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 6

Whole-rock chemical analyses of the studied mantle xenoliths.

Rock type	Lherzolite
sample	BIW 88E	BIW 88-2	BIW 88-1	BIW 88-3	BIW 88-5	BIW 88-4
SiO₂	45.23	44.62	43.83	44.29	45.33	41.08
Al₂O₃	3.31	3.87	3.29	2.13	3.30	1.38
Fe₂O₃	8.55	8.98	9.05	8.72	8.87	9.02
MgO	34.61	34.54	34.02	39.23	37.51	39.70
CaO	4.18	4.65	5.10	3.17	2.81	4.31
Na₂O	0.22	0.24	0.26	0.20	0.22	0.14
K₂O	0.07	0.10	0.16	0.06	0.04	0.05
TiO₂	0.09	0.08	0.08	0.11	0.07	0.08
P₂O₅	<L.D.	<L.D.	<L.D.	<L.D.	<L.D.	<L.D.
MnO	0.12	0.13	0.12	0.12	0.13	0.13
LOI	2.99	2.44	3.37	1.11	1.08	3.06
Total (wt%)	99.37	99.65	99.28	99.14	99.35	98.95
Mg#	88.90	88.40	88.20	89.90	89.30	89.70
Trace (ppm)
Cs	0.07	0.08	0.08	0.05	0.05	0.06
Rb	6.48	7.94	12.11	4.78	3.49	4.12
Ba	8.90	10.90	8.78	<L.D.	7.13	7.67
Sr	84.62	70.41	76.40	52.00	13.95	182.35
Pb	0.51	<L.D.	<L.D.	<L.D.	<L.D.	<L.D.
Th	0.10	0.10	0.04	0.05	0.15	0.12
U	0.04	0.07	0.06	0.03	0.06	0.07
Zr	6.03	1.63	2.99	9.30	4.47	6.78
Hf	0.14	0.08	0.09	0.23	0.08	0.15
Ta	0.07	0.01	0.01	0.03	0.03	0.07
Y	2.41	2.63	2.40	2.40	2.37	1.68
Nb	1.92	0.40	0.44	0.56	0.73	1.29
Sc	15.26	17.47	15.47	13.04	15.69	9.42
Cr	2910.95	2980.16	3020.06	2500.54	2804.73	1459.50
Ni	1867.04	1725.95	1919.51	2115.29	1878.44	2372.31
Co	99.57	98.79	105.34	105.82	103.47	118.56
V	69.36	83.74	70.880	52.13	66.92	37.41
W	3.85	3.40	4.48	5.18	5.46	4.28
Ga	3.02	3.49	2.94	2.42	2.83	1.39
Zn	56.03	58.85	56.60	50.93	52.14	52.78
Cu	16.85	21.56	24.66	7.98	19.06	8.52
As	<L.D.	<L.D.	0.51	<L.D.	0.749	0.67
Cd	0.05	0.03	0.05	0.09	0.03	0.03
Ge	0.80	0.91	0.78	0.82	0.81	0.73
Mo	5.01	4.63	6.07	7.91	8.93	5.49
Sb	0.16	0.22	0.12	0.08	0.15	0.14
Sn	0.45	<L.D.	0.36	<L.D.	0.41	0.33
Ta	0.07	0.01	0.01	0.03	0.03	0.07
La	0.86	1.25	0.72	0.90	0.79	0.81
Ce	1.49	1.37	0.71	2.45	0.90	1.67
Pr	0.18	0.11	0.07	0.38	0.08	0.20
Nd	0.74	0.38	0.32	1.79	0.32	0.84
Sm	0.20	0.15	0.13	0.45	0.13	0.21
Eu	0.08	0.07	0.06	0.16	0.05	0.08
Gd	0.27	0.26	0.24	0.45	0.21	0.24
Tb	0.05	0.06	0.05	0.07	0.05	0.04
Dy	0.39	0.44	0.39	0.45	0.36	0.29
Ho	0.09	0.11	0.10	0.09	0.09	0.07
Er	0.27	0.31	0.28	0.25	0.28	0.17
Tm	0.04	0.05	0.05	0.04	0.05	0.03
Yb	0.30	0.34	0.31	0.24	0.32	0.19
Lu	0.05	0.05	0.05	0.04	0.05	0.03
Eu/Eu*	1.06	1.01	1.02	1.06	0.97	1.08

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