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首页> 外文期刊>Geoscience journal >Seismic stratigraphic reconstruction of late Pleistocene lowstand wedges on the shelf margin and trough region of the Korea Strait: a review
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Seismic stratigraphic reconstruction of late Pleistocene lowstand wedges on the shelf margin and trough region of the Korea Strait: a review

机译：韩国海峡架子边缘铺砌楔形楔形的地震地层重建及韩国海峡地区：综述

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This paper is a review of stratigraphic architectures and evolution history of late Pleistocene lowstand deposits on the outer shelf of Korea Strait. Located between the southeastern tip of the Korean Peninsula and the Tsushima Island, the Korea Strait is a seaway connecting the East Sea with the East China Sea. Detailed analysis of high-resolution seismic profiles and sediment data give a good evidence for the existence of three superimposed wedge-shaped sedimentary units that thicken seaward. The individual sedimentary wedges are characterized by seaward dipping and complex sigmoid-oblique prograding reflection configurations with some chaotic or hummocky reflectors. On the basis of distribution and external geometry, these sedimentary wedges are interpreted as a "shelf-margin or shelf-edge delta", mainly related to falling and lowstand sea level. Occurrence of this delta type is a common constitute of the Quaternary shelf in the Korea Strait. Although the entire units have not been fully dated, it is believed that these wedges were deposited during late Pleistocene sea-level lowstands. Repeated falls and lowstands of sea level (isotopic stages 8, 6 and 2/4) resulted in the formation of lowstand prograding wedges along the present shelf margin and trough region, having been separated from the inner shelf deposits. During subsequent episodes of sea-level rise (isotopic stages 8/7, 6/5, and 2/1), the upper part of sedimentary wedges was eroded, and thin covered by thin transgressive sands. Consequently, the late Pleistocene sequences on the shelf margin and trough region in this area mainly consist of a succession of stacked lowstand prograding wedges formed during the regression and lowstand of sea level.
机译：本文是对韩国外壳外壳上的地层架构和晚熟沉积物的地层架构和演化史。韩国海峡位于朝鲜半岛和Tsushima岛之间的东南部，是与东海连接东海的海路。高分辨率地震曲线和沉积物数据的详细分析给出了三个叠加的楔形沉积单元，其增厚了两种叠加的楔形沉积单元。各个沉积楔形的特点是海拔浸渍和复杂的S形倾斜促进反射配置，其中有一些混沌或拔拔器反射器。在分布和外部几何形状的基础上，这些沉积楔形物被解释为“货架 - 边缘或搁板边缘”，主要与下降和低地海平面有关。这种三角洲类型的发生是韩国海峡中季架的共同构成。虽然整个单位尚未完全过时，但据信这些楔子在晚熟海水位沉积期间沉积。反复落下和海拔的低位（同位素阶段8,6和2/4）导致沿着本架子裕度和槽区域形成垂直升降楔，已经与内搁板沉积物分离。在随后的海平面升高发作期间（同位素阶段8/7,6 / 5和2/1），沉积楔的上部被侵蚀，并薄薄地覆盖薄的近近近近海底。因此，该区域的架子边缘和槽区域的晚期更新序列主要包括在海拔回归和划分期间形成的堆叠的倾角促成楔。

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