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Mg/Ca and δ18O in the brackish shallow-water benthic foraminifer Ammonia ‘beccarii’
Authors:Takashi Toyofuku  Masayuki Suzuki  Hisami Suga  Saburo Sakai  Atsushi Suzuki  Tsuyoshi Ishikawa  Lennart Jan de Nooijer  Ralf Schiebel  Hodaka Kawahata  Hiroshi Kitazato
Institution:1. Institute of Biogeosciences (BioGeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushima-cho 2-15, Yokosuka, 237-0061, Japan;2. Research Institute for Hazards in Snowy Areas and Disaster Recovery, Niigata University, Ikarashi Ni-no-cho 8050, Niigata, 950-2181, Japan;3. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan;4. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), B200 Monobe, Nankoku, Kochi, 783-8502, Japan;5. Dept of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;6. Laboratoire des Bio-Indicateurs Actuels et Fossiles (BIAF), University of Angers, 2 Boulevard Lavoisier, 49045 Angers CEDEX, France;7. Graduate School of Frontier Sciences, the University of Tokyo, Kashiwa, Chiba, 277-8561, Japan;8. Department of Geosciences, Shizuoka University, Oya 836, Suruga-ku, Shizuoka, 422-8529, Japan
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.
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