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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Time-transgressive tunnel valley formation indicated by infill sediment structure, North Sea - the role of glaciohydraulic supercooling
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Time-transgressive tunnel valley formation indicated by infill sediment structure, North Sea - the role of glaciohydraulic supercooling

机译：北海充填沉积物结构指示时变海底隧道谷形成-冰川液压过冷的作用

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摘要

Structure and lithology of the infill sediments from 16 subglacial buried tunnel valleys of Pleistocene age in the North Sea were analyzed using 3D seismic data and geophysical log data from five hydrocarbon exploration wells. The infill sediments are characterized by three seismic facies: Facies I, the volumetrically most important and structurally most distinct, is composed of clinoform reflections downlapping axially up-valley (up-ice), Facies II is composed of near-horizontal, continuous and well layered reflections onlapping the clinoform reflections and the valley walls and Facies III is composed of clinoform reflections downlapping axially down-valley (down-ice). A model of formation of this sediment architecture is proposed, in which valley incision and infill are causally linked. It is proposed that Facies I is related to glaciohydraulic supercooling of subglacial meltwater in the distal parts of tunnel valleys. The valleys formed time-transgressively during ice retreat, whereby sediment eroded further up-ice was re-deposited along adverse subglacial slopes of the valleys close to the ice margin. The formation of Facies II and III is related to the deposition in proglacial basins during final deglaciation. Copyright (C) 2008 John Wiley & Sons, Ltd.
机译：利用来自5个油气勘探井的3D地震数据和地球物理测井资料，分析了北海16个更新世时代的冰川下埋藏隧道谷的填充物沉积物的结构和岩性。填充物的沉积物具有三个地震相的特征：体积最大，结构最独特的相I由轴向上谷（up-ice）向下重叠的斜形反射组成，相II由近水平，连续和井形组成层状反射叠加在斜形反射和谷壁上，而Facies III则由斜形反射沿轴向向下的谷（下冰）向下重叠组成。提出了这种沉积物构造的模型，其中山谷切口和填充物因果联系。有人认为，相I与隧道谷远端的冰川融化的冰川水力过冷有关。山谷在退冰期间随时间变化而形成，从而使沉积物进一步侵蚀了冰层，沿着靠近冰缘的山谷不利的冰下斜坡重新沉积。二期和三期相的形成与冰消期最后在冰河盆地中的沉积有关。版权所有（C）2008 John Wiley＆Sons，Ltd.

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