渤海湾全新世贝壳堤：时空分布和海面变化标志点  

Holocene cheniers:spatial and temporal distribution and sea level indicators in Bohai Bay

作　　者：苏盛伟[1,2] 商志文[1] 王福[1] 王宏[1] 

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]吉林大学地球科学学院．吉林长春130061

出　　处：《地质通报》2011年第9期1382-1395,共14页Geological Bulletin of China

基　　金：中国地质调查局项目《泥质海岸带对全球变化的响应与趋势预测》(编号:1212010911069);国家自然科学基金项目《海平面升高与气温的耦合与非耦合关系》(批准号:40742011)

摘　　要：以他人和本研究小组对渤海湾西岸贝壳堤平原的全新世贝壳堤研究为基础,重新考订了贝壳堤的底板形态,发现底板多向海倾斜,经多处水准测量获得的前、后缘底板平均高差为1m。堤底板的前、后缘位于形成时的平均大潮潮差的垂直范围内。底板的高差,或依实测值、或依高差平均值补足至1m,由此确定底板的高度误差范围。当对应当时的平均大潮差时,再进一步补足至±1.5m的垂直范围,堤底板遂成为海面变化标志点。经过对96个14C数据的考订,补正了贝壳堤的时空分布,重新肯定了Ⅱ堤的2道支堤和隋唐堤的存在,提出Ⅰ堤二分的可能,揭示了风暴潮再搬运造成的Ⅰ堤中部老于下部—底部的年龄倒置原因。该研究是重建贝壳堤平原全新世相对海面变化曲线、探讨贝壳堤与气候变化关系的基础。Based on studies of the Holocene cheniers on the Chiner Plain along the west coast of Bohai Bay,this paper has reexamined the bottom morphology of cheniers and found that the bottom usually inclines seaward with average vertical difference of 1m between front-foot and rear-base,as evidenced by leveling measurements at various sites.Both fore-base and rear-base were developed within the vertical range of the contemporaneous mean high tides.Thus,the indicative range of the bottom is defined by either actually measured value or 1m complement.Further complement to ±1.5m is needed if the bottom should correspond to the vertical range of mean high tides.With reexamination of 96 14C data,each period of the chenier trends is determined,and the Ⅱ-1 and Ⅱ-2 as two branches of the Chnier Ⅱ as well as the Sui-Tang（S-T） Chenier are reconfirmed.The Chenier Ⅰcan be also subdivided into two branches as Ⅰ-1 andⅠ-2.The storm-surge transportation responsible for the time-reversal phenomenon that middle part was older than the lower part in the ChenierⅠhas been revealed.Consequently,the temporal and spatial distribution of cheniers is improved in this paper.This research provides a basis for reconstructing the local Holocene relative sea level curve and approaching its relationship with climate changes in the Chenier Plain.

关 键 词：贝壳堤时空分布 贝壳堤底板 海面变化标志点 渤海湾 

分 类 号：P534.632[天文地球—第四纪地质学] P736[天文地球—古生物学与地层学]