The results of U–Pb isotope dating of perovskites from silicate–calcite vein rocks spatially associated with the Kusa–Kopan gabbro intrusion are presented. At present, the genesis of these silicate–carbonate rocks remains controversial. The obtained U–Pb ages are 497.0 ± 4 Ma for perovskite from the Perovskite mines and 468 ± 6.4 Ma for that from the Zelentsovskaya mine. The obtained ages are significantly different from the age of the Kusa–Kopan gabbro intrusion (1379 ± 8 Ma). Furthermore, the REE distribution trend (LA–ICP–MS) in the perovskites studied is similar to that in perovskites from carbonatites and kimberlites. Together with the geochronological data, this suggests that the carbonate–silicate rocks studied originated from a carbonatite origin. Additional confirmation of the manifestation of Early Paleozoic diastrophism in the region studied is the U–Pb age of zircons from volcanics of the Bashkir anticlinorium obtained earlier by various methods.

中文翻译：

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南乌拉尔西部斜坡古生代内源活动的第一个证据

展示了空间上与 Kusa-Kopan 辉长岩侵入体相关的硅酸盐-方解石脉岩钙钛矿的 U-Pb 同位素测年结果。目前，这些硅酸盐-碳酸盐岩的成因仍存在争议。获得的 U-Pb 年龄为来自钙钛矿矿的钙钛矿的 497.0 ± 4 Ma 和来自 Zelentsovskaya 矿的钙钛矿的 U-Pb 年龄为 468 ± 6.4 Ma。获得的年龄与 Kusa-Kopan 辉长岩侵入的年龄（1379±8 Ma）有显着差异。此外，所研究的钙钛矿中的 REE 分布趋势 (LA-ICP-MS) 与来自碳酸岩和金伯利岩的钙钛矿的分布趋势相似。连同年代学数据，这表明所研究的碳酸盐-硅酸盐岩石起源于碳酸盐岩。