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Book Chapter

The glaciogenic Bol'shoy Patom Formation, Lena River, central Siberia

By
Nickolay M. Chumakov
Nickolay M. Chumakov
Geological Institute Russian Academy of Sciences, Pyzhevskiy 7, Moscow 119017, Russia
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Boris G. Pokrovsky
Boris G. Pokrovsky
Geological Institute Russian Academy of Sciences, Pyzhevskiy 7, Moscow 119017, Russia
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Victor A. Melezhik
Victor A. Melezhik
Geological Survey of Norway, Leiv Eirkssons Vei 39, N-7491 Trondheim, Norway
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Published:
January 01, 2011

Abstract

The Bol'shoy Patom Formation (Fm.) is part of the Upper Precambrian Patom Supergroup, which comprises a siliciclastic and carbonate succession divided into (from base to top) the Ballaganakh, Dal'nyaya Tayga and Zhuya Groups (Gr.). The supergroup was deposited within the bay-like passive margins of the Siberian craton. The Bol'shoy Patom Fm. is the lower unit of the Dal'nyaya Tayga Gr. Massive and stratified diamictites with subordinate sandstones, mudstones, siltstones, conglomerates and conglo-breccias form the Bol'shoy Patom Fm. New biostratigraphic (microfossils of Pertatataka type, Ediacaran fossils) and chemostratigraphic data (87Sr/86Sr, δ13C) point to a Vendian (Late Cryogenian and Ediacaran) age for the Dal'nyaya Tayga and Zhuya Groups. Unsorted diamictite matrix, a very wide range of size and roundness of dispersed erratic clasts, the presence of glacial grooves on boulders, dropstones and till pellets in laminated mudstones and siltstones are all evidence for intense ice rafting and ice-shelf sedimentation in the northeastern part of the Patom basin during deposition of the Bol'shoy Patom Fm.

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Contents

Geological Society, London, Memoirs

The Geological Record of Neoproterozoic Glaciations

Emmanuelle Arnaud
Emmanuelle Arnaud
University of Guelph, Canada
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Galen P. Halverson
Galen P. Halverson
McGill University, Canada
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Graham Shields-Zhou
Graham Shields-Zhou
University College London, UK
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Geological Society of London
Volume
36
ISBN electronic:
9781862394117
Publication date:
January 01, 2011

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