Mid-Unit_Melting_FA23
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Arizona State University *
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Course
112
Subject
Geology
Date
Dec 6, 2023
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GLG 112: Geologic Disasters
Mid-Unit Assignment: Identifying Melting Processes
Purpose: This assignment is designed for you to practice your comprehension of the different types of plate
boundaries and the magmas generated at these locations.
Instructions: Work with 1 – 2 partners to complete the following. Make sure everyone in your group understands
each step before moving on. Grading criteria for each question is indicated by (
parentheses and italicized
).
Part I. Magma along a cross section.
Figure 1. A Google Map image of north-western South America, the Galapagos Islands and the Pacific Ocean. Plate
boundaries are highlighted by white lines. The cross section from A to A’ below is represented by the dashed line.
Plate names are indicated in italics.
Question 1.
There are two plate boundaries shown in this diagram.
a.
Which plate boundary type is on the left, between the Pacific and Nazca plates?
(1 pt)
b.
Which plate boundary type is on the right, between the Nazca and South American plates?
(1 pt)
c.
What type of melting occurs at these plate boundaries?
Left
(1 pt)
:
Right
(1 pt)
:
A
A’
Sea Level
A
A’
The Galapagos
Islands
The Andes
Mountains
Figure 2. Cross section of figure 1 from A to A’ showing the plate interactions along this line. Black lines indicate
lithospheric plate and gray shading indicates magma locations. Thick crust represents continental crust, and thin
crust represents oceanic.
Pacific
Plate
Nazca
Plate
South American
Plate
East Pacific Rise
2
Question 2.
There is melting shown in another location in Figure 2, which creates the Galapagos Islands.
a.
What is this geologic feature called
(2 pt)
?
b.
What type of melting occurs at this feature
(1 pt)
?
Question 3.
There are two phase diagrams shown below labeled A and B. Indicate in the blanks below which
diagram is applicable to explain why melting occurred at the different locations in Figure. Please use the
answers you found for question 1a and 1b and question 2a to fill in these blanks.
A: __________________________
(1 pt)
B: __________________________
(1 pt)
__________________________
(1 pt)
Question 4.
We would expect the magmas that erupt at these locations to be different in terms of composition
and explosivity.
a.
Two of the locations that produce magma in Figure 2 would have a similar composition. What would you
expect the composition of these magmas to be (mafic, intermediate or felsic)?
(1 pt)
b.
What would you expect the composition of the magmas erupted at the third location to be (mafic,
intermediate or felsic)?
(1 pt)
c.
Which one of these locations would have the most explosive volcanism?
(1 pt)
d.
Why would this location be the most explosive?
(2 pt)
Question 5.
We would also expect the land forms created to be different.
a.
What volcanic land form is created from the eruptions that formed the Galapagos Islands?
(1 pt)
b.
What volcanic land form is created from the eruptions that form volcanoes the Andes Mountains?
(1 pt)
Question 6.
Think about the hazards associated with the volcanoes in these locations.
a.
Which location would be the most dangerous?
(1 pt)
b.
Why do you think this?
(2 pts)
/20 points
A
B
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