10 Marine Sediments Notes
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Transcript of 10 Marine Sediments Notes
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14. Marine Sedimentspages 113-136 in your text
It’s a Wet, Dirty World!
Ya Gotta Love It!!!
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What is Sediment?
Matter that has been deposited by some natural process
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Where does marine sediment come from?
Major Sediment Input to the Oceans-Land
Rivers contribute the mostOther Sources:
Glaciers and ice sheetsWind blown dustCoastal erosionVolcanic debrisGroundwater
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How do we know? We sample!
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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)
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What sediments are found where?
Neritic
Pelagic
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What are the sediment types?
1) Terrigenous - derived from land2) Biogenous - derived from plants and animals3) 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
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1) Terrigenous Sedimentex. Sahara Dust –
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Turbidites – another example of Terrigenous Sediment
Like a landslide, but it happens
under water
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2)
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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!
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Can you find the coccolithophore bloom?
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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:
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3 & 4)
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Evaporites – an example of (3) Hydrogenous Sediment
Form when seawater
evaporates and is not replaced with fresh
water
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Sampling for an example of Hydrogenous Sediment –
Hydrothermal Vents
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Closer to Home…
Long Island – Fire Island Beach Sand is mostly Quartz, Garnet, and Magnetite
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Grain SizesWhat is the name of this equipment?
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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