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Ch 8 Textbook Outline

by: Keely Haggar

Ch 8 Textbook Outline GEOL 1200 - 003

Keely Haggar
GPA 2.0
Physical Geology (no lab)
Jake Armour

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About this Document

Textbook outline for this weeks chapter coverage.
Physical Geology (no lab)
Jake Armour
Class Notes
Geology, Physical Geology, armour
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This 2 page Class Notes was uploaded by Keely Haggar on Saturday October 17, 2015. The Class Notes belongs to GEOL 1200 - 003 at University of North Carolina - Charlotte taught by Jake Armour in Summer 2015. Since its upload, it has received 20 views. For similar materials see Physical Geology (no lab) in Geology at University of North Carolina - Charlotte.


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Date Created: 10/17/15
Geology 1200 Textbook Outline 101515 Quick Chapter 8 Review Shale Parent Rock 9 Slate Low Grade Metamorphism Granodiorite Parent Rock 9 Folded Gneiss High Grade Metamorphism Low Grade Low temp low pressure closer to surface High Grade High temp high pressure strong forces deep underground Confining Pressure Analogous to water pressure force is applied in all directions equally Differential Stress Unequal forces squeezes different sized forces in different directions Aka Compressional Stress Foliation Rearrangement of crystals or mineral grains in a rock creating bands Rock Slaty Cleavage Splits easily into perfect thin slabs Parent rockwith Ion migration causes randomly oriented light and dark minerals mineral grains to separate ll l Ill 39 39 r l39 r y l Differential v2 39 lt stress gt I y c r 4 i e V If r 39 V l l I Unmetamorphosed Highgrade Gneissic textugznnis Tasa metamorphism Regional Metamorphism Common widespread usually associated with mountain building Collision of two continental blocks Impact Shock Metamorphism High speed projectiles meteorites strike Earth s surface On impact the energy of the meteorite is transformed into heat energy and shock waves pass through the rock it has come in contact with and that it is surrounded by The rock becomes pulverized shattered and occasionally melted What drives Metamorphism Heat pressure stress and chemically active fluids Burial of rock Confining pressure from burial Differential stress from tectonic forces Water is an important chemically active fluid in Earth s crust Hot water can enduce many chemical reactions and transport dissolved minerals VVVVV What are some common metamorphic rocks gt Foliated Rocks 0 Slate Phyllite schist gneiss from low grade to high grade gt NonFoliated o Quartzite marble hornfels the recrystallized rocks that form from quartz sandstone limestone and shale Key Terms Metamorphic Aureole Hydrothermal Metamorphism Occurs when hot water acts as the agent of heat dissolves a variety of ions which may chemically react with the surround rocks forming new minerals Burial Metamorphism Rocks buried beneath kilometers of overlying rock under high temperature and confining pressure Subduction Zone Metamorphism Similar to burial metamorphism with the addition affect of differential stress Metamorphic Zones Index Mineral Minerals which are good indicators of the metamorphic environment in which they formed allowing geologists to discover different zones of regional metamorphism gt Chlorite forms when temperatures are low rocks that contain chlorite slates are referred to as low grade Migmatite Partially melted rock cools the light bands are composed of igneous or igneouslike components dark bands consist of unmelted metamorphic matter migma mixture ite a stone gt Magmatites show that some rocks are transitional and do not fit perfectly into one of the three basic rock groups Know gt Grain size increases with metamorphic grade gt Certain minerals act as indicators 0 the environment 0 Chlorite lowgrade o Garnet and Staurolite are index minerals for intermediate grade 0 Sillimanitehighgrade Chapter 9 Earthquakes and Earth s Interior gt Earthquake in Haiti back in 2010 magnitude of 70 on the Richter scale Earthquakes are ground shaking caused by the sudden and rapid movement of one block of rock slipping past faults in the Earth s crusts


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