Neoproterozoic magmatic accretion and Pan-African reworking-differentiation of mafic crust derived from an enriched mantle: evidences from structural analysis, petrology and geochemistry of the Ketté gold district (Eastern Cameroon)

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Table 1

Whole rock geochemical data for amphibolite, metapyroxenite, migmatite and paragneiss.

Rocks	Amphibolite			Metapyroxenite	Migmatite	Gneisses

Samples	GN7	NGN5	NGN3	OUN2	GN3	TN1	TN2	GN6
wt%
SiO₂	54.80	43.96	52.11	43.76	72.22	71.83	73.95	53.65
Al₂O₃	15.68	15.31	14.95	16.73	10.01	12.58	11.59	18.22
Fe₂O₃	9.61	14.32	7.45	12.26	7.10	4.76	4.62	9.23
MnO	0.14	0.31	0.18	0.18	0.11	0.09	0.07	0.10
MgO	5.19	7.36	6.81	7.07	1.91	1.52	1.45	3.85
CaO	6.46	9.08	6.88	9.24	1.41	2.47	2.11	6.61
Na₂O	0.62	2.63	2.76	2.95	2.00	3.20	3.16	0.88
K₂O	3.41	2.52	5.04	2.55	3.13	1.72	1.64	3.48
TiO₂	1.34	1.96	1.07	1.59	0.98	0.63	0.55	1.26
P₂O₅	0.62	0.17	0.63	0.85	< L.D.	0.17	0.13	0.55
LOI	0.97	1.19	1.27	1.49	0.48	0.89	0.74	0.98
Total	98.83	98.80	99.15	98.66	99.35	99.85	100.01	98.80
FeOt	8.65	12.89	6.70	11.03	6.39	4.28	4.16	8.31
Mg#	51.69	50.45	64.42	53.33	34.77	38.75	38.34	45.25
A/CNK	0.95	0.65	0.66	0.69	1.08	1.08	1.07	1.06
A/NK	3.33	2.17	1.50	2.20	1.50	1.77	1.66	3.49
ppm
As	< L.D.	< L.D.	< L.D.	0.78	< L.D.	< L.D.	< L.D.	< L.D.
Ba	1367	104	2071	2439	271	137	116	1635
Be	3.45	3.44	2.50	1.56	2.09	2.97	2.76	2.68
Bi	0.09	0.30	0.11	0.15	< L.D.	0.07	0.05	0.05
Cd	0.12	0.58	0.28	0.20	0.06	0.04	0.04	0.05
Co	30.7	50.1	30.9	43.5	13.7	9.93	9.99	22.7
Cr	261	255	434	58.7	323	136	266	206
Cs	7.48	7.43	4.24	2.40	10.0	5.54	5.16	10.5
Cu	14.0	19.2	< L.D.	41.0	3.0	14.0	10.9	11.8
Ga	25.1	24.1	22.0	22.2	20.1	17.9	15.3	25.1
Ge	1.89	2.32	1.57	1.65	1.40	1.52	1.60	1.42
Hf	3.69	3.50	3.82	4.15	10.5	5.46	5.47	4.34
In	0.12	0.19	0.06	0.08	0.05	0.08	0.07	0.05
Mo	13.8	1.40	1.50	1.47	18.5	5.45	13.6	10.4
Nb	10.5	4.83	12.0	6.03	9.13	12.5	10.4	8.32
Ni	23.6	75.7	136	29.1	30.9	17.4	17.6	12.8
Pb	6.83	8.00	20.7	8.46	13.3	12.8	12.4	8.29
Rb	238	179	207	91.9	242	198	186	243
Sb	0.10	0.08	0.07	0.19	0.08	0.08	0.09	0.08
Sc	27.14	47.57	18.33	33.96	15.01	10.73	10.07	19.16
Sn	2.62	8.22	3.28	1.60	1.30	2.55	2.61	1.29
Sr	658	115	507	1259	102	161	148	777
Ta	1.12	0.44	0.71	0.33	0.12	1.00	0.95	0.71
Th	8.84	2.29	7.17	2.24	33.7	12.3	10.8	13.0
U	3.44	1.31	2.09	0.50	56.6	3.74	4.17	2.24
V	210	305	152	258	104	68.8	59.5	171
W	10.7	70.6	1.06	1.16	12.6	4.63	14.1	9.17
Y	31.2	48.9	20.7	30.8	5.20	13.4	11.3	19.1
Zn	100	183	115	118	123	79.7	82.8	95.1
Zr	132	124	155	162	387	198	202	167
La	36.5	57.8	37.2	44.7	34.1	28.2	19.2	44.8
Ce	96.7	110	64.0	101	153	59.4	43.6	92.1
Pr	12.9	12.3	9.53	13.2	9.30	6.90	5.31	11.0
Nd	54.3	46.4	39.3	57.5	33.4	25.3	19.9	44.0
Sm	11.3	9.31	7.91	11.8	5.81	4.83	4.00	8.44
Eu	2.87	2.47	2.02	3.44	0.453	0.70	0.60	1.96
Gd	8.55	8.80	6.03	8.97	3.70	3.71	2.99	6.23
Tb	1.17	1.40	0.77	1.18	0.40	0.52	0.44	0.79
Dy	6.37	8.81	3.89	6.41	1.63	2.86	2.42	4.18
Ho	1.19	1.87	0.69	1.20	0.23	0.54	0.45	0.76
Er	3.06	5.00	1.67	2.99	0.511	1.37	1.16	1.85
Tm	0.45	0.74	0.23	0.41	0.07	0.19	0.16	0.25
Yb	2.91	4.66	1.37	2.51	0.54	1.23	0.998	1.54
Lu	0.42	0.70	0.21	0.36	0.09	0.19	0.15	0.22
ΣREE	238.69	270.27	174.81	255.67	243.24	135.94	101.38	218.12
Eu/Eu*	0.89	0.83	0.89	1.02	0.3	0.5	0.53	0.82
(Ce/Sm)_N	2.09	2.88	1.97	2.09	6.42	3	2.66	2.66
(Gd/Yb)_N	2.43	1.56	3.64	2.95	5.67	2.49	2.48	3.34
(La/Yb)_N	8.68	8.59	18.8	12.33	43.72	15.87	13.32	20.14

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