山东省潍坊北部第四系有孔虫及古环境意义

The Quaternary Foraminifera and Paleoenvironments in Northern Weifang,Shandong Province

通过对潍坊北部第四系钻孔GK89、GK79、GK74、GK59岩心中192个微体古生物样品进行分析,其中在66个样品中获得丰富的有孔虫化石,鉴定出17个属40个种,以广盐度Ammonia beccarii为优势种,其次有Ammonia annectens、Elphidium(多种)、Protelphidium、Cribrononion gnythosuturatum、Nonionella、Quinqueloculina等属种,形成广盐性化石组合。根据有孔虫属种、丰度、分异度在垂向上的分布进行沉积环境分析,划分出陆相、海陆过渡相及海相,识别出3个海侵层,对应该区更新世以来的3次海侵,自上而下分别与黄河三角洲地区的垦利海侵、广饶海侵和晚沾化海侵同期。该研究对于潍坊北部第四纪海侵及环境变化,尤其是加强山东半岛蓝色经济区地质环境调查工作具有重要意义。

Abundant foraminifera fossils were recovered from 66 samples taken from GK89,GK79,GK74,GK59 drilling cores in northern Weifang,Shandong province.17 genera and 40 species were indentified with Ammonia beccarii as dominant species and Ammonia annectens,Elphidium（varied）,Protelphidium,Cribrononion gnythusuturalis,Nonionella,Quinqueloculinaas genus-species,forming euryhaline fossil assemblages.According to the vertical distribution of species,abundance and diversity of foraminifera,the sedimentary environments were divided into continental,transitional and marine facies.Three marine interlayers were recognized,corresponding to Kenli,Guangrao and late Zhanhua transgressions in the Yellow River Delta region from upper to lower respectively.This study is of great significance for investigations into the geological environment in Shandong Peninsula Blue Economic Zone as well as the Quaternary transgression and environmental changes.