1. How are metamorphic rocks different from igneous and sedimentary rocks? 2. Wh

Question

1. How are metamorphic rocks different from igneous and sedimentary rocks?

2. What two features characterize most metamorphic rocks?

3. What phenomena can cause metamorphism?

4. Each of the following statements describes one or more characteristics of a particular metamorphic rock. For each statement, identify the metamorphic rock that is being described:

(1) Calcite rich and nonfoliated

(2) Loosely coherent and composed of broken fragments that formed along a fault zone

(3) Represents a grade of metamorphism between slate and schist

(4) Composed of tiny chlorite and mica grains and displays excellent rock cleavage

(5) Foliated and composed predominantly of platy materials

(6) Composed of alternating bands of light and dark silicate minerals

(7) Hard and nonfoliated, often produced by contact metamorphism

5. What is the difference between a porphyroblast and a porphyroclast?

6. What type of metamorphism produces stishovite?

7. What type of metamorphism produces serpentinite?

8. What is the lowest grade metamorphic rock?

9. What is the highest grade metamorphic rock?

10. What is a migmatite?

11. How does mylonite form?

12. What is the protolith of quartzite?

13. What is the protolith of marble?

14. What is a metamorphic aureole?

15. Explain the hazards of metamorphic rocks.

Explanation / Answer

1. metamorphic rocks are secondary rocks derived from pressure and/or temperature acting upon igneous, sedimentary or other metamorphic rocks. igneous rocks form by crystallisation and cooling of lava. sedimentary rocks form by lithification of sediments.

2. most of metamorphic rocks are formed under higher pressure and temperature than at the surface of the earth. most of them are derived from other rocks.

3. metamorphism may be caused by any or all of these factors - temperature, pressure and chemically active fluids.

4.

(1) marble

(2) breccia

(3) phyllite

(4) schist

(5) gneiss

(6) gneiss

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