TY - JOUR

T1 - Neoproterozoic evolution of the northwestern margin of the Siberian Platform

AU - Kochnev, Boris B.

AU - Khudoley, Andrey K.

AU - Priyatkina, Nadezhda S.

AU - Andrew Dufrane, S.

AU - Pokrovsky, Boris G.

AU - Kuznetsov, Anton B.

AU - Kaurova, Olga K.

AU - Marusin, Vasiliy V.

N1 - Funding Information: Field studies, major, trace element chemical analyses and manuscript preparation were supported by the Russian Foundation for Basic Research, project No 20-05-00101 and by Russian Science Foundation, project 22-77-10096 (B.B.K.). Data interpretation was partly supported by Russian Science Foundation, project No 21-17-00052 (V.V.M.). Pb–Pb dating performed under the NIR IPGG RAS FMUW-2021-0003 (A.B.K. and O.K.K.). The study of carbon and oxygen isotope composition supported by the Russian Science Foundation, project No 20-77-10066 (B.G.P.). We thank the editor (Prof. Victoria Pease) and reviewers (Dmitry P. Gladkochub, Peter A. Cawood and an anonymous reviewer) for their constructive comments and suggestions which improved the manuscript considerably. All co-authors declare no conflict of interests. Publisher Copyright: © 2022 Elsevier B.V.

PY - 2022/11

Y1 - 2022/11

N2 - New geochronological, geochemical and carbon isotope data from the Igarka Uplift constrain the age and reveal geodynamic evolution of the northwestern Siberian Platform in the latest Mesoproterozoic and Neoproterozoic. Dolostones of the Medvezhy Formation, the oldest part of the sedimentary succession, correspond to the latest Mesoproterozoic (∼1000 Ma) according to stable isotopic composition. Overlaying volcano-sedimentary Ludy, Gubinskaya and Igarka formations are no older than 715 Ma according to detrital zircon ages and carbon isotope data. Chemical composition of the Igarka Formation and synchronous mafic intrusions of the Gubinskaya Formation suggest a single magma source developed in an intraplate rifting environment. The Ediacaran Chernaya Rechka and Izluchina formations unconformably cover both meso- and mid-Neoproterozoic sequences. The age of the Ediacaran units are confirmed by the Pb-Pb isochron age of 610 ± 50 Ma and large positive C-isotope anomaly in the Chernaya Rechka limestones. Abundant Neoproterozoic (950–800 Ma) detrital zircons in the studied Neoproterozoic sedimentary rock units points to the existence of a hypothetic large Neoproterozoic orogenic belt on the northeastern periphery of the Siberian Platform unexposed nowadays. The pre-Ediacaran rift trough of the Igarka Uplift and other similar structures, mark extensional environments along the present western margin of the Siberian platform in the mid-Neoproterozoic. These structures are coeval to a large igneous province (ca. 720 Ma) at the northern Laurentia associated with the Rodinia breakup.

AB - New geochronological, geochemical and carbon isotope data from the Igarka Uplift constrain the age and reveal geodynamic evolution of the northwestern Siberian Platform in the latest Mesoproterozoic and Neoproterozoic. Dolostones of the Medvezhy Formation, the oldest part of the sedimentary succession, correspond to the latest Mesoproterozoic (∼1000 Ma) according to stable isotopic composition. Overlaying volcano-sedimentary Ludy, Gubinskaya and Igarka formations are no older than 715 Ma according to detrital zircon ages and carbon isotope data. Chemical composition of the Igarka Formation and synchronous mafic intrusions of the Gubinskaya Formation suggest a single magma source developed in an intraplate rifting environment. The Ediacaran Chernaya Rechka and Izluchina formations unconformably cover both meso- and mid-Neoproterozoic sequences. The age of the Ediacaran units are confirmed by the Pb-Pb isochron age of 610 ± 50 Ma and large positive C-isotope anomaly in the Chernaya Rechka limestones. Abundant Neoproterozoic (950–800 Ma) detrital zircons in the studied Neoproterozoic sedimentary rock units points to the existence of a hypothetic large Neoproterozoic orogenic belt on the northeastern periphery of the Siberian Platform unexposed nowadays. The pre-Ediacaran rift trough of the Igarka Uplift and other similar structures, mark extensional environments along the present western margin of the Siberian platform in the mid-Neoproterozoic. These structures are coeval to a large igneous province (ca. 720 Ma) at the northern Laurentia associated with the Rodinia breakup.

KW - Carbon isotopes chemostratigraphy

KW - Mafic rock geochemistry

KW - Neoproterozoic

KW - Pb-Pb carbonate age

KW - Siberian Platform

KW - U-Pb detrital zircon

UR - http://www.scopus.com/inward/record.url?scp=85140489028&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/1b34d363-ab6f-3faf-a7af-50b5daf02187/

U2 - 10.1016/j.precamres.2022.106877

DO - 10.1016/j.precamres.2022.106877

M3 - Article

AN - SCOPUS:85140489028

VL - 382

JO - Precambrian Research

JF - Precambrian Research

SN - 0301-9268

M1 - 106877

ER -