Unravelling the timing of the onset of the last deglaciation of the southern Black Forest, SW Germany

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Abstract: Previous reconstructions conclude that the southern Black Forest temporarily hosted four, presumably interconnected ice caps during the Late Pleistocene. While the chronology of the last deglaciation of this region has been the focus of several studies, the timing of its onset remains largely unknown. To fill this gap, this study examines glacial landforms on a high plateau ESE of the highest summit of the Black Forest, Feldberg (1493 m above sea-level), which are situated at the last glaciation maximum position of two diffluent outlet glaciers, the Schluchsee and Haslach glaciers. The mapping of glacial landforms involved both the interpretation of high-resolution digital elevation models and their derivates, and extensive field surveys. The application of Be-10 cosmic-ray exposure (CRE) dating to moraines and erratic boulders allowed for determining the onset of glacier recession from the last glaciation maximum position. Geomorphological mapping reveals that ground moraine with numerous erratic boulders extends beyond the confirmed and newly identified moraines. Our preferred interpretation is that the maximum advance of the outlet glaciers was relatively short-lived, preventing the formation of ice-marginal moraines. CRE dating of an erratic boulder beyond the moraines of the Schluchsee glacier resulted in an age of 21.4 ± 0.9 ka. Moraine boulders in stratigraphically younger positions gave a slightly older mean age of 24.3 ± 0.9 ka. Moraine-boulder surfaces near the last glaciation maximum position of the Haslach glacier yielded a mean age of 18.6 ± 0.7 ka. The differing mean ages of the moraines of the Schluchsee and Haslach glaciers might indicate that these glaciers withdrew asynchronously from their maximum positions. Alternatively, post-depositional and/or post-stabilisation exhumation might have affected the sampling surfaces on the moraine of the Haslach glacier. Recalculating existing 10Be CRE ages for key sites in central Europe particularly showed that the Schluchsee glacier might have withdrawn from its last maximum position simultaneously with glaciers in the Vosges, on the Swiss Plateau, and in the Bavarian Forest. Future work will have to confirm this possible synchronicity and, if applicable, unveil the underlying mechanisms

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Notes: 50th Annual meeting of the German Society for Geomorphology, Leipzig, 9.10. - 12.10.2024

Classification: Wirtschaft

Keyword: Moräne
Gletscher
Gletscherrückzug
Kosmogenes Radionuklid
Geomorphologische Kartierung
Glazialgeologie
Glazialmorphologie
Paläoklima

Event: Veröffentlichung

(where): Freiburg

(who): Universität

(when): 2024

Creator: Hofmann, Felix Martin
Preusser, Frank

Contributor: Albert-Ludwigs-Universität Freiburg. Professur für Sedimentologie

DOI: 10.6094/UNIFR/257248

URN: urn:nbn:de:bsz:25-freidok-2572487

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:28 AM CEST

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2024

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Unravelling the timing of the onset of the last deglaciation of the southern Black Forest, SW Germany

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Other Objects (12)

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