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