marine sedimentation l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Marine Sedimentation PowerPoint Presentation
Download Presentation
Marine Sedimentation

Loading in 2 Seconds...

play fullscreen
1 / 29

Marine Sedimentation - PowerPoint PPT Presentation


  • 127 Views
  • Uploaded on

Marine Sedimentation. What is it and where does it come from?. Table 5-1, p. 103. Bottom of the Ocean Floor (Antarctica). How do we know/How do we get it?. Ice samples. River inputs (sedimentation). Atmospheric Inputs. Dust input.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Marine Sedimentation' - chinue


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
marine sedimentation

Marine Sedimentation

What is it and where does it come from?

slide11
Based upon water depth, the ocean environment can be divided into:
    • the shelf
      • shallow and near a terrigenous source
    • the deep ocean basin
      • deep and far from a terrigenous source
slide13
Shelf sedimentation is strongly controlled by:
    • Tides
    • Waves
    • Currents
  • Their influence decreases with water depth.
  • Shoreline turbulence prevents small particles from settling in the shallow water.
  • Particle size decreases seaward for recent sediments.
slide14
Geologic controls of continental shelf sedimentation must be considered in terms of a time frame.
  • For a time frame up to:
    • 1000 years, waves, currents and tides control sedimentation.
    • 1,000,000 years, sea level lowered by glaciation controls sedimentation and cause rivers to deposit their sediments at the shelf edge and onto the upper continental slope.
    • 100,000,000 years, plate tectonics determines the type of margin that develops and controls sedimentation.

4-2 Sedimentation in the Ocean

what s in there
What’s in there?
  • Forams
  • Coccoliths
  • Radiolarians (and other Protozoans)
  • Diatoms and other Phytoplankton (shells)
  • Fecal Pellets and “Dead” things (marine snow)
slide16
Major pelagic sediments in the ocean are red clay and biogenic oozes.

Foraminifera

Diatoms

“Marine Snow”

what do you get
What do you get?

…What geologic structures? and where?

global deep sea deposits
Global Deep-Sea Deposits

Sedimentation Rates

slide27
If influx of terrigenous sediment is low and the water is warm, carbonate sediments and reefs will dominate.

Distribution of Carbonate Shelves

slide28
Deep-sea Sedimentation has two main sources of sediment:
    • External – terrigenous material from the land
    • Internal – biogenous and hydrogenous from the sea.