10-09 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 100815 Foliations amp Deformations gt MetaInsanity EC gt Look for earthquake EC later today Foliation in a metamorphic rock is always oriented to the direction of the max differential stress a Perpendicular b Parallel c Diagonally d Randomly Ans a Perpendicular What was the direction of the maximum stress in the sample Downxl Left diagonal I Right diagonalN Left ape9 Clues to Earth s History and Interior Conditions gt Earthquake moved city 10 feet 0 Magnitude 88 o Conception Chile 0 Tsunami affected parts of Australia and SE Asia 0 Comparison to Haiti Types of Pressure Foliation is the direct result of application of differential stress can only happen in one of three ways Three different plate boundaries gt Compressional Stress gt Tensional Stress gt Shear Stress Foliation 3 different grades or types gt Rotation shear gt Dissolution and Recrystallization Highest metamorphic activity high grade rock only in continental continental collision deep below the surface because that s where the highest amount of pressure is found Phyllite Copynght ID 2006 Pearson Prenboe Hall Inc At the axis of collision either you get 1 Distortion of grains from a little bit of heat or 2 Grains deformed by slippage and pressure along planes within the crystalline structure but you get the same result FOLIATION So either a chemical or a physical change Which of the following would you consider a highgrade metamorphic rock a b c d Slate Gneiss Schist Shale Ans B Gneiss Schist is a midgrade metamorphic rock which then turns into the highgrade Gneiss gt LowGrade foliated rock is Slate made very close to surface 0 Phyllite is slightly higher grade but is still lowergrade than schist and gneiss gt MidGrade Garnet crystals Schist gt HighGrade Produces compositional banding Gneiss What s the protolith for Gneiss Schist and you cannot have Schist without Phyllite and so on Metamorphic Rocks and Associated Environments How do we use these rocks gt Walking along and you see different types of rocks slate shale schist etc You have to be walking across a collision boundary Metamorphic Zones gt Index minerals are god indicators of the metamorphic conditions in which they formed When metamorphosing you utilize elements in the rock they don t come out of no where What kind of metamorphism happens close to a magma chamber Contact
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