USGS

Measurement of bigsymbol13C and bigsymbol18O Isotopic Ratios Of CaCO3 using a Thermoquest Finnigan GasBench II Delta Plus XL Continuous Flow Isotope Ratio Mass Spectrometer with Application to Devils Hole Core DH-11 Calcite

By Kinga M. Revesz, Jurate M. Landwehr, and Jerry Keybl

U.S. Geological Survey, 431 National Center, Reston, VA 20192

U.S. Geological Survey Open-File Report 01-257


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CONTENTS

  Abstract
  Introduction
  Methodology and Equipment
  Testing of Method by Application to Devils Hole Calcite
  Summary
  Acknowledgments
  References Cited

ILLUSTRATIONS

  Figure 1. Schematic of GasBench II and Mass Spectrometer used for this study.
  Figure 2. Precision and accuracy of standard reference materials using GasBench II at 65oC.
  Figure 3. Precision and accuracy of standard reference material using GasBench II at 26oC.
  Figure 4. Stable carbon and oxygen ratio data profiles obtained by the GasBench II method for the re-sampled DH-11 core material compared to original DH-11 analysis by the classical method.
  Figure 5. Stable carbon and oxygen ratio data profiles obtained by the GasBench II method for the re-sampled DH-11 core material, with appropriate sampling depth correction applied, compared to the original DH-11 analysis by the classical method.

APPENDIXES

  Appendix A: Complete Step by Step Procedure
  Appendix B: ISODAT "CACO3" Method
  Appendix C: Data Tabulation


AVAILABILITY

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