Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique

Details Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..40..107c&link_type=abstract

Earth and Planetary Science Letters, Volume 40, Issue 1, p. 107-110.

Computer Science

1

Scientific paper

K-Ar ages have been determined for sulfide minerals for the first time. The occurrence of adequate amounts of potassium-bearing sulfides with ideal compositions K3Fe10S14 (~10 wt.% K) and KFe2S3 (~16 wt.% K) in samples from a mafic alkalic diatreme at Coyote Peak, California, prompted an attempt to date these materials. K3Fe10S14, a massive mineral with conchoidal fracture, gives an age of 29.4 +/- 0.5 m.y. (40Ar/39Ar), indistinguishable from the 28.3 +/- 0.4 m.y. (40Ar/39Ar) and 30.2 +/- 1.0 m.y.8 (conventional K-Ar) ages obtained for associated phlogopite (8.7 wt.% K). KFe2S3, a bladed, fibrous sulfide, gives a younger age, 26.5 +/- 0.5 m.y. (40Ar/39Ar), presumably owing to Ar loss.

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