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Detrital zircon age and biostratigraphic and chemostratigraphic constraints on the Ediacaran–Cambrian transitional interval in the Irkutsk Cis–Sayans Uplift, southwestern Siberian Platform

Published online by Cambridge University Press:  02 December 2020

Vasiliy V. Marusin Open the ORCID record for Vasiliy V. Marusin [Opens in a new window] ,
Alena A. Kolesnikova ,
Boris B. Kochnev ,
Nikolay B. Kuznetsov ,
Boris G. Pokrovsky ,
Tatiana V. Romanyuk ,
Galina A. Karlova ,
Sergey V. Rud’ko ,
Andrey V. Shatsillo  and
Alexander S. Dubenskiy
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Vasiliy V. Marusin*
Affiliation:
Department of Stratigraphy and Sedimentology, Trofimuk Institute of Petroleum Geology and Geophysics of SB RAS, Akademika Koptyuga Prospect 3, Novosibirsk630090, Russia Department of Geology and Geophysics, Novosibirsk State University, Pirogova Street 1, Novosibirsk630090, Russia
Alena A. Kolesnikova
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia
Boris B. Kochnev
Affiliation:
Department of Stratigraphy and Sedimentology, Trofimuk Institute of Petroleum Geology and Geophysics of SB RAS, Akademika Koptyuga Prospect 3, Novosibirsk630090, Russia Department of Geology and Geophysics, Novosibirsk State University, Pirogova Street 1, Novosibirsk630090, Russia
Nikolay B. Kuznetsov
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia Institute of the Earth’s Crust of SB RAS, Lermontova Street 128, Irkutsk664033, Russia
Boris G. Pokrovsky
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia
Tatiana V. Romanyuk
Affiliation:
Schmidt Institute of Physics of the Earth of RAS, Bol’shaya Gruzinskaya Street 10/1, Moscow123995, Russia
Galina A. Karlova
Affiliation:
Department of Stratigraphy and Sedimentology, Trofimuk Institute of Petroleum Geology and Geophysics of SB RAS, Akademika Koptyuga Prospect 3, Novosibirsk630090, Russia
Sergey V. Rud’ko
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia Institute of the Earth’s Crust of SB RAS, Lermontova Street 128, Irkutsk664033, Russia
Andrey V. Shatsillo
Affiliation:
Institute of the Earth’s Crust of SB RAS, Lermontova Street 128, Irkutsk664033, Russia Schmidt Institute of Physics of the Earth of RAS, Bol’shaya Gruzinskaya Street 10/1, Moscow123995, Russia
Alexander S. Dubenskiy
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia
Victor S. Sheshukov
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia
Sergey M. Lyapunov
Affiliation:
Geological Institute of RAS, Pyzhevsky Lane 7, Moscow119017, Russia
*
Author for correspondence: Vasiliy V. Marusin, Email: marusinvv@ipgg.sbras.ru
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Abstract

A number of ecological and geochemical transformations occurred during late Ediacaran and early Cambrian time, the effects of which are difficult to overestimate. However, the strong linkage of biostratigraphic and chemostratigraphic methods with lithofacies makes the localization of the Precambrian–Cambrian boundary and its correlation with lithologically contrasting sections highly debatable. We analyse the taxonomy and stratigraphic distribution of small skeletal fossils and trace fossils, the carbonate carbon and oxygen isotope composition, and U–Pb detrital zircon age in the Ediacaran–Cambrian transitional interval of the Irkutsk Cis–Sayans Uplift (southwestern Siberian Platform). This interval (Moty Group) comprises a transgressive succession with red-coloured alluvial to deltaic siliciclastic deposits (Shaman Formation) and overlying shallow-marine carbonates (Irkut Formation). The lower Irkut Formation hosts sporadic and poorly preserved tubular Cambrotubulus fossils, which are known from both the terminal Ediacaran Period (c. 550–541 Ma) and the Terreneuvian Epoch (541–521 Ma), and typical Fortunian trace fossils, including an index ichnotaxon of the Cambrian boundary Treptichnus pedum. The biostratigraphic and carbonate carbon isotope data and U–Pb concordia ages of 531.1 ± 5.2 Ma (mean weighted, 530.6 ± 5.3 Ma) of the five youngest zircon grains from the lower Irkut Formation indicate that at least the shallow-marine carbonates of the upper Moty Group correspond to the Cambrian Stage 2 (c. 529–521 Ma). In the Irkutsk Cis–Sayans Uplift, the Cambrian Period tentatively began before or during the accumulation of the alluvial to deltaic siliciclastic Khuzhir and Shaman formations, and this crucial divide remained unmarked in the palaeontological and isotopic records.

Keywords

trace fossilssmall skeletal fossilscarbon isotopesdetrital zirconTerreneuviansouth Siberian Platform

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Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 7 , July 2021 , pp. 1156 - 1172
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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