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. 2021 May 19:1–13. doi: 10.1017/dmp.2021.154

Table 3.

Average weight percentages of each analyzed element in wt %, of all ash samples of the studied active volcanoes (Mn<1%, Ti and P<1.5%)

Si Al Ca Fe Na Mg K S
Pichincha 47.16 17.71 8.74 9.35 5.12 2.44 5.16 1.58
Cotopaxi 41.56 20.30 13.43 9.28 5.35 1.78 2.76 3.25
Tungurahua 45.09 17.20 10.92 10.65 4.91 2.37 4.35 1.45
Reventador 44.30 16.78 10.95 10.25 4.83 1.98 5.46 2.89
Sangay 41.06 16.67 14.20 8.64 6.03 2.77 3.90 2.58