Chara-Sinsk dike swarm (middle reach of the Lena River): local UPb age of zircon and petrological and geochemical features of rocks
https://doi.org/10.52349/08697892_2021_87_28-41
Abstract
The research focuses on the comprehensive analysis of petrological, geochemical, and isotopicgeochronological characteristics of the Chara-Sinsk dike swarm, which is mapped in the middle reaches of the Lena River. Intrusions of the Chara-Sinsk dike swarm frame the Vilyui rift from the southeast. The intrusions are dikes, small sills, stocks, and chonoliths. Their petrological composition varies from dolerite and gabbrodolerite to syenite. In general, in terms of the distribution of petrogenic, trace elements and REE, the studied rocks have a significant similarity with Middle Paleozoic intrusions of the Vilyui rift, in particular, with the Vilyui-Markha dike swarm. The results of isotopic dating of the zircon by the U-Pb method showed that the formation of the Chara-Sinsk dike swarm occurred during a relatively short time interval of 364–374 Ma. The obtained isotope dating results fully correspond to the time interval (357–379 Ma) of Devonian dike magmatism in the large Yakutsk-Vilyui igneous province.
About the Authors
V. E. Guzev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI); Saint-Petersburg Mining University (SPMU)
Russian Federation
Russian Federation
Geologist; Ph. D. Student
G. A. Kozlov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Ph. D. Student, Geologist
A. V. Terekhov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Candidate of Geological and Mineralogical Sciences, Deputy Head of the Department
A. V. Molchanov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Doctor of Geological and Mineralogical Sciences, Head of Department
I. O. Lebedev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Leading Geologist
Yu. L. Svetlova
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Geologist
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Review
For citations:
Guzev V.E., Kozlov G.A., Terekhov A.V., Molchanov A.V., Lebedev I.O., Svetlova Yu.L. Chara-Sinsk dike swarm (middle reach of the Lena River): local UPb age of zircon and petrological and geochemical features of rocks. Regional Geology and Metallogeny. 2021;(87):28–41. (In Russ.) https://doi.org/10.52349/08697892_2021_87_28-41
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