UT Arlington GEOL 1113 - Isostasy, gravity, magnetism, and internal heat (31 pages)

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Isostasy, gravity, magnetism, and internal heat



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Isostasy, gravity, magnetism, and internal heat

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Pages:
31
School:
University of Texas at Arlington
Course:
Geol 1113 - Quick Site Navigation

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isostasy gravity magnetism and internal heat QuickTime and a TIFF Uncompressed decompressor are needed to see this picture Earth s gravity field isostasy equilibrium of adjacent blocks of brittle crust floating on underlying upper mantle outer layers of Earth divided into 2 based on their strength lithosphere rigid solid outer layer brittle strong crust and uppermost mantle asthenosphere underlying denser heat softened partially melted plastic weak upper mantle DO NOT CONFUSE WITH CRUST AND MANTLE WHICH ARE BASED ON COMPOSITION transition from lithosphere to asthenosphere reflects temperature and rocks response to increased temperature isostasy equilibrium of adjacent blocks of brittle crust floating on underlying upper mantle i e mass above a certain depth must be the same think of wood blocks in water block that sticks up higher also extends farther in water density of wood density of water compensation depth for masses to be the same above the isostatic compensation depth mass in column 1 mass in column 2 masses in both columns in 2 dimensions equal density wood x thickness wood density water x thickness water density water density wood wood that replaces water in the column must be thicker than water it replaces isostasy same concept as wood blocks applies to lithospheric blocks crust and uppermost mantle floating on asthenosphere above the compensation depth continental crust is less dense than oceanic crust crust is less dense than mantle compensation depth mass in column 1 mass in column 2 mass in column 3 density mantle density oceanic crust density continental crust if more mantle in column column will be thinner if more continental crust in column column will be thicker implication is that mountains have roots crust is thicker below them isostasy a more detailed view of density differences include sea water sediments isostasy leads to isostatic adjustment if mass is redistributed crust mantle X A eros ion o f mo unta in note mountain and crustal root below



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