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Climatic influence of the latest Antarctic isotope maximum of the last glacial period (AIM4) on Southern Patagonia ArchiMer
Jouve, Guillaume; Lise-pronovost, Agathe; Francus, Pierre; De Coninck, Arnaud S.; Pasado Science Team,.
This paper presents the first detailed paleoclimate reconstruction of the latest Antarctic isotope maximum (AIM4, similar to 33-29 ka cal. BP) at 52 degrees S in continental southeastern Argentine Patagonia. High-resolution sedimentological and geochemical analyses of sediments from the maar lake Potrok Aike (PTA) reveal a decrease in the thickness of flood-induced turbidites and a series of wind burst deposits during AIM4, both pointing to increasingly drier conditions. This interpretation is also supported by a significant amount of runoff-driven micropumices incorporated within the sediments that suggests a lower lake level with canyons incising thick tephra deposits around the lake. Increased gustiness and/or dust availability in southeast Patagonia,...
Tipo: Text Palavras-chave: Southern Westerly Winds; Micro X-ray fluorescence; Microfacies; Micropumices; Dust; Flood.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00420/53164/83103.pdf
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