Shear zone origin of quartzite mylonite and mylonitic pegmatite in the Coyote Mountains metamorphic core complex,Arizona |
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| Institution: | 1. Department of Arctic Geology, University Centre in Svalbard (UNIS), PO Box 156, 9171 Longyearbyen, Svalbard, Norway;2. Eni Norge AS, PO Box 101 Forus, 4064 Stavanger, Norway;3. Department of Geosciences, University of Oslo (UiO), PO Box 1047, Blindern 0316, Oslo, Norway;1. Estación Regional de Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, 83000 Hermosillo, Mexico;2. Posgrado en Ciencias de la Tierra, Estación Regional de Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, 83000 Hermosillo, Mexico;3. Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico;4. Departamento de Geología Regional, Instituto de Geología, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico;1. School of Earth, Atmosphere and Environment, Monash University, Clayton, Victoria 3800, Australia;2. Department of Earth Sciences, University of Gothenburg, SE-40 530, Sweden;3. Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW, 2234, Australia;4. School of Engineering, The University of Newcastle, Callaghan, NSW, 2308, Australia;1. Geology and Petroleum Geology, School of Geosciences, University of Aberdeen, Kings College, Aberdeen, AB24 3UE, UK;2. Technical Resources Unit, Technical Division, INPEX CORPORATION, Tokyo, 107-6332, Japan;3. Resource Exploration Department, PETRONAS, Kuala Lumpur, 50088, Malaysia;1. School of the Environment, Geography and Geosciences, University of Portsmouth, Lion Terrace, Portsmouth, PO1 3HE, United Kingdom;2. İstanbul Technical University, EMCOL Research Centre and Department of Geological Engineering, Ayazağa, 34469, İstanbul, Turkey;3. Helmholtz Centre Potsdam, GFZ German Research Centre of Geosciences, Section 3.6, Telegrafenberg, 14473, Potsdam, Germany;4. Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France |
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| Abstract: | Mylonites derived largely from granite, pegmatite and sedimentary quartzite occupy a 500 m thick, gently N-dipping zone along the northern flank of the Coyote Mountains, west of Tucson, in southeastern Arizona. The quartzite mylonites are exceptionally well developed and occur as discrete layers and lenses, 2–5 m thick, within yet thicker, boudinaged, sill-like lenses of mylonitic pegmatite. Mylonitization took place in the Tertiary within a normal-slip ductile shear zone. The shear zones formed in response to regional extension of continental crust. Extension is along a north-south line, and N-directed sense of shear is revealed by mica fish, oblique foliations in dynamically recrystallized quartz aggregates, and asymmetric quartz c-axis fabrics. The microstructures and c-axis fabrics, taken together, disclose that ductile and brittle deformation was achieved by intense, penetrative, non-coaxial laminar flow dominated by progressive simple shear. |
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