2. Considering the simplified isobaric phase diagram for the forsterite-quartz system (left) and equilibrium crystallization of melt X (15 wt.% SiO2), as it cools ... a. at what temperature does the first crystal form? b. what is the composition ofthe first crystal to form? c. at 1700°C how much (wt.%) of the melt has crystallized? d.at 1700°Cwhat isthecompositionofthemelt? e. at what temperature is the magma completely crystallized? f. what happens at point P? Considering equilibrium crystallization of melt Y (32 wt.% SiO2), as it cools ... g. at what temperature is the magma completely crystallized? h. what happens at point P? Consider fractional crystallization of melt Y (32 wt.% SiO2) where newly formed crystals sink to the bottom of the magma chamber and form layers as the system cools. j. What is the composition (mineral phase) of the crystals in the bottommost layer? I.e. what was the composition ofthe first crystals to form? k. Describe how the composition (mineral phase) ofthe cumulate crystals changes in subsequent layers as the system continues to cool. L. What is the composition of the final melt, just before crystallization is complete?
2. Considering the simplified isobaric phase diagram for the forsterite-quartz system (left) and equilibrium crystallization of melt X (15 wt.% SiO2), as it cools ... a. at what temperature does the first crystal form? b. what is the composition ofthe first crystal to form? c. at 1700°C how much (wt.%) of the melt has crystallized? d.at 1700°Cwhat isthecompositionofthemelt? e. at what temperature is the magma completely crystallized? f. what happens at point P? Considering equilibrium crystallization of melt Y (32 wt.% SiO2), as it cools ... g. at what temperature is the magma completely crystallized? h. what happens at point P? Consider fractional crystallization of melt Y (32 wt.% SiO2) where newly formed crystals sink to the bottom of the magma chamber and form layers as the system cools. j. What is the composition (mineral phase) of the crystals in the bottommost layer? I.e. what was the composition ofthe first crystals to form? k. Describe how the composition (mineral phase) ofthe cumulate crystals changes in subsequent layers as the system continues to cool. L. What is the composition of the final melt, just before crystallization is complete?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
2. Considering the simplified isobaric phase diagram for the forsterite-quartz system (left) and equilibrium crystallization of melt X (15 wt.% SiO2), as it cools ...
a. at what temperature does the first crystal form?
b. what is the composition ofthe first crystal to form?
c. at 1700°C how much (wt.%) of the melt has crystallized?
d.at 1700°Cwhat isthecompositionofthemelt?
e. at what temperature is the magma completely crystallized?
f. what happens at point P?
Considering equilibrium crystallization of melt Y (32 wt.% SiO2), as it cools ...
g. at what temperature is the magma completely crystallized?
h. what happens at point P?
Consider fractional crystallization of melt Y (32 wt.% SiO2) where newly formed crystals sink to the bottom of the magma chamber and form layers as the system cools.
j. What is the composition (mineral phase) of the crystals in the bottommost layer? I.e. what was the composition ofthe first crystals to form?
k. Describe how the composition (mineral phase) ofthe cumulate crystals changes in subsequent layers as the system continues to cool.
L. What is the composition of the final melt, just before crystallization is complete?
Transcribed Image Text:Dot
1900
1800
1700
1600
1500
X₁
Fo + Liq
Fo+ En
0
Mg2 SiO4
Fo
20
Y.
P
40
MgSiO3
En
Liquid
Qz+ En
60
Qz + Liq
Wt.% Quartz
80
100
SiO₂
QZ
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