Loss of halogens from crystallized and glassy silicic volcanic rocks

Geochimica et Cosmochimica Acta
By: , and 


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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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Loss of halogens from crystallized and glassy silicic volcanic rocks
Series title Geochimica et Cosmochimica Acta
Volume 31
Issue 2
Year Published 1967
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geochimica et Cosmochimica Acta
First page 215
Last page 223