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- W65483721 abstract "Permeability and mechanical behavior of carbonates during semi-brittle flowMirna Slim and Brian Evans,Department of Earth, Atmospheric, and Planetary Sciences, Mass. Inst. Tech., Cambridge, MA 02139, USAIn both natural and engineering conditions, carbonate rocks exhibit deformation modes ranging from localizedbrittle fracture to non-localized plastic flow, depending on overburden pressure, deviatoric stress, temperature,strain-rate, pore geometry, and the pressure and chemistry of the pore-fluid. At relatively low temperaturesand confinement, the strength of low porosity carbonates is relatively rate-insensitive, even the deformationmechanism include a mixture of twinning, slip, and local cataclasis, and brittle fracture is generally accompaniedby dilatancy and permeability enhancement. But, in rocks with even modest porosity, non-localized flow caninduce transitions from brittle fracture to compactive flow, and thus, permeability may either decrease with furtherstraining. As temperature is elevated, variations in temperature, strain rate, and pore fluid chemistry also affectthe yield stress, the strain to failure, and the ultimate failure strength. For example in Solnhofen limestone, thestress required for the inception of dilatancy and localization decreases considerably when samples are saturatedwith water. Even when temperature, pressure and strain rate are such that deformation is accommodated byan increasingly large proportion of crystal plastic processes, carbonates with small amounts of porosity stillexhibit a double-surface yield cap. When subjected to triaxial deformation at elevated temperatures, calcite-quartzaggregates with porosity of 20% or less exhibit shear-enhanced compaction. Interestingly and somewhat counterto intuition, the permeability of these rocks deforming under triaxial loads was not as sensitive to porosity changesas that for the same material during isostatic compaction. In addition, the percolation threshold for the triaxiallydeformed material is lower than that during isostatic compaction. The bulk and shear viscosity of these creepingaggregates are functions of both mean and deviatoric stresses." @default.
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- W65483721 date "2010-05-01" @default.
- W65483721 modified "2023-09-24" @default.
- W65483721 title "Permeability and mechanical behavior of carbonates during semi-brittle flow" @default.
- W65483721 hasPublicationYear "2010" @default.
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