The orientation of paleomagnetic directions of deformed Carboniferous rocks from the Zaysan Depression (Eastern Kazakhstan) |
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| Institution: | 1. School of Earth Sciences, The University of Western Australia, Perth, WA 6009, Australia;2. Geological Survey of Western Australia, 100 Plain Street, East Perth, WA 6004, Australia;3. Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark;4. Swedish Museum of Natural History, Box 50 007, SE-104 05 Stockholm, Sweden;1. Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;2. Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China;1. Graduate Program in Geology, Institute of Geosciences, Federal University of Bahia (UFBA). Rua Barão de Geremoabo, s/n, Federação, 40170-209, Salvador, Bahia, Brazil;2. Institute of Geosciences, Federal University of Bahia (UFBA). Rua Barão de Geremoabo, s/n, Federação, 40170-209, Salvador, Bahia, Brazil |
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| Abstract: | We present new paleomagnetic data on Carboniferous volcano-sedimentary rocks from a section located in the northern part of Zaysan Depression (Narym Zone, Eastern Kazakhstan) which are transformed by shear deformation to different degrees. These data suggest that rocks which have experienced shear acquire magnetization whose orientation coincides with the deformation surface (e.g. cleavage etc.). Moreover, it is shown that in steeply inclined strata deformational processes resulted in the shallowing of inclination of the paleomagnetic vectors in stratigraphic coordinates so that finally the characteristic directions may be completely reoriented parallel to the bedding surface. No noticeable mechanical reorientation of mineral grains was observed in deformed rocks both with old paleomagnetic directions deflected away from the original position and with new paleomagnetic directions acquired due to deformation as well (brittle deformation). |
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