渤海湾西岸CH500孔磁性地层年代研究

发布时间：2018-02-09 22:36

  本文关键词： 磁性地层学 沉积速率 构造活动 渤海湾西岸　出处：《海洋地质与第四纪地质》2016年04期 　论文类型：期刊论文

【摘要】：对渤海湾西岸孔深503.22m的CH500孔进行了详细的磁性地层学研究,基于377个交变退磁样品分离出的特征剩磁,建立了钻孔的磁性地层,并与标准极性年表相对比,确定了极性时和极性亚时,在此基础上探讨了该孔年代地层划分及其区域构造意义。结果表明:本钻孔B/M界限深度119.5m,M/G界限深度为359.1m,钻孔底部位于C2An.2r内,其年龄应小于3.33 Ma。通过与渤海湾西北岸的其他钻孔对比,发现各钻孔的B/M界限深度和M/G界限深度存在较大的不同,反映了不同的级次构造单元地层厚度的差异。这一研究为该钻孔提供了可靠的年代标尺,为渤海湾西岸第四系地层划分和对比提供了新的依据。
[Abstract]:A detailed magnetic stratigraphic study of the CH500 hole with a depth of 503.22m in the west coast of Bohai Bay has been carried out. Based on the characteristic remanence of 377 alternating demagnetization samples, the magnetic strata of the borehole have been established and compared with the standard polarity chronograph. Based on the determination of polarity time and polarity sub-time, the chronostratigraphic division of the borehole and its regional tectonic significance are discussed. The results show that the B / M boundary depth of this borehole is 119.5 m / M / G limit depth is 359.1 m, and the bottom of the borehole is located within C _ 2An.2r. Its age should be less than 3.33 Ma.Through comparison with other boreholes in the northwestern coast of Bohai Bay, it is found that the B / M boundary depth and M / G boundary depth of each borehole are quite different. This study provides a reliable age scale for the borehole and provides a new basis for the division and correlation of the Quaternary strata in the west coast of Bohai Bay.
【作者单位】： 天津地质矿产研究所;Centre
【基金】：中国地质调查“天津滨海新区地质环境调查评价(1212011120089)”项目
【分类号】：P539.3;P736.22
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本文编号：1499017