摘要
文章研究历史时期黄河下游夺泗水但未入淮的泛滥沉积物特征。对泗洪北部6个钻孔纵向与平面的粒度和元素特征的研究结果显示,根据6个钻孔黄泛层的粒度可以较明显地划分出标准偏差差别较大的2个区,即钻孔SH1、SH5、SH6黄泛层对应洪泛水道沉积微相,钻孔SH2、SH3、SH4黄泛层对应漫滩沉积微相。依靠相邻钻孔SHJ23的年龄数据和黄河夺泗入淮文献记载,大体推定泗洪北部黄泛层除主体形成于公元1128年黄河夺泗入淮后的700多年间,部分可能形成于公元前322年—公元1020年黄河短暂南流经泗入淮时期;钻孔SH6可能靠近或正处于公元前322年泗水东移至金镇时的主河道。黄泛层大部分常量和微量元素与Al的质量分数比值相对于黄土和现代黄河的差异较小,显示黄泛沉积物总体继承了黄土高原物质的元素特征;其中w(Ba)与淮河、废黄河相比较低,与现代黄河泥质、砂质沉积物相比有高有低,显示研究区黄泛沉积物受到淮河水系沉积物的影响,但影响程度较小。
The characteristics of the flood sediments in the lower reaches of the Yellow River,which has pirated Si River but not flowed into Huai River,are studied.The results of the study on the grain size and elements of six boreholes in northern Sihong show that the grain size of the Yellow River flood layer of boreholes can be clearly divided into two areas with different standard deviation,namely SH1,SH5 and SH6 boreholes corresponding to the flood channel sedimentary microfacies and SH2,SH3 and SH4 boreholes corresponding to the floodplain sedimentary microfacies.Based on the age data of a nearby SHJ23 borehole and the diversion history of the lower Yellow River,it is generally presumed that the main part of the Yellow River flood layer in the north of Sihong was formed in the 700 years since the Yellow River pirating Si River into Huai River in 1128,and it may also be partially formed during the short period of flowing southward from Si River to Huai River(322 BC-1020 AD).SH6 borehole may be near or in the main channel when Si River moved eastward to Jinzhen before 322 BC.The ratio of major and trace elements to Al in the Yellow River flood layer is lower than that in the loess and the modern Yellow River,which shows that the Yellow River flood sediments generally inherit the element characteristics of the Loess Plateau.The content of w(Ba)is lower than that of Huai River,Abandoned Yellow River and sandy sediments of modern Yellow River,and higher than that of muddy sediments of modern Yellow River.It indicates that the Yellow River flood sediments in the study area are affected by the sediments of Huai River system,but the of influence is small.
作者
康乘愿
蒋仁
曾剑威
刘凯
冯启
KANG Chengyuan;JIANG Ren;ZENG Jianwei;LIU Kai;FENG Qi(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Nanjing Center of China Geological Survey,Nanjing 210016,China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2022年第11期1550-1557,1574,共9页
Journal of Hefei University of Technology：Natural Science
基金
长江三角洲沪宁杭地区区域地质调查基金资助项目(DD20190043)
长三角覆盖区1∶5万填图试点基金资助项目(DD20160063)。
关键词
全新世
黄泛层
黄河夺泗
沉积物粒度
微量元素
常量元素
Holocene
Yellow River flood layer
Yellow River pirating Si River
sediment grain size
trace elements
constant elements
