ABSTRACT

Northern British Columbia was repeatedly covered by the Cordilleran Ice Sheet (CIS) during the glacial periods. However, its mountainous terrain and remote location have thus far impeded our understanding of the central sector of the ice sheet. The improved resolution of remotely sensed data provides new opportunities to unravel the glacial history of this inaccessible location. Here, we present a comprehensive map of glacial landforms for the central sector of the CIS (55° to 60° N). Seven landform categories were mapped: ice flow parallel lineations, moraines (CIS outlet glacier moraines, Late Glacial moraines and moraines of unknown origin), meltwater channels (lateral and submarginal, subglacial, proglacial, and meltwater channels of unknown origin), kame terraces, eskers (single ridges and esker complexes), perched deltas and subglacial ribs. Collectively, these landforms provide a record of the extent, thickness and behaviour of the CIS, the direction of its movement and pattern of ice retreat.

摘要

在冰川时期，不列颠哥伦比亚省北部反复被科迪勒拉冰盖 (CIS) 覆盖。然而，迄今为止，其多山的地形和偏远的位置阻碍了我们对冰盖中央部分的了解。遥感数据分辨率的提高为解开这个人迹罕至的地方的冰川历史提供了新的机会。在这里，我们展示了独联体中部地区（北纬 55° 至 60°）的冰川地貌综合地图。绘制了七个地貌类别：冰流平行线、冰碛（独联体出口冰川冰碛、晚冰期冰碛和来源不明的冰碛）、融水通道（横向和边缘、冰下、前冰河和未知来源的融水通道）、kame 阶地、 eskers（单脊和 esker 复合体），栖息的三角洲和冰下肋。