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Related Experiment Videos

Tetravalent uranium in calcite

Sturchio1, Antonio, Soderholm

  • 1N. C. Sturchio, M. R. Antonio, L. Soderholm, Argonne National Laboratory, Argonne, IL 60439, USA. S. R. Sutton, Consortium for Advanced Radiation Sources and Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)
|August 14, 1998
PubMed
Summary

Tetravalent uranium stably substitutes for calcium in ancient calcite formed in reducing environments. This finding supports uranium-series dating of calcite and highlights its role in sequestering uranium in groundwater and basins.

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Area of Science:

  • Geochemistry
  • Mineralogy
  • Radiometric Dating

Background:

  • Calcite, a common mineral, can incorporate various elements.
  • Uranium-series dating relies on the predictable decay of uranium isotopes.
  • Understanding uranium's behavior in geological formations is crucial for dating accuracy and environmental studies.

Purpose of the Study:

  • To investigate the substitution of uranium in ancient calcite.
  • To determine the stability and valence state of uranium within calcite under specific conditions.
  • To assess the implications for uranium-series dating methods and uranium sequestration.

Main Methods:

  • X-ray absorption spectroscopy (XAS) to determine uranium's chemical state.
  • X-ray fluorescence microprobe (XFM) analysis to map uranium distribution.

Related Experiment Videos

  • Study of 35-million-year-old calcite from a Mississippi Valley-type zinc deposit.

    • Main Results:

    • Evidence of tetravalent uranium (U4+) substituting for divalent calcium (Ca2+) in calcite.
    • Confirmation that tetravalent uranium is stable in calcite formed under reducing conditions.
    • Identification of calcite as a significant sink for uranium in anoxic environments.

    Conclusions:

    • The substitution mechanism validates uranium-series dating (e.g., uranium/lead dating) for ancient calcite.
    • Calcite acts as a natural trap for uranium in deep groundwater, anoxic lacustrine, and marine basins.
    • This research enhances our understanding of geochemical processes and radiometric dating techniques.