The U-Pb-age of the accessory zircon of the metamorphic rocks magmatic protolith of the UHP Maksyutovo complex was determined (U-Th-Pb by the SIMS (SHRIMP II) method). The protolith age was most confidently determined for metabasite shales in two samples (648±3 and 566±3 Ma). The age of zircon from shales, the chemical composition of which corresponds to andesidacites– is 549±4 Ma. The age of the protolith of garnet-omphacite metabasite rocks is 501±5 Ma. Two crystals of magmatic zircon with an age of 893±6 Ma, representing a xenogenic population, were separated from eclogites. The age value of 561±10 Ma for the protolith of eclogites, according to the data of the previous researchers, is assumed. Magmatic complexes with an age close to the range of the obtained values of the age of the protolith (549–648 Ma) are known in the Uraltau zone and represent fragments of the volcanic-plutonic belt of the active continental margin. The integral age of the metamorphism of the Maksyutovo complex from two samples of this area is 380±3 Ma.
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Ryazantsev et al. (2024) studied this question.
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