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| Titel |
Dynamics of a Younger-Dryas glacier system framed by Bølling-Allerød and Preboreal landslides |
| VerfasserIn |
Martin Reindl, Mathias G. Bichler, Hermann Häusler, Jürgen M. Reitner |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073675
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| Schlagwörter |
Glaziologie, Gletscher, Rekonstruktion, Egesen-Stadium, Spätglazial, Kosmogene Nuklide, Altersbestimmung, C-14-Methode, Massenbewegung, Erdrutsch, Quartär |
| Geograf. Schlagwort |
Österreich, Salzburg, Zell am See (Bezirk), Hüttwinkltal, Goldberggruppe, Hohe Tauern |
| Blattnummer |
154 [Rauris] |
| Blattnummer (UTM) |
3227 [Großglockner] |
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| Zusammenfassung |
| The head of the Hüttwinkl valley in the Austrian province of Salzburg, north of the
Hoher Sonnblick (3106m asl) in the Hohe Tauern alpine range provides an excellent
opportunity to reconstruct a Younger-Dryas (Egesen stadial) glacier system and its
relation to prominent landslides from the onset of the ice advance to the retreat
phase.
The landslide events (13ka BP and 10ka BP) as well as the glacial advance
(12.5ka BP) and retreat (11ka BP) were dated using terrestrial in-situ cosmogenic
nuclides (TCN), 10Be in this case, and, partly, organic 14C from peat. To produce a
extensive chronology, seven TCN samples from the landslides, and eleven TCN boulder
samples and two TCN polished bedrock samples related to glacier history were
processed.
Detailed sedimentary evidence allows us to constrain the starting position of glaciers
before the Younger Dryas advance, as well reconstructing a confluence situation of the two
local glaciers (Goldbergkees and Pilatuskees), producing a glacier system with a maximum
surface area of 10 km2, as well as shedding some light on the glacial dynamics during the
retreat phases of the Egesen. In addition, surface models revealed in one case a reconstituted
glacier geometry.
We employed various methods for calculating Equilibrium-Line-Altitudes (Maximum
Elevation of Lateral Moraines, Toe-to-Headwall-Altitude Ratio, Area x Altitude, Area x
Altitude Balance Ratio, and Accumulation Area Ratio) and compared them to already
available data from western Austria and Switzerland. With this data, we are able to
reconstruct temperature and precipitation change of the local climate and glacier dynamics
during the maximum of the Younger-Dryas in the central part of the European Eastern Alps. |
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