Sub-continental lithospheric mantle beneath the Adamawa volcanic area (Cameroon Volcanic Line): inference from lavas and hosted mantle xenoliths from Bini Warack, NE-Ngaoundéré, Cameroon (Central Africa)

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Table 3

Representative analyses of pyroxenes; a- clinopyroxenes.

Rock type					Basanite			Latite	Lherzolite
Sample	Sot22		HOL32			BIW88		BJM59A	BIW805
Analyse	C6	C6	C1	C1	C1	C5 (i)	C6	C5	C3	C7(i)	C7(i)
SiO₂	47.25	37.41	46.86	44.64	47.99	53.02	53.14	49.38	53.09	52.82	52.8
TiO₂	3.58	7.67	2.54	3.95	2.47	0.37	0.34	1.65	0.29	0.28	0.30
Al₂O₃	6.69	11.07	5.58	8.20	5.47	6.12	5.90	4.52	5.51	5.92	6.15
Cr₂O₃	0.03	0.00	0.08	0.42	0.12	0.80	0.78	0.13	0.70	0.00	0.00
FeO	8.85	12.02	7.20	7.19	6.89	2.33	2.40	10.73	2.41	2.41	2.44
MnO	0.26	0.23	0.09	0.11	0.21	0.09	0.03	0.22	0.13	0.03	0.14
MgO	10.82	8.25	13.38	11.84	13.63	14.50	14.68	13.69	14.82	14.8	14.86
CaO	21.37	19.86	23.19	22.74	22.86	22.11	22.09	18.82	21.44	21.68	20.98
Na₂O	0.79	0.89	0.44	0.56	0.42	1.73	1.61	0.52	1.66	1.65	1.70
K₂O	0.13	0.19	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.01	0.01
NiO	0.11	0.00	0.03	0.00	0.05	0.00	0.00	0.00	0.04	0.06	0.03
Total	99.88	97.59	99.39	99.66	100.11	101.07	100.97	99.66	100.09	99.66	99.41
Si	1.78	1.49	1.77	1.69	1.79	1.90	1.91	1.86	1.92	1.92	1.92
Al^IV	0.22	0.51	0.23	0.31	0.21	0.10	0.09	0.14	0.08	0.09	0.08
Al^VI	0.08	0.01	0.02	0.05	0.03	0.16	0.16	0.06	0.15	0.17	0.18
Fe³⁺	0.00	0.18	0.14	0.10	0.09	0.03	0.02	0.04	0.01	0.03	0.01
Cr	0.00	0.00	0.00	0.01	0.00	0.02	0.02	0.00	0.02	0.00	0.00
Ti	0.10	0.23	0.07	0.11	0.07	0.01	0.01	0.05	0.01	0.01	0.01
Fe²⁺	0.28	0.22	0.08	0.12	0.12	0.04	0.06	0.29	0.06	0.05	0.06
Mn	0.01	0.01	0.00	0.00	0.01	0.00	0.00	0.01	0.00	0.00	0.00
Mg	0.61	0.49	0.75	0.67	0.76	0.76	0.79	0.77	0.80	0.80	0.80
Ca	0.86	0.85	0.94	0.92	0.96	0.85	0.85	0.76	0.83	0.84	0.82
Na	0.06	0.07	0.03	0.04	0.03	0.12	0.11	0.04	0.12	0.12	0.12
K	0.01	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
SUM	4.00	4.06	4.05	4.03	4.03	4.01	4.01	4.01	4.00	4.01	4.01
Fe²⁺/(Fe²⁺+Fe³⁺)	0.99	0.54	0.37	0.55	0.56	0.62	0.79	0.88	0.84	0.64	0.81
XMg	0.69	0.70	0.90	0.84	0.86	0.95	0.93	0.72	0.93	0.95	0.93
Wo	47.52	46.87	48.08	49.56	47.54	46.740	46.68	39.76	45.57	45.97	44.88
En	33.48	27.09	38.61	35.91	39.44	42.66	43.17	40.25	43.83	43.67	44.23
Fs	15.81	22.24	11.66	12.32	11.44	3.99	4.00	18.00	4.21	4.03	4.31
Ac	3.18	3.80	1.65	2.21	1.58	6.62	6.16	1.99	6.39	6.33	6.58

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