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An occurrence of metastable cristobalite in high-pressure garnet Granulite

Science

By:
, ,
DOI: 10.1126/science.276.5309.91

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Abstract

High-pressure (0.8 gigapascals) granulite facies garnet from Gore Mountain, New York, hosts multiple solid inclusions containing the low- pressure silica polymorph cristobalite along with albite and minor ilmenite. Identification of cristobalite is based on Raman spectra, electron microprobe analysis, and microthermometric measurements on the ??/?? phase transformation. The cristobalite plus albite inclusions may have originated as small, trapped samples of hydrous sodium-aluminum-siliceous melt. Diffusive loss of water from these inclusions under isothermal, isochoric conditions may have resulted in a large enough internal pressure decrease to promote the metastable crystallization of cristobalite.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
An occurrence of metastable cristobalite in high-pressure garnet Granulite
Series title:
Science
DOI:
10.1126/science.276.5309.91
Volume
276
Issue:
5309
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
91
Last page:
93
Number of Pages:
3