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GSA Annual Meeting in Indianapolis, Indiana, USA - 2018

Paper No. 37-1
Presentation Time: 9:00 AM-5:30 PM

CLUMPED ISOTOPE SYSTEMATICS IN LACUSTRINE AND FLUVIAL CARBONATES: A TOOL FOR PALEOCLIMATE, PALEOHYDROLOGY, AND PALEOALTIMETRY


ARNOLD, Alexandrea J., Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095, MERING, John, Department of Earth Sciences, University of Waikato, Hamilton, 3240, New Zealand, SANTI, Lauren, Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Los Angeles, CA 90095, PETRYSHYN, Victoria, Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, MITSUNAGA, Bryce A., Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, 595 Charles E. Young Dr. East, Los Angeles, CA 90095, WILSON, John, Department of Geological Sciences, California State University, Bakersfield, 9001 Stockdale Hwy, Bakersfield, CA 93311, IBARRA, Daniel E., Stanford University, 473 Via Ortega, Rm 140, Stanford, CA 94305, KAUFMAN, Darrell, Department of Geology, Northern Arizona University, Flagstaff, AZ 86011-4099, COHEN, Andrew, Department of Geosciences, University of Arizona, Tucson, AZ 85721, DUNBAR, Robert, Department of Geological and Environmental Sciences, Stanford Univ, 325 Braun Hall (bldg. 320), Stanford, CA 94305-211, RUSSELL, James M., Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, LALONDE, Stefan, CNRS-UMR6538 Domaines Océaniques, European Institute for Marine Studies, Plouzane, 29280, France, OVIATT, Charles G., Department of Geology, Kansas State University, Manhattan, KS 66506, ROY, Priyadarsi D., Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, 04510, Mexico, EAGLE, Robert, Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095 and TRIPATI, Aradhna, 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 reconstructions of past climates. Lacustrine and riverine sediments provide important archives of terrestrial climate change, and represent an important tool for reconstructing paleoclimate, paleohydrology, and paleoaltimetry. Carbonate clumped isotope thermometry in particular presents a valuable opportunity to reconstruct past climates, using the abundance of 13C—18O bonds in carbonate sediments. Previous studies of synthetic carbonates have consistently found that cold formation temperatures are associated with a greater “clumping” of heavy 13C—18O bonds, and a limited amount of data for modern lake carbonates supports these findings. Here we present an extensive calibration dataset comprised of 111 analyses of 34 modern freshwater samples, including microbialites, tufas, micrites, endogenic carbonates, freshwater gastropods, bivalves, and ooids. To create this dataset, measurements of 13C18O16O were made on CO2 produced by the dissolution of carbonate minerals in phosphoric acid, and these results are compared to independently known estimates of water temperature. The utility of this study is that it provides a foundation for the intercomparison and calibration of carbonate clumped isotope results from modern rivers and lakes, and also shows how we can best approach paleoenvironmental reconstructions using freshwater archives. We evaluate the use of a common calibration and material-specific calibrations, and find that material-specific calibrations may be most appropriate for such systems, with slopes ranging from 0.376 to 0.575 and intercepts ranging from 0.04346 to 0.2571. We also show that of existing synthetic calibrations, if a single slope calibration is used for all data, Tang et al. (2014) and Kelson et al. (2015) yields the most accurate results. This work constrains the relationship between independent estimates of water temperature and clumped isotope-derived temperatures (Δ47) in modern lake carbonates, which has implications for paleoclimate studies on natural carbonate sediments.

Session No. 37--Booth# 215

T118. Paleoenvironmental Reconstructions from Biogenic Carbonates (Posters)
Sunday, 4 November 2018: 9:00 AM-5:30 PM
Halls J-K (Indiana Convention Center)
Geological Society of America Abstracts with Programs. Vol. 50, No. 6
doi: 10.1130/abs/2018AM-325115
© Copyright 2018 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.
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