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Determine limiting values for lithospheric stress by applying laboratory-derived rock strength, friction, and ductile flow laws under specified effective principal stresses.

November 10, 1980Journal of Geophysical Research AtmospheresOpen Access

Limits on lithospheric stress imposed by laboratory experiments

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Determine limiting values for lithospheric stress by applying laboratory-derived rock strength, friction, and ductile flow laws under specified effective principal stresses.
Applied Byerlee's linear friction law to model rock friction across pressures exceeding 1 GPa, temperatures up to 500°C, and broad strain rates.
Coupled frictional laws with quartz and olivine ductile flow laws under an assumed geothermal gradient of 15°K/km down to depths of 25 km and 50 km.
Incorporated crystalline rock permeability constraints to assess the role of hydrostatic and subhydrostatic pore fluid pressures.
Byerlee's law provides robust upper and lower bounds for in situ stresses down to 5 km depth under hydrostatic or subhydrostatic pore pressures.
Stress reaches maximum peaks of 600 MPa at approximately 25 km depth for quartz-bearing crust and 1100 MPa at 50 km depth for olivine-bearing lithosphere under hydrostatic conditions.
Differential stress approaches zero at the surface and falls back toward zero at 25 km for quartz and 50 km for olivine due to high-temperature ductile flow.

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Implication

Geomechanical modeling demonstrates laboratory-derived bounds on lithospheric stress across continental crust, indicating that friction and mineral flow laws control crustal strength.

Cite This Study

Brace et al. (1980) studied this question.

synapsesocial.com/papers/69d7c530f39344339dd181cc https://doi.org/10.1029/jb085ib11p06248

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Implication

Geomechanical modeling demonstrates laboratory-derived bounds on lithospheric stress across continental crust, indicating that friction and mineral flow laws control crustal strength.

Limits on lithospheric stress imposed by laboratory experiments

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Limits on lithospheric stress imposed by laboratory experiments

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Implication

Cite This Study

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