Oxygen isotope fractionation in marine aragonite of coralline sponges.

Böhm, Florian, Joachimski, M. M., Dullo, Wolf-Christian , Eisenhauer, Anton , Lehnert, H., Reitner, J. and Wörheide, G. (2000) Oxygen isotope fractionation in marine aragonite of coralline sponges. Geochimica et Cosmochimica Acta, 64 (10). pp. 1695-1703. DOI 10.1016/S0016-7037(99)00408-1.

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Abstract

Oxygen isotope values of the extant Caribbean coralline sponge Ceratoporella nicholsoni are compared with published temperatures and δ18O of water calculated from salinities. The measured values from aragonitic sponge skeletons have a mean offset of 1.0 ± 0.1‰ from calculated calcite equilibrium values (αaragonite-calcite = 1.0010). This is in good agreement with published values from synthetic aragonite. They further agree with published near-equilibrium oxygen isotope values of temperate and cold water molluscs and foraminifera extrapolated to the temperature range of the coralline sponges. These results and the mode of skeleton formation of Ceratoporella nicholsoni suggest that these sponges precipitate aragonite close to isotopic equilibrium.

The temperature dependence of oxygen isotopic fractionation between the aragonite of Ceratoporella nicholsoni and water is only roughly constrained by the available data, due to the narrow temperature range of the Caribbean reef sites. However, as the data suggest oxygen isotopic equilibrium, we can calculate a well constrained temperature equation combining temperate and cold water equilibrium values from molluscs and foraminifera with our sponge data: Full-size image (<1 K) and Full-size image (<1 K).

Document Type: Article
Keywords: Oxygen isotopes, marine aragonite, coralline sponges
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
Open Access Journal?: No
DOI etc.: 10.1016/S0016-7037(99)00408-1
ISSN: 0016-7037
Date Deposited: 18 Feb 2008 17:24
Last Modified: 25 Aug 2017 08:07
URI: http://oceanrep.geomar.de/id/eprint/4696

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