rocks are heated near the surface by a nearby magma chamber
What kinds of pressures (low, medium, or high) and temperatures (low, medium, or high) occur when rocks are heated near the surface by a nearby magma chamber? Why? Would you expect foliated or non-foliated metamorphic rocks to form under such conditions? Why?
The kind of metamorphism associated with the magma chamber is usually a contact metamorphism. When the rocks near to a magma chamber are heated, the temperature will be very high, and the pressure will be medium. This is the formation conditions of contact metamorphic rocks. The temperature is high due to high temperature emanated from the magma chamber, but the pressure will be moderate as heating does not significantly varies the pressure. Pressure change requires a greater volume change, this will not occur in the heating of rocks by a magma chamber.
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