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采用挖探井方式获取西峰蔡家咀剖面200 cm黄土沉积序列,以7个14C-AMS测年数据为年龄控制点,利用沉积物粒度模式建立最近20 ka的年代框架。磁化率、灰度、粒度等指标的综合对比表明该剖面记录了末次盛冰期增温以来几次重要气候事件,如Heinrich事件1(H1)、Blling-Allerd暖期(B-A)、新仙女木事件(YD)、8.2 ka事件等,说明西峰黄土剖面具有记录短尺度气候突变事件的潜力。
A 200 cm loess sedimentary sequence was obtained from a digging-exploration well at the Caijiazui section of Xifeng. Seven 14C-AMS dating data were used as the age control points. The sediment grain size model was used to establish the framework of the most recent 20 ka. The comprehensive comparison of the indices of magnetic susceptibility, grayscale and grain size indicated that the profile recorded several important climatic events since the last glaciation warming, such as Heinrich event 1 (H1), Blling-Allerd warm-season (BA) New Fairy Wood event (YD), 8.2 ka event, indicating that the Xifeng loess profile has the potential to record short-range climate abrupt events.