Do ice-dam rupture events leave a distinctive signature in proglacial lake sediments?

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中文题名冰坝溃决事件是否会在前冰期湖泊沉积物中留下独特的特征?
作者Guido Brignone*1;Matias Romero2;Maximillian Van Wyk de Vries3;Emi Ito4;Mark Shapley5;Eduardo Luis Piovano6
作者单位1Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN), Universidad Nacional de Córdoba, Córdoba, X5016GCA, Argentina;2Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN), Universidad Nacional de Córdoba, Córdoba, X5016GCA, Argentina Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Córdoba, X5016GCA, Argentina Department of Geoscience, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA;3Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, Minnesota 55455, USA School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, UK;4Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA Continental Scientific Drilling Facility, Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA.;5Continental Scientific Drilling Facility, Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, Minnesota 55455, USA.;6Facultad de Ciencias Exactas, Físicas y Naturales (FCEFyN), Universidad Nacional de Córdoba, Córdoba, X5016GCA, Argentina Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Córdoba, X5016GCA, Argentina
刊名Quaternary Research
年2025
卷123
摘要
Lake sediment provides a valuable record of past environmental change. However, the controls on sedimentation in proglacial lakes and their relation to glacier retreat remain poorly understood. In this study we analyze glaciolacustrine sediment production and deposition in Canal de los Témpanos, Lago Argentino, Argentine Patagonia. We associate temporal changes in the sedimentologic and geochemical characteristics analyzed from Lago Argentino cores with Late Holocene fluctuations of the Perito Moreno and Ameghino glaciers. We show that the dominant sediment source at our study site switched from Ameghino to Perito Moreno Glacier after the recession of Ameghino Glacier and the formation of the marginal ice-contact lake into which it currently calves. Spectacular ice-dam rupture events generated by Perito Moreno Glacier redistribute large volumes of water through the lake system but do not leave a significant sedimentary signature. Our results demonstrate that a detailed analysis of sedimentologic, petrophysical, and geochemical changes in lake cores can provide insight into regional glacial dynamics and sedimentary processes even in complex systems with multiple competing glacial sources and that changing glacier geometries during retreat can provide insights into the provenience of the sediments.

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