渤海湾西南岸古黄河三角洲全新世地层层序和演化过程  

HOLOCENE SEQUENCE STRATIGRAPHY AND EVOLUTION OF THE ANCIENT YELLOW RIVER DELTA IN SOUTHWESTERN COAST OF THE BOHAI BAY

作　　者：胥勤勉[1] 胡云壮[1] 袁桂邦[1] 张振克[2] 杨吉龙[1] 潘桐[1] 

机构地区：[1]天津地质矿产研究所,天津300170 [2]南京大学地理与海洋科学学院、海岸与海岛开发教育部重点实验室,南京210093

出　　处：《第四纪研究》2015年第2期326-339,共14页Quaternary Sciences

基　　金：中国地质调查局地质调查项目（批准号：12120114007801和1212010610408）资助

摘　　要：对渤海湾西南岸6个钻透全新统的钻孔进行了详细的沉积学研究和年代测定，利用160个粒度和94个微体古生物样品共同确定沉积相，并利用22个泥炭的常规。℃年代，依据层序地层学原理划分了全新世地层层序，恢复了演化过程。渤海湾西南岸全新世黄河三角洲地层主要包括海侵层序、高海面层序和加积层序，海侵层序包括滨海沼泽、滨海砂坝和下切河谷，时代为8．5kaB．P．至全新世底界；高海面层序下段西部为滨海湖沼和积水洼地等滨海相，东部为潮成沙脊、前三角洲和潮下带等海相，时代为7．6～8．5kaB．P．；高海面层序上段西部为河间洼地、沼泽和分支河道等泛滥平原相，东部为河口砂坝、潮间带和潮成沙脊，时代为3．0～7．1kaB．P．；加积层序主要为分支河道、决口扇和河间洼地等沉积相，时代为3．OkaB．P．至今。渤海湾西南岸在9．0kaB．P．开始受海水影响，形成滨海湖沼；7．1～7．6kaB．P．达到最大海侵，位于旧城和盐山之间；海岸线于5．6kaB．P．时位于黄骅苗庄贝壳堤一带，于3．OkaB．P．时位于YS4和NP3孔之间，于2．0kaB．P．时形成现今岸线。古黄河于8．5-9．0kaB．P．时经YS3孔和NPl孔人海；于7．6-8．5kaB．P．时经YS4和NP3孔人海，于1．9-2．6kaB．P．时经YS7和NPl孔人海。5．6～7．1kaB．P．时期，研究区为当时古黄河三角洲的侧翼，形成河口砂坝，废弃之后形成潮成沙脊和苗庄贝壳堤。1．9kaB．P．至今，黄河在研究区外侧人海。To study Holocene evolution of the ancient Yellow River delta in southwestern coast of the Bohai Bay, 6 boreholes penetrated Holocene strata have been detailed sedimentological and chronological studied. 160 samples for grain size and 94 samples for micropaleontological analysis are used to establish sedimentary facies, 22 conventional 14C ages are used to establish exact age frame. Holocene sequence stratigraphy has been devided by the theory of sequence stratigraphy, and evolution of the ancient Yellow River delta has been recovered. Holocene sequence stratigraphy of the ancient Yellow River delta include of transgressive sequence, sea-level highstand sequence and retrograding sequence, transgressive sequence has main three sedimentary facies, such as coastal marsh, coastal sand bank and incised valley, and its age is form the begin of Holocene to 8.5ka B.P. （lka B.P.= 1000cal.a B.P.）. The lower sea-level highstand sequence contains mainly littoral facies in the west, such as coastal marsh and soak lowland, and mainly marine facies in the east, such as tidal sand ridge, prodeha and subtidal zone and so on, and its age is form 8.5ka B.P. to 7.6ka B.P. The upper sea-level highstand sequence contains mainly flood plain facies in west, such as interfluvial lowland, wetland and branch channel, mainly marine facies in the east, such as intertidal flat, river mouth bar, and tidal sand ridge, and its age is form 7. lka B.P. to 3.0ka B.P. Retrograding sequence has branch channel, interfluvial lowland and crevasse splay, and its age is form 3.0ka B.P. to now. 9.0- 10.2ka B.P., the shoreline reached to the northern modern Yellow River delta from the middle of the Bohai Bay, littoral facies had formed in study area. 8.5-9. Oka B.P., the Yellow River had formed incised valley from YS3 to NP1, and formed the dual-texture included coastal marsh and coastal sand bank on both sides of the valley. 7.6-8.5ka B.P., the Yellow River passed YS4 into the sea, and formed under-water channel and estuary. 7.1-7.6ka B.P. was the ma

关 键 词：渤海湾西南岸 古黄河三角洲 地层层序 全新世 

分 类 号：P722.4[天文地球—海洋科学] P736.22