The radioactive age of four Western Australian pegmatites by the potassium and rubidium methods

Details The radioactive age of four Western Australian pegmatites by the potassium and rubidium methods The radioactive age of four Western Australian pegmatites by the potassium and rubidium methods

Sep 1956

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956gecoa..10..191j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 10, Issue 3, pp.191-195

Physics

7

Scientific paper

Age determinations using the K-A and Rb-Sr decay schemes have been made on mica and feldspar minerals from several Western Australian pegmatitic intrusions. The results suggest that Rb-Sr and K-A ages determined on micas generally yield consistent ages, although a case of low mica K-A age is reported. The K-A ages of the feldspars measured appear to be considerably lower than their corresponding Rb-Sr ages, but again an exception is noted. It is concluded, using particular values of decay-constants and K branching ratio, that the four pegmatites dated are contemporaneous, with an age of some 2800 million years.

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