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Deep Sea Sedimentation a.Pelagic sedimentation -red clays -brown clays b. Biogenic sedimentation...
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Transcript of Deep Sea Sedimentation a.Pelagic sedimentation -red clays -brown clays b. Biogenic sedimentation...
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Deep Sea Sedimentation
a. Pelagic sedimentation -red clays -brown clays
b. Biogenic sedimentation -calcareous -siliceous
c. turbidites-coarse material in deep ocean
d. Ice rafting
e. Manganese nodules
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From http://www.indiana.edu/~g131/floor3N.html
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Bouma sequences: vertical stacking and lateral continuity of facies…http://www.usask.ca/geology/classes/geol243/243notes/243week4b.html
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Einstein Channel Seismic Facies Show Distinct Partsof a Leveed Channel That Link to Depositional History
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Two Wells Link Sedimentary Character to Seismic Faciesfor the Einstein Channel
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Linear Submarine Channel and Lobe System
A. Smith, 1/99
Channel
Lobe
Small Sinuous Channel
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Sidescan Sonar Shows Amazon Fan Channels Are Highly Sinuous But Not Actively Meandering (Few Cut-Off Loops or Scrolls)
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Youngest Channel Deposits: Massive Turbidite Sands
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Contact between Youngest Channel and Older Channel
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Beaubouef and Friedmann, 2000
Brazos-Trinity Fan
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Beaubouef and Friedmann, 2000
Brazos-Trinity Fan
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Congo RiverSubmarine canyon-
Note sinuous patterni-
in 3000m plus waterDepths!!
from Vittori et al 2000
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Multiple sinuouschannels on thisdeep sea fan….
from Vittori et al 2000
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Popo Channel, Guadalupe Mtns W TexasPopo Channel, Guadalupe Mtns W Texas
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What are Manganese Nodules?
• Ferromanganese nodules are small (typically pea to golf ball sized) deposits that exist in the deep ocean
• They were first discovered on the ocean floor in 1803
• They contain a relatively high percentage of the metals manganese, iron nickel, copper, and cobalt
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What are Manganese Nodules?
• Mn Nodules are formed in situ from of metals and other minerals that have accumulated around a core
• Common core materials include shark teeth, whale bone or meteorite fragment.
• They grow very slowly (~mm/million years) and can be tens of millions of years old.
http://www.ngdc.noaa.gov/mgg/geology/sionar.html
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Composition of Manganese
Nodules
Libes (1992)
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