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琼东南盆地北礁凹陷上新统等深流影响的(浊积)水道沉积体系

李俞锋 蒲仁海 樊笑微 张功成 赵学钦 鲍晶晶 李雅漠 王炯

李俞锋,蒲仁海,樊笑微,等. 琼东南盆地北礁凹陷上新统等深流影响的(浊积)水道沉积体系[J]. 海洋学报,2022,44(x):1–10 doi: 10.12284/hyxb2022116
引用本文: 李俞锋,蒲仁海,樊笑微,等. 琼东南盆地北礁凹陷上新统等深流影响的(浊积)水道沉积体系[J]. 海洋学报,2022,44(x):1–10 doi: 10.12284/hyxb2022116
Li Yufeng,Pu Renhai,Fan Xiaowei, et al. Pliocene channel sedimentary system influenced by bottom currents in Beijiao sag of Qiongdongnan basin, northern South China Sea[J]. Haiyang Xuebao,2022, 44(x):1–10 doi: 10.12284/hyxb2022116
Citation: Li Yufeng,Pu Renhai,Fan Xiaowei, et al. Pliocene channel sedimentary system influenced by bottom currents in Beijiao sag of Qiongdongnan basin, northern South China Sea[J]. Haiyang Xuebao,2022, 44(x):1–10 doi: 10.12284/hyxb2022116

琼东南盆地北礁凹陷上新统等深流影响的(浊积)水道沉积体系

doi: 10.12284/hyxb2022116
基金项目: 自然资源部海底矿产资源重点实验室公开基金(KLMMR-2018-B-07);国家科技重大专题“南海北部深水区大型生物礁滩分布与成藏条件分析”(2011ZX05025-006-02);国家自然科学基金重大项目(41390451)。
详细信息
    作者简介:

    李俞锋(1986-),男,博士,四川省南充市人,主要从事海洋沉积学及其油气效应方面的教学和科研工作。E-mail: 526376337@qq.com

  • 中图分类号: P736.21

Pliocene channel sedimentary system influenced by bottom currents in Beijiao sag of Qiongdongnan basin, northern South China Sea

  • 摘要: 等深流影响的水道沉积体系的沉积特征及其沉积过程是当前深水沉积学研究的热点、难点和前沿科学问题,但研究程度较为薄弱。该文以北礁凹陷上新统(地震反射T30-T20)为研究对象,利用覆盖北礁凹陷局部的三维地震资料,采用均方根属性、相干属性、时间域构造,再结合地震切片等方法,研究北礁凹陷深水区上新统斜交斜坡(走向)的特殊水道沉积体系特征及其沉积过程。研究发现该水道沉积体系分为早-晚两期,早期发育水道、片状和扇状溢堤沉积,晚期仅发育水道和片状溢堤沉积,其中扇状溢堤沉积仅发育在水道右侧弯曲处,片状溢堤沉积仅分布在水道左侧,水道始终与区域斜坡斜交,水道对称分布且无明显迁移现象。结合该时期北礁凸起发育等深流相关的丘状漂积体和环槽,认为该水道沉积体系特殊的形态主要受控于等深流与浊流交互作用的沉积结果:浊流流经水道,其上覆浊流溢出水道,形成溢岸浊流,在水道左侧,该溢岸浊流与等深流发生相向运动,被等深流“吹拂”到单侧,大面积分布,延伸千米,形成片状溢堤沉积,而在水道弯曲处(右侧),溢岸浊流与等深流发生相对运动,抑制溢岸浊流进一步扩展,形成相对小范围扇状溢堤沉积,该沉积结果与前人水槽实验结果相一致。
  • 图  1  等深流与浊流交互作用的两种类型

    a. 向等深流下游方向单向迁移的水道沉积体系模式(引自文献[3]);b. 向等深流上游方向单向迁移的水道沉积体系模式(修改自文献[16-18])

