ENVIRSC 2E03 Lecture Notes - Lecture 9: Oceanic Basin, Geoid, Plate Tectonics
16 Oct 2018
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Document Summary
Eustacy sea level change: global sea level average. Reconstructing sea level from stratigraphic record is a function of: water volume, changing shape of basin that holds the water, stability of the sides of the basin- coastlines or land surface, distribution of the water in the basin. Balance between quantity of water on land vs the oceans. Long tem sl change affects the shape and extent (volume) of the oceanic basins: plate tectonics- convergence subduction of crustal plates, variation in ocean spreading rates, continental breakup and accretion. Filling of ocean basins with sediments derived from continental weathering is a. Earth"s interior- displacements of deep materials with different densities. Geoid of the earth: defined as sl surface encompassing the globe as if it extended continuously that is perpendicular at every point to the direction of gravity. Geoid reflects gravity field anomalies and is therefore not spherical. Land-level changes: areas close to ice load will be affected.
