LAB 7 PRELAB - Metamorphic Rocks - Final
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Broward College *
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1010
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Geology
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Apr 3, 2024
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PRELAB - Metamorphic Rocks
DIRECTIONS – 20 points are possible
After completing the reading and watching the videos, answer the following questions in your own words and provide links to your sources for any Internet information used (do not copy and paste answers directly from the websites, this constitutes plagiarism). Each answer should contain enough detail to address all parts of the question. Responses will require 2-5 sentences.
1.
How does metamorphism change a rock?
Metamorphism changes a rock through the application of heat, pressure, and chemical processes over time. It alters the rock's mineral composition, texture, and structure.
2.
List the three agents of metamorphic change.
Heat provides the energy for chemical reactions and mineral transformations.
Pressure causes minerals to align and affects the density of the rock.
Fluids facilitate chemical reactions and mineral growth by transporting ions and aiding in recrystallization.
3.
Describe how metamorphism and plate tectonics are related.
The movement of lithospheric plates at plate boundaries promotes the formation of metamorphic rocks through processes such as regional metamorphism, contact metamorphism and fault zone metamorphism.
4.
About how deep does a rock need to be buried to be subject to metamorphic change?
Rocks generally need to be buried to depths of at least a few kilometers to undergo significant metamorphic change.
5.
What is meant by the term “parent rock”?
Refers to the original rock from which a metamorphic rock is formed. It is the precursor or starting material that undergoes metamorphism.
For example, if limestone undergoes metamorphism due to heat and pressure.
6.
Please describe what is meant by folitation in a metamorphic rock. 7.
Refers to the parallel alignment of mineral grains or the development of planar structures within the rock, resulting in a layered or banded appearance.
8.
These four metamorphic rocks are in your kit. Please order them from lowest to highest grade of metamorphism. (Phyllite, Gneiss, Slate, Schist).
___Slate_____________
_______
Phyllite _________
_____
Schist ___________
_______
Gneiss_________
Lowest Grade
Lo-Mid Grade
Hi-Mid Grade
Highest Grade
BC Online – Physical Geology Lab (GLY1010L) Use this document as your template. Make space to separate your responses from the questions.
PRELAB - Metamorphic Rocks
9.
Now, take those four foliated samples, and line them up and make a background to indicate increasing metamorphic grade (similar to what is shown above) and photograph them. Insert
your photo or otherwise submit it with this pre-lab. 10. There are two non-foliated rocks in your kit. One is composed of SiO
2
and the other of CaCO
3
. Please identity the rocks below by their chemistry.
SiO
2
: _______
Quartzite ______________
CaCO
3
: ________
marble ___________ 11. Metamorphic rocks are sometimes used as kitchen or bathroom countertop material. If you could pick on for your kitchen, which would you choose, and why? Granite:
Granite is one of the hardest and most durable natural stones available for countertops.
Granite has excellent heat resistance properties.
Granite countertops are relatively low maintenance and easy to clean.
BC Online – Physical Geology Lab (GLY1010L) Use this document as your template. Make space to separate your responses from the questions.
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