渤海湾西北岸MIS3阶段以来的海侵特征  

Marine transgression since the MIS3 stage on the northwest coast of Bohai Bay,China

作　　者：黄猛 韩荣文[1,2] 牛毅 胥勤勉[3] HUANG Meng;HAN Rongwen;NIU Yi;XU Qinmian(Beijing-Tianjin-Hebei Plain Cangzhou Groundwater and Land Subsidence National Observation and Research Station,Cangzhou 061000,Hebei,China;Tianjin Institute of Geological Survey,Tianjin 300191,China;Tianjin Center,China Geological Survey,Tianjin 300170,China)

机构地区：[1]京津冀平原沧州地下水与地面沉降国家野外科学观测研究站,河北沧州061000 [2]天津市地质调查研究院,天津300191 [3]中国地质调查局天津地质调查中心,天津300170

出　　处：《地质通报》2021年第5期721-733,共13页Geological Bulletin of China

基　　金：中国地质调查局项目《河北怀安—内蒙凉城地区区域地质调查》(编号:DD20190035);《燕山-太行成矿带丰宁和天镇地区地质矿产调查》(编号:DD20160042)。

摘　　要：晚更新世以来渤海湾沿岸普遍出现三期海侵,不同学者通过钻孔以及古海岸遗迹分析探讨了渤海湾西岸、南岸晚更新世以来的海侵沉积演化及海平面变化,而渤海湾西北岸地区晚更新世海侵沉积特征、古生物特征及海侵层对比缺乏系统的研究。本文通过对渤海湾西北岸多个钻孔岩心进行年代学、沉积学和微体古生物研究,建立了研究区不同构造单元的40 m以浅的标准地层层序、年代格架,划分了微体古生物组合带。研究区MIS3阶段以来共发育两期海侵,MIS3阶段海侵年代为35210~37658 cal.a BP,MIS1阶段海侵年代为7050~11310 cal.a BP。受古气候变化、古地貌和新构造运动影响,两期海侵层的空间分布和岩相古地理特征差异明显,MIS1阶段海侵规模大于MIS3阶段,MIS1阶段海侵为潟湖沉积体系,MIS3阶段海侵为潮坪-河口砂坝沉积体系。Since Late Pleistocene,there have been three marine transgression in the coastal area of Bohai Bay.Different scholars have explored the marine transgression sedimentary evolution and sea level change in the western and southern coasts of Bohai Bay by analyzing borehole sediment and ancient coastal relics.There is a lack of systematic research on the borehole sediment characteristics of Late Pleistocene Marine transgression in the northwestern coast of Bohai Bay.Based on the study of chronology,sedimentology and microbody paleontology of several boreholes in the northwest coast of Bohai Bay,this paper established the standard stratigraphic sequence,chronological framework and micropalaeontological assemblage zone of 40 meters to light of different tectonic units in the research area.There are two stages of transgression in the study area since MIS3 stage.The transgression age of MIS3 stage was 35210~37658 cal.a BP and that of MIS1 stage was 7050~11310 cal.a BP.Due to the influence of palaeoclimate change,palaeogeomorphology and neotectonic movement,the spatial distribution and lithofacies paleogeographic characteristics of transgressive strata in the two periods are obviously different.The scale of transgression in MIS1 stage is larger than that in MIS3 stage.It was lagoon sedimentary system in MIS1 stage and it was tidal flat-estuarine sand bar sedimentary system in MIS3 stage.

关 键 词：渤海湾西北岸 海侵 最大海侵边界 沉积特征 

分 类 号：P534.631[天文地球—第四纪地质学] P512.2[天文地球—古生物学与地层学]