40Ar/39Ar DATING OF MARUYAMAITE (K-DOMINANT TOURMALINE) FROM DIAMOND-BEARING METAMORPHIC ROCKS OF THE KOKCHETAV MASSIF
https://doi.org/10.5800/GT-2023-14-3-0699
Abstract
40Ar/39Ar analyses were made on maruyamaite (potassium-dominant tourmaline) from tourmaline-quartz-feldspar rocks discovered within the Kumdy-Kol microdiamond deposit (Kokchetav massif, North Kazakhstan). Turmaline yielded well-defined 40Ar/39Ar plateau age spectra whose values coincide within the error - ages of 502.3±8.0, 502.2±8.0, 506.0±8.0 Ma. These ages are much younger than the age of 530±2 Ma determined for high-pressure metamorphism by different methods. Thus, the formation of tourmaline-rich rocks of the Kumdy-Kol deposit cannot be associated with the high-pressure metamorphic events, and, therefore, testifies in favor of the low-pressure nature of maruyamaite. Based on the coincidence of age data for tourmaline crystals with different potassium contents, it can be concluded that the K/Ar system in tourmaline can be used for dating metasomatic and metamorphic processes.
Supporting agencies: The study was supported by the Russian Science Foundation (grant 18-17-00186). Sampling began as part of the state assignment of the IGM SB RAS.
About the Authors
A. V. Korsakov
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
D. S. Yudin
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
K. A. Musiyachenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; University of British Columbia
Russian Federation
Russian Federation
Andrey V. Korsakov.
3 Academician Koptyug Ave, Novosibirsk 630090; Vancouver V6T 1Z4, Canada
S. P. Demin
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090
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Review
For citations:
Korsakov A.V., Yudin D.S., Musiyachenko K.A., Demin S.P. 40Ar/39Ar DATING OF MARUYAMAITE (K-DOMINANT TOURMALINE) FROM DIAMOND-BEARING METAMORPHIC ROCKS OF THE KOKCHETAV MASSIF. Geodynamics & Tectonophysics. 2023;14(3):0699. (In Russ.) https://doi.org/10.5800/GT-2023-14-3-0699
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