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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Complex kame belt morphology, stratigraphy and architecture
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Complex kame belt morphology, stratigraphy and architecture

机译：复杂kame皮带形态，地层和建筑

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The development of glacier karst at the margins of melting ice sheets produces complex glaciofluvial sediment-landform assemblages that provide information on ice sheet downwasting processes. We present the first combined geomorphological, sedimentological and geophysical investigation of the Brampton Kame Belt, an important glaciofluvial depositional zone at the centre of the last British-Irish Ice Sheet. Ground-penetrating radar (GPR) data allow the broad scale internal architecture of ridges (eskers) and flat-topped hills (ice-walled lake plains) to be determined at four sites. In combination with sediment exposures, these provide information on lateral and vertical variations in accretion styles, depositional boundaries, and grain size changes. Building on existing work on the subject, we propose a refined model for the formation of ice-walled lake plains resulting from the evolution and collapse of major drainage axes into lakes as stable glacier karst develops during deglaciation. The internal structure of esker ridges demonstrates variations in sedimentation that can be linked to differences in ridge morphologies across the kame belt. This includes low energy flow conditions and multiple accretion phases identified within large S-N oriented esker ridges; and fluctuating water pressures, hyperconcentrated flows, and significant deformation within a fragmented SW-NE oriented esker ridge. In combination with updated geomorphological mapping, this work allows us to identify two main styles of drainage within the kame belt: (1) major drainage axes aligned broadly S-N that extend through the entire kame belt and collapsed into a chain of ice-walled lakes; and (2) a series of smaller, fragmented SW-NE aligned esker ridges that represent ice-marginal drainage as the ice sheet receded south-eastwards up the Vale of Eden. Our study demonstrates the importance of integrated geomorphological, sedimentological and geophysical investigations in order to understand complex
机译：在熔化冰盖边缘的冰川岩石中的开发产生复杂的甘草渣沉积物 - 地形组合，提供有关冰盖挖空床的信息。我们展示了Brampton Kame带的第一种结合的地貌，沉积和地球物理调查，这是最后一个英国爱尔兰冰盖中心的重要甘草杂交区。地面穿透雷达（GPR）数据允许在四个地点确定脊（ESKERS）和横向山丘（冰川平原）的宽尺度内部架构。结合沉积物暴露，这些提供有关横向和垂直变化的信息，沉积曲线，沉积边界和晶粒尺寸变化。建立对该主题的现有工作，我们提出了一种精致的模型，用于形成由主要排水轴的进化和坍塌成为湖泊的冰川湖平原，因为稳定的冰川喀斯特在脱盐期间发展。 ESKER脊的内部结构证明了沉淀的变化，可以与kame皮带上的脊形态的差异相关。这包括低能量流动条件和在大型S-N定向的ESKER脊内识别的多个增孔相;和水压波动，过度浓度的流动，以及在碎片的SW-NE导向ESKER脊内的显着变形。结合更新的地貌映射，这项工作允许我们识别kame皮带内的两个主要排水度：（1）主要排水轴宽的S-N延伸穿过整个kame腰带并坍塌成一连串的冰墙湖链; （2）一系列较小的碎片化的SW-NE对齐的ESKER脊，代表冰边缘排水，因为冰盖向东升起了伊甸谷的谷谷。我们的研究表明，综合地貌，沉积和地球物理调查的重要性，以了解复杂

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