ENVIRSC 2E03 Lecture Notes - Lecture 4: Subsidence, Continental Shelf, Plate Tectonics
16 Oct 2018
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Sediemnt and weight of sediment, can cause basin to drop down. Over time, the water level will rise and the sediment needs to continue to drop to allow for the extension of layers of sedimentation. Bottom of the container (basin) is dropping out to continue to accept sediment. Size of container depends on, tectonics, isostacy, and change in sea level. Origin of most basins is related t plate tectonics. Continental drift- earth"s (cid:272)o(cid:374)ti(cid:374)e(cid:374)ts ha(cid:448)e (cid:373)o(cid:448)ed to their prese(cid:374)t positio(cid:374)s after fragmentation of a larger landmass; pangea idea as evidence, same organisms, similar geology of continental areas. Seafloor spreading- ocean basins expand by addition of new rock at spreading centers, a(cid:374)d that older ro(cid:272)k is destroyed (cid:374)ear the (cid:271)asi(cid:374) (cid:373)argi(cid:374)s; earth"s (cid:373)a(cid:374)tle is (cid:272)apa(cid:271)le of flo(cid:449) a(cid:374)d rotation by means of giant thermal convection cells. Plates move 1cm to 7cm a year, causes plates to converge, diverge, or slide past on another.
