Abstract—

The C and Sr isotopic signatures and the Pb–Pb age of carbonate sedimentary rocks of the Vorogovka Group in the reference section in the Vorogovka River valley, northwestern Yenisei Range, were obtained. The deposits of the group ascribed to the Severnaya Rechka, Mutnina, and Sukhaya Rechka Formations fill a large trough, and lithological and textural features indicate a high sedimentation rate. Most of the carbonate rocks are represented by limestones with low Fe/Sr and Mn/Sr ratios and average δ¹⁸O value (–6.0 ± 1.6‰ V-PDB), indicating the well-preserved isotope systems of the rocks. The ⁸⁷Sr/⁸⁶Sr ratios and δ¹³С values vary within narrow limits of 0.70816–0.70826 and –1.4 to +0.8‰ for Upper Severnaya Rechka limestones and 0.70818–0.70829 and +1.0 to +2.0‰ for Sukhaya Rechka limestones, respectively. The Pb–Pb isochrone ages of carbonate rocks of the Severnaya Rechka and Sukhaya Rechka formations are 580 ± 40 Ma (MSWD = 1.4) and 565 ± 90 Ma (MSWD = 1.1), respectively. According to chemostratigraphic and isotope-geochronological data, the accumulation of limestones of the Vorogovka Group could have occurred at 580–550 Ma, that corresponds to the Late Vendian or Late Ediacaran. It is evident that the duration of accumulation of Vorogovka Group did not exceed 10–15 m.y. The Vorogovka Trough is different from in the sedimentation pattern from other Late Vendian marginal troughs at the southwestern part of the Siberian Platform and formed independently.

中文翻译：

---

叶尼塞山脉西北部Vorogovka组（新生代）的碳和碳同位素化学地层学和碳酸盐沉积的Pb–Pb年龄

摘要—

获得了叶尼塞山脉西北部沃罗戈夫卡河谷参考区内沃罗戈夫卡组碳酸盐沉积岩的碳同位素和锶同位素特征以及碳酸盐沉积岩的铅-铅年龄。属于Severnaya Rechka，Mutnina和Sukhaya Rechka组的该组沉积物充满了一个大槽，岩性和质地特征表明其沉积速率很高。大部分的碳酸盐岩是由具有低的Fe / Sr和锰/ Sr比值和平均δ灰岩表示¹⁸ O值（-6.0±1.6‰V-PDB），表示岩的保存完好的同位素系统。在⁸⁷ SR / ⁸⁶ Sr比值和δ ¹³С值在上Severnaya Rechka石灰石的0.70816–0.70826和–1.4至+ 0.8‰的狭窄范围内变化，而Sukhaya Rechka石灰石的0.70818–0.70829和+1.0至+ 2.0‰的狭窄范围分别变化。Severnaya Rechka和Sukhaya Rechka组碳酸盐岩的Pb-Pb等时年龄分别为580±40 Ma（MSWD = 1.4）和565±90 Ma（MSWD = 1.1）。根据化学地层学和同位素-地质年代学数据，Vorovovka组的石灰岩堆积可能发生在580-550 Ma，这对应于晚Vendian或Ediacaran晚。显然，Vorogovka群的堆积持续时间不超过10–15。Vorogovka槽与西伯利亚台地西南部其他晚Vendian边缘槽的沉积方式不同，并且是独立形成的。