Abstract The influence of the Holocene sedimentation conditions on uranium accumulation in sediments in Syrytkul Lake has been studied. The comparison of geochemical, palynological, and diatom data has made it possible to reveal the relation between the U concentration (5–89 ppm) in lacustrine sediments and environmental changes over more than 12 cal ka BP. The Late Glacial lake clay is relatively depleted in U. The maximum enrichment in U has been determined for lake sediments accumulated about 11.6–10.3 cal ka BP under climate warming and humidification. It has been concluded that the climate could have affected U accumulation through the catchment vegetation shifts. The dark coniferous forests that spread out after the climate cooling about 4.2 cal ka BP could have contributed to the U decrease.

中文翻译：

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Syrytkul湖（南乌拉尔）沉积物中异常铀浓度的全新世环境

摘要 研究了全新世沉积条件对锡里特库尔湖沉积物中铀积累的影响。地球化学、孢粉学和硅藻数据的比较使得揭示超过 12 cal ka BP 的湖泊沉积物中 U 浓度（5-89 ppm）与环境变化之间的关系成为可能。晚冰期湖黏土在 U 中相对贫化。在气候变暖和增湿条件下，湖沉积物积累的约 11.6-10.3 cal ka BP 已确定 U 的最大富集。已经得出结论，气候可能通过流域植被变化影响 U 积累。在气候冷却约 4.2 cal ka BP 后散开的深色针叶林可能导致 U 减少。