Sediment Importance
-
past climates
-
movement of ocean floor
-
ocean circulation patterns
-
high energy
environments à sediment larger
-
well-sorted à
particles in same size classification
Terrigenous(land) / Lithogenous(stone)
-
Mineral composition varies
and reflects the source rock and weathering process
-
Quartz & Clay from
Granite
Biogenous
-
Macroscopic: Shells, bones, teeth
-
Microscopic (abundant
@ upwelling & continental margin): Tests, forms oil & gas
ü Calcareous ooze: CaCO3 à coccolithophores (phyto) & foraminifer (hole
bearer); above CCD
o
Warm & shallow
waters
ü Siliceous ooze: Si àdiatom (phyto) & radiolarian (zoo); below CCD
o
Cold & deep
waters
Authigenic / Hydrogenous
-
Dissolved metals precipitate (chemical reaction)
-
Mn nodules (30% MnO 20% FeO) & Fe-Mn nodules (Nothern Puerto Rico
Trench)
Volcanogenic
Cosmogenous
-
microscopic space dust
& macroscopic meteor debris
-
300,000 metric tons / year
Glacial deposits
-
Poorly sorted
-
Found in the high
latitude of continental shelf
-
Antarctica &
Greenland by ice-rafting.
-
Carry giant boulders
– fine clay
Turbidity Deposits
è underwater avalanches
è
move down continental
slopes
è
carry vast amount of
neritic material
è
spreads out as deep
sea fans, continental rise, and toward abyssal plains
Pelagic
Deposits
-
Spill from turbidite
& slow accumulation of fine-grained material by slow current
Abyssal
Clay
-
2mm growth / 1000
years
-
70% fine clay, red
brown oxidized iron,
-
> 30% biogenous
ooze (alga, protozoa); 6cm growth / 1000 years; depend on rate of
terrigenous sediment accumulation &
surface organism abundance
-
Acidity + high
pressure à High solubility of CaCO3
Calcium
Carbonate Compensation Depth (CCD)
-
Rate calcareous
sediments fall on seabed (below 20%) = sediments dissolved
rate (4500 m)
Petroleum
deposits
à Buried microscopic remains
Gas
Hydrates deposits
à Compact chemical structure (water and natural gas), Eg: methane
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