An occurrence of metastable cristobalite in high-pressure garnet Granulite
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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.
| 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 |
| Larger Work Title | Science |
| First page | 91 |
| Last page | 93 |
| Google Analytic Metrics | Metrics page |