Quiz #10 Part 2

19 September 2011

S.I. Session 10 Quiz #2

This quiz covers material from the lecture on Monday, September 19^th.

Part a) Match the term to its definition:

                TERMS:

a)Porphyroblasts             b)Garnet                                             c) Foliations

d)Gneiss                              e)Shock Metamorphism                               f)Contact Metamorphism

g)Granoblastic                   h)Blueschist                                       i) Exhumation

                DEFINITIONS:

1)__ This is typically caused by a meteor impact and it usually leaves a visible pattern in the minerals.

2)__ These are bands of minerals and oriented perpendicular or at some angle to the bedding planes.

3)__ This type of rock does not have foliations since they form without directed pressure.

4)__ These rocks are associated with subduction zones and are formed as the result of high pressure and low temperature.

5) __This rock acts as a pressure/temperature recording device. The oldest part of the crystal is at the center, and the youngest part of the crystal is at the outer edge.

6)__ In this process, a rock is carried towards the earth’s surface.

7)__These are stable minerals growing in a recrystallizing matrix (a good example is a garnet crystal growing in a schist matrix).

8)__This occurs when magma heats up the surrounding rock to the point where the mineral composition of the rock changes, but the rock does not melt.

9)__ This metamorphic rock has characteristic light and dark bands of minerals.

Part b) Put the following metamorphic rocks in order from highest grade to lowest grade of metamorphism:

1)      Slate                              4)Phyllite

2)      Migmatite                   5)Gneiss

3)      Schist

Part c) True or False:

                Mark T (true) or F (false) in the blank provided:

1)__Pure marble has foliations.

2)__Metamorphic rocks can experience prograde and retrograde pressure and temperature paths.

3)__Metamorphic geologists carefully note the mineral assemblages to estimate the maximum pressures and temperatures of the geologic environment where the rock formed.

4)__Rocks enriched in mafic material are generally lighter in color than felsic rocks.

5)__Asbestos and serpentine commonly form at the interaction of magma and water.

6)__The banding and folding of metamorphic rocks indicate the heat and pressure that has been applied to the rocks.