The palaeo-shorelines around the lakes on the Tibetan Plateau can be used to reconstruct water level variations, which serve as sensitive indicators of hydroclimate change. Extensive studies have been carried out to constrain the Holocene lake level fluctuations by dating shorelines with a variety of methods (e.g., luminescence, ¹⁴C, ¹⁰Be and U–Th series). In comparison, the timing of the lake level variations during the last glacial and subsequent deglaciation periods has been rarely studied. The driving factors of such changes, therefore, remain elusive. In this study, we performed a detailed luminescence dating investigation on six samples taken from a nearshore sedimentary outcrop in the south of Selin Co basin. The post-IR IRSL signals measured at 225 °C (pIRIR₂₂₅) on sand-sized K-feldspar grains demonstrated a generally good behavior and yielded reliable chronologies, while the optically stimulated luminescence (OSL) signals of quartz showed systematical age underestimation, which was attributed to anomalous fading. Six pIRIR₂₂₅ ages ranging from 15 to 10 ka suggested that the lake level of Selin Co during the last deglaciation reached up to 40–45 m high above the modern lake level. In view of the regional precipitation and temperature proxy records, we consider that the glacier meltwater supply has likely been the primary contributor to the lake highstands during the last deglaciation.

青藏高原湖泊周围的古海岸线可用于重建水位变化，作为水文气候变化的敏感指标。已经进行了广泛的研究，通过用各种方法（例如，发光、¹⁴ C、¹⁰ Be 和 U-Th 系列）对海岸线进行测年来限制全新世湖水位的波动。相比之下，很少研究末次冰期和随后的冰消期湖泊水位变化的时间。因此，这种变化的驱动因素仍然难以捉摸。在这项研究中，我们对取自 Selin Co 盆地南部近岸沉积露头的六个样品进行了详细的发光测年调查。在 225 °C (pIRIR ₂₂₅）在沙子大小的钾长石颗粒上表现出普遍良好的行为并产生了可靠的年代学，而石英的光学受激发光（OSL）信号显示出系统性的年龄低估，这归因于异常衰落。六个 pIRIR ₂₂₅年龄在 15 到 10 ka 之间表明，在最后一次冰消期间，Selin Co 的湖平面达到了现代湖平面以上 40-45 m 的高度。鉴于区域降水和温度代理记录，我们认为冰川融水供应可能是最后一次冰消期间湖泊高位的主要贡献者。