PRE-VENDIAN DISCONFORMITY AND SEDIMENTATION IN THE LATE CRYOGENIAN GLACIATION: STRUCTURAL RELATIONSHIP OF SEDIMENTARY EVENTS IN THE SOUTHWEST OF THE SIBERIAN PLATFORM

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Abstract

The article considers the relationship of deposits and their associations in the lower part of the Early Vendian (Late Cryogenian) Marninskaya Formation of the Oselok Group of the alongside Sayan Ridge sedimentary basin of the Siberian Platform. The main method for comparing genetically diverse deposits is lithofacies analysis and correlation of successive sections linking deposits into systems. In the Late Cryogenian (Early Vendian) glaciation, four stages of sedimentation were stabilised: (1) permafrost and thermokarst, (2) glaciation, (3) initial thawing of the glacier and formation of upper glacier stagnant lakes with aleuro-argillaceous sediments and package of cap dolomites, (4) complete regional thawing of the glacier and formation of glaciofluvial fans. The key elements of correlation were kurum breccias that formed at the first stage as a result of the rise of the paleocontinent and its "dry" freezing, and tillites during its glaciation in the wet stage. Pre-Vendian disconformity has been formed at some studies: a denudation of craton in result of general its denudation, a curum sliping down, termokarst dilution of the Riphean carbonate rocks, exaration by glacier and erosium by glaciofluvial rivers. Deposits of the carbonate platform, which overlap the glaciofluvial fans, are attributed to the eustatic type of the time of the onset of the Ediacaran global deglaciation.

About the authors

Yu. K Sovetov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences

Email: sovetovyk@ipgg.sbras.ru
Novosibirsk, Russia

L. V Solovetskaya

Novosibirsk State University

Email: solovetskayalv@ipgg.sbras.ru
Novosibirsk, Russia

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