Quartz shape fabric variations and c-axis fabrics in a ribbon-mylonite: arguments for an oscillating foliation |
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| Institution: | 1. U.S. Geological Survey, Alaska Volcano Observatory, 4230 University Dr., Anchorage, AK 99508, United States;2. U.S. Geological Survey, MS 910, 345 Middlefield Rd., Menlo Park, CA 94025, United States;3. Placer Hall, 6000 J Street, Sacramento, CA 95819-6129, United States;4. U.S. Geological Survey, Cascades Volcano Observatory, 1300 SE Cardinal Court, S100, Vancouver, WA 98683, United States;1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, 35131 Padua, Italy |
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| Abstract: | This paper describes quartz ribbons parallel to foliation, containing elongate recrystallized quartz grains aligned oblique to the foliation within a mylonite of the southern Tasman Belt, southeastern Australia. The shape fabric of quartz grains varies in obliquity (with respect to the foliation) and intensity (grain aspect ratio) from one ribbon to another, whereas the c-axis fabric pattern is stable with respect to the mylonitic foliation and lineation. It is argued that the grain shape fabric is an oscillating foliation due to competition between deformation and syntectonic recrystallization. |
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