Abstract

The results of U–Pb zircon dating, as well as the petrologic-geochemical study of samples of zircon-bearing garnet–biotite plagiogneiss and quartz—plagioclase–amphibole granofels from the Vishnevogorsky sequence of the oldest rocks of the Eastern domain of the Southern Ural are presented. The zircon ages were obtained using an ion microprobe (SHRIMP II). The maximum age of the substrate of plagiogneises in the Vishnevogorsky sequence is not younger than 2700 Ma and the granulite metamorphism of plagiogneiss falls in the Proterozoic age range of 1740–2220 Ma. The dates obtained for plagiogneisses and granofels of the Vishnevogorsky sequence reflect all major (PR₁–P₁) age stages in the development of the Urals. Many of the dated events have manifested only in the zircon generations and are not reflected in the mineral parageneses of the studied rocks.

中文翻译：

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Vishnevogorsky序列中的锆石的U–Pb年龄和岩石的变质作用（南乌拉尔）

摘要

U–Pb锆石测年的结果，以及来自乌拉尔南部南部东部地区最古老岩石的Vishnevogorsky序列的含锆石榴石–石榴石–黑云母斜长片和石英–斜长石–闪石颗粒的样品的岩石地球化学研究被提出。使用离子微探针（SHRIMP II）获得锆石年龄。Vishnevogorsky序列中斜长片斜纹岩基质的最大年龄不小于2700 Ma，斜长片斜纹岩的粒状变质作用属于元古代的1740-2220 Ma。Vishnevogorsky序列的斜长片麻片和Granofel获得的日期反映了所有主要（PR ₁ –P ₁）乌拉尔山脉发展的年龄阶段。许多过时的事件仅在锆石世代中表现出来，而未在所研究岩石的矿物共生物中反映出来。