A 40 -K 40 dating

Details A 40 -K 40 dating A 40 -K 40 dating

Feb 1955

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955gecoa...7...51w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 7, Issue 1-2, pp.51-60

Physics

10

Scientific paper

The A 40 /K 40 ratios and the Pb-U ages of various co-existing potassium feldspars and uraninites were determined. It was found that with a branching ratio and a decay constant = 0.55 × 10 -9 / yr , the A 40 /K 40 ages could be brought into agreement with the Pb-U ages for samples ranging from 260 to 1860 m.y. Ko evidence was found for the loss of argon by diffusion from potassium feldspars.

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