Download Worksheet -

GEOLOGY 12
CHAPTER 7 WORKSHEET
METAMORPHIC ROCKS
Name __________________
Use the following terms to complete the fill-in-the-blank questions. Terms may be used more than once.
700-800
atoms
banding
contact
denser
diagenesis
directed stress
equal
fault zone
foliation
heat
high
hornfels
hydrothermal
index minerals
isograds
layering
limestone
low
melting
metamorphic facies
metasomatism
migmatite
non-foliated
plutonic
pressure
regional
schist
slate
1.
The two most important causes of metamorphism are _________________ and
_________________.
2.
The low end of metamorphic temperatures represent temperatures in which
__________________ occurs.
3.
The high end of metamorphic temperatures is limited by the _______________ temperature of
rocks, above which the rocks are molten.
4.
The typical range of metamorphic temperatures would be from 100-200°C to about
_______________ °C, although dry mafic rocks could be heated to even higher temperatures
without melting.
5.
___________________ activity can locally increase the temperatures caused by the normal
geothermal gradient.
6.
Confining pressure is ________________ in all directions surrounding a rock.
7.
Pressure that is not uniform in all directions is called ____________________________.
8.
Mountain building generally places ____________________________ on rocks, which can result
in deformation of the rocks.
9.
The role of hot fluids in metamorphism is described as ____________________ activity.
10.
During metamorphism, _______________ can rearrange themselves more readily in the
presence of fluids.
11.
As temperatures are increased during metamorphism, minerals that are stable at
________________ temperatures react or break down to form new high-temperature
minerals.
12.
Increased confining pressures favor the formation of ________________ minerals, whose atoms
are packed more closely together.
13.
Increasing the directed stress on rocks during metamorphism usually produces some sort of
textural or compositional ___________________ or ___________________.
14.
Schistosity and gneissic texture are two examples of _____________________ in metamorphic
rocks, the product of directed stress.
15.
The introduction of ions in fluids during metamorphism is called ________________________.
16.
A fine-grained metamorphic rock exhibiting slaty cleavage would be called a __________.
17.
A foliated metamorphic rock in which mica minerals are aligned in parallel layers would be called
a ____________________.
18.
Rocks which consist of only one type of mineral are likely to be _____________________ when
they are metamorphosed.
19.
Marble is a metamorphosed ________________________.
20.
____________________ metamorphism is commonly associated with mountain building, on a
large scale.
21.
____________________ metamorphism happens adjacent to plutons, and generally lacks
directed stresses.
22.
Fault-zone metamorphism is characterized by increased pressures, but ___________
temperatures.
23.
A fault breccia is formed by ________________________ metamorphism.
24.
Rocks of a particular _____________________ ____________ will contain one or more minerals
typical of a particular restricted range of pressures and temperatures.
25.
Contact metamorphic facies (and minerals) are the product of ____________ pressure and a
wide range of temperatures.
26.
The contact metamorphic facies likely to be found closest to a pluton would be the
______________________ facies.
27.
If partial melting begins during metamorphism, the resulting "mixed rock" would be termed a
______________________.
28.
Differences of metamorphic grade are recognized on the basis of the presence of certain
_____________ _______________, each of which is stable over a restricted
temperature/pressure range.
29.
_____________________.is an example of an index mineral.
Chapter 7 WS
page 2
30.
Lines of equal metamorphic grade are called _____________________.
31.
Describe the following rocks in terms of composition, texture and/or formation:
a) stretched pebble conglomerate
b) anthracite coal
c) graphite
32.
List the three main factors that affect metamorphism.
•
•
•
33.
34.
Classify the following rocks as foliated (F) or non-foliated (NF):
_____ phyllite
_____ quartzite
_____ anthracite
_____ marble
_____ gneiss
_____ metaconglomerate
_____ schist
_____ slate
Arrange the foliated rocks from the lowest degree to the highest degree of metamorphism.
_______________ → _______________ → _______________ → _______________
Chapter 7 WS
page 3