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- Title
Basalts of the Riphean Sequences of the Bashkirian Meganticlinorium, South Urals: New <sup>147</sup>Sm‒<sup>143</sup>Nd and Rb‒Sr ID-TIMS Isotopic Constraints.
- Authors
Puchkov, V. N.; Ronkin, Yu. L.; Sergeeva, N. D.
- Abstract
The first results of 147Sm‒143Nd and Rb‒Sr ID-TIMS isotopic–geochronological results of a comparative study of 12 samples of volcanic rocks of the Bashkirian Meganticlinorium, which were previously dated by zircons from these samples using the U‒Pb SHRIMP-II method showing the predominance of the Paleozoic ages among three stratigraphic levels with Riphean magmatic events in the South Urals, are presented. New 147Sm‒143Nd and Rb‒Sr ID-TIMS isotopic data showed that the volcanic rocks evolved as a result of crustal–mantle interaction. The Nd model ages (TDM) (2302–2540 Ma) of volcanic rocks of the Taratash Anticlinorium represent the ages of the protolith characterized by εNd(t) values from –17.4 to –20.5. The TDM value (2033 Ma) of the Paleozoic volcanic rocks of the Yamantau Anticlinorium indicates a younger (Paleoproterozoic) substrate. The minimum Nd model ages (TDM = 1160–1233 Ma) are determined for the volcanic rocks, which are spatially related to metabasalts of the Igonin magmatic event (707‒732 Ma) in the Tirlyan Syncline. The smallest εNd(t) values (–3.2, –0.9, –0.7) indicating a decrease in the amount of a crustal component relative to the mantle material are determined for the Paleozoic metabasalts in the Tirlyan Syncline in the eastern wing of the Bashkirian Meganticlinorium, which is probably related to the activation of plume processes in the eastern part of the orogen. The Rb‒Sr and 147Sm‒143Nd ID-TIMS isotopic systematics of the studied volcanic rocks expands our understanding of mantle–crustal interactions within three stratigraphic levels with Riphean magmatic events of the South Urals.
- Subjects
URAL Mountains (Russia); NEODYMIUM isotopes; VOLCANIC ash, tuff, etc.; BASALT; PALEOZOIC Era
- Publication
Doklady Earth Sciences, 2024, Vol 518, Issue 1, p1479
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X24602372