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Author Question: Explain how migmatites form. Why are they difficult to fit into any of the three basic rock types? ... (Read 12 times)

karen

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on: Jul 16, 2018
Explain how migmatites form. Why are they difficult to fit into any of the three basic rock types?
 
  What will be an ideal response?

Question 2

How can a meteorite impact metamorphose a rock? What temperature/pressure conditions will be present?
 
  What will be an ideal response?


jaymee143

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Answer: Gneissic rocks undergo partial melting, which melts quartz and feldspar crystals and leaves biotite and amphibole behind. When the rock cools, light bands in the rock will be composed of igneous materials, and dark bands will consist of unmelted metamorphic material. They are not easily placed in any of the three rock groups because they represent a transitional stage, containing both igneous crystals and metamorphic crystals.

Answer to Question 2

Answer: A large, fast-moving body such as a meteorite will impact the Earth at a high velocity, quickly creating a high-pressure, high-temperature environment. The energy of the impact will be transformed into heat energy and shock waves, pulverizing and melting the rock.


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