Chemical analyses of typical lava flows from
Ascension Island, St. Helena, and Tristan da Cunha

  Ascension St. Helena Tristan
  AI-107 SH-1 128 466
SiO2 48.55 46.88 47.08
TiO2   3.00   3.62   3.08
Al2O3 15.28 15.90 16.73
Fe2O3 13.48 14.15 11.16
MnO   0.16   0.19   0.10
MgO   5.33   4.48   5.80
CaO   9.46   8.88   9.06
Na2O   3.34   3.61   3.59
K2O   0.94   1.52   2.74
P2O5   0.46   0.77   0.66
LOI   0.18   0.37   0.44
Ni 39      10      59     
Cr 28      5    71     
Co 60      37      39     
Sc 34      18      24     
V 304        184        246       
Zn 93      122        105       
Rb 18      29      69     
Sr 436        715        974       
Ba 201        372        779       
Th 2.3 5.1 8.3
Zr 188        325        299       
Hf 4.9 6.4 6.9
Nb 33      70      74     
Ta 2.3 4.3 5.1
La 23.3   45.8   57.9  
Ce 53.4   98.4   126       
Nd 31.4   45.2   50.5  
Sm   7.36 10.1     9.33
Eu   2.44   3.07   3.10
Tb   1.08   1.32   1.18
Yb   2.90   2.61   1.99
Lu   0.36   0.34   0.25
Y 40      37      25     

Major element concentration for element oxides SiO2 to P2O5 in weight percent.
Loss on ignition (LOI) in weight percent.
Trace element concentration for elements Ni to Y in parts per million.