2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 209-8
Presentation Time: 10:45 AM

A CLUMPED ISOTOPE CALIBRATION FOR LACUSTRINE CARBONATES


MITSUNAGA, Bryce A.1, MERING, John1, PETRYSHYN, Victoria A.1, DUNBAR, Robert2, COHEN, Andrew3, LIU, Xingqi4, KAUFMAN, Darrell S.5, EAGLE, Robert6 and TRIPATI, Aradhna7, (1)Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095, (2)Department of Geological and Environmental Sciences, Stanford Univ, 325 Braun Hall (bldg. 320), Stanford, CA 94305-211, (3)Department of Geosciences, University of Arizona, Tucson, AZ 85721, (4)College of Environmental Resources and Tourism, Capital Normal University, Beijing, 100089, China, (5)School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ 86011, (6)Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Los Angeles, CA 90095, (7)Department of Earth, Planetary, and Space Sciences, Departments of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095

Our capacity to understand Earth’s environmental history is highly dependent on the accuracy of past climate reconstructions. Unfortunately, many terrestrial proxies—tree rings, speleothems, leaf margin analyses, etc.—are influenced by the effects of both temperature and precipitation. Methods that can isolate the effects of temperature alone are needed, and clumped isotope thermometry has the potential to be a useful tool for determining terrestrial climates. Multiple studies have shown that the fraction of 13C—18O bonds in carbonates is inversely related to the temperature at which the rocks formed and may be a useful proxy for reconstructing temperatures on land. An in-depth survey of lacustrine carbonates, however, has not yet been published. Therefore we have been measuring the abundance of 13C18O16O in the CO2 produced by the dissolution of modern lake samples’ carbonate minerals in phosphoric acid and comparing results to independently known estimates of lake water temperature and air temperature. Some of the sample types we have investigated include endogenic carbonates, freshwater gastropods, bivalves, microbialites, and ooids.

Session No. 209

T126. Stable and Clumped Isotope Record of Topography, Climate, and Environments: Challenges and Recent Advances (Posters)
Tuesday, 21 October 2014: 9:00 AM-6:30 PM
Exhibition Hall C (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.519
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