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Isolating the role of shore-parallel sediment transport in continental shelf build-up
Continental Shelf Research ( IF 2.3 ) Pub Date : 2021-06-11 , DOI: 10.1016/j.csr.2021.104480
Uri Schattner

While the role of shore-parallel transport is extensively documented, its contribution to source-to-sink and provenance studies is often overshadowed by tectonic variations, sediment influx, and sea-level change. To isolate the sedimentary contribution of shore-parallel transport, this study examines the central Levant continental margin (easternmost Mediterranean), where the other three factors are well constrained. New high-resolution multibeam and seismic reflection data collected in a dedicated cruise aboard the RV Bat Galim are used for analyzing current-indicating morphologies formed since the Last Glacial Maximum (LGM). Results show six different current indicators, which attest to the ongoing shore-parallel Levant Jet System (LJS) flow. Throughout the post-LGM transgression and coastal retreat, the LJS shifted landward to flow over the submerged shelf and upper slope. This shift, along with periodic/seasonal alterations in the flow intensity, regulated the sediment transport, distribution and erosion, along and across the margin, during the lowstand, transgression, and highstand conditions. This case study emphasizes the central role of shore-parallel currents in regulating the sedimentary budget. It provides a reference case for continental margins where the shore-parallel role is obscured by more dominant tectonic-eustatic-sedimentation factors.



中文翻译:

隔离海岸平行沉积物输送在大陆架形成中的作用

虽然海岸平行运输的作用被广泛记录,但它对源汇和来源研究的贡献往往被构造变化、沉积物流入和海平面变化所掩盖。为了区分海岸平行输运的沉积作用,本研究考察了中部黎凡特大陆边缘(地中海最东端),在那里其他三个因素受到很好的约束。在 RV Bat Galim 上的专用巡航中收集的新的高分辨率多波束和地震反射数据用于分析自末次盛冰期 (LGM) 以来形成的电流指示形态。结果显示了六个不同的电流指标,证明了正在进行的与岸边平行的黎凡特喷射系统 (LJS) 流动。在整个后 LGM 海侵和沿海撤退期间,LJS 向陆地移动,流过淹没的陆架和上坡。在低水位、海侵和高水位条件下,这种转变以及流量强度的周期性/季节性变化调节了沿和跨边缘的沉积物输送、分布和侵蚀。本案例研究强调了平行岸流在调节沉积收支方面的核心作用。它为大陆边缘提供了一个参考案例,其中海岸平行的作用被更占主导地位的构造-浮沉-沉积因素所掩盖。本案例研究强调了平行岸流在调节沉积收支方面的核心作用。它为大陆边缘提供了一个参考案例,其中海岸平行的作用被更占主导地位的构造-浮沉-沉积因素所掩盖。本案例研究强调了平行岸流在调节沉积收支方面的核心作用。它为大陆边缘提供了一个参考案例,其中海岸平行的作用被更占主导地位的构造-浮沉-沉积因素所掩盖。

更新日期:2021-06-14
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