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Glacial Isostasy, Sea-Level, and Mantle Rheology - 9780792311676

Un libro in lingua di NATO Advanced Research Workshop on Glacial Isostasy Sea-level and Mantle Rheology (1990 : Erice Italy) Kurt Lambeck Boschi E. (EDT) Roberto Sabadini E. Boschi North Atlantic Treaty Organization. Scientific Affairs Division (COR) edito da Kluwer Academic Pub, 1991

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by K. Lambeck, R. Sabadini and E. B08Chi Viscosity is one of the important material properties of the Earth, controlling tectonic and dynamic processes such as mantle convection, isostasy, and glacial rebound. Yet it remains a poorly resolved parameter and basic questions such as whether the planet's response to loading is linear or non-linear, or what are its depth and lateral variations remain uncertain. Part of the answer to such questions lies in laboratory observations of the rheology of terrestrial materials. But the extrapolation of such measurements from the laboratory environment to the geological environment is a hazardous and vexing undertaking, for neither the time scales nor the strain rates characterizing the geological processes can be reproduced in the laboratory. General rules for this extrapolation are that if deformation is observed in the laboratory at a particular temperature, deformation in geological environments will occur at a much reduced temperature, and that if at laboratory strain rates a particular deformation mechanism dominates over all others, the relative importance of possible mechanisms may be quite different at the geologically encountered strain rates. Hence experimental results are little more than guidelines as to how the Earth may respond to forces on long time scales.

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