南海北部海域中东部陆架坡折带类型与迁移演化及成因

黄文凯, 邱燕, 彭学超, 聂鑫, 卓海腾, 付潮罡

黄文凯, 邱燕, 彭学超, 聂鑫, 卓海腾, 付潮罡. 南海北部海域中东部陆架坡折带类型与迁移演化及成因[J]. 海洋地质与第四纪地质, 2021, 41(3): 1-11. DOI: 10.16562/j.cnki.0256-1492.2020060801
引用本文: 黄文凯, 邱燕, 彭学超, 聂鑫, 卓海腾, 付潮罡. 南海北部海域中东部陆架坡折带类型与迁移演化及成因[J]. 海洋地质与第四纪地质, 2021, 41(3): 1-11. DOI: 10.16562/j.cnki.0256-1492.2020060801
HUANG Wenkai, QIU Yan, PENG Xuechao, NIE Xin, ZHUO Haiteng, FU Chaogang. Types and migration of shelf-breaks in the central and eastern parts of the Northern South China Sea and their origin[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 1-11. DOI: 10.16562/j.cnki.0256-1492.2020060801
Citation: HUANG Wenkai, QIU Yan, PENG Xuechao, NIE Xin, ZHUO Haiteng, FU Chaogang. Types and migration of shelf-breaks in the central and eastern parts of the Northern South China Sea and their origin[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 1-11. DOI: 10.16562/j.cnki.0256-1492.2020060801

南海北部海域中东部陆架坡折带类型与迁移演化及成因

基金项目: 南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0501);中国地质调查局项目“中国海及邻域构造演化研究”(GZH201100205),“1:100万汕头幅(F-50)海洋区域地质调查”(GZH201100206),“南海文昌和东方海域1:25万海洋区域地质调查”(DD20190627),“南部海域1:100万海洋区域地质调查成果与应用研究”(DD20160138),“南海永兴岛海域1:5万海洋区域地质调查”(DD20190209)
详细信息
    作者简介:

    黄文凯(1986—),男,硕士,工程师,主要从事层序地层学、沉积学及地震资料解释的研究,E-mail:kevinwonghwk@outlook.com

    通讯作者:

    邱燕(1956—),女,博士,教授级高级工程师,主要从事石油地质、海洋地质和构造地质学研究,E-mail:zqiuyan60@163.com

  • 中图分类号: P736.2

Types and migration of shelf-breaks in the central and eastern parts of the Northern South China Sea and their origin

  • 摘要: 为了研究南海北部海域中、东部陆架坡折带在不同年代的迁移特征,分析了高精度单道地震剖面与地质浅钻等资料。在南海北部海域珠江口外区、东沙区和台湾浅滩区的陆架及陆坡带附近第四纪地层中,共识别出6个三级层序界面以及相应的沉积层序,同时识别了6个区域下切侵蚀面,并以此为依据认识了本区第四纪河道的演化特征,建立了层序地层格架。在此基础上,将该区第四纪陆架坡折带由西至东划分为建设型、侵蚀型和转换型三种类型,讨论了各段陆架坡折带的演化规律,提出构造地貌成因、水下河道发育与沉积物供给等作用均为控制陆架坡折带发育和迁移的主要因素。
    Abstract: This paper focuses on the types and characteristics of shelf-break migration in the Central and Eastern parts of the Northern South China Sea in the period of Quaternary. Based on the data of high-resolution seismic profiles and geological cores, six 3rd order sequences and their boundaries have been identified. Upon the basis, three types of shelf-breaks are recognized as well. They are the shelf-breaks on depositional continental margin, erosional continental margin and tectonic-controlled continental margin from west to east, formed by the joint action of tectonism, underwater channeling, sedimentary supply and other factors.
  • 图  1   研究区及本文所用资料位置图

    Figure  1.   The location map of the study area

    图  2   过STQ1-STQ2浅钻的地震剖面选段

    示层序界面特征,插图位置见图1

    Figure  2.   A selected seismic profile across cores STQ1 and STQ2 showing character of sequence boundaries

    图  3   STQ1、STQ2地质浅钻测年结果与深度关系

    Figure  3.   Dating results from the geological core STQ1 and STQ2

    图  4   南海北部海域中、东部陆架坡折类型划分与迁移演化

    Figure  4.   Shelf break types in the middle and east part of the northern South China Sea

    图  5   不同位置地震剖面,示陆架坡折类型

    测线位置见图1

    Figure  5.   Seismic profiles at different locations showing shelf break types

    图  6   地震剖面选段

    示内陆架区复合下切河谷,测线位置见图1

    Figure  6.   A selected seismic profile showing a compound incised valley on inner shelf

    图  7   南海北部海域东段第四系水下河道的变迁

    Figure  7.   Distribution of Quaternary incised valleys in the east part of the northern South China Sea

    图  8   海平面变化导致坡折线迁移对比示意图

    a. 海平面下降,b. 海平面上升。

    Figure  8.   Comparison of the migration of shelf-break caused by sea level change

    图  9   气候变化导致沉积速率差异对比示意图

    Figure  9.   Comparison of the difference in sedimentation rate caused by climate change

    表  1   单道地震测量工作参数

    Table  1   Parameters of single channel seismic survey

    调查船奋斗五号
    (陆架区/陆坡区)
    奋斗四号
    (陆坡区)
    激发方式等时/等距等时
    激发间隔2 s/25 m8 s
    震源能量2 000 J/210 in3210 in3
    记录长度/ms1500/60007000
    采样频率/Hz4000/2 0004000
    滤波范围/Hz160~1000/20~80020~1000
    震源放出长度/m4550
    电极沉放深度/m0.5~0.30.5~0.3
    电缆沉放深度/m0.5~10.5~1
    电极与电缆接收中心点间距/m9/914
    数据记录格式SEG-YSEG-Y
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-06-07
  • 修回日期:  2020-11-30
  • 网络出版日期:  2021-06-14
  • 刊出日期:  2021-06-27

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