Figure 4
From: The first physical evidence of subglacial volcanism under the West Antarctic Ice Sheet
Bivariate plot of S versus TiO2/FeO to the assess phreatomagmatic origin of Tephra C. Glass fragments with higher S values are considered to have been erupted prior to degassing as in a phreatomagmatic eruption. Volcanic product best fit regression lines for melt inclusions, tephra, and lava from Icelandic basalts are from Oladottir, et al.38. Error bar for each S measurement shown in lower right.
