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Carbonate clumped isotope thermometry of deep-sea corals and implications for vital effects

Thiagarajan, Nivedita and Adkins, Jess and Eiler, John (2011) Carbonate clumped isotope thermometry of deep-sea corals and implications for vital effects. Geochimica et Cosmochimica Acta, 75 (16). pp. 4416-4425. ISSN 0016-7037.

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Here we calibrate the carbonate clumped isotope thermometer in modern deep-sea corals. We examined 11 specimens of three species of deep-sea corals and one species of a surface coral spanning a total range in growth temperature of 2–25 °C. External standard errors for individual measurements ranged from 0.005‰ to 0.011‰ (average: 0.0074‰) which corresponds to ~1-2 °C. External standard errors for replicate measurements of Δ_47 in corals ranged from 0.002‰ to 0.014‰ (average: 0.0072‰) which corresponds to 0.4–2.8 °C. We find that skeletal carbonate from deep-sea corals shows the same relationship of Δ47 (the measure of ^(13)C–^(18)O ordering) to temperature as does inorganic calcite. In contrast, the δ^(13) C and δ^(18)O values of these carbonates (measured simultaneously with Δ_47 for every sample) differ markedly from equilibrium with seawater; i.e., these samples exhibit pronounced ‘vital effects’ in their bulk isotopic compositions. We explore several reasons why the clumped isotope compositions of deep-sea coral skeletons exhibit no evidence of a vital effect despite having large conventional isotopic vital effects.

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Adkins, Jess0000-0002-3174-5190
Additional Information:© 2011 Elsevier Ltd. Received 1 March 2010; accepted in revised form 4 April 2011; available online 17 May 2011. We would like to thank Weifu Guo and Alexander Gagnon for helpful conversations. We would also like to thank Rinat Gabitov and two anonymous reviewers for their comments. We also thank The National Museum of Natural History for lending us deep-sea coral samples.
Issue or Number:16
Record Number:CaltechAUTHORS:20110824-141241026
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Official Citation:Nivedita Thiagarajan, Jess Adkins, John Eiler, Carbonate clumped isotope thermometry of deep-sea corals and implications for vital effects, Geochimica et Cosmochimica Acta, Volume 75, Issue 16, 15 August 2011, Pages 4416-4425, ISSN 0016-7037, DOI: 10.1016/j.gca.2011.05.004.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25081
Deposited By: Jason Perez
Deposited On:24 Aug 2011 23:03
Last Modified:24 Feb 2020 10:30

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