Sand calcites as a key to Pleistocene periglacial landscapes
We tested the potential for sand calcites to serve as a novel paleoclimate archive by investigating their age and formation conditions. Fontainebleau sand calcites are Pleistocene in age (based on ¹⁴C and U-Th dating) and were primarily formed during glacial periods. δ¹³C values increase with the de...
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Online Access: | https://hdl.handle.net/2440/133246 https://doi.org/10.1017/qua.2020.98 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/133246 2023-12-17T10:48:37+01:00 Sand calcites as a key to Pleistocene periglacial landscapes Thiry, M. Innocent, C. Girard, J.-P. Milnes, A.R. Franke, C. Guillon, S. 2020 https://hdl.handle.net/2440/133246 https://doi.org/10.1017/qua.2020.98 en eng Cambridge University Press (CUP) Quaternary Research, 2020; 101:225-244 0033-5894 1096-0287 https://hdl.handle.net/2440/133246 doi:10.1017/qua.2020.98 Milnes, A.R. [0000-0003-4283-4428] Copyright © University of Washington. Published by Cambridge University Press, 2020. http://dx.doi.org/10.1017/qua.2020.98 Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene Journal article 2020 ftunivadelaidedl https://doi.org/10.1017/qua.2020.98 2023-11-20T23:24:43Z We tested the potential for sand calcites to serve as a novel paleoclimate archive by investigating their age and formation conditions. Fontainebleau sand calcites are Pleistocene in age (based on ¹⁴C and U-Th dating) and were primarily formed during glacial periods. δ¹³C values increase with the depth at which these sand calcites formed, consistent with open and closed CO₂ systems. Interpretation of the δ¹⁸O-T relationship in sand calcites points primarily to their formation at a low temperature, around 2°C in shallow ground water and at about 9°C in deeper ground-water settings. Their occurrence, characteristics, and compositions suggest crystallization from paleo-ground waters in permafrost environments. Crystallization of sand calcites was triggered by degassing of cold carbonate-containing surface waters as they infiltrated warmer subsurface ground-water environments.We consider sand calcites to be important indicators of interactions between meteoric water and ground water in Pleistocene periglacial landscapes. Their disposition may point to specific features of periglacial landscapes, and their ages could permit an assessment of landscape incision rates. Large crystals and zoned spheroliths may, in fact, encapsulate continuous high-resolution records of continental glacial and periglacial paleoenvironments. Médard Thiry, Christophe Innocent, Jean-Pierre Girard, Anthony Richard Milnes, Christine Franke, Sophie Guillon Article in Journal/Newspaper permafrost The University of Adelaide: Digital Library Milnes ENVELOPE(-65.020,-65.020,-65.592,-65.592) Quaternary Research 101 225 244 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene |
spellingShingle |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene Thiry, M. Innocent, C. Girard, J.-P. Milnes, A.R. Franke, C. Guillon, S. Sand calcites as a key to Pleistocene periglacial landscapes |
topic_facet |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene |
description |
We tested the potential for sand calcites to serve as a novel paleoclimate archive by investigating their age and formation conditions. Fontainebleau sand calcites are Pleistocene in age (based on ¹⁴C and U-Th dating) and were primarily formed during glacial periods. δ¹³C values increase with the depth at which these sand calcites formed, consistent with open and closed CO₂ systems. Interpretation of the δ¹⁸O-T relationship in sand calcites points primarily to their formation at a low temperature, around 2°C in shallow ground water and at about 9°C in deeper ground-water settings. Their occurrence, characteristics, and compositions suggest crystallization from paleo-ground waters in permafrost environments. Crystallization of sand calcites was triggered by degassing of cold carbonate-containing surface waters as they infiltrated warmer subsurface ground-water environments.We consider sand calcites to be important indicators of interactions between meteoric water and ground water in Pleistocene periglacial landscapes. Their disposition may point to specific features of periglacial landscapes, and their ages could permit an assessment of landscape incision rates. Large crystals and zoned spheroliths may, in fact, encapsulate continuous high-resolution records of continental glacial and periglacial paleoenvironments. Médard Thiry, Christophe Innocent, Jean-Pierre Girard, Anthony Richard Milnes, Christine Franke, Sophie Guillon |
format |
Article in Journal/Newspaper |
author |
Thiry, M. Innocent, C. Girard, J.-P. Milnes, A.R. Franke, C. Guillon, S. |
author_facet |
Thiry, M. Innocent, C. Girard, J.-P. Milnes, A.R. Franke, C. Guillon, S. |
author_sort |
Thiry, M. |
title |
Sand calcites as a key to Pleistocene periglacial landscapes |
title_short |
Sand calcites as a key to Pleistocene periglacial landscapes |
title_full |
Sand calcites as a key to Pleistocene periglacial landscapes |
title_fullStr |
Sand calcites as a key to Pleistocene periglacial landscapes |
title_full_unstemmed |
Sand calcites as a key to Pleistocene periglacial landscapes |
title_sort |
sand calcites as a key to pleistocene periglacial landscapes |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
https://hdl.handle.net/2440/133246 https://doi.org/10.1017/qua.2020.98 |
long_lat |
ENVELOPE(-65.020,-65.020,-65.592,-65.592) |
geographic |
Milnes |
geographic_facet |
Milnes |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
http://dx.doi.org/10.1017/qua.2020.98 |
op_relation |
Quaternary Research, 2020; 101:225-244 0033-5894 1096-0287 https://hdl.handle.net/2440/133246 doi:10.1017/qua.2020.98 Milnes, A.R. [0000-0003-4283-4428] |
op_rights |
Copyright © University of Washington. Published by Cambridge University Press, 2020. |
op_doi |
https://doi.org/10.1017/qua.2020.98 |
container_title |
Quaternary Research |
container_volume |
101 |
container_start_page |
225 |
op_container_end_page |
244 |
_version_ |
1785572844609994752 |