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8_sediment distribution - o Seafloor spreading moves...

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8. Sediment distribution Can you? Identify the likely location of biogenic, cosmogenic, authigenic and lithogenic sediment on the global sea floor and predict how this distribution may change as a result of plate tectonics. Explain the presence of the carbon compensation depth (CCD) and demonstrate how to change its depth using sediment delivery. Calculate sedimentation rate. Lecture Outline Global distribution of sediments. o Biogenic sediment distribution is controlled by production & dissolution Carbon compensation depth (CCD)
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Unformatted text preview: o Seafloor spreading moves seafloor to/from sediment sources o Thickest/ oldest sediments at trenches o Sediment differences between oceans • Sediment ‘books’ o Piston cores o Sedimentation rates Problems Demonstrate why at a sedimentation rate of 0.5cm/1000yrs, sediments 1 km thick can accumulate in 200 million yrs (approx. age of oldest oceanic crust.) How thick would the sediments be in Santa Barbara Basin after 10 000 yrs when the sedimentation rate is 140cm/1000yrs?...
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