Mg/Ca-temperature calibration for the benthic foraminifera Melonis barleeanum and Melonis pompilioides

Hasenfratz, Adam P., Schiebel, Ralf, Thornalley, David J.R., Schönfeld, Joachim, Jaccard, Samuel L., Martínez-García, Alfredo, Holbourn, Ann, Jennings, Anne E., Kuhnt, Wolfgang, Lear, Caroline H., Marchitto, Thomas M., Quillmann, Ursula, Rosenthal, Yair, Yu, Jimin and Haug, Gerald H. (2017) Mg/Ca-temperature calibration for the benthic foraminifera Melonis barleeanum and Melonis pompilioides Geochimica et Cosmochimica Acta, 217 . pp. 365-383. DOI 10.1016/j.gca.2017.08.038.

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An important tool for deep-sea temperature reconstruction is Mg/Ca paleothermometry applied to benthic foraminifera. Foraminifera of the genus Melonis appear to be promising candidates for temperature reconstructions due to their wide geographical and bathymetric distribution, and their infaunal habitat, which was suggested to reduce secondary effects from carbonate ion saturation (Δ[CO3 2−]). Here, we make substantial advances to previous calibration efforts and present new multi-lab Mg/Ca data for Melonis barleeanum and Melonis pompilioides from more than one hundred core top samples spanning in situ bottom temperatures from −1 to 16 °C, coupled with morphometric analyses of the foraminifer tests. Both species and their morphotypes seem to have a similar response of Mg/Ca to growth temperature. Compilation of new and previously published data reveals a linear dependence of temperature on Mg/Ca, with a best fit of Mg/Ca (mmol/mol) = 0.113 ± 0.005 ∗ BWT (°C) + 0.792 ± 0.036 (r2 = 0.81; n = 120; 1σ SD). Salinity, bottom water Δ[CO3 2−], and varying morphotypes have no apparent effect on the Mg/Ca-temperature relationship, but pore water Δ[CO3 2−] might have had an influence on some of the samples from the tropical Atlantic.

Document Type: Article
Keywords: Paleoceanography; Mg/Ca paleothermometry; Temperature calibration; Deep-sea temperature reconstruction; Benthic foraminifera; Melonis barleeanum; Melonis pompilioides;
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1016/j.gca.2017.08.038
ISSN: 0016-7037
Projects: Future Ocean
Date Deposited: 02 Oct 2017 07:09
Last Modified: 04 Feb 2019 14:27

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