渤海现代沉积的研究

根据测定的１２个箱式和１１个柱状岩芯的＾２１０Ｐｂ放射性强度，首次系统地介绍了渤同代沉积速率（１００ａ时间尺度）。从＾２１０Ｐｂ的垂直分布特征和确切的地层年龄着手，结合有关资料，探讨了渤海近百年的沉积环境和沉积格局，利用放射性同位素＾２１０Ｐｂ不仅对研究所形成地层的沉积作用和混合作用过程具有重要意义，而且对海洋油气开发地质工程的调查与评价提供科学依据。

STUDY OF THE MODERN SEDIMENTATION IN THE BOHAI SEA

Systematic sedimentation rates on a 1 00-year time Scale, based on the profiles of 210Pb and the spaces distributian of 210Pb activity, from the 11 box cores and 11 long cores in the Bohai Sea were presented and discussed. The results show that in the central pert of the Bohai Sea the distributian of 210Pb activity ranges from 2. 19 to 6. 31 dpm/g. The 210Pb activity in this region is higher than that of the Liaodong Bay, Bohai Bay and Laizhou Bay. On the other hand, profile of 210Pb activity and sediment flux indicated that the sedimentary environment in the contral part of the Bohai Sea was relatively stable during the last hundred years. The profiles of excess 210Pb activity in the cores is strongly correlated with CaCO3 percentage, suggesting that born are dominated by the historical events (migratian of the Hunghe Channel) based on the 210 Pb dating, the sedimentation pattern and sedimentary environment in the Bobal Sea are also discussed.