苏北盆地晚更新世晚期湖泊沉积记录的气候环境变化

通过对苏北盆地周奋剖面沉积物进行粒度、地球化学元素比值、磁化率等指标的分析,结合年代数据,重建了苏北盆地晚更新世晚期的古气候环境演化序列.结果表明,晚更新世晚期苏北盆地的古气候环境演变经历了2个阶段:阶段Ⅰ:39.6～30.3 cal ka BP期间,气候整体相对湿润,同时也存在冷干波动;阶段Ⅱ:30.3～18.6 c...

Paleoclimatic and Paleoenvironmental Changes in Late Stage of Late Pleistocene Inferred from Lacustrine Sediment in Subei Basin

Based on multi-proxy analysis of grain size, geochemical elements ratios, mass susceptibility and ¹⁴C dating, the paleoclimatic and paleoenvironmentic changes in late stage of late Pleistocene is reconstructed by ZF profile of lacustrine sediment in Subei Basin. The results indicate that the paleoclimatic evolution of Subei Basin can be divided into two major stages, the first stage is from 39.6 to 30.3 cal ka BP, in which the climate is relative warm-humid and exist a cold-dry fluctuation, the second stage is from 30.3 to 18.6 cal ka BP, in which the climate is cold-dry and relative stable. The temporal changes of grain size, geochemical elements ratios, mass susceptibility of ZF profile are consistent with the curve of stalagmites of Hulu/Sanbao Cave and ice cores oxygen isotope curve of Greenland. The millennium-scale climatic events of ZF profile are corresponding to Heinrich events H3, H2 that with dry and cold climate. The results revealed that the climate of late stage of late Pleistocene in Subei Basin has great correlation with the global climate changes and is obviously affected by the East Asian summer monsoon system driven by solar radiation.