14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin
Speleothems in 6 sandstone caves in the Bohemian Paradise (Český ráj) were dated by means of 14C and U-series methods. Stable isotopes of C and O, FAAS, IR, XRD, XRF and SEM were used to characterize the carbonate material and its source. Stable isotopes (C and O) composition of speleothems in two c...
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ftczechacademysc:oai:kramerius.lib.cas.cz:uuid:f2454f9a-58f9-4300-9d34-af1e280ed7b6 2024-03-17T08:59:51+00:00 14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin Bruthans, Jiří Schweigstillová, Jana Jenč, Petr , 1976- Churáčková, Zdeňka Bezdička, Petr print média svazek https://kramerius.lib.cas.cz/view/uuid:f2454f9a-58f9-4300-9d34-af1e280ed7b6 unknown https://kramerius.lib.cas.cz/view/uuid:f2454f9a-58f9-4300-9d34-af1e280ed7b6 issn:1214-9705 policy:public Geologie. Meteorologie. Klimatologie pískovce jeskyně stáří pseudokras eroze (geologie) holocén sandstones caves old age pseudokarst erosion holocene speleothems 7 551 article články model:article ftczechacademysc 2024-02-19T22:47:53Z Speleothems in 6 sandstone caves in the Bohemian Paradise (Český ráj) were dated by means of 14C and U-series methods. Stable isotopes of C and O, FAAS, IR, XRD, XRF and SEM were used to characterize the carbonate material and its source. Stable isotopes (C and O) composition of speleothems in two caves corresponds to values characteristic for cave speleothems in Central Europe. In other caves they indicate evaporation and fast carbon dioxide escape during carbonate precipitation. The speleothems from the Krtola Cave were deposited between 8 and 13 kyr BP. Speleothems were deposited 5-8 kyr BP in the Sintrová, Mrtvé Údolí and U Studánky caves. Calcite coatings on smooth sandstone surfaces in studied caves demonstrate that cave walls did not retreat even a few mm in the last 5-8 kyr since speleothem deposition and are thus not evolving under recent climatic conditions. Most of the cave ceilings and walls are at present time indurated by hardened surfaces, which protect the sandstone from erosion. Sandstone caves probably intensively evolved either during or at the end of the Last Glacial period. There are two different erosion mechanisms which might have formed/reshaped the caves at that time: A) In the case of permafrost conditions: Repeated freeze/melt cycles affecting sandstone pore space followed by the transport of fallen sand grains by minor temporary trickles. We expect that heat was transmitted by air circulating between the cave and the surface; B) Seepage erosion of sandstone during the melting of permafrost, prior forming of case hardening. Jiří Bruthans, Jana Schweigstillová, Petr Jenč, Zdeňka Churáčková and Petr Bezdička. Obsahuje bibliografii Article in Journal/Newspaper permafrost Czech Academy of Sciences: dKNAV |
institution |
Open Polar |
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Czech Academy of Sciences: dKNAV |
op_collection_id |
ftczechacademysc |
language |
unknown |
topic |
Geologie. Meteorologie. Klimatologie pískovce jeskyně stáří pseudokras eroze (geologie) holocén sandstones caves old age pseudokarst erosion holocene speleothems 7 551 |
spellingShingle |
Geologie. Meteorologie. Klimatologie pískovce jeskyně stáří pseudokras eroze (geologie) holocén sandstones caves old age pseudokarst erosion holocene speleothems 7 551 Bruthans, Jiří Schweigstillová, Jana Jenč, Petr , 1976- Churáčková, Zdeňka Bezdička, Petr 14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
topic_facet |
Geologie. Meteorologie. Klimatologie pískovce jeskyně stáří pseudokras eroze (geologie) holocén sandstones caves old age pseudokarst erosion holocene speleothems 7 551 |
description |
Speleothems in 6 sandstone caves in the Bohemian Paradise (Český ráj) were dated by means of 14C and U-series methods. Stable isotopes of C and O, FAAS, IR, XRD, XRF and SEM were used to characterize the carbonate material and its source. Stable isotopes (C and O) composition of speleothems in two caves corresponds to values characteristic for cave speleothems in Central Europe. In other caves they indicate evaporation and fast carbon dioxide escape during carbonate precipitation. The speleothems from the Krtola Cave were deposited between 8 and 13 kyr BP. Speleothems were deposited 5-8 kyr BP in the Sintrová, Mrtvé Údolí and U Studánky caves. Calcite coatings on smooth sandstone surfaces in studied caves demonstrate that cave walls did not retreat even a few mm in the last 5-8 kyr since speleothem deposition and are thus not evolving under recent climatic conditions. Most of the cave ceilings and walls are at present time indurated by hardened surfaces, which protect the sandstone from erosion. Sandstone caves probably intensively evolved either during or at the end of the Last Glacial period. There are two different erosion mechanisms which might have formed/reshaped the caves at that time: A) In the case of permafrost conditions: Repeated freeze/melt cycles affecting sandstone pore space followed by the transport of fallen sand grains by minor temporary trickles. We expect that heat was transmitted by air circulating between the cave and the surface; B) Seepage erosion of sandstone during the melting of permafrost, prior forming of case hardening. Jiří Bruthans, Jana Schweigstillová, Petr Jenč, Zdeňka Churáčková and Petr Bezdička. Obsahuje bibliografii |
format |
Article in Journal/Newspaper |
author |
Bruthans, Jiří Schweigstillová, Jana Jenč, Petr , 1976- Churáčková, Zdeňka Bezdička, Petr |
author_facet |
Bruthans, Jiří Schweigstillová, Jana Jenč, Petr , 1976- Churáčková, Zdeňka Bezdička, Petr |
author_sort |
Bruthans, Jiří |
title |
14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
title_short |
14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
title_full |
14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
title_fullStr |
14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
title_full_unstemmed |
14C and U - series dating of speleothems in the Bohemian Paradise (Czech Republic): retreat rates of sandstone cave walls and implications for cave origin |
title_sort |
14c and u - series dating of speleothems in the bohemian paradise (czech republic): retreat rates of sandstone cave walls and implications for cave origin |
url |
https://kramerius.lib.cas.cz/view/uuid:f2454f9a-58f9-4300-9d34-af1e280ed7b6 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
https://kramerius.lib.cas.cz/view/uuid:f2454f9a-58f9-4300-9d34-af1e280ed7b6 issn:1214-9705 |
op_rights |
policy:public |
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1793770747735310336 |