海州湾南岸全新世海面波动及其影响范围

Holocene sea-level changes and its effects on the south coast of Haizhou Bay, Jiangsu Province

海州湾位于南黄海西部,我国自然地理南北分界的东端,海州湾沿岸属于我国东部沿海海岸南北之间重要过渡地段。对该区全新世海面波动研究显得极为重要,本文分别依据海州湾南岸的徐圩孔和孔望山孔两个钻孔全新世地层的岩心,对其作了微古样品定量分析。结合海州湾南岸古文化遗址、海侵遗迹的调查与分析,探讨了海州湾南岸全新世海面波动规律。

According to palaeoecological analysis of foraminiferal and ostracoda groups in the Holocene layer of two drilling holes, the Xuwei and Kongwangshan holes, in south coast of the Haizhou Bay, the relative curve of Holocene sea-level changes is established. The curve shows that the Holocene sea-level during 7.7ka B. P. equals to presently sea-level and later three obvious high peak of sea-level, i.e. 6.5Ka, 3.75Ka and 1.7ka. Three peaks were 3,5 and 4 meters higher than pressent sea-level respectively and three low peaks of sea-level changes in 5.5ka and 2.5 Ka were -4, 0 and more than 0 meter respectively. The sea-level decreases to present height after 1 ka. Owing to many times marine transgressions and regressivenesses, respectively the multiaction of two sea-level changes during middle Holocene the landform in south Haizhou region trends gradually to a flat surface, effecting greatly on the height of sea-level.