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

Hasenfratz, A. P., Schiebel, R., Thornalley, D. J. R., Schoenfeld, J., Jaccard, S. L., Martinez-Garcia, A., et al. (2017). Mg/Ca-temperature calibration for the benthic foraminifera Melonis barleeanum and Melonis pompilioides. Geochimica et Cosmochimica Acta, 217, 365-383. doi:10.1016/j.gca.2017.08.038.

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 Creators:
Hasenfratz, Adam P.1, Author
Schiebel, R.2, Author           
Thornalley, David J. R.1, Author
Schoenfeld, Joachim1, Author
Jaccard, Samuel L.1, Author
Martinez-Garcia, A.2, Author           
Holbourn, Ann1, Author
Jennings, Anne E.1, Author
Kuhnt, Wolfgang1, Author
Lear, Caroline H.1, Author
Marchitto, Thomas M.1, Author
Quillmann, Ursula1, Author
Rosenthal, Yair1, Author
Yu, Jimin1, Author
Haug, Gerald H.2, Author           
Affiliations:
1external, ou_persistent22              
2Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              

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 Abstract: 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[CO32−]). 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[CO32−], and varying morphotypes have no apparent effect on the Mg/Ca-temperature relationship, but pore water Δ[CO32−] might have had an influence on some of the samples from the tropical Atlantic.

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 Dates: 2017
 Publication Status: Issued
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 Rev. Type: -
 Identifiers: ISI: 000411362000022
DOI: 10.1016/j.gca.2017.08.038
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Title: Geochimica et Cosmochimica Acta
  Abbreviation : Geochim. Cosmochim. Acta
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 217 Sequence Number: - Start / End Page: 365 - 383 Identifier: ISSN: 0016-7037
CoNE: https://pure.mpg.de/cone/journals/resource/954925401558