In situ measurements of Li isotopes in foraminifera
International audience In situ measurement of Li isotope ratios in foraminifera has been developed using a Cameca ims 1270 ion microprobe. In situ d 7 Li analyses have been performed in biogenic calcite of planktonic foraminifera from various locations. Results show that for west Pacific mixed Globi...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hal.science/hal-03130874 https://hal.science/hal-03130874/document https://hal.science/hal-03130874/file/2006GC001432.pdf https://doi.org/10.1029/2006GC001432 |
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ftinsu:oai:HAL:hal-03130874v1 2024-02-11T10:08:03+01:00 In situ measurements of Li isotopes in foraminifera Vigier, Nathalie Rollion-Bard, Claire Spezzaferri, Silvia Brunet, Fabrice Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) 2007-01 https://hal.science/hal-03130874 https://hal.science/hal-03130874/document https://hal.science/hal-03130874/file/2006GC001432.pdf https://doi.org/10.1029/2006GC001432 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GC001432 hal-03130874 https://hal.science/hal-03130874 https://hal.science/hal-03130874/document https://hal.science/hal-03130874/file/2006GC001432.pdf doi:10.1029/2006GC001432 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03130874 Geochemistry, Geophysics, Geosystems, 2007, 8 (1), pp.n/a-n/a. ⟨10.1029/2006GC001432⟩ ion microprobe lithium isotopes foraminifera [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.1029/2006GC001432 2024-01-24T17:32:18Z International audience In situ measurement of Li isotope ratios in foraminifera has been developed using a Cameca ims 1270 ion microprobe. In situ d 7 Li analyses have been performed in biogenic calcite of planktonic foraminifera from various locations. Results show that for west Pacific mixed Globigerinoides and Globorotalia (22°S161°E), the isotopic variability between tests and within a single test, respectively, is not significantly greater than estimated analytical uncertainty ($1.5%). Mean d 7 Li for several planktonic foraminifera tests corresponds to the seawater value, strongly suggesting negligible Li isotope fractionation relative to seawater, as previously inferred by Hall et al. (2005) using thermo-ionization mass spectrometer and multicollector-inductively coupled plasma-mass spectrometry techniques. Combined with scanning electron microscopy and ion microprobe imaging, micron-sized grains, enriched in lithium, silica and aluminum have been found in the foraminifera calcite matrix. A simple mixing model shows that 0.3-2 wt % of marine clays incorporated within the analyzed calcite would lower the foraminifera d 7 Li value, by 3% to 10% relative to the isotopic composition of the pure calcite. By comparison, no such grains have been detected in corals. The presence of micron-sized silicate grains embedded within the foraminifera calcite is consistent with the Erez (2003) biomineralization model, involving calcite precipitation from seawater vacuoles. By contrast, coral calcium carbonate is instead precipitated from ions, which have been pumped or diffused through several membranes, impermeable to micrometric grains. Ion microprobe in situ d 7 Li measurements in biogenic calcite present new methods for investigating both biomineralization processes and the past record of the ocean composition by exploring geochemical variations at a scale that is smaller in space and in time. Article in Journal/Newspaper Planktonic foraminifera Institut national des sciences de l'Univers: HAL-INSU Pacific Geochemistry, Geophysics, Geosystems 8 1 n/a n/a |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
ion microprobe lithium isotopes foraminifera [SDU]Sciences of the Universe [physics] |
spellingShingle |
ion microprobe lithium isotopes foraminifera [SDU]Sciences of the Universe [physics] Vigier, Nathalie Rollion-Bard, Claire Spezzaferri, Silvia Brunet, Fabrice In situ measurements of Li isotopes in foraminifera |
topic_facet |
ion microprobe lithium isotopes foraminifera [SDU]Sciences of the Universe [physics] |
description |
International audience In situ measurement of Li isotope ratios in foraminifera has been developed using a Cameca ims 1270 ion microprobe. In situ d 7 Li analyses have been performed in biogenic calcite of planktonic foraminifera from various locations. Results show that for west Pacific mixed Globigerinoides and Globorotalia (22°S161°E), the isotopic variability between tests and within a single test, respectively, is not significantly greater than estimated analytical uncertainty ($1.5%). Mean d 7 Li for several planktonic foraminifera tests corresponds to the seawater value, strongly suggesting negligible Li isotope fractionation relative to seawater, as previously inferred by Hall et al. (2005) using thermo-ionization mass spectrometer and multicollector-inductively coupled plasma-mass spectrometry techniques. Combined with scanning electron microscopy and ion microprobe imaging, micron-sized grains, enriched in lithium, silica and aluminum have been found in the foraminifera calcite matrix. A simple mixing model shows that 0.3-2 wt % of marine clays incorporated within the analyzed calcite would lower the foraminifera d 7 Li value, by 3% to 10% relative to the isotopic composition of the pure calcite. By comparison, no such grains have been detected in corals. The presence of micron-sized silicate grains embedded within the foraminifera calcite is consistent with the Erez (2003) biomineralization model, involving calcite precipitation from seawater vacuoles. By contrast, coral calcium carbonate is instead precipitated from ions, which have been pumped or diffused through several membranes, impermeable to micrometric grains. Ion microprobe in situ d 7 Li measurements in biogenic calcite present new methods for investigating both biomineralization processes and the past record of the ocean composition by exploring geochemical variations at a scale that is smaller in space and in time. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) |
format |
Article in Journal/Newspaper |
author |
Vigier, Nathalie Rollion-Bard, Claire Spezzaferri, Silvia Brunet, Fabrice |
author_facet |
Vigier, Nathalie Rollion-Bard, Claire Spezzaferri, Silvia Brunet, Fabrice |
author_sort |
Vigier, Nathalie |
title |
In situ measurements of Li isotopes in foraminifera |
title_short |
In situ measurements of Li isotopes in foraminifera |
title_full |
In situ measurements of Li isotopes in foraminifera |
title_fullStr |
In situ measurements of Li isotopes in foraminifera |
title_full_unstemmed |
In situ measurements of Li isotopes in foraminifera |
title_sort |
in situ measurements of li isotopes in foraminifera |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-03130874 https://hal.science/hal-03130874/document https://hal.science/hal-03130874/file/2006GC001432.pdf https://doi.org/10.1029/2006GC001432 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03130874 Geochemistry, Geophysics, Geosystems, 2007, 8 (1), pp.n/a-n/a. ⟨10.1029/2006GC001432⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2006GC001432 hal-03130874 https://hal.science/hal-03130874 https://hal.science/hal-03130874/document https://hal.science/hal-03130874/file/2006GC001432.pdf doi:10.1029/2006GC001432 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2006GC001432 |
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Geochemistry, Geophysics, Geosystems |
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8 |
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1 |
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