_11_Chap5_marine sediments

_11_Chap5_marine sediments - Mighty Mississippi “Old...

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CO 18 Road map today Chap. 5, Marine Seds. Thurs. Fall Break - yeah! Tuesday Chap. 5, Marine Seds. Thurs. Hour test #2 - rats!
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How are marine sediments studied? How are marine sediments sampled? Origins of marine sediments? Why study marine sediments?
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Origins of marine sediments? * Why study marine sediments? *
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* *
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What are origins of marine sediments? *
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Fig. 18.23 Microfossils of Plankton
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Zooplankton
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Zooplankton Planktonic Foraminifera
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Some Benthic Foraminifera too
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Phytoplankton Coccolithophorids
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Phytoplankton Coccolithophorids Calcite plates
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Carbonate Compensation Depth - CCD Major control on calcareous microfossils in the deep sea
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What are origins of marine sediments? *
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Zooplankton Radiolaria high latitude
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Phytoplankton diatoms Siliceous shells frustules equatorial
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What are origins of marine sediments? *
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Origin of terrigenous sediments Weathering
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Fig. 6.5 clear water river turbid river Convergence of a clear water river with turbid river carrying silt & clay
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Fig. 6.4 Deposition of sand as river water loses velocity (energy)
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Unformatted text preview: Mighty Mississippi - “Old Muddy” …sediment transport by a RIVER is key to having a delta! Mighty Mississippi - “Old Muddy” Lena Delta The Lena River, longest river in the Russia, important contributor to Arctic Ocean freshwater and organic carbon budget Natl Geo How do terrigenous sediments get to the deep-sea? Gas hydrates (methane) Fig. 6.38 Modern Depositional Environments Fig. 18.10 Fig. 18.6 Fig. 18.8 Fig. 18.12 Volcanic sediments (terrigenous) Wind-blown dust off Gobi Desert (terrigenous) Wind-blown dust off Sahara-Sahel Desert (terrigenous) Fig. 18.17 Hydrogenous sediments (metalliferous) Fig. 18.19a Fig. 18.18 Low Temperature Hydrogenous sediments Manganese Nodules Manganese Nodules Why study marine sediments? Archive of Earth History Age dating of the sea floor Why study Marine Sediments? warm like today Glacial - cold periods 18 O/ 16 O Earth History - paleoclimatology Ocean History - paleoceanography...
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_11_Chap5_marine sediments - Mighty Mississippi “Old...

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