Physics
Scientific paper
Jun 1955
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955gecoa...7..294a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 7, Issue 5-6, pp.294-300
Physics
6
Scientific paper
The lead-age distribution ( , , and ) of three specimens of Rhodesian monazite form a regular pattern. Such an array, produced evidently by varying lead loss * , may be used for a precision estimate of age--the convergent age. The convergent age of each Rhodesian monazite is estimated at 2,680 × 10 6 years. The lead-age distributions of monazite from Anteirabe, Madagascar, and uraninite from the Huron Claim, south-eastern Manitoba, fit an extension of Rhodesian age pattern closely (±20 × 10 6 years) and hence their convergent ages are estimated also at 2,680 × 10 6 years; uraninite from Klerksdorp, Transvaal, may have a similar age. The convergent ages of those most primitive specimens are somewhat greater (50-700 × 10 6 years) than previously recommended estimates. The formation of a well-ordered age array suggests that physical causes, rather than chemical, have controlled lead loss.
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