GERM Reservoir Database
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GERM Database Search Results        
Reservoir Z Element Value Median SD Low High N Unit Info Reference Source(s)
Dacites 13 Al 15.91         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 6 C 6.924             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin.  Carbon in this particular case is given as CO2. Oppenheimer 2004 Symonds et al. 1994
Dacites 6 C 0.06         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 20 Ca 4.32         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 27 Co 0.06             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin. Oppenheimer 2004 Symonds et al. 1994
Dacites 26 Fe 4.487         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17.Total Fe calculated from Fe2O3 value of 2.43 and FeO value of 2.30. Le Maitre 1976
Dacites 1 H 1.19         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17.Combination of H2O+ and H2O- values. Le Maitre 1976
Dacites 1 H 0.3553             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin.  Hydrogen in this particular case is given as H2S gas. Oppenheimer 2004 Symonds et al. 1994
Dacites 1 H 0.8542             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin. Hydrogen in this particular value is given as H2 (Pure Hydrogen Gas Emissions). Oppenheimer 2004 Symonds et al. 1994
Dacites 1 H 91.58             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin. Hydrogen in this case is represented by H2O. Oppenheimer 2004 Symonds et al. 1994
Dacites 19 K 2.17         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 12 Mg 1.78         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 25 Mn 0.09         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 11 Na 3.79         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 15 P 0.15         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 16 S 0.2089             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin.  Sulfur in this particular case is given as SO2 gas. Oppenheimer 2004 Symonds et al. 1994
Dacites 16 S 0.0039             Compositional analyses of Dacite obtained by direct sampling of hot gas vents at Mt. St. Helens 1980. Based on the geology of this region the volatile levels are consistent with those of any subducted continental margin.  Sulfur in this particular case is given as S2 gas. Oppenheimer 2004 Symonds et al. 1994
Dacites 14 Si 65.01         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
Dacites 22 Ti 0.58         578 wt%ox Average major oxide concentration values for Dacite consolidated from 80 references and 578 analyses. Differentiation index equal to 67.62, Crystallization index equal to 23.17. Le Maitre 1976
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