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Carbonate clumped isotope thermometry of molluscs and its applications to Pleistocene gastropod fossils from South Dakota

Ghosh, P. and Eiler, J. and Petersen, S. (2007) Carbonate clumped isotope thermometry of molluscs and its applications to Pleistocene gastropod fossils from South Dakota. Geochimica et Cosmochimica Acta, 71 (15). A319-A319. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20130723-083334025

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Abstract

Ghosh et al., (2006) [1] present a carbonate clumped isotope palaeo-thermometer. Otolith aragonite from fishes collected over a range of known temperatures [2] validates the original calibration of this thermometer for inorganic calcite precipitate (ICP) and coralline aragonite [1]. Here we present a calibration for molluscs, including gastropods collected from nature and inferred to have grown at widely different temperatures (2-25°C). The growth temperatures for these samples were estimated based on mean annual temperature (MAT) at the site of collection. We speculate that these growth temperature estimates could be biased by unknown and possibly variable amounts to due seasonality of growth and/or other factors. Despite these uncertainties, the mean trend in the relationship between inferred growth temperature and ^(13)C^(18)O^(16)O content of CO_2 extracted from mollusks is indistinguishable from that previously documented for ICP. The proportionality for molluscs can be described between 1 and 25°C by the function: Δ_(47) = 0.0603.10^6•T^(-2) -0.0496, where Δ_(47) is the enrichment, in per mil, of ^(13)C^(18)O^(16)O in CO_2 relative to the amount expected for a stochastic (random) distribution of isotopes among all CO_2 isotopologues [3,4], and T is the temperature in Kelvin. However, due to scatter in these new data, we suggest that the statistically indistinguishable and more precisely known trend for ICP should be used for molluscs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.gca.2007.06.016DOIArticle
http://www.sciencedirect.com/science/article/pii/S0016703707003171PublisherArticle
Additional Information:© 2007 Published by Elsevier Ltd.
Issue or Number:15
Record Number:CaltechAUTHORS:20130723-083334025
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130723-083334025
Official Citation:Goldschmidt Abstracts 2007- G, Geochimica et Cosmochimica Acta, Volume 71, Issue 15, Supplement, August 2007, Pages A302-A366, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2007.06.016.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39512
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Aug 2013 22:03
Last Modified:03 Oct 2019 05:07

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