【摘要】 环太平洋西岸,特别是渤海湾西北岸沿海平原全新世地层中广泛分布着由Crassostrea gigas牡蛎形成的礁体。总结了渤海湾西北岸30余年来众多研究者的主要成果。论述了C．gigas的定名沿革、生态习性、礁体特征、礁体与海面的关系。测定了C． gigas壳体的¹⁸O和¹³C同位素组成,发现了壳体生物碳酸钙的年际变化规律。结合可靠的¹⁴C数据,建立了正常建礁与个体分泌壳体之间的线性函数关系（约1cm／a）、水平夹层的平均历时（约200a／层）等定量参数,进而提出“礁体历时假说”,并将该地区时间跨度约7750～95calBP的化石牡蛎礁划分为8道礁群,论证了礁体内部水平夹层和礁体之上泥质“转换层”可能记录的百年尺度的“缓变型”环境变化。更多还原

【Abstract】 Reefs consisting of the oyster Crassostrea gigas are widely distributed in Holocene strata along the west coast of the Pacific Ocean, especially on the northwest coastal plain of the Bohai Bay. This paper summarizes the major achievements of many researchers obtained from the northwest coast of the Bohai Bay in the past 30-odd years. It discusses the naming history and ecological habit of Crassostrea gigas, reef characteristics and relationship with the sea level. The authors have determined the δ¹⁸O and δ¹³C compositions of Crassostrea gigas shells and found the annual cyclicity of biocarbonate of the shells. On that basis, combined with the reliable ¹⁴C data, the authors establish a linear function relation between the normal reef-building and the shell secretion of individuals （ca. 1 cm/a） and quantitative parameters such as the average time span for the horizontal interlayers （ca. 200 a/layer）, and then further propose a working hypothesis on "reef duration". On the basis of this hypothesis, the fossil oyster reefs are divided into 8 groups with a time span from ca. 7750 to 950 cal. a BP. Finally, it is demonstrated that the internal horizontal interlayers of the reefs and "transitional muddy layers" overlying immediately on the top of the reefs are probably two proxies recording the centennial-scale "slow change" of the local environment.更多还原