The behaviour of lead isotopes during granulite facies metamorphism

Details The behaviour of lead isotopes during granulite facies metamorphism The behaviour of lead isotopes during granulite facies metamorphism

Sep 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..939g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 36, Issue 9, pp.939-952

Computer Science

12

Scientific paper

The U-Pb decay scheme can give the age of granulite facies metamorphism accompanied by the depletion of U, because of its sensitivity to changes in U/Pb ratio. Model Pb ages, which are generally reliable to within 100 Myr in the period considered, allow the dating of these U-deficient systems. Fractionation-corrected Pb isotopic compositions for central Australian granulites and their separated potassium feldspars were determined. Initial Pb for both rocks and feldspars has a model age which approximates one of two ages given by the Rb-Sr total rock method; the age is that of the granulite facies metamorphism. Isotopic data and bulk analyses demonstrate the depletion of U in all rocks, but in contrast show that Th is erratically depleted. The essentially single-stage nature of the Pb means that premetamorphic fractionation of U from Pb is not detected.

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