摘要
本文侧重于山东山旺中新世硅藻盆地的古环境分析。笔者从平面上和剖面上分别采集并分析了硅藻土样品,根据样品中硅藻植物化石的分布,综合分析了剖面 No.1、No.4、No.5的化石组合。采用了模糊数学聚类分析法,直观地显示出浮游型 Melosira 组合和底栖附生型 Cymbella-Fragilaria 组合在时间和空间上的演变,进一步反映山旺湖盆湖水的深浅及湖盆范围之变化。对具有颜色深浅不同所显示水平纹层的硅藻土作了微层分析,结合电镜扫描及氧同位素值的证据,认为此硅藻土的深浅纹层为季纹层。
This paper mainly deals with paleoenvironment of the Miocene diatomaceous earth of the Shanwang Basin.Diatomaceous samples were collected both horizontally and ventically from the Basin.The method of the fuzzy mathematics used,and a comprehensive study on the dif- ferent diatom assemblages in sections(No.1,No.4,No.5)show that in a graphic way the development and feature changes of the diatom assemblages of Melosira and Cymbella-Fragi- laria.The changes in the scope of space and time indicate the water depth and the geogra- phic area of the Basin. Another salient feature of the paper is the study of microstratum analysis on diatomaceous layers with different colors.Using the evidence of electronic scanning and information from δO^(18) method,the paper will probably give usefull information on seasonal temperature chan- ges of the Basin.
关键词
化石硅藻
中新世
模糊数学
古环境
Fossil diatoms
Miocene
The fuzzy mathematics
Paleoenvironment
