Fluid-rock reaction weakening of fault zones

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August undefined, 2024

WebAug 20, 2014 · Fluid-rock reaction weakening of fault zones Journal Article Wintsch, R ; Christoffersen, R ; Kronenberg, A - Journal of Geophysical Research The presence of … WebDec 1, 2024 · The presence of weak phyllosilicates may explain the low shear strengths of fault zones if they define well-developed fabrics. The growth of phyllosilicates is favored in meteoric water-dominated granitic fault systems, where mineral-aqueous fluid equilibria predict that modal phyllosilicate will increase via feldspar replacement reactions. In …

Fluid-rock reaction weakening of fault zones (1995) Robert P.

WebMetamorphic core complexes and associated detachment faults of the North American Cordillera represent gently dipping, normal-displacement shear zones (detachment zones) along which hot, deeper levels of the crust were transported upward and outward from underneath a brittlely distended upper plate. Structures that formed during the ductile-to … WebJan 30, 2003 · The experiments presented here show that isostatic hydrothermal reaction of fault products formed in previously intact rock can result in significant strengthening of fault zones. Strength recovery of our experimental fault zones was achieved by compaction of gouge material and healing of crack arrays that were formed during initial … css position div at top of parent div

Deformation processes and weakening mechanisms within the …

Webwhere c is the concentration of an element in rock or fluid (mass%). The initial δ rock 0 value can be obtained by the analysis of fresh, unaltered rock, whereas the final δ rock … Webabstract. The presence of weak phyllosilicates may explain the low shear strengths of fault zones if they define well-developed fabrics. The growth of phyllosilicates is favored in … WebJan 10, 2024 · A modified slip-weakening constitutive law is applied at contacts. We perform velocity-stepping experiments on both uniform and layered mixtures of quartz and talc analogs. We separately vary the proportion of talc in the uniform mixtures and talc layer thickness in the layered mixtures. css position coordinates

(PDF) Planetary science. Weak faults--rotten cores - ResearchGate

Fault valving and pore pressure evolution in simulations of

WebFeb 4, 2010 · 1. Introduction [2] The apparent weakness of mature faults with large offsets (>5 km) and the state of stress in the Earth's crust have long been a matter of debate. … WebMay 13, 2015 · We determine the evolution of frictional strength, strain weakening behavior and permeability in fractures subject to dissolution and precipitation. We establish these relations through slide–hold–slide experiments, with hold times from 10 to 3000 s, on split limestone core, under hydraulically open and closed conditions. Fracture friction and … earls of devon listWebMay 13, 2015 · Chemical reactions between the fluid and rock mass lead to erosion in the mineral particles and crystals, weakening of the particle bond strength, and changes in the mineral components... css position div on top of another div

"WebDec 1, 2005 · In both fault types, early cataclasis facilitates fluid influx into the active fault zone, leading to widespread alteration of the crushed material (reaction softening) and simultaneously... " - Fluid-rock reaction weakening of fault zones

Fluid-rock reaction weakening of fault zones

Evolution of strength recovery and permeability during fluid–rock ...

WebMay 15, 2000 · The Great Glen Fault Zone (GGFZ) is a major, reactivated strike‐slip fault within the lower Paleozoic Caledonian orogenic belt of the British Isles. The Late Devonian to Tertiary reactivation history… Expand 60 PDF Save Alert Low effective fault strength due to frictional-viscous flow in phyllonites, Karakoram Fault Zone, NW India WebLarge normal fault zones are characterized by intense fracturing and hydrothermal alteration. Displacement is localized in a slip zone of cataclasite, breccia and phyllonite …

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WebDec 1, 2024 · The growth of phyllosilicates is favored in meteoric water-dominated granitic fault systems, where mineral-aqueous fluid equilibria predict that modal phyllosilicate will … WebAug 1, 2014 · Fault rocks contain graphite veins and cement that locally constitute >50% of the rock. Individual graphite veins are as much as 1 cm wide, and are locally almost pure graphite, with minor muscovite and anatase. Hydrothermal graphite grain size (10–500 µm) is substantially greater than background metamorphosed organic matter (∼1 µm).

WebFluid-rock reaction weakening of fault zones. Wintsch, R. P. ; Christoffersen, R. ; Kronenberg, A. K. The presence of weak phyllosilicates may explain the low shear … WebJan 30, 2003 · The experiments presented here show that isostatic hydrothermal reaction of fault products formed in previously intact rock can result in significant strengthening of …

WebJul 10, 1995 · Fluid-rock Reaction Weakening of Fault Zones July 1995 DOI: Authors: Robert P. Wintsch Indiana University Bloomington R. Christoffersen AK Kronenberg … WebDec 17, 2009 · We show that fault weakening depends strongly on rock fabric and the distribution of weak phases within a fault zone.

WebJan 30, 2003 · The experimental results show how hydrothermal reactions in fault zones may lead to two competing, time-dependent effects; fault strengthening due to increased …

WebDec 17, 2009 · Explanations for fault weakness include the presence of weak minerals, high fluid pressures within the fault core and dynamic processes such as normal stress reduction, acoustic fluidization or extreme weakening at high slip velocity. css position div at bottom of divWebAug 10, 2024 · Extensive fluid–rock reaction can produce layers of phyllosilicates, which can significantly weaken fault zones, as discussed below (e.g. Wintsch et al. 1995; Imber et al. 1997). A second difficulty in applying Byerlee's Law to the Earth relates to the composition of fault rocks. css position div within divWebthrough a process of reaction weakening. Fluid-rock ... [1993] suggest that fluids penetrated the studied ancient fault zones throughout th• slip history and opisodic flow may css position fixed居中WebSep 24, 2024 · Nature Communications - Coupling between fault zone fluid flow, permeability evolution, and elastic stress transfer produces fault valving and fluid-driven … css position:fixedWebJul 10, 1995 · Abstract. The presence of weak phyllosilicates may explain the low shear strengths of fault zones if they define well-developed fabrics. The growth of phyllosilicates is favored in meteoric water-dominated granitic fault systems, where mineral-aqueous fluid … earls of derbyWebSep 15, 2014 · The development of foliated cataclasis enriched in mica leads to strain weakening of fault zone through a decrease of the friction coefficient from 0.6 to 0.1 with strain (Collettini et al., 2009, ... Fluid–rock reaction weakening of fault zones. J. Geophys. Res., 100 (B7) (1995), pp. 13,021-13,032. Google Scholar. Cited by (0) View … earls of derby family treeWebreaction weakening of fault zones In the absence of direct observations of high fluid pressure in active fault zones in crystalline rocks, the effects of fluids css position fixed overflow