| Abstract: | One hundred and sixty-four F and Cl analyses of silicic welded tuffs and lavas and glass separates are presented. Comparison of the F and Cl contents of crystallized rocks with those of nonhydrated glass and hydrated glassy rocks from the same rock units shows that most of the halogens originally present were lost on crystallization. An average of about half of the F and four-fifths of the Cl originally present was lost. Analyses of hydrated natural glasses and of glassy rocks indicate that in some cases significant amounts of halogens may be removed from or added to hydrated glass through prolonged contact with ground water. The data show that the original halogen contents of the groundmass of a silicic volcanic rock can be reliably determined only from nonhydrated glass. ?? 1967. |
| Genre: | Article |
| ProdID: | 70010483 |
| Citation Author: | Noble, D. C.; Smith, V. C.; Peck, L. C. |
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| Citation End Page: | 223 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Loss of halogens from crystallized and glassy silicic volcanic rocks; 1967; Article; Journal; Geochimica et Cosmochimica Acta; Noble, D. C.; Smith, V. C.; Peck, L. C. |
| Citation Start Page: | 215 |
| Citation Volume: | 31 |
| Citation Year: | 1967 |
| Type: | citation/reference |
| Text: | Loss of halogens from crystallized and glassy silicic volcanic rocks; 1967; Article; Journal; Geochimica et Cosmochimica Acta; Noble, D. C.; Smith, V. C.; Peck, L. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1967 00:00 -0600 |
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