THE HIGH-TEMPERATURE CREEP OF DUNITE.
PRINCETON UNIV N J DEPT OF GEOLOGICAL AND GEOPHYSICAL SCIENCES
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Twenty-two creep experiments were performed on cylindrical specimens of fine-grained polycrystalline dunite. The experiments were conducted in a new, uniaxial compression apparatus at high temperatures, up to 1000C., and differential stresses up to 400 bars at atmospheric pressure. By means of slow heating up and cooling down, it proved possible to prevent crumbing and cracking of the specimens, in the absence of either jacketing or confining pressure. Primary and secondary stages of creep were observed in most of the tests. Temperature, and not axial stress, was found to have the strongest influence on the measured deformations. The investigation established a strong presumption that conditions under which creep deformation takes place in the upper mantle can be investigated in the laboratory with comparatively simple techniques. Author
- Geology, Geochemistry and Mineralogy