Table 3

Bulk-chemical analysis (wt%) for all samples in order of increasing alteration; samples selected for further analysis are italicized

OxidesSanC-ASanC-BSanC-CSanC-FSanC-ISanC-JSanC-K
SiO244.043.644.845.344.145.045.5
TiO22.792.672.732.722.682.662.70
Al2O315.014.714.614.814.715.114.6
Cr2O30.000.000.000.000.000.000.00
Fe2O3Ta13.512.513.413.113.113.312.9
MnO0.200.190.200.200.200.200.20
MgO8.037.809.048.357.797.408.08
CaO7.907.747.667.647.737.387.58
Na2O3.344.863.925.274.304.625.27
K2O2.271.162.551.481.282.841.28
P2O50.750.730.770.790.850.860.85
  Total97.095.298.998.895.898.498.1
Loss3.04.81.11.24.21.61.9
CaO+Na2O+K2O55.2556.2156.458.1656.1656.9758.32
Na2O+K2O5.616.026.476.755.587.466.55
  • a All Fe is reported as Fe2O3T.