Neocrystallization, fabrics and age of clay minerals from an exposure of the Moab Fault, Utah

Solum, John; Pluijm, Ben A. van der; Peacor, Donald R.

doi:10.1016/j.jsg.2005.05.002

Cited by 135 publications

(98 citation statements)

References 35 publications

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“…During seismic slip, ultrafine particles of amorphous material may be produced by comminution, granulation, and mineral lattice distortion (Yund et al 1990;Hirono et al 2014b). Amorphous particles are much more easily dissolved than crystalline grains of equivalent size (Icenhower and Dove 2000), promoting the formation of secondary minerals such as clays by precipitation from fluids in the fault (e.g., Tenthorey et al 1998;Solum et al 2005). However, in the Atera fault, no evidence that such amorphous material existed was observed, so this process is in general likely but could not be confirmed in the Atera fault.…”

Section: Discussionmentioning

confidence: 99%

Heterogeneity in friction strength of an active fault by incorporation of fragments of the surrounding host rock

Kato

Hirono

2016

Earth Planet Sp

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To understand the correlation between the mesoscale structure and the frictional strength of an active fault, we performed a field investigation of the Atera fault at Tase, central Japan, and made laboratory-based determinations of its mineral assemblages and friction coefficients. The fault zone contains a light gray fault gouge, a brown fault gouge, and a black fault breccia. Samples of the two gouges contained large amounts of clay minerals such as smectite and had low friction coefficients of approximately 0.2-0.4 under the condition of 0.01 m s −1 slip velocity and 0.5-2.5 MP confining pressure, whereas the breccia contained large amounts of angular quartz and feldspar and had a friction coefficient of 0.7 under the same condition. Because the fault breccia closely resembles the granitic rock of the hangingwall in composition, texture, and friction coefficient, we interpret the breccia as having originated from this protolith. If the mechanical incorporation of wall rocks of high friction coefficient into fault zones is widespread at the mesoscale, it causes the heterogeneity in friction strength of fault zones and might contribute to the evolution of fault-zone architectures.

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Section: Discussionmentioning

confidence: 99%

Heterogeneity in friction strength of an active fault by incorporation of fragments of the surrounding host rock

Kato

Hirono

2016

Earth Planet Sp

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“…In these localized fault zones, the increased area/volume ratio of rock fragments together with fluid circulation favors high chemical reactivity, allowing retrograde processes to produce fault gouges composed of authigenic hydrosilicates such as illite. Thus, the formation time of the authigenic illite in a fault gouge, can be correlated with periods of motion along the fault and thus constrains the timing of faulting where favorable conditions for illite formation are present (e.g., Lyons and Snellenberg, 1971;Kralik et al, 1987;Wemmer, 1991;Solum et al, 2005;Haines et al, 2008;Zwingmann et al, 2010;Surace et al, 2011;Wolff et al, 2012;Bense et al, 2014). Bense et al (2014) suggested a concept to evaluate the timing of brittle deformation based on K-Ar illite fine-fraction ages from fault gouges, which are developed in non-sedimentary host rocks during retrograde cooling.…”

