ES2 Metamorphic Rocks - Metamorphic Microstructures #21
Rotated porphyroblast (pre-kinematic).
The yellow poikiloblast of staurolite in the centre of the field of view occupies a lenticular domain which the matrix foliation wraps around. The internal fabric in the staurolite is sharply discordant to that in the matrix. The poikiloblast grew before the deformation which formed the matrix foliation.
Plane-polarised light. Field of view is 2.5 mm across.
Garnet-staurolite schist, Betic Cordillera, southern Spain.
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DJW - August 1997