济阳坳陷新生界海绿石的存在及其地质意义

Occurrence and Geological Significance of Glauconite in Cenozoic Group of Jiyang Depression

大量的薄片鉴定资料表明 ,济阳坳陷沾车凹陷新生界地层中含有海绿石矿物 ,并且均为原生海绿石。尽管其沉积时代不同 ,但分布范围相对集中 ,即主要分布于古近系沙四段上部 沙一段的底部。结合古生物化石的分析 ,认为济阳坳陷沾车凹陷在陆相湖盆沉积的大背景下 ,曾遭受过小规模的海侵 ,对当时的沉积环境产生了一定影响 ,由此在一定程度上产生了生物的变异和海绿石的沉积。对海绿石的成因分析将有助于确定当时的沉积环境。

It is indicated that glauconites have been found in Cenozoic group strata in Zhan-che sag of Jiyang depression by a variety of thin section identification, and which are all in the primary state. Though deposited in different epochs, they are relatively concentrated in the study area, that is, mostly ccurred inthe strata of Cenozoic Paleogene from No.1 to No.4 of Shahejie Formation. Based on the analysis of biology fossils, it is considered that Zhan-che sag of Jiyang depression was ever invaded by the small-scalemarinetransgression under the background of the continental basin, which influenced sedimentary environment at that time, and occurred biologic variation and glauconite deposit to a certain extent. It is helpful to confirm the sedimentary environment by analyzing glauconite formation.