In situ ion microprobe U-Pb dating and REE abundances of a Carboniferous conodont

Details In situ ion microprobe U-Pb dating and REE abundances of a Carboniferous conodont In situ ion microprobe U-Pb dating and REE abundances of a Carboniferous conodont

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..831s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 5, p. 831-834

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3

Geochemistry, Geochemistry: Geochronology, Geochemistry: Trace Elements, Geochemistry: Instruments And Techniques

Scientific paper

We report here in situ ion microprobe U-Pb dating of a conodont micro-fossil using an ion microprobe method. Thirteen spots on the single fragment of the Carboniferous conodont (size; approximately 800μm×100μm) yield a 238U/206Pb isochron age of 323+/-36Ma and a Tera-Wasserburg concordia intercept age of 332+/-44Ma in a three-dimensional 238U/206Pb-207Pb/206Pb-204Pb/206Pb diagram. These ages are consistent with the depositional and early diagenetic ages of the fossil in its host Mississippian sedimentary sequence within experimental error. The success of the method depends on the chemical fractionation of U from Pb within a hundred-μm length scale and the consequent variations in Pb isotopic compositions due to radioactive decay. Shale-normalized rare earth element (REE) abundances of two spots on the same sample show flat patterns from light REE to middle REE and decreases from middle REE to heavy REE with negative anomalies of both Ce and Eu. The REE characteristics are significantly different from those of Devonian conodonts reported by other workers, suggesting discrepant redox states and/or formation environments.

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