Accelerator mass spectrometry radiocarbon (AMS 14C) dating was used for determining the age of wedge ice. It has been found that between 11,270 and 6420 cal BP, or the Greenlandian and Northgrippian stages of the Holocene, ice wedges grew syngenetically in sandy deposits with gravel in the Chara River valley. The variations of δ18O values in the ice wedges are about 8‰, from –25.5‰ to –18.8‰. Based on the stable isotope composition of ice wedges, paleotemperature reconstructions revealed that the mean January temperature was as low as –38°C during the coldest periods of the early half of the Holocene and as high as –28°C during the warmer periods.

中文翻译：

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来自跨贝加尔湖恰拉冰楔的全新世早期氧同位素年代学 (11,267–6420 CAL BP)

加速器质谱放射性碳 (AMS14C) 年代测定用于确定楔形冰的年龄。研究发现，在距今 11,270 至 6420 年之间，即全新世的格陵兰期和北格里普期，冰楔在查拉河谷的沙质沉积物中与砾石同生生长。 δ 的变化18冰楔中的 O 值约为 8‰，从 –25.5‰ 到 –18.8‰。根据冰楔的稳定同位素组成，古气温重建显示，全新世上半叶最冷时期一月平均气温低至–38°C，较暖时期则高达–28°C。