Finnish geologist Pentti Eskola recognized that the volcanic rock basalt could be metamorphosed to different metamorphic facies (unique assemblages of several minerals) under changing conditions of pressure and temperature: - Amphibolite facies (low pressure, high temperature): black hornblende amphibole, sillimanite. - Greenschist facies (low pressure, low temperature): green actinolite amphibole and chlorite. - Eclogite facies (high pressure, high temperature): red garnet, green pyroxene. - Blueschist facies (high pressure, low temperature): blue amphibole (glaucophane, riebeckite) and lawsonite. 1. Write the names of these metamorphic facies in their proper places on the dotted lines marked A through D in the P-T diagram (Fig. A7.5.4). Notice that pressure and depth increase downward in this diagram, and temperature increases to the right. diagenesis px-hornfels sanidinite H10 20 granulite 30 40 15 50 100 200 300 400 500 600 700 800 900 Temperature (°C) Pressure (kilobars) zeolite subgreenschist B. epidote-amphibolite Depth (km)
Finnish geologist Pentti Eskola recognized that the volcanic rock basalt could be metamorphosed to different metamorphic facies (unique assemblages of several minerals) under changing conditions of pressure and temperature: - Amphibolite facies (low pressure, high temperature): black hornblende amphibole, sillimanite. - Greenschist facies (low pressure, low temperature): green actinolite amphibole and chlorite. - Eclogite facies (high pressure, high temperature): red garnet, green pyroxene. - Blueschist facies (high pressure, low temperature): blue amphibole (glaucophane, riebeckite) and lawsonite. 1. Write the names of these metamorphic facies in their proper places on the dotted lines marked A through D in the P-T diagram (Fig. A7.5.4). Notice that pressure and depth increase downward in this diagram, and temperature increases to the right. diagenesis px-hornfels sanidinite H10 20 granulite 30 40 15 50 100 200 300 400 500 600 700 800 900 Temperature (°C) Pressure (kilobars) zeolite subgreenschist B. epidote-amphibolite Depth (km)
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
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Question
Transcribed Image Text:C Finnish geologist Pentti Eskola recognized that the volcanic rock basalt could be metamorphosed to different metamorphic
facies (unique assemblages of several minerals) under changing conditions of pressure and temperature:
" Amphibolite facies (low pressure, high temperature): black hornblende amphibole, sillimanite.
- Greenschist facies (low pressure, low temperature): green actinolite amphibole and chlorite.
· Eclogite facies (high pressure, high temperature): red garnet, green pyroxene.
- Blueschist facies (high pressure, low temperature): blue amphibole (glaucophane, riebeckite) and lawsonite.
1. Write the ames of these metamorphic facies in their proper places on the dotted lines marked A through D in the P-T
diagram (Fig. A7.5.4). Notice that pressure and depth increase downward in this diagram, and temperature increases to
the right.
diagenesis
px-hornfels sanidinite
10
20
granulite
30
my
40
15
50
100
200
300
400
500
600
700
800
900
Temperature (°C)
Figure A7.5.4
Pressure (kilobars)
zeolite
subgreenschist
B.
epidote-amphibolite
Depth (km)
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Follow-up Question
What is the significance of the gray area of the P-T diagram in Fig. A7.5.4 that is marked by a large question mark? Hint: Where on or in Earth would you find the P-T conditions in that gray area, if anywhere?
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