L07 Ocean basins

L07 Ocean basins - 3 Active v Passive Margins Active...

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GEOL 107 Ͳ L7 9/7/2011 1 What±s on the seafloor? Today±s Topic: Ocean Basins Unexplored Frontiers? Loss of Arctic Sea ice changes geopolitics US (NOAA) and Canada Surveying the Arctic Continental Shelf Echo Sounding Measuring ocean How do we do this? depth Revealing features on the sea floor Bathymetry of the Worlds Oceans Mid Ͳ Ocean ridges Long linear mountain chains Occur in all oceans Fractures perpendicular to ridges Abyssal Plains >4km deep Relatively flat
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GEOL 107 Ͳ L7 9/7/2011 2 Reminder: How Mid Ͳ Ocean Ridges are Formed Sites of spreading, plates diverging New ocean crust created, ocean basins expand young old Seafloor ages Ocean crust cools and sinks as it ages Seafloor depths deep shallow Seafloor depth versus age Ocean crust age in millions of years Ocean crust cools and sinks as it ages Age (Ma) Depth Depth (m) Where are the abyssal plains in this distribution?
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GEOL 107 Ͳ L7 9/7/2011
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Unformatted text preview: 3 Active v. Passive Margins Active Passive Shelf <1km wide Shelf 100s km wide Features: trenches Features: fans, canyons Hazards: earthquakes, volcanoes Active Margins are marked by Trenches TRENCH 1. Numerous trenches in the Pacific Basin Scale of the Mariana Trench Features of a Passive Margin Submarine fans GEOL 107 Ͳ L7 9/7/2011 4 Submarine Canyon at Monterey Source: LDEO:Marine Geoscience Data System Submarine Canyon at Redondo Beach Diving spot just south of the King Harbor Pier ask Prof Jim Haw! Seamounts (submarine volcanoes) Seamounts – also called guyots and atolls – these are all forms of submarine volcanoes Big Wave surfing at the Cortes Bank 100 miles west of San Diego. Seamount that rises to within 20 feet of the surface in many places. Places to learn more http://www.virtualocean.org/...
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L07 Ocean basins - 3 Active v Passive Margins Active...

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