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Glacial Isostasy, Sea-Level and Mantle Rheology

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Proceedings of the NATO Advanced Research Workshop, Erice, Italy, July 27-August 4, 1990

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Titel: Glacial Isostasy, Sea-Level and Mantle Rheology
Autoren/Herausgeber: Roberto Sabadini, K. Lambeck, E. Boschi (Hrsg.)
Aus der Reihe: NATO Science Series C
Ausgabe: Softcover reprint of the original 1st ed. 1991

ISBN/EAN: 9789401054928

Seitenzahl: 708
Format: 23,5 x 15,5 cm
Produktform: Taschenbuch/Softcover
Gewicht: 1,098 g
Sprache: Englisch

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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