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

The grade of metamorphism increases in all directions toward the intrusion. Because the temperature contrast between the surrounding rock and the intruded magma is larger at shallow levels in the crust where pressure is low, contactmetamorphism is often referred to as high temperature, low pressuremetamorphism.

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