Introduction to Geology

Introduction to Geology

Quiz 10 - Metamorphism and Metamorphic Rocks

1. Which of these is an agent metamorphism?
a. pressure.
b. heat.
c. chemically active fluids.
d. all of the above.

2. What mineral is a common form of asbestos that was was widely used in industry as insolation before being banned out of health concerns?
a. talc
c. epidote
d. crysolite

3. Listed in order of increasing metamorphic grade, a shale could be metamorphosed into:
a. gneiss-phyllite-slate-schist
b. slate-schist-gneiss-phyllite
c. slate-phyllite-schist-gneiss
d. schist-phyllite-slate-gneiss

4. The parent rock of a marble is:
a. granite
b. limestone
c. slate
d. sandstone
e. shale

5. A metamorphic rock that forms in under the crushing and shearing pressure in fault zones is:
a. marble.
b. conglomerate.
c. serpentinite.
d. mylonite.
e. quartzite.

6. Where does metamorphism take place?
a. only at depth below the surface.
b. where a rock is subjected to physical and chemical conditions unlike those in which it originally formed.
c. only at the surface.
d. only in the Earth's core.
e. only in young sediments.

7. The force exerted on a buried rock by the weight of material above it is called:
a. shear stress.
b. tensional stress.
c. geothermal gradient.
d. compressional stress.
e. confining pressure.

8. Where does most regional metamorphism occur?
a. in areas of active mountain building
b. on the seafloor
c. in the lower mantle
d. around volcanoes
e. around magmatic intrusions

9. What is a skarn?
a. A scarn is a zone of contact metamorphism formed along margins of an igneous intrustion.
b. A scarn is a form of hydrothermal metamorphism associated with hot springs.
c. A scarn is a form of regional metamorphism beneath a large mountain range.
d. A scarn is a form of dynamic metamorphism caused by an asteroid impact.

10. What kind of metamorphism involves mineralogical changes that take place when rocks formed at great depths migrate to the surface via tectonic uplift and are exposed to lower pressure and more fluid-rich geologic settings?
a. contact metamorphism
b. regional metamorphism
c. dynamic metamorphism
d. retrograde metamorphism

11. What kind of metamorphic facies are associated with a cold slab of ocean crust sinking deep into a subduction zone where high pressure and low temperature conditions persist?
a. greenschist facies
b. blueschist facies
c. granulite facies
d. ecologite facies

12. When subject to directed pressure, metamorphosed rocks show a layered or banded texture is called:
a. facies.
b. slate.
c. mylonite.
d. foliation.

13. When a granite is subjected to direct pressure, its minerals re-align themselves to adjust to the pressure, forming:
a. slate.
b. gneiss.
c. amphibolite.
d. quartzite.
e. marble.

14. What is a migmatite?
a. a metamorphic rock that forms from sandstone.
b. a type of meteorite that has undergone metamorphism.
c. a rock that has been metamorphosed to such high degrees that is has partially melted.
d. a low-grade metamorphic rock containing garnet.

15. What non-foliated rock forms from the metamorphism of limestone or dolomite?
a. slate
b. marble
c. schist
d. quartzite

16. Massive amounts of plant remains can accumulate in a swamp setting and then become buried. As this material undergoes increasing heat and pressure over time, this organic matter will go through stages in what order?
a. peat—lignite—bitumenous coal—anthracite coal
b. lignite—peat—anthracite coal—bituminous coal
c. peat—lignite—oil—natural gas
d. all of the above.

Clues where to find answers.