近代黄河三角洲海域^(210)Pb多阶分布与河口变迁  

STAGE PROFILES OF ^(210)Pb AND IMPLICATION OF MIGRATION OF THE CHANNEL TO THE MODERN HUANGHE RIVER DELTA

作　　者：李凤业[1] 袁巍[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《海洋与湖沼》1992年第5期566-570,F003,共6页Oceanologia Et Limnologia Sinica

基　　金：国家自然科学基金重大项目"黄河流域环境演变与水沙运行规律"中"黄河三角洲演变与下游河道堆积的关系"课题

摘　　要：黄河是中国的第二大河流,输沙量居世界之冠(平均年输沙量约12亿吨),黄河的频繁改道和大量泥沙入海促成了黄河三角洲的迅速形成。测定黄河口外海区近代沉积速率和沉积通量对沉积动力学的研究及黄河三角洲的治理与开发有重要意义。近年来,国内外学者利用^(210)Pb法广泛测定了江、河、湖泊和浅海陆架的沉积速率,取得了可喜的成果。然而,测定象黄河口外高速沉积环境海域的近代沉积速率是一个新的尝试。本文利用^(210)Pb法测定了黄河三角洲海域4个岩芯^(210)Pb的放射性强度,结果报告于后。210Pb activity in sediments of four cores from the modern Huanghe River Delta were determined by a spectrometer. The profiles of 210Pb decay with depth were in stages that agreed well with the periods of historical migration of the channel to the modern Huanghe River Delta. 210Pb dating indicates that the lowest sedimentation rate is about 1.29 cm/a (highest about 14.52cm/a). The sedimentary and relative pause periods corresponding to historically different channels of the Huanghe River, the sedimentary environment and the trend in the transportation of materials from the Huanghe River, are discussed.

关 键 词：黄河 三角洲 铅210 分布 河口 

分 类 号：P736.44[天文地球—海洋地质]