Fig. 10From: Geochemical/hydrochemical evaluation of the geothermal potential of the Lamongan volcanic field (Eastern Java, Indonesia)Total alkali vs. silica diagram of Le Bas et al. (1986). This diagram classifies our rock samples as basalts. The red squares refer to the samples of this study. The Lamongan basalts plot along the line, which divide alkaline and subalkaline domain. Note the small SiO2 range of our samples, indicating low fractionation of the primitive magmaBack to article page