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Oblique foliation
Oblique foliation, ''steady state foliation'' or oblique fabric is a special type of a tectonically produced foliation or fabric, most commonly in quartz-rich layers. The microtectonic structure can be used to determine the shear sense in shear zones and their associated rocks, usually mylonites.
== Description of the structure ==
Oblique foliation is mainly encountered in shear zones, where it forms as a result of the shearing deformations within the affected zone. As the name implies, this foliation/fabric takes on an oblique attitude to the shear-zone boundary (i.e. the fabric attractor) and internal layering, usually an angle of about 20°–40°, or less. (In some shear zones, even angles less than 5° are reported, yet angles steeper than 45° are also known). A closer look reveals that the foliation/fabric is created by the parallel arrangement of a multitude of similar oriented small grains, which are slightly elongated in the foliation direction.〔 Means WD. (1981). The concept of steady-state foliation. ''Tectonophysics'', 78:179–199.〕 Oblique foliation thus represents primarily a shape-preferred orientation (SPO).
In their geometrical arrangement, oblique foliations are somewhat similar to (type I) S-C-fabric, in which the elongated grain fabric becomes a true schistosity/foliation. Occasionally mica fish get incorporated into oblique foliations; this structure has been called type II S-C-fabric by Lister & Snoke (1984).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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