Figure 2: Geochemical data for Mt. Cameroon lavas and minerals.
From: Locating the depth of magma supply for volcanic eruptions, insights from Mt. Cameroon
(a) Total alkali versus silica diagram after Le Bas et al.49 classifies the 1999 and 2000 Mt. Cameroon lavas as basanites. Previously published data8 are plotted as grey symbols. (b) Clinopyroxenes from the 1999 and 2000 eruptions (n = 527) classify as diopside, following the scheme of Morimoto et al.50. (c) Plagioclase compositions from the 1999 and 2000 eruptions (n = 364) classify dominantly as bytownite and labdradorite, with only minor andesine present. (d) Plot of Nb versus K2O for the 1982, 1999 and 2000 lavas. Mixing trends are observed between the 1959 and the 1982 lavas (Fitton et al.)7 and between the 1982 and the 1999/2000 lavas (this study). Previously published data on the 1999 and 2000 eruption8 are plotted as grey symbols.
