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 best fit of line is geothermal gradient. The slope of the geothermal gradient is 30 degree celsius/ km. Geothermal gradient is the rate of increase in temperature with depth in the interior of the earth. It varies from place to place. It can range from 25-30 degree celsius/km. The geothermal gradient is elevated in case of volcanic areas. Away from the tectonic plate boundary the geothermal gradient near the surface is 25 degree celsius/km.

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