TY - JOUR

T1 - Late Neoproterozoic evolution of the southwestern margin of the Siberian Craton

T2 - evidence from sedimentology, geochronology and detrital zircon analysis

AU - Romanov, Mikhail

AU - Sovetov, Julius K.

AU - Vernikovsky, Valery A.

AU - Rosenbaum, Gideon

AU - Wilde, Simon A.

AU - Vernikovskaya, Antonina E.

AU - Matushkin, Nikolay Yu

AU - Kadilnikov, Pavel I.

N1 - Publisher Copyright: © 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/7/11

Y1 - 2020/7/11

N2 - Sedimentary successions and igneous rocks exposed in Eastern Sayan provide an important geological record on the tectonic evolution of the southwestern margin of the Siberian Craton during the Neoproterozoic. Here we present sedimentological and detrital zircon provenance data from key stratigraphic units, complemented by a new U-Pb zircon age of 718 ± 6 Ma from the mafic Nersa magmatic complex. Sedimentological and provenance data from the lower part of the stratigraphic succession (Karagasy Group) show that these rocks were deposited in a passive margin setting after 750 Ma and before the emplacement of the Nersa magmatic complex. The upper part of the stratigraphic succession (Oselok Group) consists of Cryogenian and Ediacaran glaciogenic deposits and associated cap carbonates, overlain by mid to late Ediacaran sequences of dominantly shallow-marine and fluvial siliciclastic rocks. Provenance data indicate that rocks from the Tuva-Mongolia and Zavkhan terranes provided a significant input of detrital material into the sedimentary basin that was the source of the glacial deposits. Orogenic processes during the late Ediacaran (ca 570–540 Ma) in Eastern Sayan were likely associated with the accretion of the Tuva-Mongolia terrane, as indicated by the detrital zircon data.

AB - Sedimentary successions and igneous rocks exposed in Eastern Sayan provide an important geological record on the tectonic evolution of the southwestern margin of the Siberian Craton during the Neoproterozoic. Here we present sedimentological and detrital zircon provenance data from key stratigraphic units, complemented by a new U-Pb zircon age of 718 ± 6 Ma from the mafic Nersa magmatic complex. Sedimentological and provenance data from the lower part of the stratigraphic succession (Karagasy Group) show that these rocks were deposited in a passive margin setting after 750 Ma and before the emplacement of the Nersa magmatic complex. The upper part of the stratigraphic succession (Oselok Group) consists of Cryogenian and Ediacaran glaciogenic deposits and associated cap carbonates, overlain by mid to late Ediacaran sequences of dominantly shallow-marine and fluvial siliciclastic rocks. Provenance data indicate that rocks from the Tuva-Mongolia and Zavkhan terranes provided a significant input of detrital material into the sedimentary basin that was the source of the glacial deposits. Orogenic processes during the late Ediacaran (ca 570–540 Ma) in Eastern Sayan were likely associated with the accretion of the Tuva-Mongolia terrane, as indicated by the detrital zircon data.

KW - Cryogenian glaciation

KW - detrital zircon geochronology

KW - Eastern Sayan

KW - Neoproterozoic

KW - Nersa magmatism

KW - Siberian Craton

KW - Tuva-Mongolia

KW - Yenisey Ridge

KW - Zavkhan

KW - zircon U-Pb age

KW - PROTEROZOIC POSTCOLLISIONAL GRANITOIDS

KW - A-TYPE GRANITES

KW - ALKALINE MAGMATISM

KW - ACTIVE CONTINENTAL-MARGIN

KW - YENISEI-RIDGE

KW - SHARYZHALGAI-UPLIFT

KW - WESTERN MARGIN

KW - LU-HF ISOTOPE

KW - U-PB AGE

KW - TECTONIC EVOLUTION

UR - http://www.scopus.com/inward/record.url?scp=85087861912&partnerID=8YFLogxK

U2 - 10.1080/00206814.2020.1790044

DO - 10.1080/00206814.2020.1790044

M3 - Article

AN - SCOPUS:85087861912

SP - 1

EP - 24

JO - International Geology Review

JF - International Geology Review

SN - 0020-6814

ER -