Table 5.

Selected electron microprobe analyses for interstitial glasses found in lavas and tephra of the 2002–2003 Stromboli eruption

TypeRecent lavasScoriasPumices
SampleStr53Str53Str53Str53Str55Str55Str059Str059Str063Str063Str063St62St62St62St62St64St64
Analysis no.1234567891011121314151617
DateDecember 2002December 2002December 2002December 2002January 2003January 2003December 2002December 2002December 2002December 2002December 2002April 2003April 2003April 2003April 2003April 2003April 2003
SiO251.752.152.151.650.350.951.251.752.752.050.849.349.748.549.248.048.1
TiO21.641.591.441.801.321.781.641.901.541.861.681.071.060.961.020.981.14
Al2O315.115.415.215.318.215.214.615.415.615.815.317.817.817.617.716.9817.12
FeOT9.409.499.2910.668.2311.289.729.929.169.119.538.637.968.747.438.209.31
MnOn.d.n.d.n.d.0.120.10n.d.n.d.n.d.n.d.n.d.n.d.n.d.0.10n.d.n.d.n.d.n.d.
MgO3.653.563.622.932.453.224.443.653.703.554.085.395.085.986.035.835.98
CaO7.657.497.367.569.095.688.108.037.567.609.0513.312.112.513.612.1511.97
Na2O3.313.243.063.133.523.352.763.172.602.553.052.292.262.152.152.52.4
K2O4.524.294.244.463.395.134.774.254.164.174.321.572.531.911.382.12.5
P2O51.101.131.201.281.171.331.481.411.191.530.99n.d.0.930.570.880.780.68
Total98.198.397.598.897.797.898.899.498.298.298.899.399.598.999.397.499.2
Mg#0.410.400.410.330.350.340.450.400.420.410.430.530.530.550.590.560.53
CaO/Al2O30.510.490.480.490.500.370.550.520.480.480.590.750.680.710.770.720.70
K2O/Na2O1.371.321.391.420.961.531.731.341.601.641.420.691.120.890.640.831.02
  • T=Total iron as FeO; n.d.=not detected.