当前位置: X-MOL 学术Boreas › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A new map of glacigenic features and glacial landsystems in central mainland Nunavut, Canada
Boreas ( IF 2.4 ) Pub Date : 2020-11-06 , DOI: 10.1111/bor.12479
Isabelle McMartin 1 , Pierre‐Marc Godbout 1 , Janet E. Campbell 1 , Tommy Tremblay 2 , Pouran Behnia 1
Affiliation  

A new digital map of glacial geomorphic features and interpreted glacial landsystems was produced for an area covering ~415 000 km2 in the Keewatin Sector of the Laurentide Ice Sheet (LIS) in Nunavut. The map integrates information from previous surficial geology maps and >14 000 field stations, and is significantly improved by the detailed inventory of ~152 000 glacigenic features using high‐resolution ArcticDEM data and Landsat 8 imagery. From this, we identify and map coherent patterns of landform development (landsystems) between the Manitoba border and the Arctic coast, many of which are entirely new and others that are significantly modified or updated. In particular, we recognize six separate ice streams, including one probable remnant ice stream, and we delineate numerous palimpsest streamlined landscapes with associated ice‐flow trends and relative ages. A continuum of relict terrains with varying basal ice thermal conditions is mapped for the first time in the ice divide migration zone between Baker Lake and Wager Bay. In addition, deglacial cold‐based retreat terrains and preserved warm‐based landscapes unaffected by younger glacial events have been identified. These new georeferenced, multi‐scale data sets and interpreted glacial landsystems provide a comprehensive framework to strengthen reconstructions of the glacial history and dynamics of one of the largest ice domes of the LIS, identify distinct glacial sediment transport paths for applications to mineral exploration, and test numerical modelling of the LIS in support of climate change studies and long‐term evolution of modern ice sheets.

中文翻译:

加拿大努纳武特地区中部冰川成因特征和冰川土地系统的新地图

绘制了一个新的冰川地貌特征和解释性冰川土地系统的数字地图,覆盖了约415 000 km 2在努纳武特的Laurentide Ice Sheet(LIS)的Keewatin部门。该地图整合了以前的表面地质图和> 14 000个野外测站的信息,并通过使用高分辨率ArcticDEM数据和Landsat 8影像对约152 000个冰川成因的详细清单进行了显着改进。据此,我们确定并绘制了曼尼托巴边界与北极海岸之间地貌发展(土地​​系统)的连贯模式,其中许多是全新的,而其他则进行了重大修改或更新。特别是,我们识别出六种独立的冰流,其中包括一条可能的残余冰流,并且我们描绘了许多最淡淡的流线型景观,以及相关的冰流趋势和相对年龄。在贝克湖和瓦格湾之间的冰区迁移区内,首次绘制了具有不同基础冰热条件的连续遗迹地形图。此外,还确定了不受年轻冰川事件影响的冰河冷退缩地带和保留的保暖地貌。这些新的地理参考,多尺度数据集和经解释的冰川土地系统提供了一个全面的框架,以加强对LIS最大冰穹之一的冰川历史和动力学的重建,确定用于矿物勘探的独特冰川沉积物运输路径,以及对LIS进行数值模拟测试,以支持气候变化研究和现代冰盖的长期演变。已经确定了不受年轻冰川事件影响的冰冷退缩后退地形和保暖基础景观。这些新的地理参考,多尺度数据集和经解释的冰川土地系统提供了一个全面的框架,以加强对LIS最大冰穹之一的冰川历史和动力学的重建,确定用于矿物勘探的独特冰川沉积物运输路径,以及对LIS进行数值模拟测试,以支持气候变化研究和现代冰盖的长期演变。已经确定了不受年轻冰川事件影响的冰期退缩后退地形和保暖地貌。这些新的地理参考,多尺度数据集和经解释的冰川土地系统提供了一个全面的框架,以加强对LIS最大冰穹之一的冰川历史和动力学的重建,确定用于矿物勘探的独特冰川沉积物运输路径,以及对LIS进行数值模拟测试,以支持气候变化研究和现代冰盖的长期演变。
更新日期:2020-11-06
down
wechat
bug