10-06 Notes GEOL 1200 - 003
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GEOL 1200 - 003
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This 3 page Class Notes was uploaded by Keely Haggar on Friday October 9, 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 14 views. For similar materials see Physical Geology (no lab) in Geology at University of North Carolina - Charlotte.
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Date Created: 10/09/15
Geology 1200 10 06 15 Chapter 8 gt Metamorphism can be tracked using geologic maps gt Deformation gt Geologic Maps Metamorphic Rocks and Deformation 1 How could you determine which hand sample was metamorphosed a The denser one is limestone b The fossiliferous one is marble c The denser one is marble d The one that fizzes is limestone Ans C The denser one is marble Crowders Park gt Kyanite These are polymorphs which helped reveal the history of the Appalachians Blue bladed crstals ALzSiOZ gt High pressure low temperature occurs in continental continental collision resulting in Appalachian mountains and Kyanite o Andalusite and Sillimanite 1 Which shaded zone experienced the maximum 0 100 200 kilometers forces a Green b Blue c Red d Yellow Ans D Yellow ll Not metamorphosed Low Chlonte zone grade Biotite zone Medium Garnet zone grade Staurolite zone 9232 Sillimanite zone gt Meteorite impact or continental continental collision the only way you can make that big of a metamorphic pattern and deformation Around the magma you have heat and that s where the metamorphism occurs Metamorphism One rock transforms into another without melting or becoming sediment Protolith Parent original rock from which a metamorphic rock is formed gt Can be igneous metamorphic or sedimentary Important gt Total element composition is stable gt Mineral composition can change gt Calcium carbon and oxygen Ex Minerals AB and C make up our protolith When they are metamorphosed A is still A B and C are still there but recombined into a different pattern giving you D E and F gt Elements are identical minerals aren t The deeper the hotter Geothermal Gradient gt Gradient varies around the globe 0 Nevada has the hottestmost geothermal energy Sources of Heat gt Geothermal Gradient gt Magma Bodies 0 Contact metamorphism all depends on size of intrusion 1 Recrystallization 2 Compositional Banding Heat the rock up not melt it gives the mafic and felsic opportunity to separate from each other forming strips 3 Melting Igneous Metamorphism at Plate Boundaries gt Regional Metamorphism gt Temperature and PRESSURE changes at large scales Types of Pressure gt Confining Pressure 0 Scuba diver in the ocean feels this 0 Pressure gradientthe deeper you go the higher pressure there is 0 Grain of sand experiences the same thing 0 Makes Metamorphic rocks so dense due to this high pressure gt Differential Stress o Compressional Stress o Shear Stress o Tensional gt Foliation Stressed in two directions more than in the other directions 0 Made a permanent scar o All three differential stresses results in foliation gt Granite interlocking texture no foliation gt Sedimentary rock cement filling spaces between grains no foliation gt Metamorphic rock foliation squished in a consistent orientation Weathering and erosion quot I any l39 4 39 39 39 r 1371th Solidilrcation Partial meilmg quotM 9332 393 1 quot1313 ROCK CYCLE
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