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8_sediment distribution - Sediment distribution 4 different...

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Sediment distribution 4 different types of sediment: 1. Lithogenic/terrigenous A. Rivers: delivers most terrigenous sediment to ocean in general Grainsize decreases and sorting increases away from continents Only finest grains reach the abyssal plains B. Wind: delivers most terrigenous sediment to middle of ocean/abyssal plains Only very fine gains – iron rusts in dust to produce red clay C. Ice: Delivers coarsest grains to the abyssal plains Poorly sorted and mostly occurs near the high latitudes 2. Authigenic Precipitates out of seawater so Manganese nodules only occur where there is very little sediment deposited (abyssal plains) 3. Cosmogenic Falls everywhere in very small concentrations Best way to find Fe-Ni spherules = magnet + red clay 4. Biogenic (MOR) Production versus dissolution
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Thurman, fig 5-23
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A B C D 1. Region where river delivered sediment is most likely to occur?
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