J. C. Brannon scite author profile

X-ray absorption spectroscopy and x-ray fluorescence microprobe studies of 35-million-year-old calcite from a Mississippi Valley-type zinc ore deposit indicate substitution of tetravalent uranium for divalent calcium. Thus, tetravalent uranium has a stable location in calcite deposited under reducing conditions. This result validates uranium-series dating methods (including uranium/lead dating) for ancient calcite and shows that calcite provides a sink for uranium in deep groundwater aquifers and anoxic lacustrine and marine basins.

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J. C. Brannon

Correlated study of initial and AlMg isotopic systematics and petrologic properties in a suite of refractory inclusions from the Allende meteorite

Mississippi Valley-type lead–zinc deposits through geological time: implications from recent age-dating research

Tetravalent Uranium in Calcite

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