Compaction of Hyaloclastite from the Active Geothermal System at Krafla Volcano, Iceland

Figure 5

Phase abundance histogram for hyaloclastite from different depths within the hydrothermal reservoir at Krafla volcano, NE Iceland, from SEM-EDS QEMSCAN® maps with 20 µm step size (Figure 3). The most abundant phase is glass for all samples, i.e., surface, 70 m, 76 m, 556 m, and 732 m depth. Other represents other identified phases present in trace amounts; unclassified represents those uncategorised, which may be due to very fine grain sizes (whereby each pixel represents multiple phases).