Abstract—

The Pb–Pb isotope age and the Sr isotope signature of the Upper Riphean sedimentary limestones from the south of the Yenisei Range on the western margin of the Siberian Craton were obtained. The Pb–Pb age of carbonate deposits of the Dadykta Formation of the Tungusik Group in the Kamenka facial zone in the east of the Yenisei Range is 1020 ± 20 Ma. The Pb–Pb age of limestone of the Gorevka Formation of the Shirokaya Group in the Glushikha facies zone in the western part of the region is estimated at 1020 ± 70 Ma. The ⁸⁷Sr/⁸⁶Sr ratio in limestones of the Dadykta Formation lies within 0.70536–0.70590 and that of the Gorevka Formation lies within 0.70552–0.70578. This coincides with a decrease in the ⁸⁷Sr/⁸⁶Sr ratio in a paleo-ocean immediately after the culmination of the Grenville orogeny. The correlation of the Shirokaya Group with the Oslyanka Group of the Kamenka Zone in combination with other data has shown that the accumulation of the Tungusik, Shirokaya, and Oslyanka groups occurred within an interval of 1030–950 Ma. The isotope age of the Middle and Upper Riphean boundary at the base of the Tungusik Group of the Yenisei Range is estimated at 1030 Ma, which is consistent with the age of this boundary in the sections of the Turukhansk Uplift and the Uchur-Maya Region of Siberia. It was revealed that the greater part of the Upper Riphean (Neoproterozoic) in the sedimentary record of the Yenisei Range is missing. The observed facial zoning of the Riphean deposits of the Yenisei Range represents the configuration of the ancient sedimentary basin that existed at the western margin of the Siberian Craton long before the collisional events accompanied by granite intrusions and superimposed metamorphism in the Neoproterozoic.

中文翻译：

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叶尼塞山脉的上部里菲安：通古斯组和白居屋族群的石灰石的高级化学成象学和Pb-Pb年龄

摘要—

获得了西伯利亚克拉通西缘叶尼塞山脉以南的上里菲安沉积石灰岩的铅-铅同位素年龄和锶同位素特征。在叶尼塞山脉以东的Kamenka面部带的通古西克组的达格塔组碳酸盐岩的碳铅矿床的Pb-Pb年龄为1020±20 Ma。该地区西部古卢什卡相带地区Shirokaya组Gorevka组的石灰岩的Pb–Pb年龄估计为1020±70 Ma。达迪克塔组石灰岩的⁸⁷ Sr / ⁸⁶ Sr比在0.70536–0.70590之间，而Gorevka组的比率在0.70552–0.70578之间。这与⁸⁷ Sr / ⁸⁶的降低同时发生Grenville造山运动达到顶峰后，古海洋中的Sr比值。Shirokaya组与Kamenka地区的Oslyanka组的相关性结合其他数据表明，Tungusik，Shirokaya和Oslyanka组的堆积发生在1030-950 Ma的间隔内。叶尼塞山脉通古西克群底部的中，上Riphean边界的同位素年龄估计为1030 Ma，这与图鲁汉斯克隆起和Uchur-Maya地区部分的边界年龄一致。西伯利亚。据透露，叶尼塞山脉沉积记录中的上里菲亚（新生代）大部分不存在。