Fluid-rock reaction weakening of fault zones

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August undefined, 2024

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 … WebJul 10, 1995 · Fluid-rock Reaction Weakening of Fault Zones July 1995 DOI: Authors: Robert P. Wintsch Indiana University Bloomington R. Christoffersen AK Kronenberg …

Fault valving and pore pressure evolution in simulations of ... - Nature

Webthis fault zone is weak in an absolute sense, although this remains a controversial issue. ... protolith (thereby allowing enhanced fluid-rock interaction) coupled with the development of a ... WebSep 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 … can rice paper be baked

Comparisons of water and argon permeability in natural …

WebJul 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 … 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 … WebSep 24, 2024 · Fault-zone fluids control effective normal stress and fault strength. While most earthquake models assume a fixed pore fluid pressure distribution, geologists have documented fault... flang spec2017

Ensemble Shear Strength, Stability, and Permeability of Mixed ...

Structural aspects of fluid-rock interactions in detachment zones

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. WebAug 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. flangoo readersWebDec 17, 2009 · We show that fault weakening depends strongly on rock fabric and the distribution of weak phases within a fault zone. flanging tool

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Fluid-rock reaction weakening of fault zones

Evolution of Strength and Permeability in Stressed Fractures with Fluid …

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 … Webthrough 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

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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 … WebLarge normal fault zones are characterized by intense fracturing and hydrothermal alteration. Displacement is localized in a slip zone of cataclasite, breccia and phyllonite …

WebApr 8, 2024 · Key Points At low temperature and pressure, chlorite is weak and velocity-strengthening and hornblende and epidote are strong and velocity-weakening Increasing chlorite content leads to mixtures becoming frictionally weaker and velocity-strengthening 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 … 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 …

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 …

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 flang scrabbleWebDec 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 … flangoo frenchWebJan 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 … flanigan actressWebFeb 4, 2010 · The degree of weakening depends on the thickness of the weak layer. In nature, talc and most other weak minerals (clays and phyllosilicates) are formed by chemical and hydration reactions [ Imber et al., 1997; Jefferies et al., 2006; Schleicher et al., 2006; Collettini et al., 2009b ]. flaniganady4664 outlook.comWebJul 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 … can rice noodles be used in soupWebDec 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. flanigan and byrdWebFeb 1, 2004 · Several studies have focused on fluid-assisted reaction softening and fault weakening during the longterm evolution of fault zones (Caine et al., 1996; Holdsworth, 2004; Collettini et... flanigan and commissioner garfield