earth sci - geology of oceans

earth sci - geology of oceans - Earth Science Lectures...

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Earth Science Lectures – Geology of the Oceans The Oceans -cover 71% of the earth’s surface average depth 3,711m----max. depth 10,923m -saline water – 35ppt -sea bottom continental shelf/slope abyssal plains (40% earth’s surface) deep sea trenches mid-ocean ridges Thin Ocean Crust -basalt (comes out of volcanoes, viscous, high temp, dark) composition -6km on average, basalt -lithosphere underneath -upper mantle (plastic) below that Mid-Ocean Ridges -basaltic volcanism -shallow earthquakes -thinnest crust -broad mountains with rift valleys at crest -increasing sediment cover away from crest -high heat flow -Iceland (example of where mid-ocean ridge is above sea level) Transform Fault -offset mid-ocean ridges and all features of ridges -shallow and medium depth earthquakes -shear -most intense where: -near ridges -run under continents -perpendicular to ridges Magnetic Anomalies -pattern of normally and reversely polarized crust -in stripes -stripes parallel mid-ocean ridges -stripe widths, shapes, and intensities symmetrical about ridge crest
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This test prep was uploaded on 04/18/2008 for the course GEO EarthSci taught by Professor Graves during the Winter '07 term at Dalhousie.

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earth sci - geology of oceans - Earth Science Lectures...

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