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Formation and widening of a North Sea tunnel valley - The impact of slope processes on valley morphology
Geomorphology ( IF 3.9 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.geomorph.2020.107347
Lasse Tésik Prins , Katrine Juul Andresen , Ole Rønø Clausen , Jan A. Piotrowski

Abstract Over the past two decades, seismic data from the hydrocarbon industry have become a popular tool for investigating shallow Quaternary formations in the North Sea Basin, revealing multiple buried tunnel valleys and other features of glacial origin. In this study, we incorporate 3D seismic analysis with 2D high-resolution seismic data to describe a tunnel valley system in the southern part of the Danish North Sea Basin. We document pervasive slumping as the main driver for valley widening in the southern part of the system. The slumping and the lateral distribution of slump scars were seemingly controlled by valley steepness and the shape of the valley profile, which is partly controlled by the infill rate. The system evolved through multiple erosional and depositional phases in the subglacial environment, with continued deposition after deglaciation. The study provides further evidence of large-scale channelized subglacial drainage under past ice sheets and documents a strong impact of valley slope processes in the shaping of the morphology of the upper slopes and shoulders of tunnel valleys.

中文翻译:

北海隧道河谷的形成与拓宽——斜坡过程对河谷形态的影响

摘要 在过去的 20 年中,油气工业的地震数据已成为研究北海盆地浅第四纪地层、揭示多个埋藏隧道山谷和其他冰川成因特征的流行工具。在这项研究中,我们将 3D 地震分析与 2D 高分辨率地震数据相结合,以描述丹麦北海盆地南部的隧道山谷系统。我们记录了普遍的坍塌是系统南部山谷扩大的主要驱动因素。塌陷疤痕的塌陷和横向分布似乎受谷陡度和谷剖面形状控制,部分受填充率控制。该系统在冰下环境中经历了多个侵蚀和沉积阶段,冰川消融后继续沉积。该研究提供了过去冰盖下大规模渠道化冰下排水的进一步证据,并记录了山谷坡度过程对隧道山谷上坡和肩部形态形成的强烈影响。
更新日期:2020-11-01
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