TY - JOUR

T1 - Pre-Vendian Unconformity and Sedimentation during Late Cryogenian Glaciation: Structural Relation of Sedimentation Events in the Southwest of the Siberian Platform

AU - Sovetov, J. K.

AU - Solovetskaya, L. V.

N1 - This work was supported by state contract of the Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences (Novosibirsk, Russia) no. 122041500010-6. Sovetov, J. K. Pre-Vendian Unconformity and Sedimentation during Late Cryogenian Glaciation: Structural Relation of Sedimentation Events in the Southwest of the Siberian Platform / J. K. Sovetov, L. V. Solovetskaya // Doklady Earth Sciences. – 2025. – Vol. 524, No. 1. – P. 1-5. – DOI 10.1134/S1028334X25607667.

PY - 2025/8/18

Y1 - 2025/8/18

N2 - Abstract—: The relation of sediments and their associations is considered for the lower part of the Early Vendian (Late Cryogenian) Marnya Formation of the Oselok Group of the Sayany sedimentary basin of the Siberian Platform. The main method of comparison of genetically diverse sediments includes the lithofacies analysis and correlation of successive cross-sections, which link the sediments into the systems. Four sedimentation stages are identified in the Late Cryogenian (Early Vendian) glaciation: (1) permafrost and thermal karst, (2) glaciation, (3) primary thawing of the glacier and formation of the upper glacier stagnant lakes with a package of cap dolomites, and (4) full regional thawing of the glacier and formation of fluvioglacial fans. The key correlation elements include the kurum breccias, which formed at the first stage as a result of the uplift of the paleocontinent and its “dry” freezing, and tillites formed during its glaciation. The pre-Vendian unconformity formed in several stages: general rise and areal denudation of the craton, sliding of kurums, thermokarst dissolution of the Riphean carbonate rocks, glacier exaration, and erosion by glaciofluvial river flows. The deposits of the carbonate platform, which overlaps glaciofluvial fans, are ascribed to the Ediacaran global deglaciation and eustatic uplift of ocean level.

AB - Abstract—: The relation of sediments and their associations is considered for the lower part of the Early Vendian (Late Cryogenian) Marnya Formation of the Oselok Group of the Sayany sedimentary basin of the Siberian Platform. The main method of comparison of genetically diverse sediments includes the lithofacies analysis and correlation of successive cross-sections, which link the sediments into the systems. Four sedimentation stages are identified in the Late Cryogenian (Early Vendian) glaciation: (1) permafrost and thermal karst, (2) glaciation, (3) primary thawing of the glacier and formation of the upper glacier stagnant lakes with a package of cap dolomites, and (4) full regional thawing of the glacier and formation of fluvioglacial fans. The key correlation elements include the kurum breccias, which formed at the first stage as a result of the uplift of the paleocontinent and its “dry” freezing, and tillites formed during its glaciation. The pre-Vendian unconformity formed in several stages: general rise and areal denudation of the craton, sliding of kurums, thermokarst dissolution of the Riphean carbonate rocks, glacier exaration, and erosion by glaciofluvial river flows. The deposits of the carbonate platform, which overlaps glaciofluvial fans, are ascribed to the Ediacaran global deglaciation and eustatic uplift of ocean level.

KW - Late Cryogenian glaciation

KW - Sayany Trough

KW - Siberian Platform

KW - lithofacies analysis

KW - pre-Vendian unconformity

UR - https://www.mendeley.com/catalogue/1bea39ba-0430-3c6b-b6d5-74d5e84529b6/

UR - https://elibrary.ru/item.asp?id=82761997

U2 - 10.1134/S1028334X25607667

DO - 10.1134/S1028334X25607667

M3 - Article

VL - 524

SP - 1

EP - 5

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 1

M1 - 1

ER -