Table 4.

Electron microprobe wavelength-dispersive spectrometry results for epidote, biotite and pyroxenes

∑ analysesAverage epidoteAverage biotiteAverage pyroxene
ObasaraighEavalBorve PeninsulaEaval
34332
Weight %
SiO239.6238.2236.4553.5053.54
TiO20.110.084.060.060.32
Al2O322.3124.6216.232.182.81
Cr2O30.000.000.000.000.00
Fe2O30.000.000.000.000.00
FeO11.3810.9817.675.3311.59
MnO0.130.090.200.260.28
MgO1.130.0710.6514.7215.87
CaO21.9123.000.0123.7812.45
Na2O0.080.070.040.550.33
NiO0.000.000.020.000.00
K2O0.000.0010.020.000.00
Cl0.010.000.29
F0.040.040.26
∑ weight %96.7297.1895.90100.3896.96
a.f.u.     
Si2.572.472.851.972.06
Ti0.010.000.240.000.01
Al1.701.871.500.110.13
Cr0.000.000.000.000.00
Fe3+2.031.950.000.000.00
Fe2+0.000.001.160.160.37
Mn0.010.000.010.010.01
Mg0.110.011.240.810.91
Ca1.521.590.000.940.51
Na0.000.000.010.010.00
Ni0.000.000.000.000.00
K0.000.001.000.000.00
Cl0.000.000.04
F0.010.010.06
OH0.990.991.90
∑ cations7.957.898.054.004.00

FeO recalculated to provide Fe3+ in epidote.