D219孔和渤海湾北部晚第四纪地质环境  

THE HOLE D219 AND THE LATE QUARTERNARY PALEOGEOGRAPHIC ENVIORMENTS IN THE NORTHERN BOHAI BAY,CHINA

作　　者：胡广元 庄振业[2] 印萍[3] 赵东波 刘爽[2,6] 王玲 

机构地区：[1]青岛出版社,青岛266061 [2]中国海洋大学海洋地球科学学院,青岛266100 [3]中国地质调查局青岛海洋地质研究所,青岛266071 [4]福建海洋研究所,厦门361000 [5]福建省海岛与海岸带管理技术研究重点实验室,厦门361013 [6]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100 [7]山东省临沂市地震局,山东临沂276000

出　　处：《海洋地质前沿》2017年第6期16-23,共8页Marine Geology Frontiers

基　　金：国土资源大调查项目"中荷海岸带全球变化响应的比较研究"(1212010911072);福建省海岛与海岸带管理技术研究重点实验室项目(CIMIS-201601)

摘　　要：对渤海湾北部D219孔岩心样品进行了沉积地层学、生物地层学和年代地层学分析测试,将该孔自上而下划分为海相—滨海相、陆相、海相、陆相4个地层,按单井划相方法阐述了本区晚第四纪层序沉积历史。39ka BP所处的时期相当于献县海侵,本区的陆地平原被淹没;23ka BP海水退出渤海,本区又成为陆地;8~9ka BP(或8.5ka BP)海水再次侵入本区至今。以D219孔为主,与本区30余孔进行对照认为,本区在全新世海侵前是低缓平原,东西向总坡度约1.7‰,其上分布南堡和歧口两古河道系统。前者河宽小、曲率小,是流量较小的平原河系;后者河宽大、曲流汊道多,是流量较大的自SW向NE流的河系。Lithological,biological and chronological stratigraphic studies are carried out for the hole D219 which is located at the northern Bohai Bay.The deposits of the hole may be divided into four sets,i.e.marine-littoral facies,continental facies,marine facies and continental facies again in a descending order.Single well facies analysis reveals that seawater invaded into the northern Bohai Bay at 39 ka BP,corresponding to the Xian Country Transgression.It then retreated from the Bohai Sea at23 ka BP.Around 8.5ka BP the research area was covered by seawater again.Based on the data from D219 and another 30 boreholes,it is concluded that the northern Bohai Bay was a plain in Late Quaternary with two paleochannel systems.The topographic gradient of the plain is no more than 1.7‰.The Nanpu River was small,but the Qikou River flowing from southwest to northeast was a meandering river with high discharge and multiple branches.

关 键 词：渤海湾北部 晚第四纪 地层 古地形 古河道 

分 类 号：P67[天文地球—海洋地质]