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Table 1 Chemical composition (wt%) of the different basaltsa

From: Characterization of the bacterial communities on recent Icelandic volcanic deposits of different ages

  32-year 35-year 39-year
SiO2 49.41 49.15 49.42
Al2O3 13.18 13.24 13.38
Fe2O3 15.49 15.06 14.19
MnO 0.23 0.23 0.22
MgO 5.64 5.76 5.88
CaO 9.96 9.50 9.97
Na2O 2.33 2.30 2.34
K2O 0.36 0.32 0.33
TiO2 2.00 1.99 1.84
P2O5 0.23 0.22 0.22
FeO 12.30 9.00 11.10
LOIb 0.07 2.19 1.47
Total 98.90 99.96 99.25
  1. aUncertainty of the measurement is 0.01%; bLOI: loss on ignition