【摘要】 黄河分流河道摆动频繁，自１８５５年以来形成了８个三角洲叶瓣。１９０４－１９２９年的三角洲沉积物划归一个叶瓣较为合适。１９３４－１９３８年和１９４７－１９６４年也应该划归一个叶瓣。叶瓣活动时间短，平均活动时间只有１６年。单个叶瓣形成的沉积物厚度有限。一个钻孔剖面上的三角洲沉积物常常分层于数个叶瓣。叶瓣废弃后改造时间短，还没有形成较粗的改造，沉积物便被新的叶瓣所覆盖。两个叶瓣的界线不很清楚。但根据沉积结构和构造，微体化石，￣（２１０）ｐｂ测年方法，土壤层以及历史记录，可以识别出不同的叶瓣。更多还原

【Abstract】 Yellow River Delta,Lobe,Division,Recorgnition Abstract Eight delta lobes have been constructed in the Modern Yellow River Delta since 1 855,asa result of frequent shifting of the distributary channdls. The average acting time of the lobeis 16 years,The delta deposits formed in 1904-1929 are consisted in one of the delta lobe,Thedelta deposits formed in 1934-1938 and 1947-1964 make up another delta lobe,Delta depositsin the drill core are commonly composed of those from several lobes.The boundary betweentwo lobes is mot obvious,being short of relatively coarse deposits,However,diffrent lobesstill can be recorgnized based on sedimentary texture and structure,microfossils,￣(210)Pb datingand historical documents.Coarse silt is deposited in the middle part of the river mouth and clayey silt is accumulat-ed in the lateral parts at the depth of 0-1 2m in water.The migration of the river mouth re-sults in abrupt change in lithology,which often shows the boundary of two delta lobes.The clayey silt is in abundance of foraminifera in protelphidium tuberculatum assem-blages,although the deposits are not coarse silts or fine sands.更多还原