论文部分内容阅读
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。
A total of 192 microfacies paleontological samples collected from cores of Quaternary series GK89, GK79, GK74 and GK59 in Northern Weifang were analyzed. Among them, abundant foraminifera fossils were obtained from 66 samples and 40 species of 17 genera were identified. Ammonia beccarii was the dominant species, followed by Ammonia annectens, Elphidium species, Protelphidium species, Cribrononion gnythosuturatum species, Nonionella species and Quinqueloculina species, forming a broad-salt fossil assemblage. Based on the vertical distribution of foraminiferal species, abundance and degree of differentiation, the sedimentary environment was analyzed and the terrestrial facies, transitional facies and marine facies were identified, and three marine transversions were identified. 3 times of transgression, top-down respectively, with the Yellow River Delta Kenli transgression, Guangrao transgression and late Zhanhua sea invasion over the same period. This study is of great significance to Quaternary transgression and environmental change in the northern part of Weifang, especially for the investigation of geological environment in the blue economic zone of Shandong Peninsula.