利用元素地球化学特征研究河北平原第四纪沉积环境的探讨与实践

The use of geochemical characteristics of elements in the study of Quaternary sedimentary environment in the Hebei Plain

应用河北省平原区多目标区域地球化学调查获得表层和深层土壤元素含量数据,对河北平原的第四纪沉积环境进行了分区。以SiO2、Na/Rb比值、Ca/Ba比值、Rb,U,Ga和Fe,Mg,Ni,V均一化累加和等地球化学指标作为第四纪沉积环境的分区指标,共划分出山前残坡积-洪冲积相、冲积扇堆积相、中部平原河道带相、古黄河泛洪相、风积相、海陆过渡相等6个沉积相及河床亚相、漫滩亚相及洼地亚相等3个沉积亚相。此项研究是多目标地球化学应用于基础地学研究的重大实践,取得了十分理想的研究效果。

In this paper,the results of multi-object regional geochemical survey are used to partition the Quaternary sedimentary environment in the Hebei Plain.Using the geochemical indicators,such as SiO2,Na/Rb ratio,Ca/Ba ratios,Rb,U,Ga and Fe,Mg,Ni,V homogenization accumulation and so on,as indicators for Quaternary sedimentary environments partition,the six Quaternary sedimentary facies and three sedimentary subfacies were discriminated.They are piedmont residual talus-alluvial facies,the alluvial fan accumulation facies,the Central Plain rivers centralizing belt facies,the ancient Yellow River flooding facies,the wind facies,and the marine-continental transition facies;and the bed subfacies,floodplain subfacies and the depression subfacies.The study is a significant practice of applying multi-purpose geochemistry survey to geological studies,and the result is comparatively prominent.