Late Wisconsin (Late Foxe) Glacial Extent in Pangnirtung Fjord-Cumberland Sound Area, Baffin Island, Canada

加拿大巴芬岛庞纳唐峡湾-坎伯兰海峡地区威斯康星晚期（福克斯晚期）冰川范围

• 批准号: 8922199
• 负责人: P.Thompson Davis
• 金额: $ 12.82万
• 依托单位: Bentley University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922199&HistoricalAwards=false
• 关键词: Late; Wisconsin; Foxe; Glacial; Extent

Late Wisconsin ice extent on Baffin Island has important global implications for ice sheet reconstruction, sea level change, and climate modeling of the late Pleistocene. The purpose of this project is to test two hypotheses that ice either: 1) flowed down Pangnirtung Fjord from a grounded position on the floor of Cumberland Sound, or 2) flowed up the Pangnirtung Fjord from a grounded position on the floor of the Cumberland Sound. In both scenarios, ice extended far beyond previously mapped late Wisconsin margins. Field work will focus on detailed mapping and accurate surveying of glacial abrasion limits and depositional features. In particular, the Duval moraines will be mapped in detail to determine the direction and age of the last ice flow in the area. Analytical work will involve analysis of soils, including hornblende etching, to determine relative ages. Sediment cores from strategically located lakes will be retrieved to provide minimum-limiting radiocarbon ages for glacial erosional limits and depositional features. Pollen analysis of lacustrine sediments will be used to support the above dating techniques. Finally, ice profiles will be reconstructed in an attempt to evaluate ice volume and dynamics in the Pangnirtung area during the late Wisconsin.

巴芬岛晚威斯康辛冰川覆盖范围对全球冰盖重建、海平面变化和晚更新世气候模拟具有重要意义。这个项目的目的是测试两种假设：1)冰从坎伯兰峡湾底部的接地位置流下Pangnirtung峡湾，或者2)从坎伯兰峡湾底部的接地位置流下Pangnirtung峡湾。在这两种情况下，冰的范围都远远超出了之前绘制的威斯康星州晚期边缘。实地工作将集中于详细测绘和精确测量冰川磨损界限和沉积特征。特别是，杜瓦尔冰碛将被详细绘制，以确定该地区最后一次冰流的方向和年龄。分析工作将包括分析土壤，包括角闪石蚀刻，以确定相对年龄。从战略位置的湖泊中提取沉积物岩心，为冰川侵蚀极限和沉积特征提供最低限制放射性碳年龄。湖泊沉积物的花粉分析将用于支持上述测年技术。最后，将重建冰剖面，以评估威斯康星州晚期Pangnirtung地区的冰体积和动态。