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Tectonostratigraphic framework in the eastern Korean continental margin, East Sea: Implication for evolution of the Hupo Basin
Basin Research ( IF 3.2 ) Pub Date : 2021-11-27 , DOI: 10.1111/bre.12641 Yongjoon Park 1, 2 , Nyeonkeon Kang 2 , Boyeon Yi 2 , Gwangsoo Lee 2 , Donggeun Yoo 1, 2
Basin Research ( IF 3.2 ) Pub Date : 2021-11-27 , DOI: 10.1111/bre.12641 Yongjoon Park 1, 2 , Nyeonkeon Kang 2 , Boyeon Yi 2 , Gwangsoo Lee 2 , Donggeun Yoo 1, 2
Affiliation
Integrating seismic interpretation facilitates the discernment of tectonostratigraphic evolution in the eastern Korean continental margin, East Sea. The sedimentary succession of this margin is divided into three major seismic units based on distinct unconformities. These unconformities and their associated seismic characteristics indicate that the eastern Korean continental margin has experienced four evolutionary stages through extensional and subsequent two-phase tectonic inversions. Early Miocene back-arc opening of the East Sea triggered the extension of NNW–SSE and N–S trending rifts, resulting in non-marine to deep-marine deposition of typical rift-related linked sedimentological systems in the eastern Korean continental margin. In the early Late Miocene, changes in plate motion and the subduction mode of the Japanese island (NW–SE compression) caused the positive inversion of extensional fault-bounded half-grabens in the eastern Korean continental margin, and the Hupo Basin was likely created by the regional flexural response. During this depositional period, hemipelagic sedimentation accompanied by episodic gravity-controlled slope failures was predominant in the deep-water environment. The subsidence of the Hupo Basin was enhanced by crustal shortening (E–W compression) that was induced by subduction initiation at the western margin of the Ulleung Basin during the late Early Pliocene (ca. 3.8 Ma). At that time, sedimentary environment gradually became shallower with time and coarse-grained terrigenous input into the Hupo Basin began so that shallow- to deep-marine sedimentation occurred. In the Quaternary period, the uplift of the Hupo Bank and coeval subsidence of the Hupo Basin were maintained by continued compressive neotectonics. The shallow- to deep-marine deposition continued, but greater quantities of coarse-grained terrestrial sediment were transported into the Hupo Basin due to combined effects on tectonics and eustasy. Based on the tectonostratigraphic reconstruction developed in this study, we propose that the Hupo Basin is likely a Late Miocene–Quaternary compression-related basin induced by crustal or thrust loading.
中文翻译:
东海东朝鲜大陆边缘构造地层格架:对虎坡盆地演化的启示
综合地震解释有助于辨别朝鲜东部大陆边缘东海的构造地层演化。该边缘的沉积层序根据明显的不整合面划分为三个主要的地震单元。这些不整合面及其相关的地震特征表明,朝鲜东部大陆边缘经历了伸展和随后的两期构造反转的四个演化阶段。早中新世东海弧后张开引发了 NNW-SSE 和 N-S 向裂谷的扩展,导致朝鲜东部大陆边缘典型裂谷相关的关联沉积系统从非海向深海沉积。在晚中新世早期,板块运动变化和日本岛俯冲模式(NW-SE压缩)导致朝鲜东部大陆边缘伸展断层边界半地堑的正反转,虎坡盆地可能是区域弯曲反应造成的。在这一沉积期,深水环境中以半远洋沉积为主,伴有偶发的重力控制斜坡破坏。上新世晚期(约 3.8 Ma)郁陵盆地西缘开始俯冲引发的地壳缩短(东西向压缩)增强了虎坡盆地的沉降。此时,随着时间的推移,沉积环境逐渐变浅,开始进入虎坡盆地的陆源粗粒输入,发生浅海至深海沉积。第四纪,持续的挤压新构造作用维持了虎坡岸的隆升和虎坡盆地的同期沉降。浅海至深海沉积继续存在,但受构造和海流共同作用,大量陆相粗粒沉积物被运入虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。但由于构造和海啸的共同作用,更多的粗粒陆相沉积物被输送到虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。但由于构造和海啸的共同作用,更多的粗粒陆相沉积物被输送到虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。
更新日期:2021-11-27
中文翻译:
东海东朝鲜大陆边缘构造地层格架:对虎坡盆地演化的启示
综合地震解释有助于辨别朝鲜东部大陆边缘东海的构造地层演化。该边缘的沉积层序根据明显的不整合面划分为三个主要的地震单元。这些不整合面及其相关的地震特征表明,朝鲜东部大陆边缘经历了伸展和随后的两期构造反转的四个演化阶段。早中新世东海弧后张开引发了 NNW-SSE 和 N-S 向裂谷的扩展,导致朝鲜东部大陆边缘典型裂谷相关的关联沉积系统从非海向深海沉积。在晚中新世早期,板块运动变化和日本岛俯冲模式(NW-SE压缩)导致朝鲜东部大陆边缘伸展断层边界半地堑的正反转,虎坡盆地可能是区域弯曲反应造成的。在这一沉积期,深水环境中以半远洋沉积为主,伴有偶发的重力控制斜坡破坏。上新世晚期(约 3.8 Ma)郁陵盆地西缘开始俯冲引发的地壳缩短(东西向压缩)增强了虎坡盆地的沉降。此时,随着时间的推移,沉积环境逐渐变浅,开始进入虎坡盆地的陆源粗粒输入,发生浅海至深海沉积。第四纪,持续的挤压新构造作用维持了虎坡岸的隆升和虎坡盆地的同期沉降。浅海至深海沉积继续存在,但受构造和海流共同作用,大量陆相粗粒沉积物被运入虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。但由于构造和海啸的共同作用,更多的粗粒陆相沉积物被输送到虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。但由于构造和海啸的共同作用,更多的粗粒陆相沉积物被输送到虎坡盆地。基于本研究开发的构造地层重建,我们提出虎坡盆地可能是由地壳或逆冲载荷诱发的晚中新世-第四纪压缩相关盆地。