Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany)
Weichselian cryogenic calcites collected in what is referred to as the Rätselhalle of the Herbstlabyrinth-Advent Cave system are structurally classified as rhombohedral crystals and spherulitic aggregates. The carbon and oxygen isotopic composition of these precipitates (δ13C = +0.6 to −7.3‰ δ18O =...
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Online Access: | https://doi.org/10.5194/tc-4-501-2010 http://www.the-cryosphere.net/4/501/2010/tc-4-501-2010.pdf https://doaj.org/article/35096738bc0b49ef87287eaf7023b954 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:35096738bc0b49ef87287eaf7023b954 2023-05-15T16:37:00+02:00 Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) D. K. Richter P. Meissner A. Immenhauser U. Schulte I. Dorsten 2010-11-01 https://doi.org/10.5194/tc-4-501-2010 http://www.the-cryosphere.net/4/501/2010/tc-4-501-2010.pdf https://doaj.org/article/35096738bc0b49ef87287eaf7023b954 en eng Copernicus Publications doi:10.5194/tc-4-501-2010 1994-0416 1994-0424 http://www.the-cryosphere.net/4/501/2010/tc-4-501-2010.pdf https://doaj.org/article/35096738bc0b49ef87287eaf7023b954 undefined The Cryosphere, Vol 4, Iss 4, Pp 501-509 (2010) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2010 fttriple https://doi.org/10.5194/tc-4-501-2010 2023-01-22T19:16:45Z Weichselian cryogenic calcites collected in what is referred to as the Rätselhalle of the Herbstlabyrinth-Advent Cave system are structurally classified as rhombohedral crystals and spherulitic aggregates. The carbon and oxygen isotopic composition of these precipitates (δ13C = +0.6 to −7.3‰ δ18O = −6.9 to −18.0‰) corresponds to those of known slowly precipitated cryogenic cave calcites under conditions of isotopic equilibrium between water and ice of Central European caves. The carbon and oxygen isotopic composition varies between different caves which is attributed to the effects of cave air ventilation before the freezing started. By petrographic and geochemical comparisons of Weichselian cryogenic calcite with recent to sub-recent precipitates as well as Weichselian non-cryogenic calcites of the same locality, a model for the precipitation of these calcites is proposed. While the recent and sub-recent pool-calcites isotopically match the composition of interglacial speleothems (stalagmites, etc.), isotope ratios of Weichselian non-cryogenic pool-calcites reflect cooler conditions. Weichselian cryogenic calcites show a trend towards low δ18O values with higher carbon isotope ratios reflecting slow freezing of the precipitating solution. In essence, the isotope geochemistry of the Weichselian calcites reflects the climate history changing from overall initial permafrost conditions to permafrost-free and subsequently to renewed permafrost conditions. Judging from the data compiled here, the last permafrost stage in the Rätselhalle is followed by a warm period (interstadial and/or Holocene). During this warmer period, the cave ice melted and cryogenic and non-cryogenic Weichselian calcite precipitates were deposited on the cave ground or on fallen blocks, respectively. Article in Journal/Newspaper Ice permafrost The Cryosphere Unknown The Cryosphere 4 4 501 509 |
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geo envir D. K. Richter P. Meissner A. Immenhauser U. Schulte I. Dorsten Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
topic_facet |
geo envir |
description |
Weichselian cryogenic calcites collected in what is referred to as the Rätselhalle of the Herbstlabyrinth-Advent Cave system are structurally classified as rhombohedral crystals and spherulitic aggregates. The carbon and oxygen isotopic composition of these precipitates (δ13C = +0.6 to −7.3‰ δ18O = −6.9 to −18.0‰) corresponds to those of known slowly precipitated cryogenic cave calcites under conditions of isotopic equilibrium between water and ice of Central European caves. The carbon and oxygen isotopic composition varies between different caves which is attributed to the effects of cave air ventilation before the freezing started. By petrographic and geochemical comparisons of Weichselian cryogenic calcite with recent to sub-recent precipitates as well as Weichselian non-cryogenic calcites of the same locality, a model for the precipitation of these calcites is proposed. While the recent and sub-recent pool-calcites isotopically match the composition of interglacial speleothems (stalagmites, etc.), isotope ratios of Weichselian non-cryogenic pool-calcites reflect cooler conditions. Weichselian cryogenic calcites show a trend towards low δ18O values with higher carbon isotope ratios reflecting slow freezing of the precipitating solution. In essence, the isotope geochemistry of the Weichselian calcites reflects the climate history changing from overall initial permafrost conditions to permafrost-free and subsequently to renewed permafrost conditions. Judging from the data compiled here, the last permafrost stage in the Rätselhalle is followed by a warm period (interstadial and/or Holocene). During this warmer period, the cave ice melted and cryogenic and non-cryogenic Weichselian calcite precipitates were deposited on the cave ground or on fallen blocks, respectively. |
format |
Article in Journal/Newspaper |
author |
D. K. Richter P. Meissner A. Immenhauser U. Schulte I. Dorsten |
author_facet |
D. K. Richter P. Meissner A. Immenhauser U. Schulte I. Dorsten |
author_sort |
D. K. Richter |
title |
Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
title_short |
Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
title_full |
Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
title_fullStr |
Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
title_full_unstemmed |
Cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the Herbstlabyrinth-Advent Cave system (Germany) |
title_sort |
cryogenic and non-cryogenic pool calcites indicating permafrost and non-permafrost periods: a case study from the herbstlabyrinth-advent cave system (germany) |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/tc-4-501-2010 http://www.the-cryosphere.net/4/501/2010/tc-4-501-2010.pdf https://doaj.org/article/35096738bc0b49ef87287eaf7023b954 |
genre |
Ice permafrost The Cryosphere |
genre_facet |
Ice permafrost The Cryosphere |
op_source |
The Cryosphere, Vol 4, Iss 4, Pp 501-509 (2010) |
op_relation |
doi:10.5194/tc-4-501-2010 1994-0416 1994-0424 http://www.the-cryosphere.net/4/501/2010/tc-4-501-2010.pdf https://doaj.org/article/35096738bc0b49ef87287eaf7023b954 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-4-501-2010 |
container_title |
The Cryosphere |
container_volume |
4 |
container_issue |
4 |
container_start_page |
501 |
op_container_end_page |
509 |
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1766027312326770688 |