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Unformatted text preview: ht and dark minerals What are metamorphic textures?
What are metamorphic textures? Texture refers to the size, shape, and
arrangement of mineral grains within a rock
arrangement Foliation – planar arrangement of mineral
grains within a rock, perpendicular to the
directed Common near convergent margins Outcrop of foliated gneiss Metamorphic textures
Metamorphic textures Foliation Foliation can form in various ways:
– Rotation of platy or elongated minerals
– Recrystallization of minerals in a
– Changing the shape of equidimensional
grains into elongated and aligned shapes
grains Development of foliation due to directed pressure Migmatites When Partial Melting Starts
Heat the rock, when the minerals with the lowest melting points (Qtz, Feldspar) at that pressure melt then recrystallize, we get separate bands of Metamorphic and Igneous rock...
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This document was uploaded on 01/26/2014.
- Winter '14