Petrogenetic link between metasedimentary rocks, migmatites and granitoids in the Variscan basement of the Pontgibaud area, French Massif Central – implications for the crustal structure

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Table 2

Representative mineral compositions in oxide weight per cent for biotite, muscovite, plagioclase and garnet.

	Biotite				Muscovite		Plagioclase				Garnet

Sample	PG20-01	PG20-02	PG21-04	PG21-28	PG20-01	PG21-04	PG20-01	PG20-02	PG21-04	PG21-28	PG21-28
Texture	matrix	matrix	matrix	matrix	inclusion	matrix	matrix	matrix	matrix	matrix	rim	core
Na2O	0.07	0.28	0.33	0.13	0.46	1.14	10.35	10.84	10.67	9.21	0.04	0
Al2O3	18.63	18.45	19.66	19.45	35.02	35.90	21.74	20.94	21.33	23.03	20.89	20.77
SiO2	35.13	34.86	35.58	34.63	46.51	45.86	64.54	65.48	66.37	62.95	36.91	36.96
K2O	9.39	8.63	8.75	9.67	10.38	9.39	0.15	0.33	0.14	0.16	0.01	0
MnO	0.18	0.14	0.13	0.33	0.05	0.02	0.03	0.04	0.00	0.03	10.89	9.89
FeO	18.39	18.76	18.61	18.23	0.90	0.76	0.08	0.00	0.01	0.03	26.98	27.21
MgO	8.55	8.31	9.51	9.01	0.80	0.56	0.04	0.00	0.00	0.00	3.12	3.21
TiO2	3.26	3.67	2.01	2.54	0.75	0.64	0.00	0.00	0.00	0.00	0	0
CaO	0.00	0.00	0.00	0.00	0.00	0.00	2.82	1.82	1.90	4.12	0.79	0.87
Total	93.71	93.83	95.09	94.65	95.08	94.88	99.74	99.52	100.43	99.53	99.64	98.92
XMn											0.26	0.29
XFe	0.55	0.56	0.52	0.53							0.60	0.53
XMg	0.45	0.44	0.48	0.47							0.12	0.15
XCa							12.98	8.34	8.92	19.73	0.03	0.03
Si					3.10	3.06

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