Discovery and features of vertical zonations of tidal salt-marsh foraminifera in Jianchuan, North Jiangsu Province, China

Through densified surface sampling of foraminifera and accurate elevation measurement a-long three transect lines in open-coast tidal salt-marsh of Jianchuan, particular salt-marsh foraminifera assemblages were found. The salt-marsh foraminifera assemblages are distributed in well-defined vertical zonations with respect to elevation and closely parallel marsh floral zonations. At the top of the vertical zonation all foraminifera disappear abruptly which are accurately located at the highest high water datum. This distribution pattern can be used to relocate former sea levels accurately (to an accuracy of within ±5 cm). A modern regional criterion of foraminifera for relocating the former sea levels in high resolution in our country is provided, and deficiencies of studying the vertical zonation only in sheltered coast salt-marsh abroad are filled up.

我国苏北建川潮汐盐沼有孔虫垂直分带的发现和特征

通过三个断面加密有孔虫表层采样和精确高程测量 ,发现建川开敞型盐沼存在特征性盐沼有孔虫组合 ,这些组合与盐沼植被带相应 ,受高程控制 ,有明显的垂直分带 ,垂直带顶面即最高高潮位以上有孔虫突然消失 .这个有孔虫垂直分布模式可高精度地恢复古海面 (精度最高可达± 5cm) .该研究为我国高分辨恢复古海面提供了一个地区性的现代有孔虫标尺 ,同时该工作也填补了国外仅局限于研究隐蔽型海岸盐沼有孔虫垂直分带的不足 .