黄河三角洲的￣（210）Pb剖面与再沉积作用

￣(210)Pb PROFILE AND REDEPOSITION OFTHE YELLOW RIVER DELTACheng Guodong

根据黄河三角洲东部钻孔岩芯的￣（２１０）Ｐｂ剖面资料，经标准化消除了因粒级不同所造成￣（２１０）Ｐｂ浓度变化的影响后，显示该孔的２１０ｐｂ剖面可分为１１段。每段呈指数衰减，段与段之间呈现￣（２１０）Ｐｂ放射性比度逆增，反映了由于再沉积作用造成￣（２１０）Ｐｂ的稀释作用。

After standardizing the 210Pb profile of drilling hole g1C2 located at the eastern partof the Delta ,eleven sections are distinguished in the profile. The concentrations of 210Pbdecrease (Fig. 5)gradually , but reverse increase of radioactivity ratio appears in the sec-tions ,showing that the concentration of 210Pb has been diluted by addition of ancient sed-iments caused by resuspending. According to the 210Pb age ,the sedimentary history wasestablished in the area.