Anisotropic yielding of rocks at high temperatures and pressures; Annual Progress Report, 1988-1989
The experimental results we have obtained on Four-Mile gneiss have demonstrated that the yield behavior of quartzo-feldspathic rocks containing only a small percentage (10%) of mica can be markedly anisotropic, provided the mica minerals exhibit a strong crystallographic preferred orientation. Samples of gneiss oriented such that resolved shear stresses on the foliation plane are large are considerably weaker than granites of similar grain size and composition, and this weakness is attributed to enhanced nucleation of microcracks in quartz and feldspar adjacent to mica grains that are suitably oriented for slip. We expect the yield behavior of rocks containing a higher proportion of phyllosilicates to be influenced by the strongly anisotropic nature of these minerals as well, although the strengths, temperature and pressure dependencies, and flow-controlling mechanisms in such rocks may be significantly different.
- Research Organization:
- Texas A and M Univ., College Station, TX (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG05-87ER13711
- OSTI ID:
- 5269644
- Report Number(s):
- DOE/ER/13711-3; ON: DE90004633
- Country of Publication:
- United States
- Language:
- English
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Anisotropic yielding of rocks at high temperatures and pressures
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Anisotropic yielding of rocks at high temperatures and pressures: Technical progress report No. 2, 16 December 1987--15 December 1988
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Related Subjects
15 GEOTHERMAL ENERGY
152002* -- Geothermal Data & Theory-- Properties of Minerals & Rocks
ANISOTROPY
DEFORMATION
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
FIELD TESTS
FORECASTING
GEOTHERMAL ENERGY
GNEISSES
Geothermal Legacy
MECHANICS
METAMORPHIC ROCKS
PETROGRAPHY
PROGRESS REPORT
RENEWABLE ENERGY SOURCES
ROCK MECHANICS
ROCKS
TEMPERATURE DEPENDENCE
TESTING
152002* -- Geothermal Data & Theory-- Properties of Minerals & Rocks
ANISOTROPY
DEFORMATION
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
FIELD TESTS
FORECASTING
GEOTHERMAL ENERGY
GNEISSES
Geothermal Legacy
MECHANICS
METAMORPHIC ROCKS
PETROGRAPHY
PROGRESS REPORT
RENEWABLE ENERGY SOURCES
ROCK MECHANICS
ROCKS
TEMPERATURE DEPENDENCE
TESTING