40Ar-39Ar stepwise degassing experiments on some submarine rocks

Details 40Ar-39Ar stepwise degassing experiments on some submarine rocks 40Ar-39Ar stepwise degassing experiments on some submarine rocks

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20...77o&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 1, p. 77-87.

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40Ar-39Ar stepwise degassing experiments were made on six submarine rocks. The 40Ar-39Ar ages thus obtained were compared with the conventional K-Ar ages. Samples with high K-content generally give a linear correlation on a (40Ar*/36Ar*) - (39Ar*/36Ar*) diagram, showing insignificant excess 40Ar. The excess 40Ar is shown to reside in higher temperature fractions, though the amount is small (< 10-11 mol/g) and becomes significant only for low K-content samples. Basalt drilled from the Experimental Mohole gives a 40Ar-39Ar age of 19 my which agrees with magnetic anomaly lineation isochron. The K-Ar age of 42 my reported for this sample by Kulp is shown to be in error owing to excess 40Ar. The geophysical implications of the 40Ar-39Ar ages of other samples are also discussed.

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