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The sedimentological death mask of a dying glacier
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Journal Article
The sedimentological death mask of a dying glacier
2022
Overview
The Pasterze is Austria's largest glacier, and it is experiencing rapid downwasting and retreat. A mosaic of complex sedimentary deposits has been produced in recent years which have not hitherto been studied, yet provide excellent lessons into the facies distribution expected from a dying valley glacier. In this paper, a new glaciological–geomorphological–geological map is presented for the glacier in July 2021. Freshly exposed (since 2018) tills and flutes constitute a subglacial sediment–landform assemblage. An ice‐marginal sediment–landform assemblage comprises meltwater streams, a delta system and proglacial lake terrace deposits. The supraglacial assemblage, meanwhile, includes fossil englacial channel deposits revealed by ablation, together with debris bands, rockfall deposits and supraglacial channel deposits. Collectively, these sediment–landform assemblages constitute the building blocks of a dying glacier landsystem. The rapid retreat of Alpine valley glaciers is a well known phenomenon, and the distribution of sedimentary facies in front of them is highly complex. Here, we characterise the sediment‐landform assemblage at the margin of the Pasterze Glacier, Austria, revealing newly discovered flutes near the ice margin, and consider a highly complex delta system partly deposited on top of dead ice.
