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首页> 外文期刊>Marine and Petroleum Geology >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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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

机译：台湾西南部南中国海斜坡上的沉积物波：对北太平洋深水侵入南中国海的影响

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摘要

Using an integrated multi-beam bathymetry, high-resolution seismic profile, piston core, and AMS ~(14)C 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.
机译：利用综合的多波束测深，高分辨率地震剖面，活塞芯和AMS〜（14）C测年数据集，当前的研究确定了西南海域南海斜坡上的两个沉积波场，场1和场2。台湾。场1位于下坡，其内的沉积波总体上垂直于下坡重力流和峡谷轴的方向。几何形状，形态和内部地震反射构造表明，油田1中的沉积物波经历了明显的上坡偏移。相比之下，油田2在大陆上升区的位置更靠盆地。与在场1中观察到的不对称形貌和不连续反射不同，在场2中的沉积物波表现出更对称的形貌和可以从一个波追踪到另一个波的连续反射，这表明垂直凝结比上坡更为活跃和占优势。移民。在场1和场2中都确定了从阶段1到阶段3的三个沉积物波演化阶段。在阶段1中，沉积物波建立在区域不整合面之上，该区域不整合面将潜在的物质传输复合体与上覆的沉积物波分开。在这两个领域中，尽管最早的阶段1到最年轻的阶段3都出现了沉积波的逐步发展，并且波的大小有所增加，尽管在领域1中上升坡迁移占主导地位，而在领域2中垂直凝结则占主导地位。在这三个阶段。综合数据和沉积模型表明，研究区的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，大量泥沙由于重力流和/或浊流而进一步向盆地内输送到较低的斜坡。这些洋流与北太平洋深水侵入南中国海和下部斜坡先前存在的波状地形所引起的底部（轮廓）洋流相互作​​用，导致场1中的上坡沉积泥沙波和等高线迁移。从内核TS01和TS02观察到。在大陆上升的进一步盆地中，浊流减弱并被稀释，而沿斜坡底部（轮廓）流则很剧烈，并且很可能在稀释浊流中占主导地位，从而导致了场2中垂直沉积的泥沙波。这项研究还为北太平洋深水侵入南中国海提供了进一步的证据，并表明这种侵入至少在第四纪以来可能已经存在并且能够影响南海的沉积。

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