Sedimentation settings of the Vendian Vanavara formation,the Siberian platform |
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| Authors: | B B Kochnev |
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| Institution: | (1) Institute of Oil-and-Gas Geology and Geophysics, Siberian Division, Russian Academy of Sciences, Novosibirsk, Russia |
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| Abstract: | A model of sedimentation settings is elaborated for siliciclastic deposits of the Vendian Vanavara Formation, the Katanga saddle, inner areas of the Siberian platform. Four lithologic complexes are distinguished in the formation. The lower complex is composed of proluvial continental deposits exemplifying a dejection cone of ephemeral streams. Its eroded surface is overlain by second complex largely represented by sandstones of coastal zone, which grade upward into siltstones and shales of deeper sedimentation settings (third complex). Sea transgression advanced in northeastern direction. The fourth complex resting with scouring on the third one was deposited in settings of a spacious shallow-water sea zone: in a tidal flat, sand shoals and islands. Sedimentological data are used to correlate more precisely the Vendian siliciclastic deposits of the Katanga saddle and northeastern Nepa-Botuoba anteclise, and to verify subdivision of the Vanavara Formation into subformations and character of its boundary with the overlying Oskoba Formation. |
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| Keywords: | Vendian Siberian platform Katanga saddle sedimentation settings correlation |
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