苏北全新世海进与古砂堤研究

Study on Holocene transgression and sandbars in North Jiangsu

本文探讨了苏北全新世以来的海进与古砂堤的演变过程。结果表明，全新世以来，苏北地区曾有海进，大约距今7ka左右，海进达到了高峰，里下河地区成为一片浅海。此后，海面相对稳定，沿岸堆积作用显著，出现了西冈、中冈、东冈、新冈等古砂堤群，其成为苏北海岸变迁的重要标志。

This article deals with the courses of transgression and changes of old sandbars since the Holocene in North Jiangsu. The results show that during the Holocene, there happened transgression in North Jiangsu. About 7 000 a, B. P., the transgression reached its climax and the Lixiahe area was reduced into a shallow sea. Since then, the sea level has been comparatively stable, the doposition added remarkblly in the region along the sea, and a group of old sandbars as Xigang, Zhonggang, Donggang and Xinggang took shape and becarne the evidences of coastline changes in North Jiangsu.