Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures

Sebastian F.M. Breitenbach, Maryline J. Mleneck-Vautravers, Anna Lena Grauel, Li Lo, Stefano M. Bernasconi, Inigo A. Müller, James Rolfe, Fernando Gázquez, Mervyn Greaves, David A. Hodell

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

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.

Originalspracheenglisch
Seiten (von - bis)283-296
Seitenumfang14
FachzeitschriftGeochimica et Cosmochimica Acta
Jahrgang236
DOIs
PublikationsstatusVeröffentlicht - 1 Sep 2018

Fingerprint

Isotopes
foraminifera
water temperature
isotope
Water
temperature
planktonic foraminifera
Seawater
paleoclimate
Temperature
Calibration
seawater
calibration
Caves
paleotemperature
Carbonates
Trace Elements
Oxides
cave
Cleaning

Schlagwörter

    ASJC Scopus subject areas

    • !!Geochemistry and Petrology

    Dies zitieren

    Breitenbach, S. F. M., Mleneck-Vautravers, M. J., Grauel, A. L., Lo, L., Bernasconi, S. M., Müller, I. A., ... Hodell, D. A. (2018). Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures. Geochimica et Cosmochimica Acta, 236, 283-296. https://doi.org/10.1016/j.gca.2018.03.010

    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.

    in: Geochimica et Cosmochimica Acta, Jahrgang 236, 01.09.2018, S. 283-296.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Breitenbach, SFM, Mleneck-Vautravers, MJ, Grauel, AL, Lo, L, Bernasconi, SM, Müller, IA, Rolfe, J, Gázquez, F, Greaves, M & Hodell, DA 2018, 'Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures' Geochimica et Cosmochimica Acta, Jg. 236, S. 283-296. https://doi.org/10.1016/j.gca.2018.03.010
    Breitenbach SFM, Mleneck-Vautravers MJ, Grauel AL, Lo L, Bernasconi SM, Müller IA et al. Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures. Geochimica et Cosmochimica Acta. 2018 Sep 1;236:283-296. https://doi.org/10.1016/j.gca.2018.03.010
    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. in: Geochimica et Cosmochimica Acta. 2018 ; Jahrgang 236. S. 283-296.
    @article{b5b6e67286d94000876fae1433a01f47,
    title = "Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures",
    abstract = "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.",
    keywords = "Clumped isotopes, Mg/Ca analysis, Paleoceanography, Paleoclimatology, Planktonic foraminifera",
    author = "Breitenbach, {Sebastian F.M.} and Mleneck-Vautravers, {Maryline J.} and Grauel, {Anna Lena} and Li Lo and Bernasconi, {Stefano M.} and M{\"u}ller, {Inigo A.} and James Rolfe and Fernando G{\'a}zquez and Mervyn Greaves and Hodell, {David A.}",
    year = "2018",
    month = "9",
    day = "1",
    doi = "10.1016/j.gca.2018.03.010",
    language = "English",
    volume = "236",
    pages = "283--296",
    journal = "Geochimica et Cosmochimica Acta",
    issn = "0016-7037",
    publisher = "Elsevier Limited",

    }

    TY - JOUR

    T1 - Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures

    AU - Breitenbach, Sebastian F.M.

    AU - Mleneck-Vautravers, Maryline J.

    AU - Grauel, Anna Lena

    AU - Lo, Li

    AU - Bernasconi, Stefano M.

    AU - Müller, Inigo A.

    AU - Rolfe, James

    AU - Gázquez, Fernando

    AU - Greaves, Mervyn

    AU - Hodell, David A.

    PY - 2018/9/1

    Y1 - 2018/9/1

    N2 - 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.

    AB - 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.

    KW - Clumped isotopes

    KW - Mg/Ca analysis

    KW - Paleoceanography

    KW - Paleoclimatology

    KW - Planktonic foraminifera

    UR - http://www.scopus.com/inward/record.url?scp=85045017561&partnerID=8YFLogxK

    U2 - 10.1016/j.gca.2018.03.010

    DO - 10.1016/j.gca.2018.03.010

    M3 - Article

    VL - 236

    SP - 283

    EP - 296

    JO - Geochimica et Cosmochimica Acta

    JF - Geochimica et Cosmochimica Acta

    SN - 0016-7037

    ER -