Shear bands and related extensional structures in a mylonitized quartz dyke |
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| Affiliation: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;3. Novosibirsk State University, ul. Pirogova 2,Novosibirsk, 630090, Russia;1. Department of Earth Sciences, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada;2. Faculty of Geology and Geography, Tomsk State University, 36 Lenin Ave, Tomsk 634050, Russia;3. University of Toronto, 22 Russell Street, Toronto, ON M5S 3B1, Canada;4. Geological Survey of Canada, Ottawa, ON K1A 0E8, Canada;5. Department of Earth & Ecosystem Sciences, Lund U,Sweden;6. Texas Tech University, 125 Science Building, Lubbock, TX79409-1053, USA;1. Discipline of Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Durban 4000, South Africa;2. Department of Earth Sciences, University of the Western Cape, Bellville 7535, South Africa;3. School of Geosciences, University of the Witwatersrand, Johannesburg 2050, South Africa;1. Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Martí i Franquès s/n, 08028 Barcelona, Spain.;2. Institut de Ciències de la Terra Jaume Almera, ICTJA-CSIC, Lluís Solé i Sabaris s/n, 08028 Barcelona, Spain;3. Department of Earth Science and Engineering, Imperial College London, SW7 2BP, UK |
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| Abstract: | Chiefly monomineralic quartz dykes in the Canigó massif (Eastern Pyrenees) are affected by mylonitic deformation. Deformation took place under low-temperature conditions and produced incipient to well-developed mylonitic foliation. In the deformed quartz, grainsize reduction was mainly achieved by brittle failure of crystals along two conjugate sets of cracks. Two sets of conjugate shear bands are also present even in samples with poorly developed mylonitic foliation. Cracks and shear bands are consistent with an extension parallel to foliation. Both are simultaneously present in all the studied samples. Hydrolytic weakening may have aided the development of ductile structures. |
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