GY 111: Physical Geology
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1 UNIVERSITY OF SOUTH ALABAMA GY 111: Physical Geology Lecture 25: Metamorphic Facies
2 Last Time Contact Metamorphism A) Metamorphic Aureoles B) Isograds C) Index minerals and metamorphic grade
3 Contact Metamorphism Heat only Induced by hot intrusions Metamorphic aureoles
4 Contact Metamorphism Metamorphic grade decreases from the intrusion into the country rock
5 Contact Metamorphism Contact metamorphism is commonly very obvious in outcrop Aureole Sill Limestone Aureole Shale
6 Contact Metamorphism Marble Limestone Hornfels Sill Shale
7 Contact Metamorphism Metamorphic Isograds
8 Isograds Isograds around the Kangmar Dome of Tibet Contact Metamorphism
9 Isograds Isograds in Scotland Regional Metamorphism
10 Index Minerals (Felsic rocks)
11 Index Minerals (Mafic rocks) Important observation: Amphibole only forms from parent rocks rich in Fe and Mg. Therefore the parent rock of most amphbolites is basalt
12 Today s Agenda Last bit about Metamorphism A) Metamorphic Facies B) Retrograde Metamorphism C) Shock Metamorphism Web notes 25A: Metamorphic Facies Web notes 25B: Retrograde Metamorphism
13
14 The Problem: Parent rock Shale Rhyolite Granite Grade Metamorphic rock (granite) Gneiss
15 The Problem: Parent rock Shale Rhyolite Granite Grade Metamorphic rock (granite) Gneiss The Solution: Consider conditions of pressure and temperature rather than parent rock composition
16 Low Lowest Grade Temperature Pressure est Grade
17 Low Temperature Zeolite facies Pressure
18 Low Zeolite facies Temperature Hornfels facies Pressure
19 Low Zeolite facies Temperature Hornfels facies Pressure
20 Low Zeolite facies Temperature Hornfels facies Pressure Greenschist
21 Low Zeolite facies Temperature Hornfels facies Pressure Greenschist Amphibolite
22 Low Temperature Zeolite facies Hornfels facies Pressure Greenschist Amphibolite Granulite
23 Low Temperature Zeolite facies Hornfels facies Pressure Greenschist Amphibolite Granulite Eclogite facies
24 Low Temperature Zeolite facies slate phyllite Hornfels facies Pressure Greenschist Amphibolite Granulite gneiss Eclogite facies
25 Low Temperature Zeolite facies slate phyllite Hornfels facies Pressure Greenschist Amphibolite Granulite gneiss Eclogite facies
26 Low Temperature Pressure
27 Low Temperature Zeolite facies slate phyllite Hornfels facies Pressure Greenschist Amphibolite Granulite gneiss Eclogite facies
28 Low Temperature Pressure
29 Low Temperature Pressure
30 One More Type of Metamorphism Shock metamorphism: -caused by high energy impacts (e.g., asteroids)
31 Today s Homework 1. Start Studying for finals (word list 3 is up) 2. Rock/mineral assignment due Friday by 5:00 PM Next Time 1. Structural geology part 1 GY 302 Poster Session. Tuesday Nov 22 12:00-2:00PM (Bonus) Rock and Gem Show Thanksgiving weekend (Bonus) proof of attendance required for both bonuses
32 GY 111: Physical Geology Lecture 25: Metamorphic Facies Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposes. For personal use only.
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