潍北平原地区全新世以来的海侵与海岸线变迁

Transgression and Coastline Changes in Weibei Plain Region Since Holocene

摘要:

末次冰期后，在全新世大暖期及区域沉降的影响下，渤海湾沿岸普遍发育海侵现象，位于莱州湾南岸的潍北平原区在经历全新世最大海泛面后，海水退却过程中留下了数条古海岸线，形成了多处贝壳堤、牡蛎礁等海岸带遗迹。研究区内新发现常家村、后柳家2处牡蛎礁，其14C年龄分别为（5130±30）a B.P.和（6030±30） a B.P.；通过对区内全新世海陆交互相沉积关系及海相地层分布规律的研究，结合已有测年数据与近现代遥感影像数据，对潍北平原区全新世以来的海陆变迁进行了总结，恢复了自6000 a B.P.至公元1989年间的6条海岸线。

Abstract:

After the last glacial period, under the influence of the holocene megathermal period and regional subsidence, transgression has generally developed along the coast of the Bohai Bay. The Weibei Plain on the west bank of the Bohai Bay has experienced the largest Holocene flooding, after the sea retreated, several ancient coast lines have been left in the process, and many coastal relics, such as chenier and oysterreefs have been formed. Two oyster reefs in Changjiacun and Houliujia are newly discovered in the area. The carbon isotope agea are (5130±30)a B.P. and (6030±30)a B.P.Through study on Holocene marineterrestrial interaction sedimentation relationship and the distribution of marine strata in the area, combining with dating and modern remote sensing image data, the change of sea level in Weibei Plain since Holocene has been summarized, and 6 coast lines from 6000 a B.P. to 1989 AD. have been restored.