A petrographic study of thermally metamorphosed pelitic rocks in the Burke area, northeastern Vermont

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ID: 297987
1963
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Abstract
High-grade metamorphic rocks in the Burke area include staurolite-, andalusite-staurolite-, sillimanite-andalusite-staurolite-, sillimanite-garnet-staurolite-, sillimanite-garnet-potash feldspar (rare)-, kyanite-sillimanite-staurolite-, and kyanite-sillimanite-andalusite-staurolite-bearing assemblages. These rocks are interpreted as having been formed from low-grade schist and phyllite under load conditions higher than those characterizing normal hornfels aureoles. The various assemblages indicate the metamorphic trends produced as a result of increasing temperature. The one occurrence of a kyanite-sillimanite-andalusite-bearing assemblage suggests that these polymorphs were probably formed under closely similar conditions during thermal metamorphism but not necessarily simultaneously. Change of temperature is easier to envisage than change of pressure during the crystallization of this assemblage. Temperature and pressure conditions must have hovered near to the assumed triple point of the alumino-silicates.
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openalex_W2312677352 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Bertram G. Woodland
Journal american journal of science
Year 1963
DOI
10.2475/ajs.261.4.354
URL
https://ajs.scholasticahq.com/article/58984.pdf
Keywords Keywords not found

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