(L16)Oceans_E10

(L16)Oceans_E10 - 1 Oceans GLY 2010 – Summer 2010 Lecture...

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Unformatted text preview: 1 Oceans GLY 2010 – Summer 2010 Lecture 16 2 Voyage of H.M.S. Challenger • Route sailed by Challenger from 1872 - 1876 3 Bathymetry 4 Seismic Reflection Profile 5 North Atlantic Ocean 6 Passive Continental Margins • Not located along an active plate boundary • Little or no seismic activity and volcanism • Found mainly in the Atlantic and most of the Indian oceans • Weathering and erosion of continental material produces a wide, thick deposit of undisturbed sediments • The coast of Florida is a passive margin 7 Passive Margin Features • Continental Shelf • Continental Slope • Continental rise 8 Continental Shelf • Gently sloping regions adjacent to continents – about 0.1% on average • Built by transport of sediment from the continents to the ocean Much of this material is felsic, and adds to the offshore region of the continent 9 Continental Shelf • Edge of the continental shelf, at about 130 meters depth (average), is in many ways the true edge of the continent • Continental shelves are much wider on passive margins (Florida) than active margins (Washington, Oregon), and may be non-existent on some margins 10 10 Importance of Continental Shelves • 7.5% of ocean surface, but contain much of the wealth of the oceans, including petroleum, natural gas, mineral resources, and huge sand and gravel deposits • Contain important fishing resources, although these are largely over-exploited and in danger of failure 11 11 Geology of Continental Shelves •...
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This note was uploaded on 07/13/2011 for the course GLY 2010 taught by Professor Warburton during the Summer '07 term at FAU.

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(L16)Oceans_E10 - 1 Oceans GLY 2010 – Summer 2010 Lecture...

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