PALEOZOIC OCEANIC SEDIMENTATION SETTINGS AND FAUNA ASSOCIATIONS AT THE SOUTHERN MARGIN OF THE WEST SIBERIAN PLATE
N.V. Sennikov, K. Iwata*, V.D. Ermikov, O.T. Obut, and T.V. Khlebnikova**
Institute of Oil and Gas Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
* Department of Earth and Planetary Sciences, Hokkaido University, 060, Sapporo, Japan
** Zapsibgeols'emka Federal State Unitary Geological Enterprise, Elan' Village, Kemerovo Region, 654919, Russia
Keywords: Paleoasian ocean, Upper Cambrian-Lower Ordovician Zasur'ya Group, Middle Devonian Karakoitas Formation, Lower Carboniferous Vera-Char Formation, conodonts, radiolarians, Gorny Altai, Rudny Altai, Char zone
Pages: 152-168
Abstract
The geologic structure, geochemistry, lithology, and paleontology of the Late Cambrian-Early Ordovician Zasur'ya volcanosedimentary Group (Gorny Altai) are considered. The geochemical parameters, lithological features, and biomarkers of this unit are indicative of its oceanic genesis. The regularities of the spatial distribution of various facies types of Zasur'ya Group sections are revealed. Eight conodont zones are recognized there. They allow precise dating of the unit. The Gorny Altai sector of the Paleoasian ocean has been proven to exist for about 40 myr. The stratigraphic position of the metamorphic and volcanosedimentary deposits of Rudny Altai is considered. In the Char sector of the Paleoasian ocean, the age positions of the volcanosedimentary units are refined and the stratigraphic levels of oceanic sediments are outlined.
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