渤海湾西岸全新统沉积特征及环境演化

发布时间：2018-03-13 13:09

本文选题：环境演化　切入点：沉积特征　出处：《海洋地质与第四纪地质》2017年01期 　论文类型：期刊论文

【摘要】：在研究区已施工22个钻孔及47处陡坎剖面调查基础上,详细研究了本区全新世地层的沉积物特征、沉积环境及其空间展布形态;认为本区全新统为一套由陆相-海相-陆相交互沉积的松散沉积物,成因类型主要为冲积、湖沼沉积以及海积,沉积相主要为分支河道、边滩、泛滥平原、潮汐河道、潮间带、潮上带、滨海湖沼等。受构造-气候事件影响,沉积物在横向上陆-海-陆交叉松散沉积叠加形似3个交错穿插的"楔形体";垂向上,沉积物粒度具正韵律层序,局部海侵层可见反韵律层序。总体上反映该区全新世以来陆—海交互作用及海进—海退演变历程。
[Abstract]:Based on the investigation of 22 boreholes and 47 steep ridges in the study area, the sediment characteristics, sedimentary environment and spatial distribution of Holocene strata in this area are studied in detail. It is considered that the Holocene in this area is a set of loose sediments composed of continental, marine and continental facies. The genetic types are mainly alluvial, marsh and marine deposits, and the sedimentary facies are mainly branched rivers, banks, flood plains, tidal channels and intertidal zones. Under the influence of tectonic-climatic events, the sediments are superposed as three interlaced "wedges" in the transverse continental, oceanic and continental intersections, and vertically, the grain size of the sediments is in a positive rhythmic sequence. The reverse rhythmic sequence can be seen in local transgressive strata, which reflects the interaction between land and sea since Holocene and the evolution process of advance and regression in this area.
【作者单位】：天津华北地质勘查局地质研究所;天津市海洋地质勘查中心;
【基金】：天津市矿产资源补偿费项目(天津市蔡公庄乡等1:5万区域地质调查国土房任[2014]20号)
【分类号】：P736.21

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