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Directly dating geologic events: U-Pb dating of carbonates
Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York, USA
Lamont-Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA
Carbonates are ubiquitous, forming in a variety of settings including caves, soils, the oceans, during burial from hydrothermal fluids, and along faults. U-Pb dating of carbonates is applicable to almost the entire geologic time scale, with results from Pleistocene speleothems showing great promise for dating records <1 Ma old. Here we review studies of U-Pb dating of carbonates from a range of depositional and diagenetic environments and consider published results with regard to stratigraphic associations and the behavior of U and Pb in various fluids. We detail the steps required to select suitable samples, summarize current laboratory techniques, and provide directions for improvement of analytical protocols. The U-Pb dating of carbonates has tremendous potential for dating events of geologic interest and is virtually untapped.
Received 19 September 2007; accepted 28 January 2009; published 10 July 2009.
Citation: (2009), Directly dating geologic events: U-Pb dating of carbonates, Rev. Geophys., 47, RG3001, doi:10.1029/2007RG000246.
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