| 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 ?? 0.5 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. ?? 1978. |
| Genre: | Article |
| ProdID: | 70012420 |
| Citation Author: | Czamanske, G. K.; Lanphere, M. A.; Erd, R. C.; Blake, Jr. , M. C. |
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| Citation End Page: | 110 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique; 1978; Article; Journal; Earth and Planetary Science Letters; Czamanske, G. K.; Lanphere, M. A.; Erd, R. C.; Blake, Jr. , M. C. |
| Citation Start Page: | 107 |
| Citation Volume: | 40 |
| Citation Year: | 1978 |
| Type: | citation/reference |
| Text: | Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique; 1978; Article; Journal; Earth and Planetary Science Letters; Czamanske, G. K.; Lanphere, M. A.; Erd, R. C.; Blake, Jr. , M. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1978 00:00 -0600 |
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