Transcript Lecture 08B / Metamorphic Rocks

Metamorphic Rocks
GLG 101 - Physical Geology
Bob Leighty
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.
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 ([email protected]).
Leave no questions behind!
Explore and have fun!
Metamorphic
Rocks
Classifying Metamorphic Rocks
Texture
 Layered vs. non-layered arrangement of crystals
Metamorphic
Rocks
Classifying Metamorphic Rocks
Texture
Non-foliated
 Random arrangement of crystals
 Form by either contact metamorphism or regional metamorphism
quartzite
marble
Metamorphic
Rocks
Classifying Metamorphic Rocks
Texture
Foliated
 Layered arrangement of crystals (foliation)
 Form by regional metamorphism
mudstone
gneiss
(original rock)
schist
phyllite
slate
Metamorphic
Rocks
Classifying Metamorphic Rocks
Texture
Foliated
 Formed by cataclastic metamorphism
mylonite
Metamorphic
Rocks
Parent Compositions
 The parent (original) composition may or may not be obvious
 If not, it can be inferred from index minerals
Parent rock
Metamorphic
Rocks
Parent Compositions
Name That Protolith
Parent rock (protolith)
Nonfoliated MM rock
sandstone
Contact
OR
Regional
quartzite
limestone
Contact
OR
Regional
marble
Metamorphic
Rocks
Parent Compositions
Name That Protolith
Parent rock (protolith)
mudstone
Foliated MM rock
Regional
schist
OR
granite
Regional
gneiss
Metamorphic
Rocks
Metamorphic Rocks of Arizona
Squaw Peak (Phoenix, AZ)
Metamorphic
Rocks
Metamorphic Rocks of Arizona
South Mountain & Sierra Estrella (Phoenix, AZ)
Metamorphic
Rocks
Metamorphic Rocks of Arizona
Mazatzal Mountains (central Arizona)
Metamorphic
Rocks
Metamorphic Rocks of Arizona
Bradshaw Mountains (central Arizona)
Metamorphic
Rocks
Metamorphic Rocks of Arizona
Inner Gorge of the Grand Canyon
Metamorphic
Rocks
Metamorphic Rocks of the USA
New England
Metamorphic
Rocks
Metamorphic Rocks of the World
The Alps (Europe)
Metamorphic
Rocks
WWW 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