OCS 1005 Chapter : Chapter 5
15 Mar 2019
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Can classify sediments from: source, shape, size, composition, distribution, origin, ** test question: pay attention to what scheme its under. Deep sea cores: sediments deposited much more deeply, can tell us about climate, can age date it and see how things have changed, glaciers have a lot of layers. Sub bottom profiler: some have internal structure, outside are sediments that have washed down margin. Louisiana has a lot of silt and clay. Origins: hydrogenous: precipitated out of water, cosmogenous: from outer space, lithogenous, good place to look would be big rivers; pretty much broken down continental rock. Nertic: mainly continental souce, 1m per year, 75% of marine sediment. Oceanic: deep ocean deposits, fine grain material, palagic, clays, oozes, hemipelagic, continental rise, larger size. Dissolution rate: silica is well preserved in deep sea, takes along time to fall, calcium carbonate, dissolves, shouldn"t find any oozes in deep ocean, should only see silica ones.
