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• W1965590780 endingPage "63" @default.
• W1965590780 startingPage "27" @default.
• W1965590780 abstract "The occurrence of mechanically weak zones (σ1 − σ3 <10 MPa) at upper-, mid- and lower crustal depths, inferred from geological and geophysical observations and interpretations, is supported by empirically-determined steady-state flow properties of some common crystalline rocks. These zones are predicted to occur in the depth intervals 10–15 km, 20–28 km and 25–40 km, these intervals depending critically on rock type and tectonic province. In addition, the apparent widespread occurrence of ductile and semi-brittle fault zones suggests that weak zones may occur at virtually any depth below about 10 km. While data are not available for representative lower crustal materials, those likely to be closest in mechanical response support the common suggestion that the Moho is a mechanical discontinuity, with stronger peridotite below, but the magnitude of the discontinuity is shown to depend critically on temperature and strain rate.Mantle flow is currently best approximated by Chopra and Paterson's (1981, 1984) wet Aheim dunite flow law. Combined with pyroxene thermobarometry and olivine paleopiezometry of mantle xenoliths, the wet flow law permits construction of viscosity-depth profiles that are in accord with other geophysical considerations. Yield envelopes commonly applied to geological and geophysical problems since the original one proposed for the lithosphere and upper asthenosphere by Goetze and Evans (1979) generally lead to serious overestimates of stress differences because of extrapolations both of Byerlee's (1978) rock-friction relation and of steady-state flow laws to physical conditions beyond their range of validity. Modifications of the envelopes, will require careful additional experimental work on rock friction along with detailed delineations of boundaries between brittle, semi-brittle and ductile regimes, grainsize-sensitive domains, and their depth-dependencies. Once accomplished, realistic yield envelopes and refined deformation surfaces will lead to a much better understanding of the mechanical behavior and governing flow processes at depth in the continental lithosphere." @default.
• W1965590780 created "2016-06-24" @default.
• W1965590780 creator A5047509746 @default.
• W1965590780 creator A5085340533 @default.
• W1965590780 date "1987-05-01" @default.
• W1965590780 modified "2023-10-13" @default.
• W1965590780 title "Flow properties of continental lithosphere" @default.
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