华北平原北部全新世沉积中某些元素的分布规律

本文根据钻孔岩芯化学分析资料,研究了华北平原北部全新世沉积地层中化学元素Fe、Mn、Ca、Mg、Cu、Ni、Zn、B等以及CaCO_3的分布,它们的迁移和积累受制于气候条件,沉积环境以及海洋等多种因素的控制。在全新世早、中、晚三个沉积阶段中,元素Ca、Mg以及CaCO_3的含量具有高—低—高的分布特征,而元素Fe、Mu、Cu、Ni、Zn和B则表现出低—高—低的变化趋势

DISTRIBUTIVE REGULARITIES OF SOME ELEMENTS IN THE HOLOCENE DEPOSITIONAL ENVIRONMENT IN THE NORTH OF THE NORTH CHINA PLAIN

The northern plain of the Bohai bay had, in the Holocene time, a great change in depositional environments and climats, which led to quite different distributions of the geochemical environments and geochemical elements.The content of Fe, Mn, Gu, Zn, Ni, B, Rb was lower in Early Holocene than Ca and Mg, easily movable element.In Middle Holocene, these elements in question increased in the concentration with the temperature getting warm and with transgression and weathering intensive. By the end of this period, these elements have turned lower in the concentration than Ca, Mg and CaCO_3. Due to a variety of material resources, the content of Fe, Mg, Ca, Mg and CaCO_3 in the Luanhe alluvial plain may he lower than those in the Jiyunhe and Chaobaihe plain