A 40 -K 40 dating of igneous rocks and sediments

Details A 40 -K 40 dating of igneous rocks and sediments A 40 -K 40 dating of igneous rocks and sediments

Sep 1956

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956gecoa..10..153w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 10, Issue 3, pp.153-165

Mathematics

Logic

11

Scientific paper

The discrepancy in A 40 / K 40 ratios between micas and feldspars reported by Wetherill has been confirmed. Assuming no A 40 to be inherited by potassium minerals, a branching ratio of 0.113 is calculated from dated mica samples. This implies that the micas investigated have retained 85% or more of their argon. The branching ratio of R = 0.085 is interpreted to be an empirical calibration constant which corrects for argon loss. The A 40 / K 40 ratios in four authigenic minerals have been determined and the ages are found to be in reasonable agreement with the times assigned to the geologic periods by Holmes.

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