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 3b

Orthopyroxenes: (b) indicates border, (c) indicates core, and (i) indicates inclusion.

Rock type Sample Analyses	MBA11 C1	BIW88A C3(i)	C3-1	C3(i)	C2	Basanite C4 (b)	C4(c)	BIW88 C4	C5(b)	C5(c)	C6(b)	C6(c)	C1(b)	C1 (c)	C2(c)	C2	C4(c)	Lherzolite C4(c)	BIW805 C6 (b)	C6 (c)	C6 (c)	C6(i)
SiO₂	55.70	55.96	57.63	57.27	56.17	56.00	56.07	55.61	56.00	55.08	56.12	56.11	56.07	56.10	55.73	55.48	55.91	55.77	56.3	56.46	54.96	55.51
TiO₂	0.10	0.06	0.03	0.05	0.06	0.06	0.06	0.05	0.07	0.17	0.05	0.06	0.05	0.04	0.06	0.06	0.04	0.04	0.05	0.04	0.04	0.06
Al₂O₃	4.71	3.66	2.50	2.59	3.93	4.11	4.15	4.44	3.94	4.96	3.82	4.13	3.38	3.55	4.23	4.18	3.57	3.54	3.04	3.15	5.05	5.05
Cr₂O₃	0.33	0.76	0.15	0.16	0.33	0.37	0.37	0.39	0.35	0.53	0.32	0.36	0.22	0.28	0.37	0.34	0.29	0.27	0.24	0.25	0.42	0.45
FeO	6.65	5.74	6.63	6.50	6.67	6.70	6.63	6.44	6.68	5.64	6.68	6.66	6.26	6.39	6.59	6.40	6.34	6.55	6.26	6.32	6.31	6.31
MnO	0.23	0.14	0.07	0.13	0.16	0.18	0.13	0.16	0.18	0.11	0.13	0.14	0.22	0.15	0.17	0.21	0.14	0.14	0.23	0.10	0.17	0.20
MgO	32.29	32.43	34.39	33.73	32.97	32.95	33.17	33.01	33.28	28.43	33.36	33.19	32.67	32.65	32.98	32.49	32.54	32.79	33.31	33.43	32.04	31.3
CaO	0.73	1.18	0.37	0.30	0.37	0.30	0.33	0.37	0.32	5.44	0.31	0.33	0.47	0.50	0.40	0.51	0.58	0.46	0.29	0.36	0.82	1.26
Na₂O	0.13	0.12	0.04	0.04	0.05	0.06	0.05	0.07	0.05	0.44	0.02	0.02	0.08	0.04	0.04	0.04	0.06	0.04	0.05	0.04	0.12	0.15
K₂O	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.03	0.01	0.02	0.01
NiO	0.14	0.08	0.13	0.11	0.11	0.08	0.09	0.11	0.11	0.08	0.06	0.09	0.07	0.06	0.10	0.08	0.10	0.10	0.11	0.12	0.07	0.04
TOTAL	101.01	100.14	101.94	100.88	100.82	100.81	101.05	100.65	100.98	100.89	100.87	101.09	99.49	99.76	100.67	99.79	99.57	99.7	99.91	100.28	100.02	100.34
Si	1.91	1.93	1.95	1.96	1.93	1.92	1.92	1.91	1.92	1.91	1.92	1.92	1.94	1.94	1.91	1.92	1.94	1.93	1.94	1.94	1.90	1.91
Al	0.09	0.07	0.05	0.04	0.08	0.08	0.08	0.09	0.08	0.09	0.08	0.08	0.06	0.06	0.09	0.08	0.06	0.07	0.06	0.06	0.10	0.09
Al	0.10	0.08	0.05	0.06	0.08	0.09	0.08	0.09	0.08	0.11	0.08	0.08	0.08	0.08	0.09	0.09	0.08	0.08	0.07	0.07	0.11	0.12
Fe³⁺	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Cr	0.01	0.02	0.00	0.00	0.01	0.01	0.01	0.01	0.01	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
Ti	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Fe²⁺	0.19	0.17	0.19	0.19	0.19	0.19	0.19	0.19	0.19	0.16	0.19	0.19	0.18	0.19	0.19	0.19	0.18	0.19	0.18	0.18	0.18	0.18
Mn	0.01	0.00	0.00	0.00	0.01	0.01	0.00	0.01	0.01	0.00	0.00	0.00	0.01	0.00	0.01	0.01	0.00	0.00	0.01	0.00	0.01	0.01
Mg	1.65	1.67	1.74	1.72	1.68	1.68	1.69	1.69	1.70	1.47	1.70	1.69	1.69	1.68	1.69	1.68	1.68	1.69	1.71	1.71	1.65	1.61
Ca	0.03	0.04	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.20	0.01	0.01	0.02	0.02	0.02	0.02	0.02	0.02	0.01	0.01	0.03	0.05
Na	0.01	0.01	0.00	0.00	0.00	0.00	0.00	0.01	0.00	0.03	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.01
K	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
SUM	3.99	3.99	4.00	3.99	3.99	3.99	4.00	4.00	4.00	4.00	4.00	3.99	4.00	3.99	4.00	3.99	3.99	3.99	3.99	3.99	4.00	3.98
Fe²⁺/(Fe²⁺+Fe³⁺)	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.10	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00
XMg	0.90	0.91	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90	0.90
Wo	1.42	2.31	0.69	0.57	0.72	0.58	0.64	0.72	0.61	10.82	0.60	0.64	0.92	0.98	0.77	1.00	1.14	0.90	0.56	0.69	1.62	2.51
En	87.62	88.26	89.40	89.40	88.77	88.79	89.00	89.04	88.92	78.66	89.12	89.04	88.87	88.86	88.86	88.71	88.71	88.78	89.47	89.51	87.96	86.78
Fs	10.49	9.00	9.78	9.89	10.34	10.42	10.19	10.00	10.29	8.94	10.22	10.25	9.92	10.02	10.23	10.15	9.94	10.18	9.80	9.66	9.99	10.17
Ac	0.46	0.43	0.14	0.14	0.18	0.21	0.17	0.25	0.17	1.58	0.07	0.07	0.28	0.14	0.14	0.14	0.21	0.14	0.18	0.14	0.43	0.54

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