Section: Fault Gouge Dating and Interpretationmentioning

confidence: 99%

Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Bense

Costa

Oriolo

et al. 2017

andgeo

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ABSTRACT. This paper presents low-temperature thermochronological data and K-Ar fault gouge ages from the Sierra de San Luis in the Eastern Sierras Pampeanas in order to constrain its low-temperature thermal evolution and exhumation history. Thermal modelling based on (U-Th)/He dating of apatite and zircon and apatite fission track dating point to the Middle Permian and the Triassic/Early Jurassic as main cooling/exhumation phases, equivalent to ca. 40-50% of the total exhumation recorded by the applied methods. Cooling rates are generally low to moderate, varying between 2-10 °C/Ma during the Permian and Triassic periods and 0.5-1.5 °C/Ma in post-Triassic times. Slow cooling and, thus, persistent residence of samples in partial retention/partial annealing temperature conditions strongly influenced obtained ages. Thermochronological data indicate no significant exhumation after Cretaceous times, suggesting that sampled rocks were already at or near surface by the Cretaceous or even before. As consequence, Cenozoic cooling rates are low, generally between 0.2-0.5 °C/Ma which is, depending on geothermal gradient used for calculation, equivalent to a total Cenozoic exhumation of 0.6-1.8 km. K-Ar fault gouge data reveal long-term brittle fault activity. Fault gouge ages constrain the end of ductile and onset of brittle deformation in the Sierra de San Luis to the Late Carboniferous/Early Permian. Youngest K-Ar illite ages of 222-172 Ma are interpreted to represent the last illite formation event, although fault activity is recorded up to the Holocene. RESUMEN. Historia de la exhumación y evolución del paisaje de la sierra de San Luis (Sierras Pampeanas, Argentina)-nuevas perspectivas a partir de datos termocronológicos de baja temperatura. Esta contribución presenta datos de termocronología de baja temperatura y edades de illitas generadas en zonas de fallas de la sierra de San Luis, en las Sierras Pampeanas Orientales de Argentina, con el propósito de aportar al conocimiento de la historia de su exhumación y evolución termal de baja temperatura. El modelado termal basado en dataciones de (U-Th)/He, apatita, circón y trazas de fisión sugiere que las principales fases de exhumación y enfriamiento ocurrieron durante el Pérmico medio y Triásico/Jurásico inferior, contribuyendo con aproximadamente 40-50% de la exhumación total registrada por los métodos utilizados. Las tasas de enfriamiento son, en general, bajas a moderadas, variando entre 2-10 °C/Ma durante el Pérmico y Triásico y 0,5-1,5 °C/Ma después del este último período. El lento enfriamiento y la persistente residencia de las muestras analizadas en condiciones térmicas de retención parcial (partial annealing) ha influenciado notoriamente las edades obtenidas. Los datos termocronológicos indican que no ha habido una exhumación 276 Exhumation history and LandscapE EvoLution of thE siErra dE san Luis (siErras pampEanas, argEntina)... significativa después del Cretácico o incluso antes. Consecuentemente, las tasas de enfriamiento durante el Cenozoico, son bajas, ge...

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“…이 같은 결과는 기존의 단층점토를 대상으 로 수행한 연구결과들 (Pevear, 1992(Pevear, , 1999van der Pluijm et al, 2001van der Pluijm et al, , 2006Solum et al, 2005; Haines and van der Pluijm, 2008; Schleicher et (Srodon and Eberl, 1984;Alt and Jiang, 1991;Inoue et al, 1992;Kuwahara et. al., 1998Kuwahara et.…”

Section: 토의 및 결론unclassified

Reactivated Timings of Some Major Faults in the Chugaryeong Fault Zone since the Cretaceous Period

Chung¹,

Song²,

Park³

et al. 2014

Economic and Environmental Geology

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Recently developed illite-age-analysis (IAA) approach has been applied to determine the multiple events for the Singal and Wangsukcheon faults in the Chugaryeong fault belt, Korea. Fault reactivated events during Late Cretaceous to Paleogene events(69.2±0.3 Ma and 27.2±0.5 Ma) for the Singal fault and of 75.4±0.8 Ma for the Wangsukcheon fault were determined by combined approach of the optimized illite-polytype quantification and the K-Ar age-dating of clay fractions separated from the fault clays. These absolute geochronological determinations of the multiple tectonic events recorded in the Chugaryeong fault belt are crucial to establish the tectonic evolution of the Korean Peninsula since Late Cretaceous.

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Neocrystallization, fabrics and age of clay minerals from an exposure of the Moab Fault, Utah

Cited by 135 publications

References 35 publications

Heterogeneity in friction strength of an active fault by incorporation of fragments of the surrounding host rock

Heterogeneity in friction strength of an active fault by incorporation of fragments of the surrounding host rock

Exhumation history and landscape evolution of the Sierra de San Luis (Sierras Pampeanas, Argentina) - new insights from low - temperature thermochronological data

Reactivated Timings of Some Major Faults in the Chugaryeong Fault Zone since the Cretaceous Period

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