| Reference Type | Journal (article/letter/editorial) |
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| Title | Metamorphic differentiation; a mechanism indicated by zoned kyanite crystals in some rocks from the Lukmanier region, Switzerland |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Bramwell, M. G. | Author |
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| Year | 1985 (March) | Volume | 49 |
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| Issue | 350 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_49/49-350-59.pdf+ |
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| DOI | doi:10.1180/minmag.1985.049.350.07Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3696 | Long-form Identifier | mindat:1:5:3696:6 |
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| GUID | 0 |
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| Full Reference | Bramwell, M. G. (1985) Metamorphic differentiation; a mechanism indicated by zoned kyanite crystals in some rocks from the Lukmanier region, Switzerland. Mineralogical Magazine, 49 (350) 59-64 doi:10.1180/minmag.1985.049.350.07 |
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| Plain Text | Bramwell, M. G. (1985) Metamorphic differentiation; a mechanism indicated by zoned kyanite crystals in some rocks from the Lukmanier region, Switzerland. Mineralogical Magazine, 49 (350) 59-64 doi:10.1180/minmag.1985.049.350.07 |
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| In | (1985, March) Mineralogical Magazine Vol. 49 (350) Mineralogical Society |
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| Abstract/Notes | AbstractTwo samples of garnet-kyanite-staurolite schist from Lukmanier, Switzerland, each contain two chemical varieties of kyanite which occur in texturally distinct areas of the rock. Type 1 form large idiomorphic crystals within an open crenulation cleavage S3. They exhibit a systematic zonation of F2O3, with core values of 0.8% decreasing to 0.3% at the crystal margin. Type 2 form small, much less abundant crystals in areas between S3 cleavage zones, and have a homogeneous distribution of 0.3% Fe2O3 throughout the crystal.It is suggested that the first-nucleated crystals contain the highest core concentration of Fe2O3 and are the largest. A positive correlation between core Fe2O3 values and crystal size is interpreted as a nucleation and growth sequence. This indicates that the first crystals formed preferentially in S3 (Type 1), with Type 2 crystals growing later outside the S3 zones.Concentration of kyanite in S3 zones produces a distinct mineral banding in the rock. A mechanism for the development of metamorphic differentiation by preferred nucleation of kyanite in S3 is proposed. |
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