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Now showing items 6419-6438 of 39124
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(PANGAEA, 2004-09-14)
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(PANGAEA, 2005-10-15)
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(2003)Geologic, experimental, and geodetic studies indicate that ductile shear zones do not deform in steady state. We present a theoretical model for an elastically loaded ductile shear zone deforming by combined dislocation ...
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(2001)It is widely believed that grain size reduction by dynamic recrystallization can lead to major rheological weakening and associated strain localization by bringing about a switch from grain size insensitive dislocation ...
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(1999)The Rb-87/Sr-86 and Sr-87/Sr-86 ratios of Laptev Sea sediments, of Arctic Ocean sediments and of suspended particulate matter (SPM) from Siberian rivers (Lena and Khatanga) form 'pseudo-isochrons' due to grain-size separation ...
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(2001)Scaling relationships for grain size-dependent viscosity convection are derived assuming that eutectoid-like transformations at 660 km depth produce very small grains and that the grain size is mainly controlled by a coupled ...
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(2004)In order to examine grain-scale permeabilities in materials that are microstructurally similar to those of the lower crust and upper mantle, we produced porous synthetic quartzites with small fractions of an additional ...
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(1998)Permeability (k) was measured on synthetic, monomineralic aggregates of quartz and calcite, which serve as analogs for texturally equilibrated, fluid- and melt-bearing rocks such as those in the deep crust and mantle. ...
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(1997)We investigate the role of grain-size reduction during the olivine-spinel transformation on rheological properties of subducting slabs on the basis of a scaling model for microstructural development during nucleation and ...
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(PANGAEA, 2006-08-13)
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(2001)Localized shear zones along low-angle normal faults have been identified in regions of extension at the brittle-ductile transition of the continental crust. The possibility of the strain localizing at a depth of 10 km is ...
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(2003)We report the outcome of high-temperature, high-pressure experiments showing that granite can be partially melted and completely recrystallized on a time scale of years as opposed to millennia as widely believed. This could ...
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(1995)Fluid-granite interaction at near-equilibrium conditions was investigated by doping an experimental system with 84Sr. Reactions were performed at 453 K, saturated vapour pressure, and fluidrock ratio of 20. The initial ...
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(1998)We propose an experimental evaluation of the simultaneous dissolution rate of K-feldspar, biotite and plagioclase during the interaction between a granite and a fluid artificially enriched in the less abundant strontium ...
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(2003)The filtration of silicic-alkaline fluid through amphibolite is reproduced experimentally at a temperature of 750°C and a total pressure of 5 kbar, which enables modeling amphibolite granitization in an open system. The ...
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(2004)The filtration of alkali- and silica-bearing solution through amphibolites of various mineral composition and structure was studied at a temperature of 750°C and a total pressure of 5 kbar. The laboratory experiments ...
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(2002)Granitization of rocks in the Archean complex penetrated by the Kola Superdeep Borehole is manifested in the development of nebular, patchy, and unclearly banded migmatites with an age of 2.2 Ga. The amounts of migmatitic ...
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(2001)Natural deformation in carbonate mylonites bearing sheet silicates occurs via a complex interaction of granular flow and solution transfer processes and involves continuous cycles of dissolution, grain boundary diffusion, ...
Now showing items 6419-6438 of 39124