Investigation of pingos in Kuganguaq delta on Disko Island

The growth and collapse history of two pingos located approximately 18 m a.s.l, and 35 m a.s.l. in Kuganguag, Disko lsland, west-central Greenland were examined. The pingos of this area were formed on Tertiary basalt rocks. One of the pingos is located in the middle of an alluvial fan, the other is on a river bed. Both have already collapsed. The pingo on the river bed had already collapsed at least 3545±60 year BP (14C dating from base of the pond sediments in the pingo crater). Both pingos formed after the sea's retreat as permafrost developed in the newly exposed delta bottom.

本数据集考察了位于西格陵兰岛中部库甘加地区，海拔约18米和35米的两座冰丘的生长与坍塌历史。该地区的冰丘系形成于第三纪玄武岩之上。其中一座冰丘位于冲积扇中央，另一座位于河床之上。这两座冰丘均已坍塌。位于河床上的冰丘至少在3545±60年前已坍塌（通过冰丘坑底部池塘沉积物的14C年代测定）。这两座冰丘均形成于海退之后，新暴露的三角洲底部形成了永冻土。