10 kyanite sillimanite andalusite 5 20 10 0 500 Temperature (C) 1000 Low Grade I

Question

10 kyanite sillimanite andalusite 5 20 10 0 500 Temperature (C) 1000 Low Grade Intermediate Grade High Grade Grade of Metamorphism Increasing Metamorphis chlorite biotite Mineral Composition arnet staurolite sillimanite muscovite quartz plagioclase & orthoclase 0°C 500 C 1000°C Rock Type Figure 2. (a) At top- Pressure-temperature-depth (P-T-depth) diagram illustrating the mineral stability fields for minerals typical of those formed during metamorphism of shale (b) At bottom - mineral and rock fabric changes that occur during the progressive metamorphism of shale. Note - a color version is on line at the web link for this exercise.

Explanation / Answer

And

1 (d) a gneiss with minerals assemblage kynite, sillimanite, kynite,mouscovite, quartz,plageoclase

2 (c) a gneiss with sillimanite, quartz,plageoclage that occurs together with thin vein of granite

3 (e) a phyllite with clorite,biotite,muscovite, quartz,orthoclase

4 (a) a schist with biotite,garnet,Muscovite, quartz, plageoclase

5 (b) a schist with finely grained Muscovite,garnet,staurolite,quartz with large porphyroblast composed of andulusite.

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