Fluorine iron biotite from the Honeycomb Hills rhyolite, Utah; the halogen record of decompression in a silicic magma

This paper describes the occurrence and chemical composition of unusual Fe-rich micas whose F and Cl contents record changes in the ratio of H2O to halogens in a silicic magma during an eruptive cycle.

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Bibliographische Detailangaben
Veröffentlicht in:	The American mineralogist 1993-10, Vol.78 (9-10), p.1031-1040
1. Verfasser:	Nash, W. P
Format:	Artikel
Sprache:	eng
Schlagworte:	biotite Chlorine fluorides Fluorine halides Halogens Hills Honeycomb Hills igneous and metamorphic rocks igneous rocks Iron Lava Magma mica group Minerals nesosilicates orthosilicates Petrology rhyolites sheet silicates silicates topaz United States Utah volcanic rocks west-central Utah
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Beschreibung
Zusammenfassung:	This paper describes the occurrence and chemical composition of unusual Fe-rich micas whose F and Cl contents record changes in the ratio of H2O to halogens in a silicic magma during an eruptive cycle.
ISSN:	0003-004X 1945-3027