Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature?
International audience The hypothesis of a climate variability within the last interglacial (Eemian), suggested by oxygen isotope data of a Greenland ice core (GRIP) was later supported by magnetic susceptibility, organic matter and pollen signatures in the Eemian lake sediments of the Lac du Bouche...
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ftinsu:oai:HAL:hal-01419486v1 2023-12-17T10:31:04+01:00 Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? Stockhausen, Hagen Thouveny, Nicolas Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 1999 https://amu.hal.science/hal-01419486 https://doi.org/10.1016/S0012-821X(99)00237-X en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(99)00237-X hal-01419486 https://amu.hal.science/hal-01419486 doi:10.1016/S0012-821X(99)00237-X ISSN: 0012-821X Earth and Planetary Science Letters https://amu.hal.science/hal-01419486 Earth and Planetary Science Letters, 1999, 173, pp.299 - 313. ⟨10.1016/S0012-821X(99)00237-X⟩ Eemian magnetic susceptibility lake sediments [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 1999 ftinsu https://doi.org/10.1016/S0012-821X(99)00237-X 2023-11-22T17:49:54Z International audience The hypothesis of a climate variability within the last interglacial (Eemian), suggested by oxygen isotope data of a Greenland ice core (GRIP) was later supported by magnetic susceptibility, organic matter and pollen signatures in the Eemian lake sediments of the Lac du Bouchet (France). In the present paper, we analyse in detail the rock-magnetic properties of these sediments in order to determine the origin of the magnetic susceptibility variations. Furthermore, in order to verify the empirical relation between magnetic susceptibility and climate, we studied two Eemian sequences from neighbouring lakes (Lac St. Front and Ribains maar lake). Rock-magnetic investigations mainly consisted of analyses of anhysteretic and isothermal remanent magnetizations along with hysteresis measurements carried out on pilot samples. Lac du Bouchet susceptibility variations are at least partly affected by postdepositional magnetite dissolution. Lac St. Front sediments show a complex behaviour resulting in partly contradicting interpretations of rock-magnetic parameters. Possible explanations may be the presence of a very fine-grained magnetite or the presence of maghemite. Ribains maar lake sediments show a homogeneous magnetic mineralogy without major variations in most of the rock-magnetic parameters. Susceptibility records of the three lakes were compared under the simplified assumption that magnetic susceptibility mainly reflects variations of the detrital (titano-)magnetite input. Only a poor correlation between the three Eemian susceptibility sequences is observed, suggesting that local effects (including dissolution and dilution effects) may have altered the original detrital (climatic) signal. The purely detrital origin of the Lac du Bouchet Eemian susceptibility variations must thus be questioned but it nevertheless appears to be the only lake whose susceptibility variations can tentatively be correlated with the GRIP Eemian oxygen isotope record. Article in Journal/Newspaper Greenland Greenland ice core GRIP ice core Institut national des sciences de l'Univers: HAL-INSU Greenland Lac du Bouchet ENVELOPE(69.230,69.230,-49.372,-49.372) Earth and Planetary Science Letters 173 3 299 313 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Eemian magnetic susceptibility lake sediments [SDU]Sciences of the Universe [physics] |
spellingShingle |
Eemian magnetic susceptibility lake sediments [SDU]Sciences of the Universe [physics] Stockhausen, Hagen Thouveny, Nicolas Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
topic_facet |
Eemian magnetic susceptibility lake sediments [SDU]Sciences of the Universe [physics] |
description |
International audience The hypothesis of a climate variability within the last interglacial (Eemian), suggested by oxygen isotope data of a Greenland ice core (GRIP) was later supported by magnetic susceptibility, organic matter and pollen signatures in the Eemian lake sediments of the Lac du Bouchet (France). In the present paper, we analyse in detail the rock-magnetic properties of these sediments in order to determine the origin of the magnetic susceptibility variations. Furthermore, in order to verify the empirical relation between magnetic susceptibility and climate, we studied two Eemian sequences from neighbouring lakes (Lac St. Front and Ribains maar lake). Rock-magnetic investigations mainly consisted of analyses of anhysteretic and isothermal remanent magnetizations along with hysteresis measurements carried out on pilot samples. Lac du Bouchet susceptibility variations are at least partly affected by postdepositional magnetite dissolution. Lac St. Front sediments show a complex behaviour resulting in partly contradicting interpretations of rock-magnetic parameters. Possible explanations may be the presence of a very fine-grained magnetite or the presence of maghemite. Ribains maar lake sediments show a homogeneous magnetic mineralogy without major variations in most of the rock-magnetic parameters. Susceptibility records of the three lakes were compared under the simplified assumption that magnetic susceptibility mainly reflects variations of the detrital (titano-)magnetite input. Only a poor correlation between the three Eemian susceptibility sequences is observed, suggesting that local effects (including dissolution and dilution effects) may have altered the original detrital (climatic) signal. The purely detrital origin of the Lac du Bouchet Eemian susceptibility variations must thus be questioned but it nevertheless appears to be the only lake whose susceptibility variations can tentatively be correlated with the GRIP Eemian oxygen isotope record. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Stockhausen, Hagen Thouveny, Nicolas |
author_facet |
Stockhausen, Hagen Thouveny, Nicolas |
author_sort |
Stockhausen, Hagen |
title |
Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
title_short |
Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
title_full |
Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
title_fullStr |
Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
title_full_unstemmed |
Rock-magnetic properties of Eemian maar lake sediments from Massif Central, France: a climatic signature? |
title_sort |
rock-magnetic properties of eemian maar lake sediments from massif central, france: a climatic signature? |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://amu.hal.science/hal-01419486 https://doi.org/10.1016/S0012-821X(99)00237-X |
long_lat |
ENVELOPE(69.230,69.230,-49.372,-49.372) |
geographic |
Greenland Lac du Bouchet |
geographic_facet |
Greenland Lac du Bouchet |
genre |
Greenland Greenland ice core GRIP ice core |
genre_facet |
Greenland Greenland ice core GRIP ice core |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://amu.hal.science/hal-01419486 Earth and Planetary Science Letters, 1999, 173, pp.299 - 313. ⟨10.1016/S0012-821X(99)00237-X⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0012-821X(99)00237-X hal-01419486 https://amu.hal.science/hal-01419486 doi:10.1016/S0012-821X(99)00237-X |
op_doi |
https://doi.org/10.1016/S0012-821X(99)00237-X |
container_title |
Earth and Planetary Science Letters |
container_volume |
173 |
container_issue |
3 |
container_start_page |
299 |
op_container_end_page |
313 |
_version_ |
1785584217417056256 |