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Author Question: What are the three (3 ) types of metamorphism? Where and under what conditions does each ... (Read 28 times)

jon_i

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on: Jul 13, 2018
What are the three (3 ) types of metamorphism? Where and under what conditions does each occur?

Question 2

The Himalayas today can best be described as ____.
 A)volcanically active
 B)seismically active but without active mountain building
 C)a place of mountain building because there is no seismic activity
 D)no longer tectonically active
 E)seismically active with active mountain building


amit

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Reply #1 on: Jul 13, 2018
Answer to Question 1

Contact metamorphism takes place when a body of magma alters the surrounding country rock. At shallow depths, intruding magma raises the temperature of the surrounding rock, causing thermal alteration. Furthermore, the release of hot fluids into the country rock by the cooling intrusion can aid in the formation of new minerals.

Dynamic metamorphism is associated with faults or fault zones, where rocks are subjected to high levels of differential pressure. The metamorphic rocks that result from pure
dynamic metamorphism are typically restricted to narrow zones adjacent to faults.

Regional metamorphism is responsible for the formation of most metamorphic rocks. It occurs over a large area and is usually caused by tremendous temperatures, pressures, and deformations all occurring together within the deeper portions of the crust. Regional metamorphism is most obvious along convergent plate boundaries where rocks are intensely deformed and recrystallized during convergence and subduction.

Answer to Question 2

E


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