GLG 101 - Physical Geology Bob Leighty Metamorphic Rocks.

GLG 101 - Physical GeologyGLG 101 - Physical Geology Bob LeightyBob Leighty

Metamorphic RocksMetamorphic Rocks

These lecture notes are very similar to the ones I use in my traditional classes. You’ll find they are loaded with imagery and streamlined text that highlight the most essential terms and concepts. The notes provide a framework for learning and, by themselves, are not meant to be a comprehensive source of information.To take advantage of the global knowledge base known as the Internet, I have included numerous hyperlinks to external web sites (like the Wikipedia, USGS, NASA, etc.). Follow the links and scan them for relevant info. The information from linked web sites is meant to supplement and reinforce the lecture notes – you won’t be responsible for knowing everything contained in them.

As a distance learning student, you need to explore and understand the content more independently than in a traditional class. As always, I will help guide you through this learning adventure. Remember, email Dr. Bob if you have any questions about today’s lecture (rleighty@mail.mc.maricopa.edu).Leave no questions behind!Explore and have fun!Explore and have fun!

These notes and web links are your primary “lecture” content in this class. Additionally, various articles are assigned each week to supplement this “lecture” information. I believe you’ll have enough information to reference without having to purchase a costly textbook.

TextureTexture Layered vs. non-layered arrangement of crystals

Classifying Metamorphic RocksClassifying Metamorphic RocksMetamorphicMetamorphicRocksRocks

TextureTextureClassifying Metamorphic RocksClassifying Metamorphic Rocks

Non-foliatedNon-foliated Random arrangement of crystals

marblequartzite

Form by either contact metamorphism or regional metamorphism

MetamorphicMetamorphicRocksRocks

FoliatedFoliated Layered arrangement of crystals (foliation) Form by regional metamorphism

phyllite

schist

gneiss

increasing P & T

(MM grade)

mudstone

(original rock)

mylonite

FoliatedFoliated

Formed by cataclastic metamorphism

Parent CompositionsParent Compositions

If not, it can be inferred from index minerals

The parent (original) composition may or may not be obvious

Parent rock

Parent rock (protolith) Nonfoliated MM rock

sandstone quartzite

limestone marble

Name That ProtolithName That Protolith

ContactOR

Regional

ContactOR

Regional

Parent CompositionsParent CompositionsMetamorphicMetamorphicRocksRocks

Parent rock (protolith) Foliated MM rock

gneiss

schistmudstone

granite

Regional

Name That ProtolithName That Protolith

Regional

Parent CompositionsParent CompositionsMetamorphicMetamorphicRocksRocks

Metamorphic Rocks of ArizonaMetamorphic Rocks of Arizona

Squaw Peak (Phoenix, AZ)

South Mountain & Sierra Estrella (Phoenix, AZ)

Mazatzal Mountains (central Arizona)

Bradshaw Mountains (central Arizona)

Inner Gorge of the Grand Canyon

Metamorphic Rocks of the USAMetamorphic Rocks of the USA

New England

Metamorphic Rocks of the WorldMetamorphic Rocks of the World

The Alps (Europe)

WWW Links in this LectureWWW Links in this Lecture> Metamorphic rock - http://en.wikipedia.org/wiki/Metamorphic_rock > Contact metamorphism - http://en.wikipedia.org/wiki/Metamorphism#Contact_.28Thermal.29_metamorphism

> Regional metamorphism - http://en.wikipedia.org/wiki/Metamorphism#Regional_metamorphism> Quartzite - http://en.wikipedia.org/wiki/Quartzite> Marble - http://en.wikipedia.org/wiki/Marble> Foliation - http://en.wikipedia.org/wiki/Foliation_%28geology%29> Slate - http://en.wikipedia.org/wiki/Slate> Phyllite - http://en.wikipedia.org/wiki/Phyllite> Schist - http://en.wikipedia.org/wiki/Schist> Gneiss - http://en.wikipedia.org/wiki/Gneiss> Cataclastic metamorphism - http://en.wikipedia.org/wiki/Metamorphism#Dynamic_metamorphism

> Mylonite - http://en.wikipedia.org/wiki/Mylonite> Index mineral - http://en.wikipedia.org/wiki/Index_mineral

GLG 101 - Physical Geology Bob Leighty Metamorphic Rocks.

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