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 (Δ47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/376216 2023-11-12T04:24:46+01:00 Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures Breitenbach, Sebastian F.M. Mleneck-Vautravers, Maryline J. Grauel, Anna Lena Lo, Li Bernasconi, Stefano M. Müller, Inigo A. Rolfe, James Gázquez, Fernando Greaves, Mervyn Hodell, David A. non-UU output of UU-AW members 2018-09-01 image/pdf https://dspace.library.uu.nl/handle/1874/376216 en eng 0016-7037 https://dspace.library.uu.nl/handle/1874/376216 info:eu-repo/semantics/OpenAccess Clumped isotopes Mg/Ca analysis Paleoceanography Paleoclimatology Planktonic foraminifera Geochemistry and Petrology Article 2018 ftunivutrecht 2023-11-01T23:19:32Z 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 (Δ47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca and Δ47 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 29°C. We provide a new clumped isotope temperature calibrations using subaqueous cave carbonates, which is consistent with recent studies. Tandem Mg/Ca–Δ47 results follow an exponential curve as predicted by temperature calibration equations. Observed deviations from the predicted Mg/Ca-Δ47 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 Δ47 yield concordant results, and can be used to infer the past δ18O of seawater (δ18Osw) for paleoclimate studies. Article in Journal/Newspaper Planktonic foraminifera Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Clumped isotopes Mg/Ca analysis Paleoceanography Paleoclimatology Planktonic foraminifera Geochemistry and Petrology |
spellingShingle |
Clumped isotopes Mg/Ca analysis Paleoceanography Paleoclimatology Planktonic foraminifera Geochemistry and Petrology Breitenbach, Sebastian F.M. Mleneck-Vautravers, Maryline J. Grauel, Anna Lena Lo, Li Bernasconi, Stefano M. Müller, Inigo A. Rolfe, James Gázquez, Fernando Greaves, Mervyn Hodell, David A. Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures |
topic_facet |
Clumped isotopes Mg/Ca analysis Paleoceanography Paleoclimatology Planktonic foraminifera Geochemistry and Petrology |
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 (Δ47) on the same specimens of core top planktonic foraminifera. The strength of this approach is that Mg/Ca and Δ47 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 29°C. We provide a new clumped isotope temperature calibrations using subaqueous cave carbonates, which is consistent with recent studies. Tandem Mg/Ca–Δ47 results follow an exponential curve as predicted by temperature calibration equations. Observed deviations from the predicted Mg/Ca-Δ47 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 Δ47 yield concordant results, and can be used to infer the past δ18O of seawater (δ18Osw) for paleoclimate studies. |
author2 |
non-UU output of UU-AW members |
format |
Article in Journal/Newspaper |
author |
Breitenbach, Sebastian F.M. Mleneck-Vautravers, Maryline J. Grauel, Anna Lena Lo, Li Bernasconi, Stefano M. Müller, Inigo A. Rolfe, James Gázquez, Fernando Greaves, Mervyn Hodell, David A. |
author_facet |
Breitenbach, Sebastian F.M. Mleneck-Vautravers, Maryline J. Grauel, Anna Lena Lo, Li Bernasconi, Stefano M. Müller, Inigo A. Rolfe, James Gázquez, Fernando Greaves, Mervyn Hodell, David A. |
author_sort |
Breitenbach, Sebastian F.M. |
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 |
publishDate |
2018 |
url |
https://dspace.library.uu.nl/handle/1874/376216 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
0016-7037 https://dspace.library.uu.nl/handle/1874/376216 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782339242931781632 |