Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS
Incorporation of boron into foraminiferal shells is thought to be primarily governed by the carbonate chemistry of the ambient seawater, suggesting that it can be reconstructed from B/Ca ratios. To this end, B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi from South Atlantic core top...
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Geological Society of America
2011
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Online Access: | https://oceanrep.geomar.de/id/eprint/12836/ https://oceanrep.geomar.de/id/eprint/12836/1/1039_002.pdf https://doi.org/10.1130/G32009.1 |
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ftoceanrep:oai:oceanrep.geomar.de:12836 2023-05-15T14:11:11+02:00 Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS Raitzsch, Markus Hathorne, Ed C. Kuhnert, Henning Groeneveld, Jeroen Bickert, Torsten 2011-12 text https://oceanrep.geomar.de/id/eprint/12836/ https://oceanrep.geomar.de/id/eprint/12836/1/1039_002.pdf https://doi.org/10.1130/G32009.1 en eng Geological Society of America https://oceanrep.geomar.de/id/eprint/12836/1/1039_002.pdf Raitzsch, M., Hathorne, E. C. , Kuhnert, H., Groeneveld, J. and Bickert, T. (2011) Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS. Geology, 39 (11). pp. 1039-1042. DOI 10.1130/G32009.1 <https://doi.org/10.1130/G32009.1>. doi:10.1130/G32009.1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2011 ftoceanrep https://doi.org/10.1130/G32009.1 2023-04-07T15:01:25Z Incorporation of boron into foraminiferal shells is thought to be primarily governed by the carbonate chemistry of the ambient seawater, suggesting that it can be reconstructed from B/Ca ratios. To this end, B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi from South Atlantic core top samples have been analyzed using laser ablation−inductively coupled plasma−mass spectroscopy (LA-ICP-MS) to provide additional information on intratest trace element heterogeneity. Results show that boron is heterogeneously distributed within and between shells, with content variations of approximately ±43% displayed within a single shell. B/Ca is higher in the youngest chambers, opposite to the observed between-chamber variability of Mg/Ca. This may be explained by ontogenetic changes of physiological processes that increase the pH of the calcifying fluid and thus the borate concentration while decreasing Mg/Ca to promote calcification. Despite this heterogeneity, mean B/Ca ratios are positively correlated with the deepwater calcite saturation state (Δ[CO32–]), in line with previous studies. We apply this empirical relationship to reconstruct Δ[CO32–] for the late Pleistocene to Holocene using samples from a depth transect in the equatorial Atlantic. Reconstructed Δ[CO32–] values confirm previous studies suggesting that CaCO3-oversaturated North Atlantic Deep Water was reduced during glacial periods, whereas CaCO3-undersaturated Antarctic Bottom Water expanded vertically and propagated northwards. In summary, our data demonstrate that bulk B/Ca in P. wuellerstorfi reliably reflects variations in Δ[CO32–], despite the strong physiological control of boron incorporation. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Geology 39 11 1039 1042 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Incorporation of boron into foraminiferal shells is thought to be primarily governed by the carbonate chemistry of the ambient seawater, suggesting that it can be reconstructed from B/Ca ratios. To this end, B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi from South Atlantic core top samples have been analyzed using laser ablation−inductively coupled plasma−mass spectroscopy (LA-ICP-MS) to provide additional information on intratest trace element heterogeneity. Results show that boron is heterogeneously distributed within and between shells, with content variations of approximately ±43% displayed within a single shell. B/Ca is higher in the youngest chambers, opposite to the observed between-chamber variability of Mg/Ca. This may be explained by ontogenetic changes of physiological processes that increase the pH of the calcifying fluid and thus the borate concentration while decreasing Mg/Ca to promote calcification. Despite this heterogeneity, mean B/Ca ratios are positively correlated with the deepwater calcite saturation state (Δ[CO32–]), in line with previous studies. We apply this empirical relationship to reconstruct Δ[CO32–] for the late Pleistocene to Holocene using samples from a depth transect in the equatorial Atlantic. Reconstructed Δ[CO32–] values confirm previous studies suggesting that CaCO3-oversaturated North Atlantic Deep Water was reduced during glacial periods, whereas CaCO3-undersaturated Antarctic Bottom Water expanded vertically and propagated northwards. In summary, our data demonstrate that bulk B/Ca in P. wuellerstorfi reliably reflects variations in Δ[CO32–], despite the strong physiological control of boron incorporation. |
format |
Article in Journal/Newspaper |
author |
Raitzsch, Markus Hathorne, Ed C. Kuhnert, Henning Groeneveld, Jeroen Bickert, Torsten |
spellingShingle |
Raitzsch, Markus Hathorne, Ed C. Kuhnert, Henning Groeneveld, Jeroen Bickert, Torsten Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
author_facet |
Raitzsch, Markus Hathorne, Ed C. Kuhnert, Henning Groeneveld, Jeroen Bickert, Torsten |
author_sort |
Raitzsch, Markus |
title |
Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
title_short |
Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
title_full |
Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
title_fullStr |
Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
title_full_unstemmed |
Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS |
title_sort |
modern and late pleistocene b/ca ratios of the benthic foraminifer planulina wuellerstorfi determined with laser ablation icp-ms |
publisher |
Geological Society of America |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/12836/ https://oceanrep.geomar.de/id/eprint/12836/1/1039_002.pdf https://doi.org/10.1130/G32009.1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/12836/1/1039_002.pdf Raitzsch, M., Hathorne, E. C. , Kuhnert, H., Groeneveld, J. and Bickert, T. (2011) Modern and late Pleistocene B/Ca ratios of the benthic foraminifer Planulina wuellerstorfi determined with laser ablation ICP-MS. Geology, 39 (11). pp. 1039-1042. DOI 10.1130/G32009.1 <https://doi.org/10.1130/G32009.1>. doi:10.1130/G32009.1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G32009.1 |
container_title |
Geology |
container_volume |
39 |
container_issue |
11 |
container_start_page |
1039 |
op_container_end_page |
1042 |
_version_ |
1766283299182870528 |