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| Titel |
Coarsely crystalline cryogenic cave carbonate – a new archive to estimate the Last Glacial minimum permafrost depth in Central Europe |
| VerfasserIn |
K. Zak, D. K. Richter, M. Filippi, R. Živor, M. Deininger, A. Mangini, D. Scholz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 6 ; Nr. 8, no. 6 (2012-11-14), S.1821-1837 |
| Datensatznummer |
250005971
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| Publikation (Nr.) |
 copernicus.org/cp-8-1821-2012.pdf |
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| Zusammenfassung |
| Cryogenic cave carbonate (CCC) represents a specific type of speleothem
whose precipitation is triggered by freezing of mineralized karst water.
Coarsely crystalline CCC, which formed during slow freezing of water in cave
pools, has been reported from 20 Central European caves located in Germany,
the Czech Republic, Slovakia and Poland. All these caves are situated in an
area which was glacier-free during the Weichselian. Whereas the formation of
usual types of speleothems in caves of this region usually ceased during the
glacials, coarsely crystalline CCC precipitation was restricted to glacial
periods. Since this carbonate type represents a novel, useful paleoclimate
proxy, data from its Weichselian occurrences in caves in Central Europe were
collected, including their C and O stable isotope values, U-series ages
and depth below the surface. When using only the CCC data from caves with
limited cave ventilation, the permafrost depths of the Weichselian can be
estimated to be at least 65 m in the lowlands and uplands. An isolated CCC
find indicates that Weichselian permafrost penetrated to a depth of at least
285 m in the High Tatra mountains, Slovakia. A model of the formation of
coarsely crystalline CCC assumes its formation especially during periods of
permafrost thawing. U-series data confirm that permafrost depth changed and
CCC precipitation in deep caves occurred repeatedly in the studied area
during marine isotope stages 4, 3 and 2. One important phase of coarsely
crystalline CCC formation related to permafrost thawing occurred between 40
and 21 ka BP, and the last phase of its formation was related to the final
permafrost destruction between 17 and 12 ka BP. |
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