Fluid-rock reaction weakening of fault zones

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August undefined, 2024

WebNov 15, 2011 · Here, we show that fault zone structure has an important influence on mixed-mode fault slip behavior. Our field studies depict a complex fault zone structure where foliated horizons surround meter- to decameter-sized lenses of competent material. The foliated rocks are composed of weak mineral phases, possess low frictional … 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.

Fluid-rock Reaction Weakening of Fault Zones

WebMay 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... 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. … portland salvation army

Evolution of Strength and Permeability in Stressed Fractures with Fluid …

Webreaction 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 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 … 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 … optimum puppy dry food

Fracturing and hydrothermal alteration in normal fault zones

Evolution of strength recovery and permeability during

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 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 … optimum reading services scamWebFluid-rock reaction weakening of fault zones. Wintsch, R. P. ; Christoffersen, R. ; Kronenberg, A. K. The presence of weak phyllosilicates may explain the low shear … optimum relaxer professional

"WebFeb 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 ]. " - Fluid-rock reaction weakening of fault zones

Fluid-rock reaction weakening of fault zones

Low‐Temperature Frictional Characteristics of Chlorite‐Epidote ...

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 … 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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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 … 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 ...

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, 2004 · Fluid‐rock reaction weakening of fault zones R. Wintsch, R. Christoffersen, A. Kronenberg Geology 1995 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… Expand 402 View 2 excerpts, …

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 … 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).

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

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 … portland sales tax portland rufcWebLarge normal fault zones are characterized by intense fracturing and hydrothermal alteration. Displacement is localized in a slip zone of cataclasite, breccia and phyllonite … portland schooner co. 1912WebFeb 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... portland schedule boosterWebDec 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... portland salsa and bachata congressWebThe low permeabilities measured support models invoking high fluid pressure weakening of large faults with minimal fluid loss. The stability of structured water films with varying temperature, water pressure and water chemistry may produce a heterogeneous permeability profile with depth in fault zones. optimum re insurance company dallas txWebJan 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 … portland school apartments portland mi