THE EAST EUROPEAN PLATFORM IN THE LATE EDIACARAN: NEW PALEOMAGNETIC AND GEOCHRONOLOGICAL DATA
N.M. Fedorova, N.M. Levashova, M.L. Bazhenov, J.G. Meert, N.D. Sergeeva, I.V. Golovanova, K.N. Danukalov, N.B. Kuznetsov, A.F. Kadyrov, M.M. Khidiyatov
Keywords: Paleomagnetism, Ediacaran, paleogeography, East European Platform, South Urals
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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