Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea
Sediment waves on the South China Sea Slope off southwestern Taiwan: Implications for the intrusion of the Northern Pacific Deep Water into the South China Sea
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台湾西南部南海斜坡上的沉积物波：对北太平洋深水侵入南海的影响
DOI：
10.1016/j.marpetgeo.2011.12.005
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发表时间：
2012-04
影响因子：
4.2
通讯作者：
Xu, Shang
中科院分区：
文献类型：
--
作者：
Gong, Chenglin;Wang, Yingmin;Peng, Xuechao;Li, Weiguo;Qiu, Yan;Xu, Shang
目前的研究利用集成的多波束测深、高分辨率地震剖面、活塞岩芯和 AMS14C 测年数据集，在台湾西南部的南海斜坡上确定了两个沉积波场，即场 1 和场 2。场1位于下坡，场内沉积波总体方向垂直于下坡重力流方向和峡谷轴线。几何形状、形态和内部地震反射配置表明，1 号场的沉积物波经历了显着的上坡迁移。相比之下，2 号油田位于更靠近盆地的地方，位于大陆隆起处。与在场 1 中观察到的不对称形态和不连续反射不同，场 2 中的沉积物波表现出更对称的形态和可以从一个波追踪到另一个波的连续反射，这表明垂直加积比上坡迁移更活跃和占主导地位。在场 1 和场 2 中均确定了三个沉积波演化阶段，即阶段 1 到阶段 3。在阶段 1 期间，沉积物波建立在区域不整合面之上，该区域不整合面将下方的物质传输复合体与上覆的沉积物波分开。在这两个区域中，从最古老的第 1 阶段到最年轻的第 3 阶段，沉积物波逐渐发展，波尺寸增加，尽管在这三个阶段中，上坡迁移在区域 1 中占主导地位，而垂直加积在区域 2 中占主导地位。综合数据和沉积模型表明，研究区上坡受到下坡重力流的强烈切割和侵蚀。强烈侵蚀的最终结果是，大量沉积物通过重力流和/或浊流进一步向盆地输送到较低的斜坡。这些洋流与北太平洋深水侵入南海引起的底部（等高线）洋流以及下部斜坡中预先存在的波状地形的相互作用，导致了场 1 中的上坡迁移沉积物波以及从岩心 TS01 和 TS02 观察到的等高线。在大陆隆起进一步向盆地延伸时，浊流减弱和稀释，而沿坡底（等高线）流强劲，很可能主导稀释的浊流，导致场 2 中沉积波的垂直加剧。这项研究的结果也为北太平洋深水侵入南海提供了进一步的证据，表明这种侵入可能已经存在并能够影响南海的沉积。 南海至少自第四纪以来。
Using an integrated multi-beam bathymetry, high-resolution seismic profile, piston core, and AMS14C dating data set, the current study identified two sediment wave fields, fields 1 and 2, on the South China Sea Slope off southwestern Taiwan. Field 1 is located in the lower slope, and sediment waves within it are overall oriented perpendicular to the direction of down-slope gravity flows and canyon axis. Geometries, morphology, and internal seismic reflection configurations suggest that the sediment waves in field 1 underwent significant up-slope migration. Field 2, in contrast, is located more basinward, on the continental rise. Instead of having asymmetrical morphology and discontinuous reflections as observed in field 1, the sediment waves in field 2 show more symmetrical morphology and continuous reflections that can be traced from one wave to another, suggesting that vertical aggradation is more active and predominant than up-slope migration. Three sediment wave evolution stages, stage 1 through stage 3, are identified in both field 1 and field 2. During stage 1, the sediment waves are built upon a regional unconformity that separates the underlying mass-transport complexes from the overlying sediment waves. In both of these two fields, there is progressive development of the sediment waves and increase in wave dimensions from the oldest stage 1 to the youngest stage 3, even though up-slope migration is dominant in field 1 whereas vertical aggradation is predominant in field 2 throughout these three stages. The integrated data and the depositional model show that the upper slope of the study area is strongly dissected and eroded by down-slope gravity flows. The net result of strong erosion is that significant amounts of sediment are transported further basinward into the lower slope by gravity flows and/or turbidity currents. The interactions of these currents with bottom (contour) currents induced by the intrusion of the Northern Pacific Deep Water into the South China Sea and preexisting wavy topography in the lower slope result in the up-slope migrating sediment waves in field 1 and the contourites as observed from cores TS01 and TS02. Further basinward on the continental rise, turbidity currents are waned and diluted, whereas along-slope bottom (contour) currents are vigorous and most likely dominate over the diluted turbidity currents, resulting in the vertically aggraded sediment waves in field 2. The results from this study also provide the further evidence for the intrusion of the Northern Pacific Deep Water into the South China Sea and suggest that this intrusion has probably existed and been capable of affecting sedimentation in South China Sea at least since Quaternary.
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影响因子：
3.6
作者：
Qu, T;Mitsudera, H;Yamagata, T
通讯作者：
Yamagata, T
影响因子：
2.9
作者：
V. Ediger;A. Velegrakis;G. Evans
通讯作者：
V. Ediger;A. Velegrakis;G. Evans
影响因子：
2.9
作者：
J. Faugères;E. Gonthier;T. Mulder;N. Kenyon;P. Cirac;R. Griboulard;S. Berné;Raymond Lesuavé
通讯作者：
J. Faugères;E. Gonthier;T. Mulder;N. Kenyon;P. Cirac;R. Griboulard;S. Berné;Raymond Lesuavé
影响因子：
2.9
作者：
R. G. Arzola;R. Wynn;G. Lastras;D. Masson;P. Weaver
通讯作者：
R. G. Arzola;R. Wynn;G. Lastras;D. Masson;P. Weaver
DOI：
10.1016/0198-0149(88)90070-2
发表时间：
1988-06
期刊：
--
影响因子：
--
作者：
R. Flood;A. Shor
通讯作者：
R. Flood;A. Shor