|2007 GSA Denver Annual Meeting (28–31 October 2007)|
|Paper No. 154-4|
|Presentation Time: 2:15 PM-2:30 PM|
MODERN ELEMENTAL AND ISOTOPIC CHEMISTRY OF ECHINODERM SKELETAL CARBONATE
HASIUK, Franciszek Józef and LOHMANN, Kyger C., Department of Geological Sciences, University of Michigan, 2534 CC Little Bldg, 1100 N University Ave, Ann Arbor, MI 48109, firstname.lastname@example.org|
Fossil echinoderms have recently been suggested by Dickson to record oscillations in the oceanic Mg/Ca ratio through the Phanerozoic. Such a supposition, however, must be based on a firm understanding of the skeletal chemistry of modern echinoderms as well as the changes such material would undergo during diagenesis. While datasets have been generated to characterize the chemistry of modern echinoderm skeletal material (e.g. those of Clark and Wheeler, Vinogradov, Chave, Weber), the lack of paired stable isotope and elemental analyses on splits of identical material has hampered their application to diagenetic studies of fossil echinoderms. In this study we extend the utility of these literature datasets by reviewing and interpreting them within the context of new coupled elemental (Mg/Ca, Sr/Ca, Fe/Ca, Mn/Ca) and isotopic (δ13C, δ18O) data from the skeletal carbonate of modern crinoids.
Since echinoderm skeletal material has a high proportion of occluded organic matter (~50%), methods for cleaning echinoderm skeletal carbonate were also investigated. It was found that the chemistry of ossicles cleaned with NaOCl, H2O2, or enzymatic cleaner were identical to the control (no cleaning method applied) with the exception that in the case of the enzymatic cleaner δ13C was more positive by ~ 1‰.
2007 GSA Denver Annual Meeting (28–31 October 2007)
General Information for this Meeting
|Session No. 154|
Colorado Convention Center: 501
1:30 PM-5:30 PM, Tuesday, 30 October 2007
Geological Society of America Abstracts with Programs, Vol. 39, No. 6, p. 419
© Copyright 2007 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.