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

Adam P. Hasenfratz, Ralf Schiebel, David J.R. Thornalley, Joachim Schönfeld, Samuel L. Jaccard, Alfredo Martínez-García, Ann Holbourn, Anne E. Jennings, Wolfgang Kuhnt, Caroline H. Lear, Thomas M. Marchitto, Ursula Quillmann, Yair Rosenthal, Jimin Yu, Gerald H. Haug

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)365-383
Number of pages19
JournalGeochimica et Cosmochimica Acta
Volume217
DOIs
StatePublished - Nov 15 2017

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Keywords

  • Benthic foraminifera
  • Deep-sea temperature reconstruction
  • Melonis barleeanum
  • Melonis pompilioides
  • Mg/Ca paleothermometry
  • Paleoceanography
  • Temperature calibration

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