Plate Boundaries• Time To See Your AdvisorLithospheric PlatesEarth’s structureEarth’s outer shell• Oceanic– Basalt– silica, + iron,magnesium– Higher density• Continental– Granite– More silica, + calcium, sodium– Lower densityRelationship of crust, lithosphere and asthenosphere• http://earth.geol.ksu.edu/sgao/g100/plots/0829_12_litho.jpgEarthquake Locations• http://earth.geol.ksu.edu/sgao/g100/plots/0916_global_seismicity.jpgTectonic Plate Map• Know the names of the 7 major plates, and be able to identify them on a map• http://earth.geol.ksu.edu/sgao/g100/plots/0829_08_plates.jpgBoundaries of plates• Divergent– Constructive– Ridge• Convergent– Destructive– Trench• Transform– Not eitherThree types of plate boundaries• http://earth.geol.ksu.edu/sgao/g100/plots/0829_3boundaries.jpgActive Volcanoeshttp://vulcan.wr.usgs.gov/Glossary/PlateTectonics/Maps/map_plate_tectonics_world.htmlDiverving plate summaryDiverging PlatesIcelandic Rifthttp://earth.geol.ksu.edu/sgao/g100/plots/0829_09_iceland.jpgTransform BoundaryTransform FaultsTransform Fault BoundarySan Andreas Transform Fault• http://earth.geol.ksu.edu/sgao/g100/plots/0829_11_saf_photo.jpgThree types of convergent margins• http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpghttp://vulcan.wr.usgs.gov/Glossary/PlateTectonics/Maps/map_plate_tectonics_cascades.htmlPeru-Chile Trench• http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpgOcean-Continent ConvergenceOcean-Ocean ConvergenceJapan Trench• http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpgLocation of Pacific TrenchesIndia-Asia before collisionHimalayas as a result of collisionContinent-Continent ConvergenceIndian Plate MovementHimalayan Suture• http://earth.geol.ksu.edu/sgao/g100/plots/0829_10_convergent.jpgSummary of convergent platesJuan de Fuca PlateSea-Floor Spreading and Plate BoundariesJuan de Fuca Platehttp://vulcan.wr.usgs.gov/Glossary/PlateTectonics/Maps/map_juan_de_fuca_ridge.htmlPlate MapAnimation link• http://www-personal.umich.edu/~vdpluijm/plates.gifhttp://www.ucmp.berkeley.edu/geology/tectonics.htmlDynamo that creates magnetic field• http://www.nasa.gov/vision/earth/lookingatearth/29dec_magneticfield.htmlMovement of Magnetic North• http://www.nasa.gov/vision/earth/lookingatearth/29dec_magneticfield.htmlMovement of Magnetic pole since 1600s• http://www.geolab.nrcan.gc.ca/geomag/long_mvt_nmp2_e.shtmlApparent Polar wandering for North America and EurasiaPole location with moving continentsMagnetic Reversals in volcanic stratigraphyMagnetic Reversal Age ScaleLava Magnetized in Normal FieldLava Magnetized in reversed fieldLater Lava Magnetized in Normal FieldSea floor spreading documented by magnetic reversalsMagne-tometerSurveyMagnetic AnomaliesAge of Sea Floor• http://earth.geol.ksu.edu/sgao/g100/plots/0829_04_age_of_ocean_floor.jpgEarthquakesLocations and DepthsJapan Trench earthquakesJOIDES ResolutionAge of Emperor Seamount ChainVelocities of PlatesRadio TelescopeWegener’s Pangaea200 mya (early Jurassic)150 mya (late Jurassic)100 million years ago90 mya (Cretaceous)50 mya (early Cenozoic)20 mya (late Cenozoic)Present DayIn 50 million years?In 250 million years??Plate movement over 200
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