Geology Notes Week 3
Geology Notes Week 3 GEOL1005
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This 2 page Class Notes was uploaded by Kate Notetaker on Friday January 29, 2016. The Class Notes belongs to GEOL1005 at George Washington University taught by Catherine A. Forster in Winter 2016. Since its upload, it has received 34 views. For similar materials see Historical Geology in Geology at George Washington University.
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Date Created: 01/29/16
January 28, 2016 What to remember for the exam: o Starts with definitions o Short answer questions o Multiple choice questions Divergent Boundaries o Plates are pulling away from each other Actually being pushed away from each other by new crust coming up and accreting itself Brand new crust/rock/lithosphere being formed o Spreading centers o Lithosphere the crust and upper mantle Asthenosphere is where the lithosphere starts to melt (partially molten) o Asthenosphere starts to come up and thin out the lithosphere Eventually causing a fraction o When this happens it almost always happens in a triple-junction Splits apart with three different “arms” Each arm forms an elongated valley bounded by faults Two of the arms will succeed and form a spreading center, the other one will fail Continent begins to spread apart through the arms that succeed o New crust is produced at the ridges and accreted to the trailing edge of the plates o Hot spots: mantle upwelling in one place Narrow plume hot material coming up in one hot spot Convergent Boundaries o When two plates are pushing against each other o Continental plate to oceanic plate collision Oceanic plate is thinner The oceanic plate is going to get subducted by the continental plate since it is thinner Trench forms at the subduction form Will run up and down the continental plate Will have a chain of volcanoes parallel to the subduction zone Angle of the subducting plate will determine how far inland the mountain chain will be o Continental to continental collisions Orogeny If compression continues, one will subduct under the other Deformation o Metamorphism o Bend and fold o Faulting This is how plates can be destroyed Sometimes they will come together and movement will stop Foreland basin On other side of thrust belt Down warped area
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