Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/42

Click to flip

42 Cards in this Set

  • Front
  • Back
The change (at depth) from one rock to another- due to:

Pressure Increases
Temperature increase
Influences by the presence of fluids
Geologic Time
Metamorphism
Includes reactions of mineralsto changes @ depth
Response to Equilibrium
Metamorphism change takes place in a ____ state.
solid
Composition of Parent Rock
the starting point
Maybe confining pressure aka Lithostatic pressure
Pressure at Depth
-Composition of Parent Rock
-Temperature
-Pressure at Depth
Factors controlling the characteristics of Metamorphic rocks
Geothermal gradient _____ with ____
increases, depth
Temperature of meta rocks may be heated by friction from
Plate Tectonics
Temperature of meta rocks may be cooled by
igneous masses
Like Bowen's Reaction Series as far as temperature...
some minerals may melt
= Directed Pressure

-the influence that changes texture
Stress (the force)
Differential Stress is
Directed Pressure
Differential Stress / Directed Pressure can include:
-compressive stress
-shearing
equal and opposite
compressive stress
opposite but parallel
shearing
alignment of rock fabrics or minerals; in response to Directed Pressure
Foliation
Slaty Cleavage
Schistose
Gneissic texture
examples of foliation
Differential Stress causes...
Strain
Strain results in
Foliation
Type of metamorphic rock formed from directed pressure of mountain building processes or other tectonism (earth movements)
Regional
Type of metamorphic rock formed from contact with cooling igneous masses (magma or lava)
Contact
Type of metamorphic rock formed in association wih hot fluids (most commonly water)
Hydrothermal
-hot water may carry ions from place to place
-trigger metamorphic chemical reactions
controlling factor of fluids-hydrothermal
can only happen in Geologic time
time
-Not aligned
-named on the basis of its composition
-ex: quartzite and marble
Non-foliated rock texture
-Aligned minerals or rock fabric
-Determine type of foliation
-ex: schist
Foliated Rock texture
Progressive Metamorphism =
Regional
-Progressively greater temperature and pressure
-shale (the sedimentary rock)
~Slate -> Phyllite -> Schist -> Gneiss -> Migmatite
Progressive Metamorphism
-Hydrothermal Minerals
-Hydrothermal Activity at Diverging Plate
-Ore Deposits at Diverging Plate Boundaries
-Metasomatism
Hydrothermal Processes
from wet to dry
metasomatism
In metasomatism water exchanges ions from...
rock to rock
minerals emplaced in cracks, joints, faults
veins
minerals emplaced in pores or vesicles
disseminated
-Ground Water
-Water Trapped in Sediments
-Hydrous Minerals
Sources of water
like the copper ore in Michigans UP- the most economically valuable ore type
disseminated ore deposits
May take place at considerable depth and high temperatures
Regional Metamorphism
Regional Metamorphism is aka
dynamothermal metamorpshism
minerals include actinolite (new, asbestos min) and sodium rich plagioclase
basalt -> greenschist
minerals include hornblede, plagioclase feldspar, and garnet (another new mineral!)
Basalt -> amphibole schist
contact metamorphism is aka
thermal metamorphism
-Narrow zone of contact of country rock with cooling igneous mass...
-Forms a non-foliated MetaRx
Contact Metamorphism
Shale -> Hornfels
Limestone -> Marble
Sandstone -> Quartzite (Quartz grains welded together)
examples of nonfoliated contact MetaRx