基于有孔虫生态转换函数定量重建全新世相对海平面变化：以胶州湾为例

Microfossil plays an important role in paleo-sedimentary environment study. Considering the limitation of general species analysis method of microfossil, this project will carry out application research on using foraminifera transfer function to quantitatively reconstruct sea-level change. Firstly, the distribution of foraminifera and its environmental controlling factor of Jiaozhou Bay, from salt marsh to offshore and epeiric sea, will be studied, foraminifera transfer function that is applicable to Jiaozhou Bay will be established. Then, the high-resolution data of the Holocene sea-level changes in the area of Jiaozhou Bay will be acquired by applying transfer function on fossil foraminifera and the result will be compared with the local tidal data over a long period of time, to estimate the practicability and accuracy of the foraminifera transfer function method. The result of this project will provide an instance and reference for the microfossil quantitative method research of other region in the eastern coast of China.

以有孔虫为代表的微体化石在古沉积环境研究中发挥着重要作用。本项目针对常规微体古生物属种分析方法的局限性，拟开展利用有孔虫转换函数定量恢复海平面变化的应用研究。首先，考察胶州湾盐沼及浅海环境有孔虫分布规律及环境控制因素，建立适用于胶州湾地区的有孔虫古生态转换函数；进而，将建立的有孔虫古生态转换函数应用于胶州湾地区的钻孔化石有孔虫资料，获得胶州湾地区全新世以来高分辨率的海平面变化记录，并与研究区当地验潮资料进行对比，检验转换函数方法的实用性和准确性。项目研究成果可以为中国东部沿海地区开展微体化石的定量应用研究提供范例和参照。

本项目通过对胶州湾西岸红石崖盐沼在一年中不同季节的沉积物采样分析，查明了红石崖盐沼有孔虫在不同季节的生态分布情况和壳体埋藏规律，确认了高程是影响盐沼有孔虫垂向分布的主要环境因素。使用不同季节盐沼有孔虫活体群训练集建立了有孔虫-高程转换函数，转换函数的推导性能良好。通过对红石崖盐沼邻近的潮滩、浅海环境的沉积物采样分析，明确了胶州湾自盐沼至潮滩、浅海环境的底栖有孔虫分布情况。上述成果为利用有孔虫数据进行海岸带沉积环境恢复提供了现代基础资料，有助于更为精确地进行沉积环境判识，并为后续的海平面变化研究提供了定量方法。