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安达曼海东部凹陷渐新世以来断裂-构造演化特征及其成因探讨

闫恒 栾锡武 李振春 叶传红 魏新元 贺华瑞

闫恒,栾锡武,李振春,等. 安达曼海东部凹陷渐新世以来断裂-构造演化特征及其成因探讨[J]. 海洋学报,2022,44(x):1–14 doi: 10.12284/hyxb2022067
引用本文: 闫恒,栾锡武,李振春,等. 安达曼海东部凹陷渐新世以来断裂-构造演化特征及其成因探讨[J]. 海洋学报,2022,44(x):1–14 doi: 10.12284/hyxb2022067
Yan Heng,Luan Xiwu,Li Zhenchun, et al. Evolution characteristics and genesis of fault-structure in the Eastern Andaman Sea Depression since the Oligocene[J]. Haiyang Xuebao,2022, 44(x):1–14 doi: 10.12284/hyxb2022067
Citation: Yan Heng,Luan Xiwu,Li Zhenchun, et al. Evolution characteristics and genesis of fault-structure in the Eastern Andaman Sea Depression since the Oligocene[J]. Haiyang Xuebao,2022, 44(x):1–14 doi: 10.12284/hyxb2022067

安达曼海东部凹陷渐新世以来断裂-构造演化特征及其成因探讨

doi: 10.12284/hyxb2022067
基金项目: 中国-东盟海上合作基金项目“东盟-海洋地震数据平台与研究中心建设”( 12120100500017001);国家自然科学基金(92055211,42006067)
详细信息
    作者简介:

    闫恒(1997-),男,主要从事海洋地球物理勘探研究工作。E-mail:1002941347@qq.com

    通讯作者:

    栾锡武(1966-),男,山东省青岛市人,研究员,主要从事海洋地质地球物理研究。E-mail:xluan@sdust.edu.cn

Evolution characteristics and genesis of fault-structure in the Eastern Andaman Sea Depression since the Oligocene

  • 摘要: 本文研究内容为印度洋东北部边缘海安达曼海的构造演化。利用安达曼海域东部大范围二维地震数据资料及钻井数据,结合区域地质概况以及前人研究成果,选取8条具有代表性的断层并将其划分为一级和二级断裂,运用生长指数法和古落差法对断层进行定量分析,再通过计算安达曼海东部凹陷四条主测线的构造沉降量,探讨构造演化过程。结果表明:选取的生长断层中3条属于一级断裂,跨度大,几乎切穿整个地层,属于控制安达曼海域地区沉降的大断裂;另外5条属于二级断裂,控制构造带的展布情况,属于构造带的分界线。渐新世时期,印度–澳大利亚板块与欧亚板块之间处于软碰撞阶段,断层发育缓慢,上下盘落差较小,生长指数与构造沉降量也处于低值;中新世时期,板块之间的耦合效应不断增强,断层发育速度加快,此时上下盘厚度最大,是形成多处断裂带以及多种断裂样式的关键时期,各地层生长指数和构造沉降量也达到峰值。上新世至今,安达曼海沟–弧–盆体系逐渐稳定,断层活动减弱,断裂上下盘厚度差基本一致,生长指数差异较小,构造沉降量基本稳定在 1 km 左右。
  • 图  1  安达曼海构造单元划分(据文献[5-6]修改)

    Fig.  1  Division of tectonic units in Andaman Sea (Modified from reference [5-6])

    图  2  安达曼海地层沉积柱状图(据文献[1, 5, 8]修改)

    Fig.  2  Stratigraphic and sedimentary bars of the Andaman Sea (Modified from reference [1, 5, 8])

    图  3  研究区测线分布(据文献[6]修改)

    Fig.  3  Survey line distribution in the study area (Modified from reference [6])

    图  4  断层二维分布(位置见图3)

    Fig.  4  Typical faults are distributed in two dimensions (The location is shown in figure 3)

    图  5  断裂组合样式(具体位置见图4)

    Fig.  5  Fault assemblage pattern (The location is shown in figure 4)

    图  6  F1–F8断层生长指数和落差分析

    Fig.  6  F1-F8 fault growth index and drop analysis

    图  8  M1507_15测线

    Fig.  8  Line of M1507_15

    图  9  典型剖面构造沉降量

    Fig.  9  Tectonic settlement amount of typical section

    图  7  M1507_03测线

    Fig.  7  Line of M1507_03

    图  10  安达曼海构造演化过程(据文献[26, 30]修改)

    Fig.  10  Tectonic evolution of the Andaman Sea (Modified from reference [26, 30])

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  • 网络出版日期:  2022-04-27

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