Tectonometamorphic history of the Gruf complex (Central Alps): exhumation of a granulite–migmatite complex with the Bergell pluton

Swiss Journal of Geosciences

Table 1 Representative bulk compositions of rocks from the Gruf complex (see Fig. 2)

Rock type	Migmatitic bt-orthogneiss			Enclave-rich bt-orthogneiss		Charnockite			Leucogranite			Augengneiss
Sample	Or6	TeGrl	HvGrl3	DLOG1	Scl3	PeCh6	BoGrl	Conc14	HvOG3	Pial	RoGr3	HvOG2
Location	Val Scarione	Val Casnaggina	Biv. Vaninetti	Val Bondasca	Val Schiesone	Val Vertura	Val Bondasca	Valle del Conco	Biv. Vaninetti	Val Piana	Val Vertura	Biv. Vaninetti
SiO₂	65.21	64.16	68.36	67.47	66.45	68.579	64.94	72.76	73.68	74.04	71.05	69.02
TiO₂	0.61	0.72	0.45	0.48	0.58	0.529	0.68	0.34	0.18	0.18	0.34	0.68
A1₂O₃	16.46	16.58	15.85	16.01	15.98	15.510	16.24	14.71	14.38	13.96	14.82	14.54
FeO*	4.48	5.09	3.48	3.54	4.12	4.695	4.83	2.82	1.59	1.56	2.24	4.00
MnO	0.07	0.09	0.06	0.05	0.06	0.096	0.08	0.03	0.03	0.04	0.02	0.05
MgO	1.50	1.37	0.85	0.91	1.03	1.870	2.17	0.72	0.32	0.33	0.69	1.11
CaO	3.61	3.70	3.07	3.26	3.02	2.964	4.36	2.78	0.81	0.97	1.12	1.93
Na₂O	3.82	4.43	3.62	3.60	3.77	3.246	3.85	3.01	2.78	3.21	3.15	3.33
K₂O	3.21	2.48	3.52	3.55	3.52	2.827	2.20	2.30	5.05	4.85	5.13	4.22
P₂O₅	0.23	0.26	0.15	0.16	0.27	0.152	0.21	0.09	0.21	0.18	0.15	0.24
Cr₂O₃	0.00	0.00	0.00	0.00	0.00	0.005	0.00	0.00	0.00	0.00	0.00	0.00
H₂O	0.47	0.49	0.39	0.49	0.62	0.314	0.58	0.29	0.89	0.59	0.70	0.59
Total	99.69	99.37	99.79	99.51	99.42	100.79	100.14	99.86	99.92	99.92	99.41	99.72
A/CNK	1.01	0.99	1.03	1.02	1.03	1.12	0.98	1.18	1.25	1.14	1.16	1.07
x (Mg)	0.37	0.32	0.30	0.31	0.31	0.41	0.44	0.31	0.26	0.27	0.35	0.33

The complete geochemical database is presented in Online Resource 1
* Total iron as FeO. H₂O content estimated from Loss of Ignition (LOI); A/CNK = Al₂O₃/(CaO + Na₂O + K₂O)(molar ratio); X_Mg = MgO/(MgO + FeO)