Handout5

Handout5 - Sediments * Ocean sediments are important...

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Sediments * Ocean sediments are important because (1) they provide a record of ocean basin history, (2) They provide a record of global climate change, (3) they provide a record of bottom physical processes (bottom currents, etc.) * Classifying sediment by particle size: Boulder, cobble, pebble, granule, sand, silt and clay. * For sand-size and coarser grain sediments, the larger the particle, the stronger the current must be to erode the ma- terial. Surprisingly, greater current velocities are required to erode clays (finer sediments), despite their small size, than to erode fine sand. Those fine-particle clays are cohesive and, hence, "stickier" than sand. * Fine-grained sediments suggest low-energy conditions , while coarse sediments suggest high-energy conditions . * Well-sorted sediments indicate energy fluctuations within a narrow range while poorly-sorted sediments indicate energy fluctuations within a wide range. * Sediment types according to sources: terrigenous (derived from land), biogenous (calcareous and siliceous) , cosmogenous , hydrogenous (ex. manganese nodules, evaporites ), volcanogenic
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This note was uploaded on 10/07/2011 for the course OCS 1005 taught by Professor Condrey during the Spring '08 term at LSU.

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Handout5 - Sediments * Ocean sediments are important...

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