OCS 1005 Lecture : Lecture 9
15 Mar 2019
School
Department
Course
Professor
Document Summary
Lockett hall, room 05, wednesday september 12, 5:00 7:00 pm. Sediment is particles of organic or inorganic matter that accumulate in a loose, unconsolidated form. Sediment may be classified by grain size or by the origin of the majority of the particles. The distribution and average thickness of marine sediments. Rate of sedimentation is almost always higher on continental shelves than in the deep ocean. Shelves are closer to terrigenous sources and usually high in biological productivity (source of biogenous sediments). The ages of portions of the pacific ocean floor, based on core samples of sediments just above the basalt seabed, in millions of years ago (ma, mega- annum). The youngest sediments are found near the east pacific rise; and the oldest, close to the eastern side of the trenches. Over geological time, mountains rise as lithospheric (crustal) plates collide, fuse, and subduct. Water and wind erode the mountains and transport resulting sediment to the sea.
