Oceanographic Sedimentology

 

The ocean's chemical composition is due in part to sediment input from a variety of sources. In this lecture we review the nature of sediments in the ocean, what types are found, where to find them, and in some cases, the economic consequences of them.

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Table of Contents

Title slide

Why study sediments?

Classification of marine sediments can be based upon size or origin.

Classifying Sediment I

Classifying Sediment II

Factors that control sedimentation include particle size and the turbulence of the deposition environment.

Erosion/Deposition curves

Distribution of Sediments

Shelf sedimentation is strongly controlled by tides, waves and currents, but their influence decreases with depth.

Relict sediments

Worldwide distribution of recent shelf sediments by composition is strongly related to latitude and climate.

Carbonate and reef distribution

Geologic controls of continental shelf sedimentation must be considered in terms of a time frame.

North American paleogeography

Deep-sea Sedimentation has two main sources for sediment: terrigenous material from the land and biogenic and authigenic from the sea.

Sediments of Deep-Ocean Basins I

Sediments of Deep-Ocean Basins I

Deep-basin sediment inputs

The distribution of sediments in the deep ocean varies greatly, but is strongly controlled by the compensation depth.

Sedimentation and sea floor spreading

Straigraphy of Pacific sediments

Distribution Of Sediments

Studying Sediments

Clamshell samplers

Deep sea core sampling

An example of core data

Summary

 

Author: Sean Todd

Email: stodd@coa.edu

Home Page: http://www.coa.edu/faculty/webpages/stodd/index.

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