The distribution of stress with depth in the lithosphere; thermorheological and geodynamic constraints

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Authors:Kusznir, N. J.
Author Affiliations:Primary:
Univ. Liverpool, Dep. Earth Sci., Liverpool, United Kingdom
Univ. Durham, United Kingdom
Univ. Liverpool, United Kingdom
Volume Title:Tectonic stress in the lithosphere
Volume Authors:Whitmarsh, R. B., editor; Bott, M. H. P.; Fairhead, J. D.; Kusznir, N. J.
Source:Philosophical Transactions of the Royal Society of London, Series A: Mathematical and Physical Sciences, 337(1645), p.95-110; A Royal Society discussion meeting ; Tectonic stress in the lithosphere, London, United Kingdom, Apr. 10-11, 1991, edited by R. B. Whitmarsh, M. H. P. Bott, J. D. Fairhead and N. J. Kusznir. Publisher: Royal Society of London, London, United Kingdom. ISSN: 0080-4614
Publication Date:1991
Note:In English. With discussion. 31 refs.; illus.
Summary:Two models of lithosphere deformation -- constant strain rate and constant force -- are discussed. Although the constant strain rate model gives a simple method of calculating the horizontal stress- depth relation in the lithosphere, using brittle and plastic failure envelopes, it assumes steady-state deformation which is not viable in stable regions. The constant force model predicts stress amplification in the upper lithosphere due to plastic deformation in the lower lithosphere. The horizontal stress-depth distribution in the continental lithosphere due to tectonic forces is dependent on geothermal gradient and crustal thickness. These factors control the strength of the continental lithosphere. Thermal horizontal stresses in the oceanic lithosphere produced by the constant force model are compressive in the upper lithosphere and tensile below. Other results are discussed. [R.K.H.]
Subjects:Equations; Lithosphere; Mechanics; Mechanism; Plate tectonics; Rheology; Stress
Abstract Numbers:92M/2330
Record ID:1992003416
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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