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The timing of glacier advances in the northern European Alps based on surface exposure dating with cosmogenic (super 10) Be, (super 26) Al, (super 36) Cl, and (super 21) Ne

Susan Ivy-Ochs, Hanns Kerschner, Anne Reuther, Max Maisch, Rudolf Sailer, Joerg Schaefer, Peter W. Kubik, Hans-Arno Synal and Christian Schluechter
The timing of glacier advances in the northern European Alps based on surface exposure dating with cosmogenic (super 10) Be, (super 26) Al, (super 36) Cl, and (super 21) Ne (in In situ-produced cosmogenic nuclides and quantification of geological processes, Lionel L. Siame (editor), Didier L. Bourles (editor) and Erik T. Brown (editor))
Special Paper - Geological Society of America (2006) 415: 43-60

Abstract

Exposure dating of boulder and bedrock surfaces with (super 10) Be, (super 21) Ne, (super 26) Al, and (super 36) Cl allows us to constrain periods of glacier expansion in the European Alps. The age of 155 ka from a boulder of Alpine lithology located in the Jura Mountains (Switzerland) provides a minimum age for pre-LGM (Last Glacial Maximum), more extensive Alpine glaciations. During the LGM, glaciers expanded onto the foreland after 30 ka. By 21.1+ or -0.9 ka deglaciation had begun, and the Rhone Glacier abandoned the outer moraines. The age of 15.4+ or -1.4 ka provides a minimum age for formation of Gschnitz stadial moraines (Austria). They mark the first clear post-LGM readvance of mountain glaciers, when glacier termini were already situated well inside the mountains. Glacier advance at the onset of the Younger Dryas led to formation of Egesen I moraines, dated to 12.2+ or -1.0 ka at the Schonferwall site (Austria) and to 12.3+ or -1.4 ka at the outer moraine at Julier Pass (Switzerland). The age of 11.3+ or -0.9 ka for the inner moraine/rock glacier complex at Julier Pass corroborates the field evidence, which points to a marked increase in rock glacier activity and delayed moraine stabilization during the late Younger Dryas. An early Preboreal glacier advance, larger than the Little Ice Age advance(s) at 10.8+ or -1.0 ka, was recorded at Kartell cirque (Austria). A moraine doublet located a few hundred meters outside the A.D. 1950 moraines in Kromer Valley (Austria) was dated at 8.4+ or -0.7 ka. At least during termination 1, glacier volumes in the Alps varied in tune with climate oscillations, Heinrich event 1, the Younger Dryas cold phase, the Preboreal oscillation, and the 8.2 ka event.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 415
Title: The timing of glacier advances in the northern European Alps based on surface exposure dating with cosmogenic (super 10) Be, (super 26) Al, (super 36) Cl, and (super 21) Ne
Title: In situ-produced cosmogenic nuclides and quantification of geological processes
Author(s): Ivy-Ochs, SusanKerschner, HannsReuther, AnneMaisch, MaxSailer, RudolfSchaefer, JoergKubik, Peter W.Synal, Hans-ArnoSchluechter, Christian
Author(s): Siame, Lionel L.editor
Author(s): Bourles, Didier L.editor
Author(s): Brown, Erik T.editor
Affiliation: ETH-Hoenggerberg, Institut fuer Teilchenphysik, Zurich, Switzerland
Affiliation: Universite Paul Cezanne, Aix-en-Provence, France
Pages: 43-60
Published: 2006
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 125
Accession Number: 2007-038894
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
N45°04'00" - N48°17'60", E06°09'00" - E15°25'60"
Secondary Affiliation: University of Minnesota, USA, United StatesUniversitaet Innsbruck, AUT, AustriaUniversitaet Regensburg, DEU, Federal Republic of GermanyUniversitaet Zurich-Irchel, CHE, SwitzerlandInstitut fuer Naturgefahren und Waldgrenzregionen, AUT, AustriaLamont Doherty Earth Institute, USA, United StatesUniversitaet Bern, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200721
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