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Oxygen isotope equilibrium in brachiopod shell fibres in the context of biological control

Published online by Cambridge University Press:  05 July 2018

M. Cusack ,
A. Pérez-Huerta ,
P. Chung ,
D. Parkinson ,
Y. Dauphin  and
J.-P. Cuif
M. Cusack*
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, UK
A. Pérez-Huerta
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, UK
P. Chung
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, UK
D. Parkinson
Affiliation:
Donaldon Associates Ltd., The Pentagon Centre, 36 Washington St, Glasgow, UK
Y. Dauphin
Affiliation:
UMR IDES 8148, Bat 504, Université Paris XI-Orsay, F-91405 Orsay Cedex, France
J.-P. Cuif
Affiliation:
UMR IDES 8148, Bat 504, Université Paris XI-Orsay, F-91405 Orsay Cedex, France
*
*E-mail: [email protected]
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Extract

With their long geological history and stable low-Mg calcite shells, Rhynchonelliform brachiopods are attractive sources of environmental data such as past seawater temperature (Buening and Spero, 1996; Auclair et al., 2003; Brand et al., 2003; Parkinson et al., 2005). Concerns about the influence of vital effects on the stable isotope composition of brachiopod shells (Popp et al., 1986), led to isotope analyses of different parts of brachiopod shells in order to identify those parts of the shell that are influenced by any vital effect and those parts that may be suitable recorders of seawater temperature via stable oxygen isotope composition (Carpenter and Lohmann, 1995; Parkinson et al., 2005). Such detailed studies demonstrated that the outer primary layer of acicularcalcite is isotopically light in both δ18O and δ13C while the secondary layer, composed of calcite fibres, is in oxygen-isotope equilibrium with ambient seawater(Fig. 1) (Parkinson et al., 2005).

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 239 - 242
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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