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Shear (geology)
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In geology, shear is the response of a rock to deformation usually by compressive stress and forms particular textures. Shear can be homogeneous or non-homogeneous, and may be pure shear or simple she
Boudinaged quartz vein (with strain fringe) showing sinistral shear sense, Starlight Pit, Fortnum Gold Mine, Western Australia
Boudinaged quartz vein (with strain fringe) showing sinistral shear sense, Starlight Pit, Fortnum Gold Mine, Western Australia
Asymmetric shear in basalt, Labouchere mine, Glengarry Basin, Australia. Shear asymmetry is sinistral, pen for scale
Asymmetric shear in basalt, Labouchere mine, Glengarry Basin, Australia. Shear asymmetry is sinistral, pen for scale
Dextral slickenside of pyrite
Dextral slickenside of pyrite
Typical example of dextral shear foliation in an L-S tectonite, with pencil pointing in direction of shear sense. Note the sinusoidal nature of the sh
Typical example of dextral shear foliation in an L-S tectonite, with pencil pointing in direction of shear sense. Note the sinusoidal nature of the shear foliation.
Lineation (geology)
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Lineations in structural geology are linear structural features within rocks. There are several types of lineations, intersection lineations, crenulation lineations, mineral lineations and stretching
Shear (geology)
…mixture of oblique-slip thrust faults and strike-slip or transform faults are formed. Microstructural evidence of transpressional regimes can be rodding lineations, mylonites, augen-structured gneisses, mica fish and so on. A typical example of a transpression regime is the Alpine Fault zone of New Zealand, where…
A gneiss rock exhibiting lineation
A gneiss rock exhibiting lineation
Stretched pebble conglomerate L-tectonite illustrating a stretch lineation within a shear zone, Glengarry Basin, Australia. Pronounced asymmetric shea
Stretched pebble conglomerate L-tectonite illustrating a stretch lineation within a shear zone, Glengarry Basin, Australia. Pronounced asymmetric shearing has stretched the conglomerate pebbles into prolate (cigar-shaped) rods.
L-teconite mylonite formed from coarse-grained sandstone protolith, Glengarry Basin, Australia. This photograph illustrates a pronounced and prominent
L-teconite mylonite formed from coarse-grained sandstone protolith, Glengarry Basin, Australia. This photograph illustrates a pronounced and prominent stretching lineation plunging steeply to the north, as a rake upon the main shear foliation parallel with the protractor. Stretching lineations may form in any faulting regime when conditions are such that rocks deform ductiley, including extensional, compressional, transpressional, and transtensional.