海南岛洋浦湾和三亚湾底质中有孔虫的研究

本文对海南岛洋浦和三亚两海湾表层沉积中的有孔虫进行了研究,发现优势属组合平面上呈有规律的分布,自陆侧泻湖海湾、经口门至口外内浅海,依次出现:Ammobaculites组合 Ammonia组合 Elphidium组合Quinqueloculina组合;有孔虫埋葬群的各项特征参数也作有规律的变化.洋浦新英湾与三亚泻湖环境上的差异,也使有孔虫组成有明显的差别.即使同一泻湖海湾,水下地貌的不同,有孔虫组合亦有一定差异. 该项研究,无疑为滨海边缘古环境分析提供一个有效的现代参考模式,对石油勘探、海面变化等生产和理论研究均有较重要意义。

A PRELIMINARY STUDY OF FORAMINIFERA IN THE BOTTOM SEDIMENTS OF YANGPU HARBOR AND SANYA HARBOR OF HAINAN ISLAND

Identification and quantitative analyses of foraminifera in 24 bottom sediment samples from Yangpu and Sanya Harbors were carried out in order to determine the horizontal variation in the distribution of the foraminifera populations. From Sanya Lagoon or Xinying Bay through their baymouths to inner shallow sea, the number of foraminifera in one gram dry sample increases, the species diversity increases too; oppositely their dominance decreases. Five generic predominance assemblages of foraminifera arc found in the research regions: 1 An Ammobaculites assemblage on the silty clay beach with mangroves in Xinying Bay and Sanya Lagoon. 2 An Ammonia assemblage distributed widely on the shallows and bottom in Xinying Bay and Sanya Lagoon. 3 An Elphidium assemblage in the seaward areas adjacent to the baymouths of Sanya Lagoon and Xinying Bay. 4 A Quinqueloculina assemblage in the seaward areas far from the baymouths of Sanya Lagoon and Xinying Bay. 5 A Cellanthus assemblage in Dachan Island in Yangpu Bay. Salinity is found to be the main factor controlling the regularity of the foraminifera assemblage distribution in Yangpu and Sanya Harbors. Secondly substrate type and bottom topography also affect the distrition and features of the foraminifera assemblages in the research regions.