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Publication Type
Conference Proceedings
UWI Author(s)
Author, Analytic
Gunter, Gavin C.; Marshall, James D.; Mitchell, Simon F.
Author Role
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Author Affiliation
Department of Geography and Geology
Paper/Section Title
Palaeotemperature estimates for the Upper Cretaceous (Late Maastrichtian) of Jamaica [Abstract]
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Proceedings Title
Proceedings of the Sixth Conference, Faculty of Pure and Applied Sciences edited by Daniel Coore and Robert J.Lancashire.
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Place of Meeting
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Place of Publication
Kingston, Jamaica
Publisher Name
Faculty of Pure and Applied Sciences, University of the West Indies
Date of Publication
2003
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Volume ID
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Location in Work
36
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Abstract
During the Cretaceous period, Jamaica was an emergent member of an island arc system similar to the one developed today along the eastern Caribbean margin. The surrounding shallow seas were inhabited by a varies macrofauna; chief among this was and aberrant group of bivalves known as rudists. Oxygen isotope ratios from marine biogenic calcite have been used extensively to estimate ancient water temperatures on the assumption that organisms precipitate their shell in isotopic equilibrium with seawater. However, biogenic fractionation (or the so-called 'vital effect' known to occur in several taxa. Stable isotope analysis (O and C) of fossil oyesters, brachiopods and rudists from the latest Cretaceous of Jamaica has been conducted to test the reliability of using these taxa in palaeotemperature reconstruction. An assessment of he preservation of representative shell material eas made via trace element geochemistry, cathodoluminescence and Scanning Electron Microscope techniques. The results reveal a significant difference between the isotopic ratios perserved in oyesters and rudists and that of the brachiopods. The implications for the utility of these taxa in palaeotemperature reconstruction are discussed.....
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