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 1

Representative analyses of feldspars from Bini Warack lavas: (b) indicates border, (m) indicates middle, and (c) indicates core.

Rock type	Basanite

Sample	BIW88AC1			MBA11	SAF88			Sot22
Analyse	C1	C1 (c)	C4	C3	C1(m)	C3(m)	C4(m)	C1(m)	C3	C3	C4	C4	C5	C5	C5
SiO₂	52.39	53.51	52.32	66.89	52.88	53.54	53.55	51.52	52.91	54.91	52.60	52.10	51.44	51.23	50.53
TiO₂	0.56	0.20	0.15	0.00	0.12	0.16	0.32	0.08	0.15	0.21	0.17	0.16	0.04	0.09	0.12
Al₂O₃	28.49	28.72	29.81	18.56	28.65	29.02	27.43	29.81	28.50	26.25	29.08	28.94	29.40	29.29	29.71
FeO	1.12	0.71	0.47	0.05	0.56	0.63	0.77	0.73	0.44	0.70	0.64	0.64	0.68	0.58	0.68
CaO	11.52	11.28	12.95	0.08	11.56	11.93	11.07	12.80	11.98	8.72	12.34	12.32	13.02	13.16	13.40
Na₂O	4.60	4.75	4.14	5.32	4.75	4.85	5.08	3.74	4.36	5.63	3.88	4.11	3.92	3.83	3.30
K₂O	1.21	0.44	0.33	8.85	0.26	0.29	0.91	0.33	0.47	1.34	0.64	0.58	0.52	0.43	0.42
BaO	-	0.07	-	0.00	0.03	-	-	0.10	0.10	0.61	0.11	0.15	0.01	0.08	0.04
MnO	0.02	0.00	0.01	0.00	0.00	0.03	0.04	0.06	0.03	0.01	0.00	0.01	0.02	0.03	0.09
MgO	0.32	0.03	0.08	0.00	0.08	0.02	0.31	0.09	0.06	0.01	0.04	0.10	0.09	0.05	0.16
NiO	0.02	0.05	0.07	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.04	0.00	0.00	0.03
F	-	0.03	-	0.24	0.16	-	-	0.00	0.05	0.00	0.00	0.00	0.37	0.05	0.11
Total	100.27	99.80	100.35	99.99	99.07	100.47	99.48	99.27	99.07	98.43	99.49	99.16	99.53	98.83	98.60
Si	9.61	9.75	9.51	12.059	9.71	9.69	9.84	9.47	9.72	10.16	9.63	9.60	9.48	9.48	9.39
Ti	0.08	0.03	0.02	0.00	0.02	0.02	0.04	0.01	0.02	0.03	0.02	0.02	0.01	0.01	0.02
Al	6.18	6.17	6.39	3.94	6.20	6.19	5.94	6.46	6.17	5.72	6.27	6.28	6.39	6.39	6.51
Fe²⁺	0.17	0.11	0.07	0.01	0.09	0.10	0.12	0.11	0.07	0.11	0.10	0.10	0.11	0.09	0.11
Ca	2.26	2.20	2.52	0.02	2.28	2.31	2.18	2.52	2.36	1.73	2.42	2.43	2.57	2.61	2.67
Na	1.64	1.68	1.46	1.86	1.69	1.70	1.81	1.33	1.55	2.02	1.38	1.47	1.40	1.37	1.19
K	0.28	0.10	0.08	2.04	0.06	0.07	0.21	0.08	0.11	0.32	0.15	0.14	0.12	0.10	0.10
Ba	0.00	0.01	0.01	0.00	0.00	0.00	0.00	0.01	0.01	0.04	0.01	0.01	0.00	0.01	0.00
SUM	20.20	20.03	20.05	19.92	20.05	20.08	20.15	19.99	20.01	20.12	19.98	20.04	20.08	20.06	19.98
An	54.12	55.30	62.16	0.40	56.49	56.67	51.86	64.13	58.64	42.53	61.32	60.25	62.80	63.88	67.43
Ab	39.11	42.14	35.96	47.55	42.00	41.69	43.07	33.91	38.62	49.69	34.89	36.37	34.22	33.64	30.05
Or	6.77	2.57	1.87	52.05	1.51	1.64	5.08	1.97	2.74	7.78	3.79	3.38	2.97	2.49	2.52

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