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Table 11 Major element composition of central Aar granite (cAgr), southern Aar granite (sAgr), Permian rhyolites (Intschi formation, Tscharren formation) and pre-Variscan basement (wt%)

From: Bristen granite: a highly differentiated, fluorite-bearing A-type granite from the Aar massif, Central Alps, Switzerland

Unit CAgr SAgr Intschi Tscharren Basement
Sample KB 1366 KB 1367 KB 1356 KB 1357 KB 1351a
Tunnel metera 14.600 16.650 10.035 13.800 15.130
SiO2 69.68 69.33 73.44 74.85 72.61
TiO2 0.27 0.35 0.17 0.14 0.38
Al2O3 15.14 15.59 12.15 12.19 13.26
FeOb 2.05 2.02 1.54 1.27 2.03
MnO 0.06 0.05 0.05 0.03 0.06
MgO 0.60 0.79 0.32 0.23 0.71
CaO 2.19 2.10 1.26 1.26 1.68
Na2O 4.27 3.75 3.23 3.58 4.59
K2O 3.91 4.33 4.82 4.22 1.69
P2O5 0.07 0.12 0.09 0.05 0.14
Total major 98.24 98.43 97.07 97.82 97.15
LOI 1.31 0.96 1.71 0.87 2.76
Total 99.55 99.39 98.78 98.69 99.91
Na2O + K2O 8.18 8.08 8.05 7.80 6.28
  1. LOI = Loss on ignition
  2. aDistance from north portal in kilometer
  3. bTotal iron is given as FeO