Shear strength, polymorphism, and mechanical behavior of Olivine, Enstatite, Diopside, Labradorite, and Pyrope Garnet :
Tests to 920° C and 60 kb /
R.E. Rieker, T.P. Rooney.
Description
- Language(s)
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English
- Published
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L.G. Hanscom Field, Bedford, Massachusetts : Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, 1966.
- Summary
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Four hundred and seventeen shear and compression tests were completed on five minerals: olivine, enstatite, diopside, labradorite, and pyrope garnet. These minerals are assumed to represent the principal constituents of an upper mantle rock model. Petrographic examination and x-ray analyses indicate that the minerals deform cataclastically at low pressures and temperatures, with intragranular flow beginning at 30 kb normal pressure. Temperature enhances ductility, indicated at high pressures by x-ray line broadening on diffraction patterns and the appearance of kink bands in thin sections. Two phenomena of geophysical importance have been discovered during shear testing: (1) dehydration of less than 5 percent by volume of serpentine weakens dunite by more than 30 percent as the temperature is raised from 300C to 520C; (2) orthorhombic enstatite readily inverts to monoclinic polymorph under the influence of shear stress at all pressures and the temperatures to 920C and 50 kb. The inversion is accompanied by a small, rapid change in volume, sufficient to yield seismic energy for the production of a moderate earthquake. (Author).
- Note
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Terrestrial Sciences Laboratory Project 7639.
AD0642925 (from http://www.dtic.mil).
"August 1966."
- Physical Description
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vii, 57 pages :
illustrations ;
28 cm.
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