Ductile behavior of a fine-grained porous basalt at room temperature and pressures to 3 GPa

Details Ductile behavior of a fine-grained porous basalt at room temperature and pressures to 3 GPa Ductile behavior of a fine-grained porous basalt at room temperature and pressures to 3 GPa

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..361s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 55, Issue 3-4, p. 361-373.

Physics

5

Scientific paper

A dry fine-grained porous rock (Yakuno basalt with grain size of 0.05-0.4 mm and 7% porosity) was triaxially compressed up to 3 GPa confining pressure at room temperature. The axial differential stress was increased stepwise at fixed intervals. At each step, in the ductile regime of the rock (above 300 MPa confining pressure), the observed strain exhibited time-dependent creep behavior. The linear time-dependent strain was well represented by a power law constitutive equation. The stress exponent had a value of ~ 3 at 1.5 GPa and lower confining pressures, and decreased as confining pressure increased above 1.5 GPa, asymptotically approaching ~ 1. This suggests there is a pressure-induced transition of the cataclastic flow mechanism, even at room temperature. Microstructures showed highly granulated grains in former pore spaces. In the host areas, as well as in the granulated areas, extensive microcrack formation was observed at lower confining pressures but there was less microcrack formation at higher confining pressures. This contrast probably corresponds to the change in the flow mechanism. The equivalent viscosity was estimated as a function of differential stress and strain rate.
Present address: Geological Survey of Japan, Tsukuba 305, Japan.

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