Ocean101-Ch05 - "When I think of the floor of the deep sea the single overwhelming fact that possesses my imagination is the accumulation of

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1 “When I think of the floor of the deep sea, the single, overwhelming fact that possesses my imagination is the accumulation of sediments. I see always the steady, unremitting, downward drift of materials from above, flake upon flake, layer upon layer…For the sediments are the materials of the most stupendous snowfall the Earth has ever seen.” —Rachel Carson, Rachel Carson, The Sea Around Us (1956) See Fig. 5.7, p. 107 Marine Sediments Marine Sediments Based on data from core samples, scientists have determined the age of portions of the Pacific floor, measured in millions of years. * Ocean sediment includes particles from land, from chemical processes, from biological activity, and from space. * Ocean sediment is thickest over continental margins and thinnest over active oceanic ridges. * Sediment deposited on a quiet seafloor can provide a sequential record of recent events in the water column above. Sediments may be recycled into the Earth at subduction zones. * Sediments are an important source of crude oil and natural gas, food materials, and manganese and other economically important materials. Some Important Concepts in Some Important Concepts in Chapter 5 Chapter 5
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2 Marine Sediments Marine Sediments ! What is sediment? ! “Who cares? Who cares? ! Types of sediment – By particle size/texture – By origin/formation ! How is it transported? How is it transported? ! Where is it distributed? What is sediment, and who cares? What is sediment, and who cares? " Sediment = Layers of loose material on ocean bottoms (or elsewhere). “Marine snow”. " Records Earth history (mineral composition, sediment texture). “Forensics”. – Past climate – Age of seafloor – Plate motions – Fossil evolution & extinction All made with diatoms Studying Sediments: Underwater Cameras
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3 Can be used to obtain a relatively undisturbed sediment sample.
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This note was uploaded on 01/09/2012 for the course OCEA 101 taught by Professor Gwynethjones during the Winter '12 term at Bellevue College.

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Ocean101-Ch05 - "When I think of the floor of the deep sea the single overwhelming fact that possesses my imagination is the accumulation of

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