Table 4.

Bulk composition of the lavas, scorias and pumices recently erupted at Stromboli volcano

SampleSt55St61St68St69St59St67St70St71St62St64
TypeLavaaLavaaLavaaLavaaScoriabScoriacScoriabScoriabPumicecPumicec
Analysis no.123467891112
Date28/12/0219/02/0317/03/0326/06/0328/12/0212/11/0316/09/0518/04/0605/04/0305/04/03
SiO249.749.649.449.649.949.849.649.648.649.3
TiO20.910.930.860.920.880.890.850.870.910.88
Al2O317.117.117.017.316.617.016.417.117.217.3
Fe2O3T8.868.718.678.768.948.868.698.708.708.93
MnO0.160.160.150.160.160.160.150.160.160.16
MgO6.276.046.166.136.746.366.786.156.136.49
CaO11.311.211.111.311.711.411.411.311.611.7
Na2O2.462.492.692.462.712.782.652.742.372.66
K2O2.122.162.112.102.062.032.212.081.911.82
P2O50.530.550.480.540.480.500.500.490.530.49
LOI0.100.120.750.110.140.09
Total99.599.199.399.3100.299.799.499.298.399.9
Mg#0.5580.5530.5590.5550.5730.5610.5820.5570.5570.564
CaO/Al2O30.6610.6560.6530.6540.7070.6690.6940.6580.6710.674
K2O/Na2O0.8600.8700.7850.8550.7620.7300.8330.7600.8050.684
  • T=Total iron as Fe2O3; LOI, loss on ignition.

  • asampled along the Sciara del Fuoco; bsampled near and below the crater area; csampled in the summit area.