Recent revision of the Pleistocene glaciation boundaries in northern Eurasia has encouraged the search for nonglacial geological records of the environmental history of northern West Siberia. We studied an alluvial paleosol-sedimentary sequence of the high terrace of the Vakh River (middle Ob basin) to extract the indicators of environmental change since Marine Oxygen Isotope Stage (MIS) 6. Two levels of the buried paleosols are attributed to MIS 5 and MIS 3, as evidenced by U/Th and radiocarbon dates. Palynological and pedogenetic characteristics of the lower pedocomplex recorded the climate fluctuations during MIS 5, from the Picea-Larix taiga environment during MIS 5e to the establishment of the tundra-steppe environment due to the cooling of MIS 5d or MIS 5b and partial recovery of boreal forests with Picea and Pinus in MIS 5c or MIS 5a. The upper paleosol level shows signs of cryogenic hydromorphic pedogenesis corresponding to the tundra landscape, with permafrost during MIS 3. Boulders incorporated in a laminated alluvial deposit between the paleosols are dropstones brought from the Enisei valley by ice rafting during the cold MIS 4. An abundance of eolian morphostructures on quartz grains from the sediments that overly the upper paleosol suggests a cold, dry, and windy environment during the MIS 2 cryochron.

中文翻译：

---

基于 Belaya Gora 剖面的晚更新世西西伯利亚北部沉积、成土和环境历史的多重记录

最近对欧亚大陆北部更新世冰川边界的修订鼓励了对西西伯利亚北部环境历史的非冰川地质记录的搜索。我们研究了瓦赫河高阶地（鄂毕盆地中部）的冲积古土壤-沉积序列，以提取自海洋氧同位素阶段（MIS）6以来的环境变化指标。埋藏古土壤的两个层次归因于MIS 5和MIS 3，如 U/Th 和放射性碳日期所证明的那样。下部土壤复合体的孢粉学和土壤发育特征记录了 MIS 5 期间的气候波动，从云杉-落叶松由于 MIS 5d 或 MIS 5b 的冷却和北方森林的部分恢复，在 MIS 5e 期间的针叶林环境到建立苔原草原环境云杉和松属在 MIS 5c 或 MIS 5a 中。上古土壤层显示出与苔原地貌相对应的低温水形成土迹象，在 MIS 3 期间具有永久冻土层。在古土壤之间的层状冲积沉积物中包含的巨石是在寒冷的 MIS 4 期间通过冰漂流从 Enisei 山谷带来的落石。丰富来自上古土壤沉积物的石英颗粒上的风成形态结构表明，在 MIS 2 低温纪期间存在寒冷、干燥和多风的环境。