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    珠江口盆地深水区23.8 Ma构造事件地质响应及其形成机制

    吴景富 张功成 王璞珺 谢晓军 胡圣标 漆家福

    吴景富, 张功成, 王璞珺, 谢晓军, 胡圣标, 漆家福, 2012. 珠江口盆地深水区23.8 Ma构造事件地质响应及其形成机制. 地球科学, 37(4): 654-666. doi: 10.3799/dqkx.2012.075
    引用本文: 吴景富, 张功成, 王璞珺, 谢晓军, 胡圣标, 漆家福, 2012. 珠江口盆地深水区23.8 Ma构造事件地质响应及其形成机制. 地球科学, 37(4): 654-666. doi: 10.3799/dqkx.2012.075
    WU Jing-fu, ZHANG Gong-cheng, WANG Pu-jun, XIE Xiao-jun, HU Sheng-biao, QI Jia-fu, 2012. Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea. Earth Science, 37(4): 654-666. doi: 10.3799/dqkx.2012.075
    Citation: WU Jing-fu, ZHANG Gong-cheng, WANG Pu-jun, XIE Xiao-jun, HU Sheng-biao, QI Jia-fu, 2012. Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea. Earth Science, 37(4): 654-666. doi: 10.3799/dqkx.2012.075

    珠江口盆地深水区23.8 Ma构造事件地质响应及其形成机制

    doi: 10.3799/dqkx.2012.075
    基金项目: 

    国家科技重大专项 2008ZX05025-002

    详细信息
      作者简介:

      吴景富(1963-),男,博士,教授级高级工程师,主要从事海洋石油天然气勘探和深水油气地质的相关研究工作.E-mail: wujf1@cnooc.com.cn

    • 中图分类号: P542

    Geological Response and Forming Mechanisms of 23.8 Ma Tectonic Events in Deepwater Area of the Pearl River Mouth Basin in South China Sea

    • 摘要: 南海珠江口盆地深水区23.8 Ma发育一次重大构造事件并同时形成了重要的不整合界面.研究表明:(1)23.8 Ma构造事件是珠江口盆地珠二坳陷新生代构造演化的转换面,它是盆地裂陷阶段和裂后阶段的分界面,23.8 Ma之前为断裂控盆,盆地以伸展和走滑断裂系统为主;23.8 Ma之后为断裂和热作用共同控盆,到晚期以热作用为主.(2)23.8 Ma构造事件导致盆地沉积充填的突变,通过微量元素和同位素分析,23.8 Ma以前盆地物源来自东南沿海花岗岩源区,23.8 Ma以后物源来自青藏东侧及云贵高原源区.23.8 Ma界面是南海北部陆架坡折从白云主凹南侧向北侧跳跃的分界面,相应地沉积环境由浅海陆架沉积突变为陆坡深水沉积环境.(3)23.8 Ma构造事件是盆地热体制的转折面,典型钻井热史定量恢复揭示地温梯度在23.8 Ma附近明显存在一个突变面,以23.8 Ma为界,新生代早期到渐新世末显示地温梯度上升,指示盆地经历了拉张过程;23.8 Ma之后显示地温梯度下降,指示盆地经历热沉降过程.(4)23.8 Ma构造事件是火山活动的转化面,23.8 Ma之前显示成分单一的大规模玄武质岩浆喷发作用逐渐增强,而之后玄武质岩浆喷发作用逐渐减弱.总结了23.8 Ma构造事件的动力学模型,提出了软流圈流动主导的地幔热底辟作用是南海破裂成洋的动力来源,南海扩张脊的跃迁及地幔热底辟作用改变是导致23.8 Ma构造事件的主因.

       

    • 图  1  珠江口盆地深水区及其周边区域构造划分

      Fig.  1.  Structural units of deepwater and its surrounding area in the Pearl River Mouth basin

      图  2  珠江口盆地深水区构造演化剖面

      Fig.  2.  Structural evolution of deepwater area in the Pearl River Mouth basin

      图  3  珠江口盆地深水区新生代盆地构造样式及其分布模式

      Fig.  3.  Cenozoic structural and distribution pattern of deepwater area in Pearl River Mouth basin

      图  4  LW3-1-1井沉积物微量元素变化特征

      Fig.  4.  Trace elements variation of sediment in LW3-1-1

      图  5  南海周边及可能源区Nd同位素分布示意

      Fig.  5.  Distribution of isotope Nd in South China Sea and other possible provenance

      图  6  PY33-1-1井(a)及1148站(b)钕及锶同位素演变特征及可能源区

      Fig.  6.  Evolution of isotope Nd and Sr in PY33-1-1 (a) and 1148 (b), and possible provenance

      图  7  珠江口盆地近南北向地震解释剖面及陆架坡折迁移示意

      Fig.  7.  Interpreted longitudinal seismic profile showing the migration of slope break of the Pearl River Mouth basin

      图  8  珠江口盆地钻井古地温剖面

      Fig.  8.  Drilled paleo geothermal profile in Pearl River Mouth basin

      图  9  珠江口盆地单井热历史

      Fig.  9.  Thermal history of drilled wells in Pearl River Mouth basin

      图  10  珠江口盆地及邻区新生代火山岩平面分布

      Fig.  10.  Distribution of Cenozoic volcanic rocks in Pearl River Mouth basin and its adjacent area

      图  11  珠江口盆地火山活动与盆地演化、区域构造关系

      Fig.  11.  The relationship between volcanic activities, basin evolution, and regional structure in Pearl River Mouth basin

      图  12  南海北部大陆边缘新生代动力学模型

      Fig.  12.  Cenozoic geodynamic model of continental margin in the north of South China Sea

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