The upper and lower age boundaries of the middle riphean (Ti-Fe-V) intrusions of the kusinsko-kopanskii complex in the South Urals: U-Pb dating of zircons from the Medvedevskoe deposi

Nature of Perovskite Mineralization of Silicate-Carbonate Veins in the Margins of Kusinsko-Kopanskaya Layered Intrusion (South Urals, Russia)

“…This study focuses on silicate-carbonate veins extracted along the contact of the Kusinsko-Kopanskaya gabbro intrusion (Figure 1c). The age of this intrusion, determined by U-Pb zircon dating, is Middle Riphean, specifically 1379 ± 8 Ma [15]. The intrusion features a layered structure, consisting of alternating melanocratic and leucocratic types of gabbro.…”

“…Currently, three models explain the formation of perovskite mineralization: the "skarn" model, which suggests that mineralization occurs through magnesian skarns at the contact between the Kusinsko-Kopanskaya intrusion and dolomites [11]; the "metamorphogenic" model, proposing that perovskite mineralization results from regional metamorphism [12]; and the "carbonatite" model, which associates it with endogenous activity on the Western slope of the Southern Urals [13,14,18]. Recent U-Pb dating of perovskites from mineral mines, showing ages between 486-535 Ma [18], along with earlier TIMS dating results, contrasts sharply with the age of the Kusinsko-Kopanskaya intrusion (1379 ± 8 Ma [15]). This significant age disparity casts doubt on the "skarn" model and points to the need for an alternative explanation for perovskite mineralization.…”

The Riphean Magmatism Preceding the Opening of Uralian Paleoocean: Geochemistry, Isotopes, Age, and Geodynamic Implications

“…The Kusa-Kopan group of intrusions has been recently studied in great detail using the isotope method [Kholodnov et al, 2006[Kholodnov et al, , 2010Kholodnov, Shagalov, 2012;etc.]. The isotopic age data obtained with U-Pb, Sm-Nd, and Rb-Sr methods indicate that the ages of ore-bearing gabbroids of the Kusa-Kopan group and the Gubenka and Ryabinovka granite massifs overlying them in the east, lie in the same range of 1385-1395 Ma.…”

“…Thus, owing to the variety of isotope methods used, we were able to reliably establish that gabbroids, granitoids, and the ores of the Kusa-Kopan complex formed in a similar age range, namely, at the beginning of the Middle Riphean. A few granite porphyry dikes intruded the Medvedevka deposit a bit later: 1353±16 Ma [Kholodnov, Shagalov, 2012].…”