Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique
Earth and Planetary Science Letters
By: G.K. Czamanske, M. A. Lanphere, Richard C. Erd, and M. C. Blake Jr.
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Abstract
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 ± 0.5m.y.(40Ar/39Ar), indistinguishable from the 28.3 ± 0.4m.y.(40Ar/39Ar) and 30.2 ± 1.0m.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 ± 0.5m.y.(40Ar/39Ar), presumably owing to Ar loss.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(78)90079-1 |
| Volume | 40 |
| Issue | 1 |
| Year Published | 1978 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | 4 p. |
| First page | 107 |
| Last page | 110 |