ABSTRACT During the last glacial maximum (LGM), large parts of the European Alps were occupied by an extensive interconnected system of valley glaciers. At lower elevations on the eastern fringe of the Alps, only a patchy pattern of isolated glaciers developed. Erosion by many of these smaller glaciers was however sufficient to excavate subglacial basins (‘overdeepening’) large enough to act as sedimentary archives of deglaciation processes. To constrain the deglaciation history and the post-LGM evolution of an isolated glacial system, we analyzed the geomorphology and the sedimentary record of a local overdeepening at the northern fringe of the Northern Calcareous Alps. We focus on the heavily silted lake system Taferlklaussee (TKS) (Höllengebirge massif, Austria) confined by a succession of terminal moraines and a steep headwall. Field techniques (mapping, Direct Current Resistivity, and core drilling), lab techniques (lithostratigraphic analyses and radiocarbon dating) and Geographic Information System (GIS) analyses are employed to document dynamics of erosion and sedimentation after deglaciation. We discuss drivers and controls of paraglacial landscape evolution. The almost complete postglacial (lake) record indicates abundant sediment input during the lateglacial and early Holocene, but strongly reduced dynamics since the Mid-Holocene. Sediment storage volumes range between 3.83 Mm³ and 5.75 Mm³ and lithology-specific mechanical denudation rates range between 0.8 mm/a and 1.7 mm/a depending on the scenario used. The study provides a well-constrained reference for the depositional dynamics of isolated LGM glacier systems of the Eastern Alps. It highlights the potential of using related sedimentary records to constrain the local variability in postglacial landscape evolution.

中文翻译：

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从冰川消融到冰川后充填：东阿尔卑斯山北部边缘孤立冰川系统的 LGM 后演化（奥地利）

摘要 在末次盛冰期 (LGM) 期间，欧洲阿尔卑斯山的大部分地区被广泛相互连接的山谷冰川系统所占据。在阿尔卑斯山东部边缘的低海拔地区，仅形成了零星的孤立冰川。然而，许多这些较小冰川的侵蚀足以挖掘出足够大的冰下盆地（“过度加深”），以充当冰消过程的沉积档案。为了限制冰川消融历史和孤立冰川系统的 LGM 后演化，我们分析了北钙质阿尔卑斯山北部边缘局部过度加深的地貌和沉积记录。我们专注于由一连串末端冰碛和陡峭的端墙限制的严重淤积的湖泊系统 Taferlklaussee (TKS)（Höllengebirge 地块，奥地利）。现场技术（测绘、直流电阻率和岩心钻探）、实验室技术（岩石地层分析和放射性碳测年）和地理信息系统 (GIS) 分析用于记录冰川消融后侵蚀和沉积的动态。我们讨论了冰川旁景观演变的驱动因素和控制因素。几乎完整的冰后（湖泊）记录表明，在晚冰期和全新世早期有丰富的沉积物输入，但自全新世中期以来，动力急剧下降。沉积物储存量介于 3.83 立方米和 5.75 立方米之间，特定岩性的机械剥蚀率介于 0.8 毫米/年和 1.7 毫米/年之间，具体取决于所使用的场景。该研究为东阿尔卑斯山孤立的LGM冰川系统的沉积动力学提供了良好的参考。