Geology 404C Plate Tectonics & Earth History Outline 1

Geology 404C Plate Tectonics & Earth History Outline 1 -...

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    Outline 1   Structure and Composition of the Earth   Average Density 5.5 g/cm 3 Layered , density increases with depth Composition - needed densities                   - meteorites (Fe-Ni and "stony")                   - earthquake waves                   - rare samples (diamond pipes, etc.)   Isostasy  - Floating of lighter on heavier layer in equilibrium .      If disturb equilibrium, then new equilibrium established (isostatic           adjustment)      Implies flow of materials deep within the Earth.   Types of Earth material behavior :      Brittle  (break) - high stress applied fast      Elastic  ("bounce") - low-medium stress applied fast
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     Plastic  (flow) - low-medium stress applied slowly
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Unformatted text preview: examples + where occur within Earth. Continents Oceans Av. Density ~2.7 g/cm 3 ~2.9 g/cm 3 Av. Composition granitic (sialic) basaltic (mafic) Typical Thickness 30-60 km ~5 km (+5 km seds. + H 2 O) Sediment Cover thin-rel. thick (0-16,000 m) rel. thin (0-1,300 m) Average Height ~300 m sea level (high standing) ~5,000 m s.l. (low standing) Age 0-4,000 mill. yrs. (old) 0-185 mill yrs. (young) Stability mostly stable mostly stable Subdivisions shield + platform = craton \slope \rise abyssal plain ridge \trench Back to Outline Main page...
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This note was uploaded on 05/05/2011 for the course GEO 404c taught by Professor Staff during the Spring '08 term at University of Texas.

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Geology 404C Plate Tectonics & Earth History Outline 1 -...

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