地理研究

地理研究 ›› 1983, Vol. 2 ›› Issue (1): 65-73.doi: 10.11821/yj1983010007

• 论文 • 上一篇    下一篇

渤海湾北岸表层沉积中的有孔虫群及其生态环境

李元芳1, 何希贤2   

  1. 1. 中国科学院地理研究所;
    2. 中国地质科学院地质研究所
  • 收稿日期:1982-02-04 修回日期:1982-06-25 出版日期:1983-03-15 发布日期:1983-03-15

PRELIMINARY STUDIES ON FORAMINIFERA IN SURFACE LAYER OF SEDIMENTS ALONG THE NORTH COAST OF THE BOHAI BAY AND ITS HABITAT

Li Yuanfang1, He Xixian2   

  1. 1. Institute of Geography, Academia Sinica;
    2. Chinese Academy of Geological Sciences
  • Received:1982-02-04 Revised:1982-06-25 Online:1983-03-15 Published:1983-03-15

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26

摘要： 我们对渤海湾北岸177个表层沉积物样品进行了有孔虫分析。经鉴定,未发现浮游有孔虫,底栖有孔虫共计82种,其中包括一新种Jadammina planata He et Li sp.nov.根据不同的环境中沉积物内有孔虫群属种组合不同,大体可归纳为二种组合:一是河口、海滩、泻湖、滨海平原等滨海边缘环境组合,在南堡以东该组合称为厚壁转轮虫——显孔鼓室希望虫组合,南堡以西称为厚壁转轮虫——多变假小九字虫组合,二是分布在水深10米以内的近岸浅海环境组合,称为厚壁转轮虫——缝裂希望虫组合。在不同环境中,有孔虫壳体数量的变化是有规律的,一般在泻湖中有孔虫含量最多,滨岸沙坝处最少,沙坝脊部有时为零,向海方向至近岸浅海共含量又有逐渐增多的趋势。

Abstract: About 100 samples from surface layers of deposits located along the north Coast of Bohai Bay have been qualitatively and quantitatively analyzed,A total of 82 benthonic foraminiferal species belonging to 40 genera has been identified. They are mostly salt-brackish water and shallow water species.According to the distribution of foraminifera two foraminiferal assemblages can be distinguished. 1) The littoral assemblage living in the enviroments such as the river mouths, coastal plains, beach, lagoon etc. The representative species are Ammonia confertitesta Zheng, Elphidium hughesi foraminosum Cushman, Cribrononion porisuturalis Zheng, Pseudononionella variabilis Zheng, Quinqueloculina seminula var jugosa Cushman, Nonion akitaense Asano etc. They are called the Ammonia confertitesta and Elphidium hughesi foraminosum assemblage east of Nanbao, and the Ammonia Confertitesta and Pseudononionella variabilis assemblage west of Nanbao,2)The near coast shallow sea assemblage, the representative species are Ammonia confertitesta Zheng, Elphidium magellanicum Heron-Allen and Earland, Quinqueloculina akneriana rotunda(GeRke),Cribrononion incertum (Williamson), Elphidium advenum (Cushman), Buccella frigid (Cushman) etc. It is called the Ammonia confertitesta and Elphidium magellanicum assemblage, Difference between the two foraminiferal assemblages clearly shows that the distribution of foraminiferas was associated with water depth, salinity and different types of deposits,A section has been made which is perpendicular to the coastline and passes across Shegang barrier beach. By analysing the relationships between habitats and the amount of foraminiferal shells at each sites along the section, we can judge that the amount of foraminiferal shells is latger in the shoreline of lagoon-swamps, and smaller at barrier beach, even zero on the top of the barriers, but it increases again towords the sea.Those foraminiferal assemblages and their distributions provide an important basis for explaining foraminiferal palaeoecology in this area.