Mg/Ca and ?18O in the brackish shallow-water benthic foraminifer Ammonia 'beccarii'
Publication date
2011
Authors
Toyofuku, T.
Suzuki, M.
Suga, H.
Sakai, S.
Suzuki, A.
Ishikawa, T.
Nooijer, L.J. de
Schiebel, R.
Kawahata, H.
Kitazato, H.
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Article
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Abstract
Specimens of the benthic foraminifer Ammonia beccarii were cultured in the laboratory in order to determine the relation between temperature and Mg/Ca and oxygen isotope values in their tests. Asexual reproduction in this species provides a large number of juveniles that were allowed to grow into maturity at temperatures ranging from 10 to 27 °C and at salinities ranging from 18 to 33 PSU. The Mg/Ca in a calcite increase exponentially and δ18O decreases linearly with the temperature. Salinity has no significant impact on either Mg/Ca or δ18O. We show how the combination of these two parameters can be used to reconstruct seawater δ18O and temperature in shallow marine habitats.
Keywords
Benthic foraminifera, Mg/Ca, δ18O, Temperature, Salinity, Culture experiment, Shallow water environment, Brackish water