1855年黄河改道事件在渤海的沉积记录  

Sedimentary Records Correspond to Relocation of Huanghe River in Bohai Sea

作　　者：廖永杰[1] 范德江[1] 刘明[1,2] 王伟伟[3] 赵全民[3] 陈彬[1] 

机构地区：[1]中国海洋大学海洋科学与探测技术教育部重点实验室,山东青岛266100 [2]海洋沉积与环境地质国家海洋局重点实验室,山东青岛266061 [3]国家海洋环境监测中心,辽宁大连116023

出　　处：《中国海洋大学学报（自然科学版）》2015年第2期88-100,共13页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41376055,41030856);国家重大基础研究发展计划项目(2010CB951202);海洋沉积与环境地质国家海洋局重点实验室开放基金项目(MASEG201204)资助

摘　　要：通过对渤海柱状沉积物中粒度特征及常、微量元素含量变化的系统分析,揭示了1855年黄河改道事件在渤海中部的沉积记录,探讨了改道前后渤海沉积环境的变化。研究表明,2个沉积物柱样上部的粒度、元素含量特征均明显异于下部,可把两柱样分别划分为Ⅰ类、Ⅱ类两种类型,分别代表了黄河改道后和之前的物质类型。Ⅰ类沉积物平均粒径更细、分选更好,物质组成更接近于黄河沉积物;Ⅱ类沉积物平均粒径更粗、分选较差,物质组成更接近于渤海周边陆域物质;Ⅰ、Ⅱ类沉积物中Ni、Zn、Sr、Ba、Zr等5种元素含量差异明显,可作为区别黄河物质和渤海周边陆源物质的指标。黄河改道后研究区水动力环境趋弱,同时还使初级生产力下降,并且研究区的沉积环境由滨-浅海的氧化环境,转变为前三角洲、三角洲前缘的弱氧化-还原环境。In this study, the impact on the sedimentary record and environment in central Bohai Sea by the event of the Yellow River diversion in 1855 was discussed, through studies of the grain size characteristics and chemical elements concentrations in 2 core sediments collected from Bohai Sea. Research showed that there were significantly differences between the upper and lower parts in the 2 cores. They could be divided into two types, representing the Yellow River sediments and the terrigenous substance around Bohai Sea, respectively. The material composition of Class I were closer to the Yellow River sediments, with finer, better sorting characteristics, and class II were more coarse, poor sorting, which possible illustrated the land substances surrounding the Bohai. The elements of Ni, Zn, Sr, Ba, Zr had significant differences between the two type sediments, could he used as identification indicators of the Yellow and terrigenous substance surrounding Bohai Sea. After Yellow River diversion, the hydrodynamic force of study area became weaker, and primary productivity was also declined. The sedimentary environment in the study area were transfered to delta-delta front with weak oxidation-reduction conditions, from the oxydic shore-shallow environment before.

关 键 词：渤海 黄河改道 沉积记录 

分 类 号：P736.2[天文地球—海洋地质]