Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases
Neodymium isotopic ratios recorded in calcareous foraminiferal tests (shells) and associated authigenic minerals were used to trace past water masses, although the origin of preserved Nd signals is still a matter of debate. We determined, for the first time, the microscale Nd distribution in two pla...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal.archives-ouvertes.fr/hal-00772939 https://doi.org/10.1016/j.gca.2012.10.010 |
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ftccsdartic:oai:HAL:hal-00772939v1 2023-05-15T18:01:01+02:00 Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases Tachikawa, Kazuyo Toyofuku, Takashi BASILE-DOELSCH, Isabelle Delhaye, Thomas Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) MicroForam and Neosympa (CYBER/LEFE-INSU/CNRS) PICS-Japon (INSU-CNRS) 2013-01-01 https://hal.archives-ouvertes.fr/hal-00772939 https://doi.org/10.1016/j.gca.2012.10.010 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2012.10.010 hal-00772939 https://hal.archives-ouvertes.fr/hal-00772939 doi:10.1016/j.gca.2012.10.010 PRODINRA: 407290 WOS: 000312102100002 http://hal.archives-ouvertes.fr/licences/copyright/ ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.archives-ouvertes.fr/hal-00772939 Geochimica et Cosmochimica Acta, Elsevier, 2013, 100, pp.11-23. ⟨10.1016/j.gca.2012.10.010⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1016/j.gca.2012.10.010 2021-10-24T15:34:12Z Neodymium isotopic ratios recorded in calcareous foraminiferal tests (shells) and associated authigenic minerals were used to trace past water masses, although the origin of preserved Nd signals is still a matter of debate. We determined, for the first time, the microscale Nd distribution in two planktonic foraminifera species (Globigerinoides ruber and Neogloboquadrina dutertrei) and coexisting authigenic minerals from two selected time slices (15.6 and 129 kyr) of a marine sediment core in the Panama Basin. Elemental mapping of Nd, Ca, Fe, Mn, and Si was performed using NanoSIMS ion probe and electron probe microanalysis (EPMA) on uncleaned tests together with scanning electron microscopy (SEM) imagery. EPMA and SEM images revealed the presence of Fe-rich framboidal minerals inside test pores and inner chambers, particularly in the old samples. The young sample presented Fe- and Mn-rich patches on the inner test wall. The Nd intensity in Fe–Mn-rich patches and in some framboids was much higher than in foraminiferal calcite, where the Nd distribution was randomly heterogeneous with no systematic features such as an ontogenic Nd-rich layer or species-specific differences. The relationship between Nd, Fe, and Mn confirmed a significant role of Fe–Mn oxides as a Nd carrier. The high Nd enrichment in some framboids could be explained by Nd adsorption onto oxidized surface of Fe sulfides particles rather than direct incorporation. Since the authigenic precipitates are major Nd carrier phases, the Nd isotopic signals in sedimentary foraminiferal tests likely reflect bottom/pore water values rather than surface water ones. Article in Journal/Newspaper Planktonic foraminifera Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geochimica et Cosmochimica Acta 100 11 23 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Tachikawa, Kazuyo Toyofuku, Takashi BASILE-DOELSCH, Isabelle Delhaye, Thomas Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
Neodymium isotopic ratios recorded in calcareous foraminiferal tests (shells) and associated authigenic minerals were used to trace past water masses, although the origin of preserved Nd signals is still a matter of debate. We determined, for the first time, the microscale Nd distribution in two planktonic foraminifera species (Globigerinoides ruber and Neogloboquadrina dutertrei) and coexisting authigenic minerals from two selected time slices (15.6 and 129 kyr) of a marine sediment core in the Panama Basin. Elemental mapping of Nd, Ca, Fe, Mn, and Si was performed using NanoSIMS ion probe and electron probe microanalysis (EPMA) on uncleaned tests together with scanning electron microscopy (SEM) imagery. EPMA and SEM images revealed the presence of Fe-rich framboidal minerals inside test pores and inner chambers, particularly in the old samples. The young sample presented Fe- and Mn-rich patches on the inner test wall. The Nd intensity in Fe–Mn-rich patches and in some framboids was much higher than in foraminiferal calcite, where the Nd distribution was randomly heterogeneous with no systematic features such as an ontogenic Nd-rich layer or species-specific differences. The relationship between Nd, Fe, and Mn confirmed a significant role of Fe–Mn oxides as a Nd carrier. The high Nd enrichment in some framboids could be explained by Nd adsorption onto oxidized surface of Fe sulfides particles rather than direct incorporation. Since the authigenic precipitates are major Nd carrier phases, the Nd isotopic signals in sedimentary foraminiferal tests likely reflect bottom/pore water values rather than surface water ones. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) MicroForam and Neosympa (CYBER/LEFE-INSU/CNRS) PICS-Japon (INSU-CNRS) |
format |
Article in Journal/Newspaper |
author |
Tachikawa, Kazuyo Toyofuku, Takashi BASILE-DOELSCH, Isabelle Delhaye, Thomas |
author_facet |
Tachikawa, Kazuyo Toyofuku, Takashi BASILE-DOELSCH, Isabelle Delhaye, Thomas |
author_sort |
Tachikawa, Kazuyo |
title |
Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
title_short |
Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
title_full |
Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
title_fullStr |
Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
title_full_unstemmed |
Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
title_sort |
microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-00772939 https://doi.org/10.1016/j.gca.2012.10.010 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.archives-ouvertes.fr/hal-00772939 Geochimica et Cosmochimica Acta, Elsevier, 2013, 100, pp.11-23. ⟨10.1016/j.gca.2012.10.010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2012.10.010 hal-00772939 https://hal.archives-ouvertes.fr/hal-00772939 doi:10.1016/j.gca.2012.10.010 PRODINRA: 407290 WOS: 000312102100002 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ |
op_doi |
https://doi.org/10.1016/j.gca.2012.10.010 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
100 |
container_start_page |
11 |
op_container_end_page |
23 |
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1766170330344194048 |