High‐resolution seafloor mapping provides insights into the dynamics of past ice sheets/ice shelves on high‐latitude continental margins. Geological/geophysical studies in the Arctic Ocean suggest widespread Pleistocene ice grounding on the Chukchi–East Siberian continental margin. However, flow directions, timing, and behavior of these ice masses are not yet clear due to insufficient data. We present a combined seismostratigraphic and morphobathymetric analysis of the Chukchi Rise off the northwestern Chukchi margin using the densely acquired subbottom profiler (SBP) and multibeam echosounder (MBES) data. Comparison with deeper airgun seismic records shows that the SBP data cover most of the glaciogenic stratigraphy possibly spanning ca. 0.5–1 Ma. Based on the stratigraphic distribution and geometry of acoustically transparent glaciogenic diamictons, the lateral and vertical extent of southern‐sourced grounded ice became smaller over time. The older deposits are abundant as debris lobes on the slope contributing to a large trough mouth fan, whereas younger grounding‐zone wedges are found at shallower depths. MBES data show two sets of mega‐scale lineations indicating at least two fast ice‐streaming events of different ages. Contour‐parallel recessional morainic ridges mark a stepwise retreat of the grounded ice margin, likely controlled by rising sea levels during deglaciation(s). The different inferred advance and retreat directions of the southern‐sourced ice reflect complex geomorphic settings. The overall picture shows that the Chukchi Rise was an area where different ice streams had complex interactions. In addition to glaciogenic deposits, we identify a number of related or preceding seabed features including mounds, gullies/channels, and sediment waves.

中文翻译：

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北冰洋楚科奇边缘冰河历史的地层和地貌证据

高分辨率的海底地图可以洞察高纬度大陆边缘过去的冰盖/冰架的动力学。北冰洋的地质/地球物理研究表明，楚科奇-东西伯利亚大陆边缘有广泛的更新世冰面。但是，由于数据不足，这些冰块的流向，时间和行为尚不清楚。我们使用密集采集的下层剖面仪（SBP）和多波束回声测深仪（MBES）数据，对西北楚科奇边缘的楚科奇海峡进行了地震地层学和形态计量学分析。与更深层次的气枪地震记录的比较表明，SBP数据涵盖了可能跨越约20世纪的大部分成冰地层。0.5-1毫安。根据透声的成冰双生层的地层分布和几何形状，随着时间的流逝，南方来源的地面冰的横向和垂直范围会变小。较旧的沉积物很丰富，因为斜坡上有碎屑裂片，形成了一个大的谷形扇形扇，而较年轻的接地带楔形物则出现在较浅的深度。MBES数据显示了两组大尺度线，表明至少两个不同年龄的快速冰流事件。等高线平行的凹状沟脊标志着陆上冰缘的逐步退缩，这很可能是由在冰消融过程中海平面上升所控制的。南源冰的不同推断前进和后退方向反映了复杂的地貌环境。总体情况显示，楚科奇河上升带是一个不同的冰流相互作用复杂的地区。除了产生冰川的沉积物，我们还确定了许多相关的或先前的海床特征，包括土丘，沟渠/河道和沉积物波。