TY - JOUR

T1 - Sturtian glaciation in Siberia: Evidence of glacial origin and U-Pb dating of the diamictites of the Chivida Formation in the north of the Yenisei Ridge

AU - Rud`ko, Sergey

AU - Kuznetsov, Nikolay

AU - Shatsillo, Andrey

AU - Rud`ko, Dmitry

AU - Malyshev, Sergey

AU - Dubenskiy, Alexander

AU - Sheshukov, Viktor

AU - Kanygina, Nadezhda

AU - Romanyuk, Tatiana

N1 - Funding Information: The work is supported by the Ministry of Science and High Education of the Russian Federation (grant No 075-15-2019-1883) and by Russian Foundation of Basic Research (grant No 19-05-00794).

PY - 2020/8

Y1 - 2020/8

N2 - Knowledge on the age and distribution of glacial deposits is essential in order to solve issues surrounding the geological periodization of the Neoproterozoic and the large-scale changes in the environment and biosphere that took place at that time. The glacial origin of diamictites of the Precambrian Chivida Formation on the Yenisei Ridge (on the western periphery of the Siberian Platform) was proposed almost a century ago but has since been disputed. The present study confirms the glacial origin of the Chivida diamictites based on the findings of striated and faceted clasts and other characteristic features of glacial deposits. Results from U-Pb dating of zircon grains from diamictites matrix with and without volcanogenic admixture, tuffaceous sandstones and volcanic breccias interbedding the diamictites of the Chivida Formation are presented. The youngest population of zircon grains revealed in the volcanogenic and tuffogenic rocks of the Chivida Formation is assumed to characterize syn-depositional volcanic activity. Thus, its mean average age (696 ± 4 Ma) is considered to characterize the glacial sediments' time of deposition. These results prove for the first time the presence of an ice sheet on the Siberian craton during the Sturtian glaciation.

AB - Knowledge on the age and distribution of glacial deposits is essential in order to solve issues surrounding the geological periodization of the Neoproterozoic and the large-scale changes in the environment and biosphere that took place at that time. The glacial origin of diamictites of the Precambrian Chivida Formation on the Yenisei Ridge (on the western periphery of the Siberian Platform) was proposed almost a century ago but has since been disputed. The present study confirms the glacial origin of the Chivida diamictites based on the findings of striated and faceted clasts and other characteristic features of glacial deposits. Results from U-Pb dating of zircon grains from diamictites matrix with and without volcanogenic admixture, tuffaceous sandstones and volcanic breccias interbedding the diamictites of the Chivida Formation are presented. The youngest population of zircon grains revealed in the volcanogenic and tuffogenic rocks of the Chivida Formation is assumed to characterize syn-depositional volcanic activity. Thus, its mean average age (696 ± 4 Ma) is considered to characterize the glacial sediments' time of deposition. These results prove for the first time the presence of an ice sheet on the Siberian craton during the Sturtian glaciation.

KW - Glacial deposits

KW - Neoproterozoic

KW - Siberia

KW - Snowball Earth

KW - Sturtian glaciation

KW - U-Pb dating

UR - http://www.scopus.com/inward/record.url?scp=85084967711&partnerID=8YFLogxK

U2 - https://doi.org/10.1016/j.precamres.2020.105778

DO - https://doi.org/10.1016/j.precamres.2020.105778

M3 - Article

VL - 345

SP - 105778

JO - Precambrian Research

JF - Precambrian Research

SN - 0301-9268

M1 - 105778

ER -