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...
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Online Access: | https://hal.science/hal-00772939 https://doi.org/10.1016/j.gca.2012.10.010 |
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ftcollegfrance:oai:HAL:hal-00772939v1 2024-10-13T14:10:21+00:00 Microscale neodymium distribution in sedimentary planktonic foraminiferal tests and associated mineral phases Tachikawa, K. Toyofuku, Takashi Basile-Doelsch, Isabelle Delhaye, Thomas 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) MicroForam and Neosympa (CYBER/LEFE-INSU/CNRS) PICS-Japon (INSU-CNRS) 2013-01-01 https://hal.science/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 doi:10.1016/j.gca.2012.10.010 PRODINRA: 407290 WOS: 000312102100002 http://hal.archives-ouvertes.fr/licences/copyright/ ISSN: 0016-7037 EISSN: 1872-9533 Geochimica et Cosmochimica Acta https://hal.science/hal-00772939 Geochimica et Cosmochimica Acta, 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 ftcollegfrance https://doi.org/10.1016/j.gca.2012.10.010 2024-09-29T23:37:57Z 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 Collège de France: HAL Geochimica et Cosmochimica Acta 100 11 23 |
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Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Tachikawa, K. 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) 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) MicroForam and Neosympa (CYBER/LEFE-INSU/CNRS) PICS-Japon (INSU-CNRS) |
format |
Article in Journal/Newspaper |
author |
Tachikawa, K. Toyofuku, Takashi Basile-Doelsch, Isabelle Delhaye, Thomas |
author_facet |
Tachikawa, K. Toyofuku, Takashi Basile-Doelsch, Isabelle Delhaye, Thomas |
author_sort |
Tachikawa, K. |
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.science/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: 1872-9533 Geochimica et Cosmochimica Acta https://hal.science/hal-00772939 Geochimica et Cosmochimica Acta, 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 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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1812817589287518208 |