Strain localization via mechanical mixing and metasomatism: an example from the metagabbros of Marine de Giottani, Alpine Corsica, France

De la géologie structurale à la géodynamique : un numéro thématique dédié à la contribution de l’école rennaise de tectonique - Hommage à J-P Brun, P. Choukroune et P.R. Cobbold

Open Access

Table 3

Average bulk chemical compositions of the metagabbros (n = 10), schists (n = 4) and serpentinite clasts (n = 4).

Samples	metagabbros		chl-amph-schists		serpentinites
Samples	Protoliths C⁰ (n=10)		Altered rocks C^A (n=4)		Ultramafic enclaves (n=4)

	geom. mean	stand. dev.	geom. mean	stand. dev.	geom. mean	stand. dev.
Wt%
SiO₂	48.30	0.56	45.03	1.83	41.00	0.44
Al₂O₃	17.11	0.92	8.12	0.69	1.74	0.31
Fe₂O₃	4.23	0.53	6.57	1.03	8.69	1.22
MgO	10.74	0.75	26.53	1.76	36.38	1.09
CaO	13.19	1.20	6.68	0.86	0.08	0.20
Na₂O	2.31	0.37	0.19	0.08	0.09	0.29
K₂O	0.07	0.03	0.06	0.00	0.11	0.20
TiO₂	0.20	0.03	0.14	0.03	0.04	0.01
MnO	0.09	0.01	0.10	0.01	0.11	0.01
P₂O₅	0.03	0.01	0.02	0.01	0.00	0.01
L.O.I.	3.11	0.16	5.70	0.97	10.80	0.63
Total	99.38	0.25	99.14	0.24	99.03	0.27

Density	2.96	0.07	2.83	0.01	2.61	0.10

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