摘要
通过对辽东半岛大清河海岸平原的地貌考察和人工钻孔取样,对研究区内7个钻孔不同层位的113个样品进行了混浊水导电率测定;根据钻孔剖面海陆相沉积环境变化与导电率曲线特征值,推断出大清河海岸平原全新世时期海陆变化规律。结果表明:g1和g2的导电率曲线有2个明显的峰值,显示研究区发生了一次完整的海侵过程,且海水到达接近g3孔位置之处;另外,靠近陆侧的g3孔在海拔2.1 m处出现一小峰值,推测由于海水到达此处使得导电率变大,由此进一步得出研究区海侵时海平面(即平均高潮线)达到的最大高度为海拔接近2.1 m处,比现今海平面低1.0 m左右,说明全新世高海面之后,研究区表现为构造隆升。
Geomorphological survey are conducted and drilling samples are collected in the Daqing River coastal plain of the Liaodong peninsula.Totally 113 sedimentary samples from the corresponding depths of the 7 drilling cores are obtained to measure conductivity of pore water in the sediments.The regularity of the land-sea changes in the plain during Holocene can be deduced from both the environmental alternations between the terrestrial sedimentation and the marine sedimentation along the drilling profile,and the characteristics of the conductivity curves.It is shown in the results that there are 2 peaks in each of the conductivity curves respectively for the g1 and g2 drill holes.It means that a complete transgression has occurred in the studied area and the transgrassive sea level almost approached to the location of the g3 drill hole.In addition,a lower peak can be found in the curve for the g3 drill hole which is the most landward,and it corresponds to the 2.1 m above the contemporary sea level.Therefore it is deduced that the sea level reached there and the conductivity became higher.It is believed that the ancient sea level i.e.the ancient mean high water had its maximnm corresponding to the 2.1 m above the contemporary sea level.The ancient sea level was 1.0 m below the contemporary one.In other words,the studied area has become uplifted in tectonics since Holocene.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2010年第4期465-472,共8页
Advances in Marine Science
基金
国土资源部基金项目--辽宁省海岸带环境地质调查评价(40201052)
关键词
大清河海岸平原
混浊水导电率
海陆变迁
the Daqing River coastal plain
conductivity of the pore water in sediments
sea-land change
