人为—生物源元素在开封古城黄泛地层沉积旋回划分中的指示意义

发布时间：2018-04-06 23:29

本文选题：黄泛地层　切入点：人为—生物源元素　出处：《地理研究》2017年06期

【摘要】：科学地划分黄泛地层沉积旋回是阐明开封古城兴衰与黄河水患关系的关键,但黄泛地层的粒度层序往往被后期人类活动所扰动,需要探索其他代用指标。在开封老城区的河南大学师专(ZKsz)和医专校区(ZKyz)以及西郊的金明校区(ZKjm)分别钻取25 m连续岩芯,共获得657个样品。用ICP和AFS法测定样品14种元素含量,以人为—生物源元素综合富集系数(IEF)为代用指标,应用小波分析技术划分沉积旋回。结果表明:岩芯Ni、Cr、Fe、Mn、Co、V和Al是自然源元素,Cd、Pb、Cu、Zn、Hg、As和P是人为—生物源元素。郊区岩芯的粒度(砂黏比)旋回与元素旋回的数目和界限相一致,指示IEF可以作为划分沉积旋回的代用指标。城区ZKsz岩芯0~12 m和ZKyz岩芯0~9 m的元素旋回分别为8个和6个,均多于其粒度旋回,IEF可以规避粒度层序紊乱的干扰,元素旋回能够准确反演黄河泛滥次数。现今开封老城区地下的战国大梁城、北宋东京城、明末开封城和清末开封城古地面分别在10~12 m、9 m、4 m和1 m左右。
[Abstract]:The key to clarify the relationship between the rise and fall of the ancient city of Kaifeng and the flood of the Yellow River is to scientifically divide the sedimentary cycles of the Yellow River pan strata. However, the granularity sequence of the Yellow River pan-strata is often disturbed by human activities in the later period, so it is necessary to explore other alternative indicators.A total of 657 samples were obtained from 25 m continuous cores in ZKszz (Henan University) and ZKyz (Medical College) and Jinming campus in western suburb of Kaifeng.The contents of 14 elements in the samples were determined by ICP and AFS. The synthetic enrichment factor (IEF) of artificial and biological elements was taken as the substitute index and the sedimentary cycles were divided by wavelet analysis.The results show that the core NiCrCU FeMnCoV and Al are natural source elements CDB PbPbCuZZZZZHgPas and P are anthropogenic biogenic elements.The grain size (sand viscosity ratio) cycles in suburban cores are consistent with the number and boundary of element cycles, indicating that IEF can be used as an alternative index for the division of sedimentary cycles.The element cycles of ZKsz core 0 ~ 12 m and ZKyz core 0 ~ 9 m in urban area are 8 and 6, respectively, which can avoid the disturbance of grain size sequence disorder, and the element cycles can accurately invert the flood times of the Yellow River.At present, the ancient ground of Daliang City of warring States, the capital of Dongjing in Northern Song Dynasty, Kaifeng City in late Ming Dynasty and Kaifeng City in late Qing Dynasty are about 10 ~ 12 m ~ 9 m ~ 4 m and 1 m ~ (-1) respectively.
【作者单位】：河南大学资源与环境研究所;黄河文明河南省协同创新中心暨河南大学黄河文明与可持续发展研究中心;
【基金】：国家自然科学基金项目(41171409) 教育部人文社会科学重点研究基地重大项目(12JJD790023) 教育部和河南省共建河南大学项目(SBGJ090101)
【分类号】：P512.2

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