The East European Platform in the late Ediacaran: new paleomagnetic and geochronological data |
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Authors: | NM Fedorova NM Levashova ML Bazhenov JG Meert ND Sergeeva IV Golovanova KN Danukalov NB Kuznetsov AF Kadyrov MM Khidiyatov |
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Institution: | 1. Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;2. Department of Geological Sciences, University of Florida, 274 Williamson Hall, Gainesville, FL 32611, , United States;3. Institute of Geology, Ufa Science Center, Russian Academy of Sciences, ul. Karla Marksa 16/2, Ufa, 450000, Russia |
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Abstract: | The paleogeography of the Earth, including the East European Platform, is very inaccurately defined for the interval 500–700 Ma. The quantity and quality of Late Precambrian–Cambrian paleomagnetic data on this platform are absolutely insufficient for reliable paleogeographical or paleotectonic reconstructions. Since there are almost no unstudied objects in the platform that could be used for paleomagnetic studies, it seems reasonable to consider the deformed platform margins. Of particular interest is the Bashkir anticlinorium (South Urals) with numerous Ediacaran sedimentary sections, some of which contain tuff beds suitable for isotope dating. We present paleomagnetic and geochronological data on the Upper Ediacaran Zigan Formation, sampled in the western part of the western limb of the Bashkir anticlinorium. The East European Platform must have been at near-equatorial latitudes at ~550 Ma. |
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