TY - JOUR

T1 - Палеомагнетизм и источники сноса нижнекембрийских отложений Уджинского поднятия (север Сибирской платформы)

AU - Pasenko, Aleksandr M.

AU - Malyshev, Sergey V.

AU - DuFrane, Scott A.

AU - Shatsillo, Andrey V.

N1 - Funding Information: ‡ The study of the Udzha’s river Proterozoic sediments and interpretation of the Proterozoic ages of detrital zircons erw e carried out iw th the support and as part of the implementation of the RSF project № 19-77-10048. The processing and interpretation of paleomagnetic data aw s supported by the RFBR grant № 18-05-00285. Publisher Copyright: © 2020 St. Petersburg University Press. All rights reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8

Y1 - 2020/8

N2 - Lately data have been getting more and more, indicating an unusual, abnormal state of the magnetic field at the boundary of the Precambrian and Phanerozoic. This fact limits significantly the possibility on employing the paleomagnetic approach for creating various paleoreconstructions in this time interval, and it allows a better understanding of the evolution of the Earth's magnetic field. Until recently, there was no exact binding of Lower Cambrian sections bearing an anomalous paleomagnetic record to the chronostratigraphical chart, which did not allow to obtain adequate estimates of the duration of the anomalous state of the magnetic field. In this study we present the results of a paleomagnetic study of the Lower Cambrian terrigenous-carbonate rocks of the Udzha and Anabar uplifts (Emyaksa and Medvezh Formations). New evidence has been obtained of the anomalous the paleomagnetic record in these rocks, which manifests itself in the objective existence of two significantly different directions of the high-temperature magnetization components, the formation of which cannot be explained by a later remagnetization. U-Pb dating of detrital zircons constraints the maximum depositional age of the Manykay and Emyaksa Formations on ~520 Ma, what pointing to Atdaban age of studied succession in combination with the faunistic characteristic of the upper part of the Emyaksa Formation. The age constraits obtained indicate on a specific paleomagnetic record, due to the peculiarities of the generation of the geomagnetic field of the terminal Precambrian - Early Cambrian, can be traced back to the Atdaban age, including.

AB - Lately data have been getting more and more, indicating an unusual, abnormal state of the magnetic field at the boundary of the Precambrian and Phanerozoic. This fact limits significantly the possibility on employing the paleomagnetic approach for creating various paleoreconstructions in this time interval, and it allows a better understanding of the evolution of the Earth's magnetic field. Until recently, there was no exact binding of Lower Cambrian sections bearing an anomalous paleomagnetic record to the chronostratigraphical chart, which did not allow to obtain adequate estimates of the duration of the anomalous state of the magnetic field. In this study we present the results of a paleomagnetic study of the Lower Cambrian terrigenous-carbonate rocks of the Udzha and Anabar uplifts (Emyaksa and Medvezh Formations). New evidence has been obtained of the anomalous the paleomagnetic record in these rocks, which manifests itself in the objective existence of two significantly different directions of the high-temperature magnetization components, the formation of which cannot be explained by a later remagnetization. U-Pb dating of detrital zircons constraints the maximum depositional age of the Manykay and Emyaksa Formations on ~520 Ma, what pointing to Atdaban age of studied succession in combination with the faunistic characteristic of the upper part of the Emyaksa Formation. The age constraits obtained indicate on a specific paleomagnetic record, due to the peculiarities of the generation of the geomagnetic field of the terminal Precambrian - Early Cambrian, can be traced back to the Atdaban age, including.

KW - Detrital zircons

KW - East Siberian platform

KW - Lower Cambrian

KW - Manykay formation

KW - Paleomagnetism

KW - Source rocks

KW - U-Pb dating

KW - Detrital zircons

KW - East Siberian platform

KW - Lower Cambrian

KW - Manykay formation

KW - Paleomagnetism

KW - Source rocks

KW - U-Pb dating

KW - ZIRCON

KW - source rocks

KW - MAGMATISM

KW - GEOMAGNETIC-FIELD

KW - U-PB

KW - CRATON

KW - paleomagnetism

KW - CONSTRAINTS

KW - MAGNETOSTRATIGRAPHY

KW - manykay formation

KW - detrital zircons

KW - APPARENT POLAR WANDER

KW - DIRECTIONS

KW - AGE

UR - http://www.scopus.com/inward/record.url?scp=85091893277&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/1d4af87c-3dd4-34c7-b3d4-c8ad4a9fa091/

U2 - 10.21638/SPBU07.2020.308

DO - 10.21638/SPBU07.2020.308

M3 - статья

AN - SCOPUS:85091893277

VL - 65

JO - Вестник Санкт-Петербургского университета. Науки о Земле

JF - Вестник Санкт-Петербургского университета. Науки о Земле

SN - 2541-9668

IS - 3

ER -