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JMU - GEOL 110 - Class Notes - Week 5

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JMU - GEOL 110 - Class Notes - Week 5

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background image Lecture 6 – Metamorphic Rocks  Metamorphic Rocks  Definition – rocks that formed from preexisting rocks (the protolith), and undergo mineralogical 
and textural changes in response to increased heat and/or pressure.
  o Protolith – can be igneous, sedimentary, or metamorphic.  Recrystallization – changes in the shape and size of grains without changing the mineral 
that constitutes the grains. 
Phase change – transformation of a grain of one mineral into a different mineral with the
same chemical composition but a different crystal structure. 
Metamorphic reaction – results in the growth of new mineral crystals that differ from 
those of the protolith. 
Causes of Metamorphism  Metamorphism due to heating: o Temperatures needed to metamorphose felsic (continental) rocks: 200 – 850 C o Temperatures needed to metamorphose mafic (oceanic) rocks: up to 1200 o C Metamorphism due to increased pressure: o At least 2 kbar (i.e. burial to depths of at least 6 km Increasing both pressure and temperature:  Foliated rocks = regional metamorphism  Differential stress (compression):  o Results in mineral alignment  Types of Metamorphic Rocks  Foliated (layered) metamorphic rocks: 
(i.e. Slate – planar foliation; fine­grained)
(i.e. Phyllite – crenulated (slightly wavy) foliation; medium­grained) 

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School: James Madison University
Department: Geology
Course: Geology
Professor: Cindy Kearns
Term: Fall 2016
Tags: Geology and Physical Geology
Name: GEOL. 110 - Week 5 Notes
Description: These notes cover all of week 5 lecture.
Uploaded: 02/08/2018
2 Pages 28 Views 22 Unlocks
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