    Fig.  1  Two types of sediment models for the interaction between turbidite flows and contour currents

    a. Depositional model for unidirectional downstream migrating channel depositional system (cited from reference [3]); b: Depositional model for unidirectional upstream migrating channel depositional system (cited from reference [16-18])

    图  2  琼东南盆地构造单元(据文献[24])(a)与北礁凹陷三维区上新统上段(含水道沉积体系)的古地貌图(b)

    Fig.  2  Tectonic unit division (reference [24]) (a) and in the Qiongdongnan basin and 3D time structure map of the channel sedimentary system in 3D seismic survey of Beijiao area (b)

    图  3  琼东南盆地深水区深水区地层综合柱状图与沉积相(文献[29])、构造运动及演化(文献[24])、强振幅水道发育/分布层位(文献[15])、海平面变化(文献[27])

    Fig.  3  Stratigraphic synthetic column in the deep-water area of the Qiongdongnan basin, northern South China Sea. It shows characteristics of sedimentary facies (reference [29]), tectonic movement and evolution (reference [24]), development or distribution location of channels with high amplitudes (reference [15]), and eustatic sea level change (reference [27]) in the Qiongdongnan basin

    图  4  琼东南盆地北礁凹陷上新统早-晚期水道沉积体系剖面(a-c)特征及其沉积(结构)单元划分(b-c1)

    剖面位置图a、c见图1b,其中绿色实线“S”为早晚期水道沉积体系分界面

    Fig.  4  The seismic profiles showing characteristics (a-c) and sediment units divisions (b-c1) of the early-late channel sedimentary system in the upper Pliocene strata in the Beijiao sag, QDNB

    See locations in Fig. 1b and solid green line (“S”) presenting the boundary between early and late channel depositional systems

    图  5  琼东南盆地北礁凹陷上新统早-晚期水道沉积体系均方根属性(a、b)及其沉积相解释(a1、b1)

    图a时窗为(早晚期水道)分界面S至S下移(+)40 ms,图b时窗为分界面S至S下移(-)40 ms

    Fig.  5  RMS attributes (a, b) and their sedimentary facies interpretation (a1, b1) of the study area in the timings of the early-late channel sedimentary system in Pliocene in Beijiao sag, Qiongdongnan Basin

    图  6  琼东南盆地北礁凹陷早-晚期水道沉积体系相干属性平面图(a、b)及环槽与丘状漂积体发育特征(c)

    Fig.  6  Coherence attribute (a, b) of the early-late channel sedimentary system in the study area and the characteristics (c) of moats and contourites in the Beijiao uplift, Qiongdongnan Basin.

    图  7  等深流与浊流交互作用下浊流溢出堤岸的沉积模式及其水槽实验

    a. 沿斜坡的等深流与浊流互相垂直时的交互作用平面形态(修改自文献[8]);b. 由于浊流受到等深流的影响发生溢岸浊流,致哥伦比亚水道(扇)末端朵叶体向等深流下游方向迁移(修改自文献[8]);c. 等深流与浊流交互作用的水槽实验(修改自文献[34])

    Fig.  7  Sedimentary models of turbidity flows overflowing levees under the interaction of contour currents and turbidity flows

    a. Planform morphology of along-slope contour currents and across-slope turbidity follows (recited from reference [8]); b. Lobe at the end of Columbia channel (fan) migrating downstream of contour currents, due to overspills from turbidity flows affected by contour currents (recited from reference [8]). c. Flume-tank experiment of the interaction between contour currents and turbidity flows (recited from reference [34])

    图  8  琼东南盆地北礁凹陷受等深流影响的水道沉积体系沉积模式图

    Fig.  8  sedimentary model of the channel sedimentary system affected by contour currents in Beijiao sag, Qiongdongnan Basin

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出版历程
  • 收稿日期:  2021-04-14
  • 修回日期:  2022-02-11
  • 网络出版日期:  2022-04-25

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