Blueschist mylonitic zones accommodating syn-subduction exhumation of deeply buried continental crust: the example of the Rocca Canavese Thrust Sheets Unit (Sesia–Lanzo Zone, Italian Western Alps)

Swiss Journal of Geosciences

Table 10 Definition of the ERV and calculation of the EBC of the garnet-bearing gneiss (ZR4)

Microdomain vs. Thin Section Garnet Normalization
Garnet Selection	Pixels	%
Garnet domain	16,105	6.44
Garnet 2–3 domain	7710	3.08
Garnet thin section domain	7492	8.56
Garnet 2–3 in thin section	3586	4.10
Amount to be used	4.10

Mineral average composition	New Modal %	Na₂O	TiO₂	MnO	K₂O	MgO	SiO2	Fe₂O₃	FeO	CaO	Al₂O₃	H₂O	Total
Wm	33.36	0.13	0.20	0.10	10.71	2.86	51.16	0.00	4.19	0.15	25.65	4.84	100.00
Grt2-Grt3	4.29	0.02	0.08	3.11	0.02	0.56	37.56	0.69	26.71	10.60	20.66	0.00	99.99
Cpx	32.06	14.15	0.03	0.02	0.04	0.39	59.19	1.30	1.33	1.01	22.53	0.00	100.00
Qtz	23.82	0.00	0.00	0.00	0.00	0.00	100.00	0.00	0.00	0.00	0.00	0.00	100.00
Ep	0.37	0.01	0.06	0.07	0.03	0.02	38.61	0.38	8.32	23.09	27.12	2.29	100.00
Ttn	5.66	0.03	38.18	0.02	0.15	0.01	30.86	0.00	0.38	28.00	2.35	0.00	100.00
Am	0.45	7.33	0.03	0.08	0.03	5.54	56.51	0.47	16.27	0.36	11.21	1.95	99.80
EBC	100.00	4.61	2.24	0.17	3.59	1.13	63.61	0.45	3.10	2.50	16.95	1.63	100.00
EBC normalized with no H₂O	100.00	4.69	2.28	0.18	3.65	1.15	64.67	0.46	3.15	2.54	17.23	0.00	100.00