内蒙古岱海湖泊沉积物岩芯典型的粒度频率曲线数据集（10.5ka以来）

岩芯12.26m的TIMS测年结果为(10446±489)a，通过对深度15m以上的岩芯中沉积物的粒度分析发现，10.5kaBP前后的粒度组成特征发生了明显的变化，粒度频率曲线表现为以粗颗粒占主导的单峰态-双峰态变为细颗粒相对集中的对称的单峰态。从湖泊沉积学的角度似可以认为，10.5kaBP前后沉积物粒度特征的变化反映了湖水从浅变深的过程，可以理解为10.5kaBP前岱海地区温度剧降、植被盖度降低，加之降水偏少、湖面缩小，风力加强扬起较多的湖岸粗颗粒物质进入了湖内。这与过去前人所作的该时段岱海地区出现突然降温，湖水急剧下降的看法相一致，也与新疆艾比湖在同期降温的看法相吻合。因此应用TIMS法所测的年代结果是可信的。

The TIMS dating result of the core at 12.26 m depth is (10446 ± 489) a. Through grain size analysis of sediments in the core above 15 m depth, it was found that the grain size composition characteristics changed significantly around 10.5 ka BP: the grain size frequency curve shifted from a unimodal-bimodal distribution dominated by coarse particles to a symmetric unimodal distribution with relatively concentrated fine particles. From the perspective of lacustrine sedimentology, it can be inferred that the change in sediment grain size characteristics around 10.5 ka BP reflects the transition of the lake from shallow to deep water. This can be interpreted as: prior to 10.5 ka BP, the Daihai Lake area experienced a sharp temperature drop, reduced vegetation coverage, coupled with less precipitation and shrinking lake surface, and enhanced wind lifted a large amount of coarse-grained materials from the lake shore into the lake. This is consistent with previous viewpoints that a sudden cooling and sharp lake level drop occurred in the Daihai Lake area during this period, and also matches the view that Ebinur Lake in Xinjiang experienced cooling during the same period. Therefore, the dating results obtained by the TIMS method are credible.