Sr/Ca δ88/86Sr and δ44/40Ca as a Tool to Study Corals' Calcification Mechanisms

Fruchter, Noa (2014) Sr/Ca δ88/86Sr and δ44/40Ca as a Tool to Study Corals' Calcification Mechanisms (Doctoral thesis/PhD), Christian-Albrechts-Universität, Kiel, Germany, 90 pp

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Abstract

We observe a strong kinetic effect on Ca incorporation in aragonite. This effect is observed in both inorganic aragonite and in corals. As the rate of precipitation increases the isotope fractionation decreases (44Ca/40Ca). At high precipitation rates above ~104.0 μmol·m-2·h-1 the fractionation becomes constant in a minimum fractionation point. Since corals calcify at high rates of 103.9 μmol·m-2·h-1 and above, no rate effect on Ca isotopes fractionation is expected. Ionic strength appears to have insignificant effect on Ca incorporation of inorganic aragonite. We hypothesize that Ca isotope fractionation in corals is controlled by the saturation state in the extracellular fluid and the rate of calcification.

Document Type: Thesis (Doctoral thesis/PhD)
Thesis Advisors: Eisenhauer, Anton and Hansteen, Thor
Keywords: Corals; Sr/Ca; Isotope Geochemistry; Aragonite
Research affiliation: OceanRep > SFB 754 > B7
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 754
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Projects: CalMarO, SFB754
Date Deposited: 06 May 2020 09:14
Last Modified: 06 May 2020 09:14
URI: http://eprints.uni-kiel.de/id/eprint/49612

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