Chapter 8.docx

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Department
Geology
Course
GEOL 1100
Professor
Xuefeng Liu
Semester
Fall

Description
Chapter 8: Metamorphic Rocks I. Metamorphic Rocks: formed from alteration of other rocks due to changes in  pressure, temp and reaction with fluids by process of metamorphism A. Metamorphic settings 1. contact or thermal metamorphism: driven by rise in temperature within  host rock. Occurs when rocks are in contact with igneous body,  resulting in formation of zones of alteration around magma called  aureoles •most contact metamorphic rocks are fine­grained, dense, tough rocks  with various chemical compositions, generally not foliated* 2. hydrothermal metamorphism,: chemical alterations from hot, iron­rich  water. Most occurs along mid­ocean ridge system 3. regional metamorphism: occurs during mountain building; produces  greatest value of rock (display zones of two other types of  metamorphism). Takes place at considerable deaths over extensive  area. Gradiation is degree of change often occurs 4. burial and subduction zone metamorphism B. What causes metamorphism? 1. change of temperature (like heat from magma chamber below the  surface, most important), pressure, interaction with chemically active  fluids a. confining pressure­ increases with depth; rocks may recrystallize  into more compact forms b. differential stress­ rocks subjected to this during mountain  building; shortens them in direction pressure is applied, lengthens  them in direction perpendicular to force. Change like this because  rocks are are warm and ductile at death 2. mineral makeup of parent rock determines which factor
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