Quaternary geochronology using the U-Th-Pb method

Details Quaternary geochronology using the U-Th-Pb method Quaternary geochronology using the U-Th-Pb method

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3267g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 15, pp.3267-3272

Physics

2

Scientific paper

We describe a method of uranium-thorium-lead (U-Th-Pb) isotopic age dating for Quaternary rocks. The approach uses an instrumental mass discrimination correction for lead isotope ratios, which allows small enrichments of radiogenic 206 Pb and 208 Pb to be detected at the level of 0.001%. Igneous rocks hosting minerals with a range in values of 100 can be dated with uncertainties of approximately ± 15-20 kyr. A Quaternary rhyolite dated at 1.19 Ma by K-Ar yields a 238 U- 206 Pb age of 1.03 ± 0.10 Ma. A Holocene dacite (9.5 ka) has uniform to within ±0.0015% in groundmass phases, but 1 mm plagioclase phenocrysts have lower by 0.105 ± 0.002% indicating contamination of the magma after plagioclase crystallization. High precision ratios may be a useful new tool for petrogenetic studies.

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