Sand calcites as a key to Pleistocene periglacial landscapes.
International audience 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 valu...
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ftbrgm:oai:HAL:hal-03130317v1 2024-05-19T07:47:12+00:00 Sand calcites as a key to Pleistocene periglacial landscapes. Thiry, Médard Innocent, Christophe Girard, Jean-Pierre Milnes, A.R. Franke, Christine Guillon, Sophie Centre de Géosciences (GEOSCIENCES) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Bureau de Recherches Géologiques et Minières (BRGM) Centre scientifique et Technique Jean Feger (CSTJF) TOTAL FINA ELF University of South Australia Adelaide 2020-12 https://hal.science/hal-03130317 en eng HAL CCSD Elsevier hal-03130317 https://hal.science/hal-03130317 ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.science/hal-03130317 Quaternary Research, 2020 Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2020 ftbrgm 2024-05-02T00:14:15Z International audience 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. Article in Journal/Newspaper permafrost BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
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Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Thiry, Médard Innocent, Christophe Girard, Jean-Pierre Milnes, A.R. Franke, Christine Guillon, Sophie Sand calcites as a key to Pleistocene periglacial landscapes. |
topic_facet |
Sand calcite Isotope Glacial period Paleohydrology Paleolandscape Pleistocene [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Centre de Géosciences (GEOSCIENCES) Mines Paris - PSL (École nationale supérieure des mines de Paris) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Bureau de Recherches Géologiques et Minières (BRGM) Centre scientifique et Technique Jean Feger (CSTJF) TOTAL FINA ELF University of South Australia Adelaide |
format |
Article in Journal/Newspaper |
author |
Thiry, Médard Innocent, Christophe Girard, Jean-Pierre Milnes, A.R. Franke, Christine Guillon, Sophie |
author_facet |
Thiry, Médard Innocent, Christophe Girard, Jean-Pierre Milnes, A.R. Franke, Christine Guillon, Sophie |
author_sort |
Thiry, Médard |
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 |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03130317 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
ISSN: 0033-5894 EISSN: 1096-0287 Quaternary Research https://hal.science/hal-03130317 Quaternary Research, 2020 |
op_relation |
hal-03130317 https://hal.science/hal-03130317 |
_version_ |
1799487536649732096 |