新仙女木期黄河晋陕峡谷古风成沙层年代及其物质来源

张玉柱, 黄春长, 陈莹璐, 谭志海, 杨利荣, 张云翔, 邱海军, 刘波, 赵发珠

Age and provenance of Younger Dryas paleo-aeolian sandlayers in the Jin-Shaan Gorges of the Yellow River

Yuzhu ZHANG, Chunchang HUANG, Yinglu CHEN, Zhihai TAN, Lirong YANG, Yunxiang ZHANG, Haijun QIU, Bo LIU, Fazhu ZHAO

表4 黄河晋陕峡谷壶口至龙门段北桑峪晚更新世以来黄土—土壤剖面样品与其他沉积物粒度成分对比

Tab. 4 A comparison of grain size distribution between the samples of the Late Pleistocene andHolocene loess-soil profile at the Beisangyu site (BSY) in the Hukou-Longmen reach in theJin-Shaan Gorges of the Yellow River and other sediments

沉积地层 粘土 (<2 μm, %) 粉沙 (2~63 μm, %) 极细沙 (63~125 μm, %) 细沙 (125~250 μm, %) 中沙 (250~500 μm, %) 粗沙 (>500 μm, %) 古风成沙层上部 0.00 2.87 12.20 45.86 36.82 2.25 古风成沙层下部 0.00 2.79 13.80 45.59 35.19 2.63 马兰黄土层 5.92 71.07 20.77 1.71 0.41 0.12 现代河床相沙层 2.97 24.94 12.03 17.39 31.58 11.09 现代沙丘沙层 0.83 2.26 11.70 58.80 25.60 0.83