The goal of this preliminary investigation was to evaluate fundamental aspects of oxygen and carbon isotopes in Bear Lake sediment to provide background information for future analyses. Specifically, we analyzed δ18O and δ13C to test the minimum sample size required for reliable results on ostracode valves and the benefit of centrifuging sediment to isolate certain density/size fractions. We focused on marl and ostracodes from two cores: (1) a surface core collected in 1998 (hereinafter core 98-09) and (2) core catcher samples from GLAD800 core BL00-1-D (hereinafter core 00-1D). All samples were analyzed on a Finnigan MAT 252 mass spectrometer at the University of Arizona under the guidance of David Dettman. All isotope ratios are reported in standard δ notation, relative to Vienna Peedee belemnite (VPDB).
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Posted August 2005 |
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