Calcium isotope fractionation in modern scleractinian corals

Böhm, Florian, Gussone, Nikolaus, Eisenhauer, Anton, Dullo, Wolf-Christian, Reynaud, S. and Paytan, A. (2006) Calcium isotope fractionation in modern scleractinian corals Geochimica et Cosmochimica Acta, 70 . pp. 4452-4462. DOI 10.1016/j.gca.2006.06.1546.

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Abstract

The 44Ca/40Ca ratios of cultured (Acropora sp.) and open ocean (Pavona clavus, Porites sp.) tropical reef corals are positively correlated with growth temperature. The slope of the temperature–fractionation relation is similar to inorganic aragonite precipitates. However, δ44/40Ca of the coral aragonite is offset from inorganic and sclerosponge aragonite by about +0.5‰. This offset can neither be explained by the very fast, biologically controlled calcification of scleractinian corals, nor as a consequence of calcification from a partly closed volume of fluid. As corals actively transport calcium through several cell layers to the site of calcification, the most likely explanation for the offset is a biologically induced fractionation. Our results indicate a limited use of Ca isotopes in scleractinian corals as temperature proxy.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1016/j.gca.2006.06.1546
ISSN: 0016-7037
Projects: CASIOPEIA
Date Deposited: 16 Feb 2010 12:29
Last Modified: 08 Sep 2017 11:34
URI: http://eprints.uni-kiel.de/id/eprint/3412

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