An occurrence of metastable cristobalite in high-pressure garnet Granulite

Science

Volumn 276, Issue 5309, 1997, Pages 91-93

  Darling, Robert S ^a   Chou, I Ming ^b   Bodnar, Robert J ^c  

^a STATE UNIVERSITY OF NEW YORK   (United States)

^b U S GEOLOGICAL SURVEY   (United States)

^c VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

SILICON DIOXIDE;

ARTICLE; CHEMICAL ANALYSIS; CRYSTAL; ELECTRON MICROSCOPY; GEOLOGY; PRIORITY JOURNAL; RAMAN SPECTROMETRY;

CRISTOBALITE; GARNET; GRANULITE FACIES; METAMORPHIC MINERAL; METASTABLE CRYSTALLIZATION;

USA, NEW YORK, GORE MOUNTAIN;

EID: 0030919796     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.276.5309.91     Document Type: Article

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29. Unlike these occurrences of coesite, we did not observe marginal-or fracture-related replacement of cristobalite by α-quartz. The reason for this is unknown, but the two polymorphs did experience very different retrograde PT paths, which will affect the availability and diffusivity of water, as well as the compressibility and expansivity of the host and inclusion phases.
30. We thank D. Lindsley, F. Florence, and H. Nekvasil for help with this investigation, J. Ireland for technical assistance, B. Gravait and J. Hunt for assistance in scanning electron microscopy and electron microprobe analysis, and P. Dunn and J. Post of the Smithsonian Institution for providing natural cristobalite for Raman analysis. Suggestions by P. Barton, G. Nord, and two anonymous reviewers greatly improved earlier versions of this manuscript.