age method enables to reconstruct the history of former glaciers. This thesis brings new tools for the calculation of these ages. It also presents new ages coupled with palaeo-climate reconstructions. These results indicates that the palaeo-lake formations are concomitant with mean coolings of 2.5 to 4.2°C compared to present and with an enhanced moist transport from the East, crossing the Bolivian Oriental Cordillera
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Léo Martin. The palaeo-glaciers and palaeo-lakes from the Bolivian Altiplano as climatic archives for the last deglaciation. Earth Sciences. Université de Lorraine, 2016. English. ⟨NNT : 2016LORR0058⟩. ⟨tel-01752256⟩

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