Conjugate Riedel deformation band shear zones

Davis, George H.; Bump, Alexander P.; García, Pilar Elena; AHLGREN, STEPHEN G.

doi:10.1016/s0191-8141(99)00140-6

Cited by 202 publications

(97 citation statements)

References 18 publications

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“…As seen in other Riedel systems (e.g. Morgenstern & Tchalenko 1967) the system at Sheets Gulch displays a remarkable scaleinvariance and self -similarity over at least three orders of magnitude (Davis 1996, Ahlgren 1999 (Figure 4). For example, regional -scale DBSZs may be interpreted as large -scale Riedel shear zones, sub -bands within the DBSZs often exhibit a Riedel geometry, and these bands, in turn, may be Riedel shear zones.…”

Section: Structural Geometrysupporting

confidence: 55%

“…This study examines the sequential development of outcrop -scale Riedel shear zones composed of deformation bands (Davis 1996) Moving up-gradient along the PRZ (e.g. Figure 5), Z1 bands typically assume a gently curved, sigmoidal geometry in plan view, and a single Z1 band may exhibit a 13° -43° angular discordance between the strike of one its free tips and the strike of its interior region.…”

Section: Outcrop Scale Structurementioning

confidence: 99%

“…Overstep regions are defined as discrete, roughly orthorhombic regions where there is spatial overlap between pairs of deformation bands (commonly Z3 bands) or band systems (PRZs or PSZs) (Davis 1996). In situations where Z3 bands do overlap spatially, however, Z4 bands are present and act as hard links between the Z3 bands.…”

Section: Geometry Of Overstep Regionsmentioning

confidence: 99%

“…Tchalenko & Ambraseys 1970, Moore 1979, Moore & Byerlee 1992) to outcrop -scale (e.g. Dengo & Logan 1979, Davis 1996 to thin section -scale (e.g. Morgenstern & Tchalenko 1967, Tchalenko 1968, Maltman 1987).…”

Section: Introductionmentioning

confidence: 99%

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The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

AHLGREN

2001

Journal of Structural Geology

109

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Section: Structural Geometrysupporting

confidence: 55%

Section: Outcrop Scale Structurementioning

confidence: 99%

Section: Geometry Of Overstep Regionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

AHLGREN

2001

Journal of Structural Geology

109

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“…Tchalenko 1970) should develop within the shear zone centered along the strike of the tiger stripe. Experimental modeling work on clays and sand (Tchalenko 1970;Wilcox et al 1973;Naylor et al 1986;Davis et al 2000) show that the R, R′, and P-shears are typically arranged in an evenly spaced en echelon pattern. The resulting evenly spaced en echelon fractures may terminate in local openings (cf.…”

Section: Spacing Of Geysersmentioning

confidence: 99%

Enceladus’ Geysers: Relation to Geological Features

Helfenstein

Porco

2015

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We apply histogram analysis, photogeological methods, and tidal stress modeling to Porco et al.ʼs survey of 101 Enceladus South Polar Basin geysers and their three-dimensional orientations to test if the jet azimuths are influenced by their placement relative to surface morphology and tectonic structures. Geysers emplaced along the three most active tiger stripe fractures (Damascus Sulcus, Baghdad Sulcus, and Cairo Sulcus) occur in local groupings with relatively uniform nearest-neighbor separation distances (∼5 km). Their placement may be controlled by uniformly spaced en echelon Riedel-type shear cracks originating from left-lateral strike-slip fault motion inferred to occur along tiger stripes. The spacing would imply a lithosphere thickness of ∼5 km in the vicinity of the tiger stripes. The orientations of tilted geyser jets are not randomly distributed; rather their azimuths correlate with the directions either of tiger stripes, cross-cutting fractures, or else fine-scale local tectonic fabrics. Diurnal tidal stress modeling suggests that periodic changes of plume activity are significantly affected by crosscutting fractures that open and close at different times than the tiger stripes that they intersect. We find evidence of sub-kilometer scale morphological modification of surface geological features surrounding geysers from sublimation-aided erosion, and ablation, and scouring. We propose that the simultaneous crushing and shearing action of periodic transpressional tidal stress on ice condensing on the inside walls of geyser conduits is the mechanism that extrudes the peculiar, paired narrow ridges known as "shark fins" that flank the medial tiger stripe fissures. We present a gallery of high-resolution image mosaics showing the placement of all the jets in their source region and consequently their geological context.

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Development of branching brittle and ductile shear zones: A numerical study

Meyer

Kaus

Passchier

2017

Geochem Geophys Geosyst

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Continental collision zones are usually associated with large‐scale strike‐slip shear zones. In most cases, these shear zones are complex and consist of multiple strands, varying in width, length, and total displacement. Here we present 2‐D numerical models to simulate the formation of such shear zones at different depth levels within the crust, under either brittle (frictional/plastic) or ductile conditions. Localization of shear zones is initiated by a material contrast (heterogeneity) of the material parameters. We systematically test the rate of strain weakening in brittle and in ductile regimes to understand its influence on the development of shear zone networks. Our simulations suggest that the development of antithetic faults in a brittle shear zone system is closely linked to a decrease in the angle of friction during deformation. In general, variation of the strain weakening also has a significant influence on ductile shear zones. Numerical results show that the geometry and thickness of the localized high strain zone are especially affected by weakening mechanisms during deformation. Furthermore, the interconnection and interaction of the shear strands lead to a more complex kinematic pattern, which lead to a local change in the maximum principal stress axis. These interaction of shear strands may explain the occurrence of shear‐related structures (e.g., folds) or differing characteristics of shear zones, such as the thickness of shear zones or the orientation of the faults to the stress field, which are consistent with field observations.

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Conjugate Riedel deformation band shear zones

Cited by 202 publications

References 18 publications

The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

The nucleation and evolution of Riedel shear zones as deformation bands in porous sandstone

Enceladus’ Geysers: Relation to Geological Features

Development of branching brittle and ductile shear zones: A numerical study

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