摘要
亻表口牡蛎礁剖面原位胶结的牡蛎礁层之间有 6层粉沙夹层 ,这一层序被认为是 6 5 0 0～ 30 0 0aB .P .多次海面波动的反映 ,该剖面的研究被认为是近年来全新世海面研究的重大成果。然而 ,组成蛎礁的属种长牡蛎和近江牡蛎产于低潮线附近至十余米水深 ,生活的盐度很广 ,可以在盐度 10‰～ 30‰的海区栖息。它们在指示沉积物形成的深度上虽有一定意义 ,但并不是海水深度良好的指示标志。其兴衰不是由于海面变化造成的。泥砂沉积速率的变化是导致牡蛎礁与砂层交替出现的原因。亻表口牡蛎礁剖面既不能反映 6 5 0 0～ 5 0 0 0aB .P .存在高海面 ,也不能说明 5 0 0 0～ 30 0 0aB .P .海面波动频繁。
The main part of the Holocene stratigraphic section at Biaokou Village, Ninghe County, Tianjin Municipality is composed of oyster reef and 6 silt interbeds. This sedimentary sequence was thought to be products of sea level fluctuation in the period of 6500-3000 a B.P. by some scientists. The present mollusks Ostrea gigas and O. virularis , which compose the oyster reef, live in the environment from low tidal level to 10 m sea water depth and more with salinity of 10‰-30‰. Ostrea gigas and O. virularis are not ideal water depth indicators, although can give some information. Growing up and disappearance of the oysters in the section was controlled by the changes of depositional rate but not sea level fluctuation. The Holocene stratigraphic section at Biaokou Village can not indicate existences of high sea level during 6500-5000 a B.P. and sea level fluctuation during 5000-3000 a B.P.
出处
《地理科学》
CSCD
北大核心
2003年第1期49-51,共3页
Scientia Geographica Sinica
