Journal article
Forward modeling of metamorphic textures
Canadian mineralogist, Vol.37(2), pp.415-429
04/1999
Abstract
A technique of quantitative forward modelling that combines differential and irreversible thermodynamic relations is used to gain insight into the types of textures that develop in regional metamorphic terrains. Two different P-T paths are examined that give sillimanite-garnet schist from staurolite-garnet schist of the same bulk composition: one is an isobaric heating path from 600 to 630 degrees C at 4 kbar, and the other is an isothermal decompression path from 8 to 4 kbar at 630 degrees C. The final, T, P, mineral compositions and whole-rock mineral modes are the same in the two cases, but the mineral textures are different, allowing the two paths to be distinguished. The textures indicate that the higher-P rock originally had more garnet and less staurolite than the lower-P rock; there is also a difference in the reactions that produced sillimanite, in the isobaric case most sillimanite is produced from the breakdown of staurolite, whereas in the isothermal decompression case it came from garnet. Integration of this technique with regional studies of metamorphic textures has the potential to provide significant constraints on the detailed thermal history of mountain belts.
Details
- Title: Subtitle
- Forward modeling of metamorphic textures
- Creators
- C. T Foster - University of Iowa
- Contributors
- T Rivers (Editor)D. R. M Pattison (Editor)R. F Martin (Editor)
- Resource Type
- Journal article
- Publication Details
- Canadian mineralogist, Vol.37(2), pp.415-429
- Publisher
- Mineralogical Association of Canada
- ISSN
- 0008-4476
- eISSN
- 1499-1276
- Alternative title
- Mineral-scale processes in metamorphic petrology; the Kretz volume
- Language
- English; French
- Date published
- 04/1999
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984229295302771
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