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在环境敏感带的风积物、湖积物剖面中采集了 1 7个样品 ,建立了适用于风积物中花粉浓缩物提取的实验方法 .将花粉浓缩物的测年结果与某些已知年代样品作了对比研究 ,进行了花粉浓缩物的加速器14 C测年的初步探索 .结果表明 ,在稳定环境下与沉积物同时沉积的花粉测年具有一定的可信度 .它将为改善黄土高原晚更新世以来年代测定提供一条新的可能途径 .同时 ,将14 C测年与野外地质观察相结合 ,提取了该敏感带晚更新世向早全新世转换过程中 4次主要的季风降水变化的地质记录
Seventeen samples were collected from the aeolian and lacustrine profiles of the environment-sensitive belt, and the experimental methods suitable for the extraction of pollen concentrate in the aeolian soil were established. The dating results of the pollen concentrate were compared with some known A comparative study was conducted on the samples of the age, and the 14 C dating of pollen concentrates was first explored.The results show that there is a certain degree of confidence in the pollen dating deposited simultaneously with the sediments in a stable environment, A new possible method is provided for the dating of the plateau since the late Pleistocene.At the same time, 14C dating and field geology observations were combined to extract four major monsoon precipitation changes from the late Pleistocene to the Early Holocene in this sensitive zone Geological records