10 Marine Sediments Notes


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  • Distribution of pelagic sedimentDominant component Composition Atlantic Pacific IndianTotal % Foraminiferal ooze and nannofossil oozeCalcium carbonate65 365447Pteropod ooze Calcium carbonate20.1- 0.5Diatom oozeSilica (opal)71020 12Radiolarian oozeSilica (opal)-50.53Red (actually brown) clay K, FeAl silicate26492538
  • Check it out in the Metropolitan Museum of Art - 1883
  • 10 Marine Sediments Notes

    1. 1. 14. Marine Sediments pages 113-136 in your text It’s a Wet, Dirty World! Ya Gotta Love It!!!
    2. 2. What is Sediment? Matter that has been deposited by some natural process
    3. 3. Where does marine sediment come from? Major Sediment Input to the Oceans-Land Rivers contribute the most Other Sources: Glaciers and ice sheets Wind blown dust Coastal erosion Volcanic debris Groundwater
    4. 4. How do we know? We sample!
    5. 5. How is marine sediment classified? • Oceanic (AKA Pelagic) – those found in the open ocean (further away from land) • Neritic – those found in waters above continental margins (closer to land) (coastal, “n” for nearshore)
    6. 6. What sediments are found where? Neritic Pelagic
    7. 7. What are the sediment types? 1) Terrigenous - derived from land 2) Biogenous - derived from plants and animals 3) Hydrogenous - formed on or in the sediments on the sea floor (AKA Authigenic) 4) Cosmogenous - particles from outer space See page 119 in your text for a summary of these
    8. 8. 1) Terrigenous Sediment ex. Sahara Dust –
    9. 9. Turbidites – another example of Terrigenous Sediment Like a landslide, but it happens under water
    10. 10. 2)
    11. 11. If the ocean becomes more acidic, organisms with calcium skeletons will be in trouble Coccolithophore subjected to acidic seas – before and after: Corals have calcium shells – imagine a huge worldwide reef die-off!
    12. 12. Can you find the coccolithophore bloom?
    13. 13. Still don’t believe a teeny organism can make sediment? Famous White Chalk cliffs in Etretat France – actually hundreds of millions of coccolithophores! Famous Painting by Monet:
    14. 14. 3 & 4)
    15. 15. Evaporites – an example of (3) Hydrogenous Sediment Form when seawater evaporates and is not replaced with fresh water
    16. 16. Sampling for an example of Hydrogenous Sediment – Hydrothermal Vents
    17. 17. Closer to Home… Long Island – Fire Island Beach Sand is mostly Quartz, Garnet, and Magnetite
    18. 18. Grain Sizes What is the name of this equipment?
    19. 19. Need To Check Your Notes? • Check your details in your text and on these sites: http://www.indiana.edu/~g131/seds.html http://geology.uprm.edu/Morelock/dpseaterrig.htm