Staurolite at anomalously high grade |
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| Authors: | J R Ashworth |
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| Institution: | (1) Department of Physics, University of Essex, Wivenhoe Park, Colchester, England |
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| Abstract: | In the Huntly — Portsoy area, north-east Scotland, staurolite occurs in muscovite-free migmatized semipelites. This occurrence in the Sillimanite-potash feldspar Zone is petrographically distinct from lower-grade staurolite found nearby. Petrographic and chemical data indicate that the staurolite formed stably during the migmatization episode. It was stabilized by high zinc-content. Its formation was probably an early retrograde effect. |
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