福建深沪湾牡蛎礁的成因分析

Discussion on the Genesis of the Oyster Bank in Shenhu Bay, Fujian Province

对牡蛎礁贝壳属种做了鉴定和 14测年,对牡蛎礁充填物做了粒度分析、矿物分析、有孔虫分C 析、幼体贝壳分析。研究结果表明,牡蛎礁由长重蛎、近江重蛎及泥沙组成,属于福建沿海晚更新世末次海侵(～)河口产物。牡蛎礁起始于～海侵过程中沦入浅海 44 00020 000 a.B.P. 23 000 a.B.P. -15-20m; ; 海退时完成造礁。现今,牡蛎礁出露低潮带是地壳上升和海岸侵蚀的结果。

The genus and species identification and 14C dating have been made for oyster seashell, and the analysis of grain-size, minerals, foraminifera and small seashell in fillers have also been made. The results show that the oyster bank consists of Crassostrea gigas Tunber, C. rivularis Gould , some sands and mud. It is the product in estuary during the last Pleistocene transgression ( ～～44 000 20 000 a.B.P.). The oyster bank began in 23 000 a.B.P. 15-20 m, sank into the epeiric sea during the transgression, and completed the oyster bank formation in the later regression. Today, the oyster bank is exposed at the low-water line as a the result of the crustal rising and the coastal erosion.