Petroand geochemical composition of mesozoic magmatic rocks of the Taezhny massif (South Yakutia, Evotinsky gold bearing region)
https://doi.org/10.31242/2618-9712-2022-27-3-346-362
Abstract
We studied petroand geochemical features of the compositions of magmatic formations in the Taezhny massif. The massif is located in the central part of the Nimnyr block of the Aldan shield within the Leglier ore cluster in the Evotinsky gold bearing region. For the first time, according to our field and petrographic observations, the two-phase structure of the massif has been established. The first phase was represented by syenite-porphyry, and the second, by leucocratic syenite. At the later stages of magmatism development, the intrusion of bostonite and
vogesite dikes took place. According to various classification data, we distinguish two groups of rocks in the Taezhny massif: quartz syenites (phase I) with ambiguous petrochemical characteristics, which make them close to both high-potassium calc-alkaline and shoshonite petrochemical series; leucocratic syenites (phase II) of the shoshonite petrochemical series; bostonite dikes, similar to syenites and corresponding to rocks of the shoshonite petrochemical series only; vogesite dikes (syenite-monzonite lamprophyre) correspond to rocks of the shoshonite petrochemical series. All rocks are geochemically specialized for lithophilic elements: Rb, Ba, Sr, B, Cr, V, Nb, Sc. According to the ratios of trace elements, all studied rocks bear both crustal and mantle marks. We conclude that all the rocks involved in the structure of the massif could be considered as part of the monzonite-syenite formation type.
Keywords
Evotinsky gold-bearing region,
Leglier ore cluster,
Aldan shield,
magmatism,
massif,
dykes,
syenite,
vogesite
Supporting agencies: This study was carried out within the framework of the State Assignment to DPMGI SB RAS and contract with PJSC «Seligdar».
About the Authors
A. I. Ivanov
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
IVANOV, Alexei Ivanovich, Cand. Sci. (Geology and Mineralogy), Senior Researcher
39 Lenina pr., Yakutsk 677980
M. S. Ivanov
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
IVANOV, Michil Spartakovich, Engineer (1st category)
39 Lenina pr., Yakutsk 677980
A. I. Zhuravlev
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
ZHURAVLEV, Anatolii Ivanovich, Junior Researcher
39 Lenina pr., Yakutsk 677980
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Review
For citations:
Ivanov A.I., Ivanov M.S., Zhuravlev A.I. Petroand geochemical composition of mesozoic magmatic rocks of the Taezhny massif (South Yakutia, Evotinsky gold bearing region). Arctic and Subarctic Natural Resources. 2022;27(3):346-362. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-3-346-362
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