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    南海西南次海盆地壳岩石圈伸展破裂过程的构造、沉积和岩浆作用记录

    任建业 罗盼 高圆圆 王后金 雷超 巢鹏

    任建业, 罗盼, 高圆圆, 王后金, 雷超, 巢鹏, 2022. 南海西南次海盆地壳岩石圈伸展破裂过程的构造、沉积和岩浆作用记录. 地球科学, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135
    引用本文: 任建业, 罗盼, 高圆圆, 王后金, 雷超, 巢鹏, 2022. 南海西南次海盆地壳岩石圈伸展破裂过程的构造、沉积和岩浆作用记录. 地球科学, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135
    Ren Jianye, Luo Pan, Gao Yuanyuan, Wang Houjin, Lei Chao, Chao Peng, 2022. Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea. Earth Science, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135
    Citation: Ren Jianye, Luo Pan, Gao Yuanyuan, Wang Houjin, Lei Chao, Chao Peng, 2022. Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea. Earth Science, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135

    南海西南次海盆地壳岩石圈伸展破裂过程的构造、沉积和岩浆作用记录

    doi: 10.3799/dqkx.2022.135
    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 GML2019ZD0208

    国家自然科学基金项目 41830537

    详细信息
      作者简介:

      任建业(1963-), 男, 教授, 博士生导师, 主要从事海洋地质学和沉积盆地动力学分析方面的教学和科研.ORCID: 0000-0003-0780-651X.E-mail: jyren@cug.edu.cn

    • 中图分类号: P736

    Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea

    • 摘要: 基于跨南海西南次海盆V型尖端区共轭被动大陆边缘的1 000 km长的深反射地震剖面的解释和分析,深入研究南海临界破裂区地壳结构、盆地构造地层格架和岩浆作用特征,阐明地壳岩石圈的伸展破裂过程.结果表明,在南海西南次海盆共轭陆缘可以识别出3条一级界面,即海底、基底(Tg/Tb)和Moho面,根据这些界面可将共轭边缘划分为箱型域、细颈域、楔型域和薄箱型域等多个地壳基底结构构造特征显著不同的构造单元;在西南次海盆V型尖端陆缘盆地充填序列中识别出岩石圈裂解分离的响应界面,即裂后不整合界面T50/Tm,该界面与基底面Tg/Tb限定了陆缘盆地的同裂陷沉积充填序列,其内发育了T70、T60两条重要的幕式构造响应界面,控制了早期高角度正断层控制的断陷盆地系(Tg-T70)、中期拆离断层控制的拆离盆地系(T70-T60)和晚期断坳转换作用控制的坳陷盆地(T60-T50);西南次海盆V型尖端薄箱型域属于原洋洋壳域,为岩浆型地壳,代表了岩石圈临近裂解分离、但支撑稳定态海底扩张的地幔对流系统还未完全建立起来之前的“临界破裂”状态,发育于23.5~15.5 Ma(T60-Tm)期间.综合考虑地壳初始厚度、断裂活动性和不同时期的盆地原型等,运用平衡剖面技术重建了西南次海盆V型尖端共轭边缘的发育演化过程,建立了南海西南次海盆临界破裂区构造-地层-岩浆相互作用模式,揭示了南海陆缘岩石圈伸展破裂机制.本研究具有重要的理论意义,并对南海的深水油气勘探具有重大的实际应用价值.

       

    • 图  1  研究区和测线Line A的位置

      Fig.  1.  The research area and the location of Line A

      图  2  Line A测线剖面构造地层解释图和深度剖面图(测线位置见图 1)

      a.地震剖面; b.解释的时间剖面; c.转换的深度剖面(带解释)

      Fig.  2.  The structural stratigraphic interpretation and depth section of Line A (location see Fig. 1)

      图  3  V型尖端重力异常和构造单元划分(位置见图 1

      Fig.  3.  The gravity anomaly and division of structural domains in the V-shaped tip (location see Fig. 1)

      图  4  Line A测线共轭陆缘线描图(a、b);地壳基底和陆缘盆地构造地层解释图(c、d)(位置见图 2

      Fig.  4.  Line drawing of part of Line A (a, b); the interpretation of interfaces and structures and nature of basement and sedimentary sections(c, d)(location see Fig. 2)

      图  5  Line A测线构造演化史重建

      Fig.  5.  The back striping structural evolution of Line A

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