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    南沙海域新生代构造特征和沉降演化

    赵中贤 孙珍 陈广浩 张云帆

    赵中贤, 孙珍, 陈广浩, 张云帆, 2011. 南沙海域新生代构造特征和沉降演化. 地球科学, 36(5): 815-822. doi: 10.3799/dqkx.2011.084
    引用本文: 赵中贤, 孙珍, 陈广浩, 张云帆, 2011. 南沙海域新生代构造特征和沉降演化. 地球科学, 36(5): 815-822. doi: 10.3799/dqkx.2011.084
    ZHAO Zhong-xian, SUN Zhen, CHEN Guang-hao, ZHANG Yun-fan, 2011. Cenozoic Structural Characteristics and Subsidence Evolution in Nansha. Earth Science, 36(5): 815-822. doi: 10.3799/dqkx.2011.084
    Citation: ZHAO Zhong-xian, SUN Zhen, CHEN Guang-hao, ZHANG Yun-fan, 2011. Cenozoic Structural Characteristics and Subsidence Evolution in Nansha. Earth Science, 36(5): 815-822. doi: 10.3799/dqkx.2011.084

    南沙海域新生代构造特征和沉降演化

    doi: 10.3799/dqkx.2011.084
    基金项目: 

    中国科学院知识创新工程重要方向项目群项目 KZCX2-YW-Q05-04

    国家重点基础研究发展计划“973计划”项目 2007CB41170405

    国家科技重大专项 2008ZX05025-005

    详细信息
      作者简介:

      赵中贤(1985—), 男, 博士研究生, 从事大陆边缘研究和盆地分析. Email: zxzhao@scsio.ac.cn

    • 中图分类号: P736.1

    Cenozoic Structural Characteristics and Subsidence Evolution in Nansha

    • 摘要: 为了认识南沙海域新生代的整体沉降规律, 对覆盖南沙海域的5条地震剖面进行了构造分析和沉降计算.结果表明, 南沙海域大部分伸展断层活动到T40 (16Ma) 和T60 (23.8Ma), 而T60 (23.8Ma) 前的构造沉降表现为断陷盆地特征, T60后为坳陷特征, 所以T60 (23.8Ma) 应为南沙海域大的构造转换面; 南沙海域的沉降中心出现在NE向南沙海槽的延伸带上, 它和前缘的逆冲推覆体一起成为南沙海域最显著的特征; 由逆冲推覆体的构造和地层特征判断其形成于T40 (16Ma) 后, 构造沉降速率拟合曲线也表明, 南沙海域在T40 (16Ma)—T32 (10.2Ma) 受到SE端的挤压和负载最强烈, 产生宽约200km的相对隆升, 并伴生有火山、张裂活动, 因此, T40 (16Ma) 可能是南沙海域区域应力场由伸展向挤压转换的界面; 上新世-第四纪(5.3~0Ma) 是南沙海域的快速构造沉降期, 可能与SE端的挤压强度减弱有关.

       

    • 图  1  研究区主要盆地和地震测线位置

      Fig.  1.  Location of major basins and seismic profiles

      图  2  南沙海域主要盆地地层柱状图

      Fig.  2.  Strata histogram of major basins

      图  3  典型地震剖面

      Fig.  3.  Typical seismic profile

      图  4  5条测线的构造沉降

      Fig.  4.  Tectonic subsidence curves of 5 lines

      图  5  94N7测线深度剖面(a) 及构造沉降速率拟合曲线(b) (R2为相关系数, 下同)

      Fig.  5.  Depth profile (a) and fitted subsidence rate curve (b) of line 94N7

      图  6  由盆地正反演拟合的岩石圈伸展系数

      沿94N7测线岩石圈裂陷结束时(23.8 Ma) 基底深度(a) 及岩石圈伸展系数(b)

      Fig.  6.  Lithospheric stretching factor modeled by basin forward and reverse method

      图  7  剩余构造沉降速率及岩石圈挠曲

      Fig.  7.  Remnant subsidence rate and flexure of lithosphere

      图  8  隆起上的伴生火山和断裂(位置如图 5中的虚线框所示)

      Fig.  8.  Volcano and faults on uplift

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    • 收稿日期:  2011-05-02
    • 刊出日期:  2011-09-15

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