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长江三角洲北翼ZKA01钻孔第四纪晚期以来的沉积环境演化

刘宪光 杨晋炜 蒋仁 梁飞刚 夏斌 王钜 胡利 孙丰瑞 董军林

刘宪光,杨晋炜,蒋仁,等,2023. 长江三角洲北翼ZKA01钻孔第四纪晚期以来的沉积环境演化[J]. 地质力学学报,29(6):856−868 doi: 10.12090/j.issn.1006-6616.2023025
引用本文: 刘宪光,杨晋炜,蒋仁,等,2023. 长江三角洲北翼ZKA01钻孔第四纪晚期以来的沉积环境演化[J]. 地质力学学报,29(6):856−868 doi: 10.12090/j.issn.1006-6616.2023025
LIU X G,YANG J W,JIANG R,et al.,2023. Evolution of sedimentary environment at the ZKA01 borehole in the north wing of the Yangtze River Delta since late Quaternary[J]. Journal of Geomechanics,29(6):856−868 doi: 10.12090/j.issn.1006-6616.2023025
Citation: LIU X G,YANG J W,JIANG R,et al.,2023. Evolution of sedimentary environment at the ZKA01 borehole in the north wing of the Yangtze River Delta since late Quaternary[J]. Journal of Geomechanics,29(6):856−868 doi: 10.12090/j.issn.1006-6616.2023025

长江三角洲北翼ZKA01钻孔第四纪晚期以来的沉积环境演化

doi: 10.12090/j.issn.1006-6616.2023025
基金项目: 中国地质调查局地质调查项目(1212011220539 ,DD20230002)
详细信息
    作者简介:

    刘宪光(1984—),男,高级工程师,主要从事第四纪地质调查、水工环地质调查研究。E-mail:liuxgcugb@qq.com

  • 中图分类号: P534.63

Evolution of sedimentary environment at the ZKA01 borehole in the north wing of the Yangtze River Delta since late Quaternary

Funds: This research is financially supported by the Geological Survey Projects of the China Geological Survey (Grants No. 1212011220539 and DD20230002).
  • 摘要: 第四纪晚期以来的年代地层框架及海侵问题一直以来都是长江三角洲地区的研究热点。由于长江三角洲地区河道往复摆动、河流下切侵蚀导致地层频繁缺失,目前尚未在该地区同一个钻孔内发现完整的海侵记录。基于长江三角洲北翼东台地区ZKA01钻孔岩石地层、生物地层、古地磁年代学和光释光(OSL)测年研究,对比区域钻孔资料确定了该孔第四纪以来的地层年代框架,发现ZKA01钻孔完整地记录了晚更新世以来长江三角洲地区的5次海侵事件。结果表明,ZKA01孔B/M界线位置在108.00 m处,M/G界线位置为300.25 m处。中、上更新统界线位于第Ⅲ海相层底部,即92.95m处。上更新统与全新统界线置于该钻孔发现的第Ⅰ海相层底部,即16.65m处。晚更新世以来,前3次海侵发生在MIS5(128~74 ka)阶段,其中MIS5.1海侵规模较大,仅次于全新世时期的海侵规模。第4次海侵发生在MIS3阶段(60~24 ka),在深度上和年代上相当于MIS3时期的“第Ⅱ海相层”。第5次海侵发生在MIS1(12 ka至今)阶段,沉积环境为滨岸浅水的浅海环境,该次海侵规模最大。同时发现MIS5阶段初次海侵记录在该地区各钻孔埋深大致相当,该界面可作为长江三角地区的地层划分与对比研究的标志性地层。以上研究成果对于长江三角洲地区第四纪晚期地层划分对比、沉积环境研究分析具有极其重要意义。

     

  • 图  1  钻孔位置图

    Figure  1.  Location map of boreholes

    图  2  ZKA01钻孔岩芯照片及MIS地层单元划分(0~240.00 m)

    Figure  2.  Photos and stratigraphic columns of the ZKA01 borehole (0–240.00 m)

    图  3  ZKA01钻孔岩芯照片(240.00~320.00 m)

    Figure  3.  Photos and stratigraphic columns of the ZKA01 core (240.00–320.00 m)

    图  4  ZKA01钻孔与其南侧ZKA02钻孔古地磁极性柱对比

    Figure  4.  Palaeomagnetizm columns, stratigraphic division and OSL dating data in the ZKA01 and ZKA02 boreholes

    图  5  ZKA01钻孔微体生物随深度分布变化图

    Figure  5.  The down-core variations of the microorganisms contents in the ZKA01 borehole

    图  6  长江三角洲北翼晚第四纪海侵层对比图

    Figure  6.  Comparison of Late Quaternary Marine transgressions in the north wing of the Yangtze River Delta

    表  1  ZKA01钻孔光释光测年数据

    Table  1.   OSL dating data of the ZKA01 borehole

    样品编号岩性特征深度/m等效剂量
    /Gy
    年剂量
    Gy/ka
    含水量/%年龄/ka
    14G−172粉砂 58.90140.27±3.833.14±0.1322.344.6±2.2
    14G−173粉细砂88.10284.63±7.013.25±0.1324.787.5±4.1
    14G−174粉砂 133.10410.73±11.703.82±0.1522.9107.5±5.3
    14G−175粉细砂169.90578.59±1.343.43±0.1416.5168.7±6.8
    下载: 导出CSV
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  • 收稿日期:  2023-03-07
  • 修回日期:  2023-06-21
  • 录用日期:  2023-09-12

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