Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/25064
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Relationship between δ18O and minor element composition of Terebratalia transversa
Authors: Cusack, Maggie
Parkinson, David
Pérez-Huerta, Alberto
England, Jennifer
Curry, Gordon B
Fallick, Anthony E
Contact Email: maggie.cusack@stir.ac.uk
Keywords: Brachiopods
calcite
magnesium
oxygen isotopes
sulphur
vital effect
Issue Date: Sep-2007
Citation: Cusack M, Parkinson D, Pérez-Huerta A, England J, Curry GB & Fallick AE (2007) Relationship between δ18O and minor element composition of Terebratalia transversa, Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 98 (3-4), pp. 443-449.
Abstract: With their extensive fossil record and shells of stable low-Mg calcite, rhynchonelliform brachiopods are attractive sources of climate information via seawater temperature proxies such as stable oxygen isotope composition. In Terebratalia transversa (Sowerby) there is a progression towards oxygen isotope equilibrium in the calcite of the innermost secondary layer. This study confirms the lack of any vital effects influencing oxygen isotope composition of T. transversa, even in specialised areas of the innermost secondary layer. Calcite Mg/Ca ratio is another potential seawater temperature proxy, that has the advantage of not being influenced by salinity. Mg concentrations measured by electron microprobe analyses indicate that there is no concomitant decrease in Mg concentration towards the inner secondary layer, associated with the progressive shift towards oxygen isotope equilibrium. Mg distribution is heterogeneous throughout the shell and correlates with that of sulphur, which may be a proxy for organic components, suggesting that some of the Mg may not be in the calcite lattice. It is essential therefore, to determine the chemical environment of the magnesium ions to avoid any erroneous temperature extrapolations in brachiopods or any other calcite biomineral. 
DOI Link: http://dx.doi.org/10.1017/S1755691008075671
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