Sea Floor TectonicsScotts Mills 2006 April 26, 7:24 AMAtlantic oceanic ridgePassive Continental MarginPassive continental Margin—locationPassive continental Margin—cross sectionDeep sea sediment fansTurbidity currentDiscovery of Turbidity CurrentsSea-floor landforms—CaliforniaActive Continental MarginsActive continental Margin—locationActive continental Margin—cross sectionDeep-Ocean TrenchesAtlantic Ocean FloorPacific and Indian Ocean FloorKaikoChallenger Deep shrimpConvergent Lithospheric PlatesAtoll formationAtollOceanic PlateausAlvinOceanic Ridge--AtlanticOceanic Ridge—IndianOceanic Ridge—PacificOceanic plate divergenceRift valleys on oceanic ridgesFormation of Black SmokerBlack Smoker with tube wormsPacific Lithosphere ActionOffshore oil platformMethane Hydrate sampleMethane Hydrate burningSalt productionManganese NodulesSea Floor TectonicsEarth ScienceChapter 13, p. 164-174Scotts Mills 2006 April 26, 7:24 AM• Magnitude 3.0• Depth 19 kmhttp://pasadena.wr.usgs.gov/shake/pnw/STORE/X4261424_06/ciim_display.htmlAtlantic oceanic ridgePassive Continental Margin• Continental shelf• Continental slope• Continental risePassive continental Margin—locationPassive continental Margin—cross sectionDeep sea sediment fansTurbidity currentDiscovery of Turbidity CurrentsSea-floor landforms—CaliforniaActive Continental Margins• Narrow continental shelf• Deep sea trench catches terrigenous sediment• ‘Accretionary Wedge’Active continental Margin—locationActive continental Margin—cross sectionDeep-Ocean Trenches• Active continental margins• Other convergent plate locations• Most are in the Pacific OceanAtlantic Ocean FloorPacific and Indian Ocean FloorKaiko•ROV• 10,990 m• 1995Challenger Deep shrimphttp://www.mext.go.jp/english/news/1998/07/980705.htmConvergent Lithospheric Plates• Oceanic plate is subducted• Deep-ocean trench is formed• Volcanism above subducted plateAtoll formationAtollOceanic Plateaus• Figure 10-19—Oceanic PlateausAlvin• Manned• 4000 m maximum depthOceanic Ridge--AtlanticOceanic Ridge—IndianOceanic Ridge—PacificOceanic plate divergencehttp://www.soc.soton.ac.uk/CHD/classroom@sea/carlsberg/science/constructive_margins.htmlRift valleys on oceanic ridgesFormation of Black Smokerhttp://www.paedquest.de/Riff_Tiefsee_Mangroven_neu/tiefsee/content/geobsm01.htmlBlack Smoker with tube wormshttp://www.pbs.org/wgbh/nova/abyss/life/extremes2.htmlPacific Lithosphere Actionhttp://www.soc.soton.ac.uk/CHD/classroom@sea/carlsberg/science/oceanic_constr.htmlOffshore oil platformMethane Hydrate sampleMethane Hydrate burningSalt productionManganese
View Full Document
Unlocking...