Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures
The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness of two paleotemperature proxies by combining Mg/Ca and clumped isotopes (D47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://doi.org/10.1016/j.gca.2018.03.010 |
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ftzenodo:oai:zenodo.org:3755507 2024-09-15T18:30:56+00:00 Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures Breitenbach, Sebastian Franz Martin Mleneck-Vautravers, Maryline Grauel, Anna-Lena Lo, Li Bernasconi, Stefano Mueller, Inigo Rolfe, James Gazquez, Fernando Greaves, Mervyn Hodell, David 2018-03-16 https://doi.org/10.1016/j.gca.2018.03.010 unknown Zenodo https://doi.org/10.1016/j.gca.2018.03.010 oai:zenodo.org:3755507 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2018 ftzenodo https://doi.org/10.1016/j.gca.2018.03.010 2024-07-26T23:47:56Z The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness of two paleotemperature proxies by combining Mg/Ca and clumped isotopes (D47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca and D47 are measured on the same specimens of foraminifera, thereby providing two independent estimates of temperature. This replication constitutes a rigorous test of individual methods with the advantage that the same approach can be applied to fossil specimens. Aliquots for Mg/Ca and clumped analyses are treated in the same manner following a modified cleaning procedure of foraminifera for trace element and isotopic analyses. We analysed eight species of planktonic foraminifera from coretop samples over a wide range of temperatures from 2 to 29C. We provide a new clumped isotope temperature calibrations using subaqueous cave carbonates, which is consistent with recent studies. Tandem Mg/Ca–D47 results follow an exponential curve as predicted by temperature calibration equations. Observed deviations from the predicted Mg/Ca-D47 relationship are attributed to the effects of Fe-Mn oxide coatings, contamination, or dissolution of foraminiferal tests. This coupled approach provides a high degree of confidence in temperature estimates when Mg/Ca and D47 yield concordant results, and can be used to infer the past d18O of seawater (d18Osw) for paleoclimate studies. Article in Journal/Newspaper Planktonic foraminifera Zenodo Geochimica et Cosmochimica Acta 236 283 296 |
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description |
The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness of two paleotemperature proxies by combining Mg/Ca and clumped isotopes (D47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca and D47 are measured on the same specimens of foraminifera, thereby providing two independent estimates of temperature. This replication constitutes a rigorous test of individual methods with the advantage that the same approach can be applied to fossil specimens. Aliquots for Mg/Ca and clumped analyses are treated in the same manner following a modified cleaning procedure of foraminifera for trace element and isotopic analyses. We analysed eight species of planktonic foraminifera from coretop samples over a wide range of temperatures from 2 to 29C. We provide a new clumped isotope temperature calibrations using subaqueous cave carbonates, which is consistent with recent studies. Tandem Mg/Ca–D47 results follow an exponential curve as predicted by temperature calibration equations. Observed deviations from the predicted Mg/Ca-D47 relationship are attributed to the effects of Fe-Mn oxide coatings, contamination, or dissolution of foraminiferal tests. This coupled approach provides a high degree of confidence in temperature estimates when Mg/Ca and D47 yield concordant results, and can be used to infer the past d18O of seawater (d18Osw) for paleoclimate studies. |
format |
Article in Journal/Newspaper |
author |
Breitenbach, Sebastian Franz Martin Mleneck-Vautravers, Maryline Grauel, Anna-Lena Lo, Li Bernasconi, Stefano Mueller, Inigo Rolfe, James Gazquez, Fernando Greaves, Mervyn Hodell, David |
spellingShingle |
Breitenbach, Sebastian Franz Martin Mleneck-Vautravers, Maryline Grauel, Anna-Lena Lo, Li Bernasconi, Stefano Mueller, Inigo Rolfe, James Gazquez, Fernando Greaves, Mervyn Hodell, David Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
author_facet |
Breitenbach, Sebastian Franz Martin Mleneck-Vautravers, Maryline Grauel, Anna-Lena Lo, Li Bernasconi, Stefano Mueller, Inigo Rolfe, James Gazquez, Fernando Greaves, Mervyn Hodell, David |
author_sort |
Breitenbach, Sebastian Franz Martin |
title |
Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
title_short |
Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
title_full |
Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
title_fullStr |
Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
title_full_unstemmed |
Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
title_sort |
coupled mg/ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://doi.org/10.1016/j.gca.2018.03.010 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://doi.org/10.1016/j.gca.2018.03.010 oai:zenodo.org:3755507 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1016/j.gca.2018.03.010 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
236 |
container_start_page |
283 |
op_container_end_page |
296 |
_version_ |
1810472498564694016 |