The volcanic–terrigenous Tim Formation in the Kursk Block of Sarmatia occurs in the Paleoproterozoic synforms. The Tim Formation volcanics are represented by metamorphosed ferropicrites, ferropicritic basalts, basalts, and andesibasalts. According to the U–Pb dating of zircon, their possible age is 2099 ± 8 Ma. Thus, the Tim Formation deposits were separated by a long hiatus from the terrigenous–chemogenic strata of the Kursk Group (~2.6–2.4 Ga). Basaltic magmatism is caused by upwelling of melts from the asthenospheric mantle in the slab-window of the subducted oceanic plate during accretion–collisional interaction between the Kursk domain and the Volga–Don orogen.

中文翻译：

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萨尔马提亚库尔斯克地块内蒂姆组的古元古代火山：年龄和地球动力学环境

萨尔马提亚库尔斯克地块的火山陆源蒂姆组出现在古元古代同形体中。蒂姆组火山岩以变质铁质岩、铁质玄武岩、玄武岩和安山玄武岩为代表。根据锆石的 U-Pb 定年，它们的可能年龄为 2099±8 Ma。因此，蒂姆组矿床与库尔斯克群陆源化学成因地层（~2.6-2.4 Ga）之间有很长的间隔。玄武质岩浆作用是在库尔斯克域和伏尔加-顿河造山带之间的吸积-碰撞相互作用过程中，在俯冲大洋板块的板状窗口中从软流圈地幔上涌的熔体引起的。