Ocean Sediments. Sedentary = seated or resting A sedentary lifestyle = a lot of sitting around, not much exercise.

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Presentation transcript:

Sedentary = seated or resting A sedentary lifestyle = a lot of sitting around, not much exercise

Ocean Sediments

Sediment core samples from ocean floor

70 % LITHOGENIC (carried by rivers & wind) CLASSIFICATION OF MARINE SEDIMENTS based on Origin … know 4 70 % LITHOGENIC (carried by rivers & wind) Rocks Volcanogenic Cosmogenic 70% of ocean sediment volume 30% BIOGENIC (remains of ocean organisms) Teeth, bones, shells / “tests”, soft tissues Covers ½ of all continental shelves 30% of ocean sediment volume

Thickest deposits … sediments delivered by rivers

Wind (eolian) Sahara Dust (NASA)

VOLCANOGENIC… from volcanos

70 % LITHOGENIC (carried by rivers & wind) CLASSIFICATION OF MARINE SEDIMENTS based on Origin … know 4 70 % LITHOGENIC (carried by rivers & wind) Rocks Volcanogenic Cosmogenic 70% of ocean sediment volume 30% BIOGENIC (remains of ocean organisms) Teeth, bones, shells / “tests”, soft tissues ALGAL BLOOMS Covers ½ of all continental shelves 30% of ocean sediment volume

Biogenic sediments Coccoliths Forams Diatoms Radiolarians

Calcareous ooze components Coccoliths

Calcareous ooze components Forams

Part of the Silaceous ooze Diatom “tests”

Silaceous ooze components Radiolarian tests

Ocean Sediments Calcareous ooze

Algal Bloom (algae) Patagonia coastline