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

Swiss Journal of Geosciences

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%)

Unit	CAgr	SAgr	Intschi	Tscharren	Basement
Sample	KB 1366	KB 1367	KB 1356	KB 1357	KB 1351a
Tunnel meter^a	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
FeO^b	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