Figure 2
From: Buried remnants of the Laurentide Ice Sheet and connections to its surface elevation
δD-δ18O and geochemical composition of LIS remnants. A. δD-δ18O scatter plot of ice from Barnes Ice Cap (from ref.18), the four types of buried ice at the Peel Plateau site (1: ice with mm-size spherical gas inclusions; 2: sub-vertically banded clear ice and fine sediments; 3: bubble-poor blue ice; and 4: white ice rich in spherical gas inclusions, very similar in appearance to the late Pleistocene white ice band on Barnes Ice Cap), and the buried ice on Victoria and Bylot islands. The buried ices are distributed along the Barnes Ice Cap δD-δ18O values, suggesting they consist of buried glacier ice. B. Range of cation concentrations (mg L−1) for buried ice on the Peel Plateau and Bylot Island. Also shown is cation content of C93 glacier on Bylot Island. The buried ices on the Peel Plateau and Bylot Island have cation content ~1 to 3 orders of magnitude lower than most intrasedimental ice types in permafrost61,62.
