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State of stress in the lithosphere: Inferences from the flow laws of olivine

Pure and Applied Geophysics PAGEOPH

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DOI: 10.1007/BF01637106

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Abstract

The experimental flow data for rocks and minerals are reviewed and found to fit a law of the form {Mathematical expression} where {Mathematical expression} This law reduces to the familiar power-law stress dependency at low stress and to an exponential stress dependency at high stress. Using the material flow law parameters for olivine, stress profiles with depth and strain rate are computed for a representative range of temperature distributions in the lithosphere. The results show that the upper 15 to 25 km of the oceanic lithosphere must behave elastically or fail by fracture and that the remainder deforms by exponential law flow at intermediate depths and by power-law flow in the rest. A model computation of the gravitational sliding of a lithospheric plate using olivine rheology exhibits a very sharp decoupling zone which is a consequence of the combined effects of increasing stress and temperature on the flow law, which is a very sensitive function of both. ?? 1977 Birkha??user Verlag.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
State of stress in the lithosphere: Inferences from the flow laws of olivine
Series title:
Pure and Applied Geophysics PAGEOPH
DOI:
10.1007/BF01637106
Volume
115
Issue:
1-2
Year Published:
1977
Language:
English
Publisher:
Birkha??user-Verlag
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
245
Last page:
258