Hutson- GEOL LAB 6.1
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Geology
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Feb 20, 2024
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PRE-LAB QUESTIONS
1.
Where might you find regional metamorphic rocks being formed today? Select all that apply.
a.
In the core of the Himalayas
b.
Adjacent to a lava flow
c.
Near a deep, large igneous intrusion
d.
In a shallow fault zone
e.
None of the above
2.
Match the following foliated rocks with their metamorphic grade: A. Schist
1. Highest grade
B. Slate
2. Second-highest grade
C. Gneiss
3. Second-lowest grade
D. Phyllite
4. Lowest grade
3.
The parent material of a metamorphic rock is known as the __
protolith_.
4.
True or False? Regional metamorphism is a localized event.
5.
What are the three types of metamorphism? Regional, contact, dynamic
©2016, eScience Labs
Metamorphic Rocks
EXERCISE 1 DATA SHEET
Table 5. Metamorphic Rock Identification
Rock
Sample
Foliated
(Yes/No)
Grain Size
Other Textural
Features
Composition
Rock Name
Protolith
M
Yes
Medium
Smooth, hard to
touch
Amphibole,
biotite, calcite,
chlorite, garnet,
kyanite,
muscovite,
quartz,
sillimanite,
tourmaline
schist
Shale,
mudstone,
or siltstone
N
No Coarse Gritty to touch,
hard scaled
Dolomite,
calcite
marble
Limestone or
dolostone
O
No Fine Smooth to touch
but also hard and
displays conchoid
features Plagioclase
feldspar,
andalusite,
biotite,
sillimanite
hornfels
Any rock
type
P
Yes Medium Rough and hard,
slightly colorful
Plagioclase
feldspar.
Amphibole,
biotite, kyanite,
Muscovite,
potassium
feldspar,
sillimanite
Gneiss
Shale,
mudstone,
siltstone, or
granite Q
No
Fine grained
Gritty hardened
granular
Quartz Quartzite
Quartz-rich
sandstone
R
Yes Fine
Metallic luster,
hard shell features
Graphite,
tourmaline
anthracite
Bituminous
coal
©2016, eScience Labs
Metamorphic Rocks
POST-LAB QUESTIONS
1.
How did you determine the compositions of sample N and sample Q? I figured out that determining the protolith of each would be helpful in finding the composition and also had prior knowledge to the composition of marble and quartz. 2.
Where might you find a rock like sample M being formed on Earth today? Schist can be
found in many countries today, such as Brazil, parts of the United States, and Ireland. 3.
Sample R is highly desired in the energy industry because it is the most “clean” variety. Using your knowledge of metamorphic processes, how do you think this rock becomes so “clean” compared to its protolith? Bituminous coal allows more contaminants in the air and is not as environmentally friendly as anthracite coal. On the other hand, anthracite coal is highly carbonated fossil fuel that generates the highest heat out of all fossil fuels, and the low sulfur content in anthracite makes it much more clean burning. Furthermore, Anthracite coal produces no smoke or particulate emissions and is not a fire hazard source when used in more circulated airways like chimneys or ducts. It becomes cleaner than its protolith because the addition of extra heat and pressure alters its overall properties and add in less harmful minerals, thus making it cleaner. ©2016, eScience Labs
Metamorphic Rocks
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