Assignment 2 - Igneous & Metamorphic identification & processes-1 (2)
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Middlesex Community College *
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Course
2020
Subject
Geology
Date
Jan 9, 2024
Type
docx
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5
Uploaded by JudgeResolve12987
Assignment 2 - Igneous and Metamorphic Rock Identification
For this assessment, you will be identifying various rocks in much the same way as you did the minerals. You will use the information you learned in this module to complete the charts below.
Instructions:
1.
You will need to use the rock identification charts provided to help identify these rocks. You can enlarge the picture by clicking on it and dragging the edges.
2.
Complete the rock sample identification charts (linked on canvas) by using the rock sample pictures, the rock identification chart, and your knowledge from the text and lectures. 3.
Complete the analysis and application section using your knowledge from the text and lectures. 4.
Make sure your name is on the document before saving.
5.
Save the file as: Rocks_Lastname,FirstInitial (example – Rocks_Dunning,C)
Igneous Rocks Samples
Sample #1:
Sample #2:
Sample #3:
Metamorphic Rock Samples
Sample #1:
Sample #2:
Sample #3:
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Igneous Rock Identification Chart (5 points)
Sample #
Composition
Texture
Comments
Rock Name
Example
Quartz/Feldspar
Aphanitic
Mostly pink
Rhyolite
1
2
3
Metamorphic Rock Identification Chart (5 Points)
Sample
#
Texture (Foliated
or Non-foliated)
Composition (what you
see in the rock/minerals
present)
Rock
Name
Parent
Rock
Comments
Example
F
Tiny crystals, Shiny surface
Phyllite
Slate
1
2
Fizzes in acid
3
Very flaky,
layered
Analysis and Application (10 points)
1.
Based on the rock cycle and what you have observed about igneous rocks, what processes help create igneous rocks? (1 point)
2.
Based on the rock cycle and what you have observed about metamorphic rocks, what processes help create metamorphic rocks? (1 point)
3.
Speculate on how the different processes of the rock cycle relate to the various rock textures. In other words, what role do the various processes (for each rock type) play in determining their textures? (2 points)
4.
As a rock climber you decide you want to climb the Dike Wall at Mammoth Lakes, California. Based on what you know about partial melting and magmatic differentiation, explain the change in rock as you climb vertically off the ground. Include examples of the rock you pass, their mineral assemblages, and their classifications (texture & composition). Then provide an explanation as to why the rocks changed as they did. Assume the basement rock is peridotite. (3 points)
5.
Now that you climbed the Dike Wall you decide to move over and climb the contact run. Imagine the dike cuts through a layer of limestone, sandstone, shale, and volcanic tuff. Describe what other rocks and mineral assemblages you would find at the “contact” between the dike and surrounding rock layers. (3 points)