The Formation Age of Pegmatites of the Mama Mica Belt: New U–Pb (ID-TIMS) Data on Zircons

The Formation Age of Pegmatites of the Mama Mica Belt: New U–Pb (ID-TIMS) Data on Zircons

New geochronological (U–Pb ID-TIMS) data on zircons from pegmatites of the Mama mica belt in the Baikal Highlands are presented. The ages obtained for the plagioclase pegmatites (388 ± 2 and 389 ± 2 Ma, Mochikit deposit) and two-feldspar pegmatites (333 ± 1 and 332 ± 3 Ma, Slyudyanka deposit) demons...

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Veröffentlicht in:Doklady earth sciences 2022-12, Vol.507 (2), p.987-993
Hauptverfasser: Tkachev, A. V., Sal’nikova, E. B., Rytsk, E. Yu, Kotov, A. B., Ivanova, A. A., Tolmacheva, E. V., Plotkina, Yu.V.
Format: Artikel
Sprache:eng
Schlagworte:
Belts
Cratons
Earth and Environmental Science
Earth Sciences
Feldspars
Geochronology
Geology
Lead
Mica
Mineralogical research
Plagioclase
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Zusammenfassung:New geochronological (U–Pb ID-TIMS) data on zircons from pegmatites of the Mama mica belt in the Baikal Highlands are presented. The ages obtained for the plagioclase pegmatites (388 ± 2 and 389 ± 2 Ma, Mochikit deposit) and two-feldspar pegmatites (333 ± 1 and 332 ± 3 Ma, Slyudyanka deposit) demonstrate a significant age gap (50–60 Ma) between them. Based on the entire set of geological and new geochronological data available, it is proposed to divide the Mama complex, to which they were previously assigned, into two separate granitoid complexes.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22601043