赣北黄茅潭湖泊沉积记录的240年以来古洪水事件

吴霜, 刘倩, 曹向明, 赖忠平, 陈远辉, 贾玉连

A 240-year sedimentary record of paleoflood events from the Huangmaotan Lake, northern Jiangxi Province

Shuang WU, Qian LIU, Xiangming CAO, Zhongping LAI, Yuanhui CHEN, Yulian JIA

表1 洪水期和非洪水期沉积物各粒度组分和粒度参数对比

Tab.1 Comparison of grain size composition and grain size parameters of sediments in flood and non-flood periods

深度/m 平均粒径/μm 砂/% 粉砂/% 粗粉砂/% 细粉砂/% (粗粉砂+细粉砂)/粘土 分选系数 洪水期 0.08 17.61 2.40 85.54 16.47 69.07 1.563 2.22 0.19 21.05 2.50 80.27 23.94 56.33 0.880 2.34 0.30 14.68 0.80 86.55 28.92 57.63 2.345 2.20 0.63 17.57 2.30 82.01 30.97 51.04 2.120 2.51 非洪水期 0.04 10.24 0.12 73.28 20.20 53.08 0.763 2.14 0.31 9.65 0.90 83.27 12.83 70.45 0.867 1.97 0.45 9.74 0.53 77.35 13.46 63.89 0.633 2.50 0.71 7.28 1.46 60.55 6.90 53.65 0.220 2.54