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)

Open Access

Table 5

Whole-rock chemical analyses of 21 representative host lavas: 6 from this study (italic bold) and 15 from Tiabou et al. (2019).

Rock type					Basanite
Sample	BIW 88A	HOL 32	SAF 88	SOT 22	MBA 11	PK8	PK3	BA19	BA20	BA50	BA5
SiO₂	*40.84*	*41.5*	*41.86*	*42.38*	*43.47*	42.79	42.84	39.2	41.99	41.68	42.68
TiO₂	*3.50*	*2.87*	*3.70*	*2.82*	*2.49*	2.99	3.01	3.01	3.16	3.16	3.16
Al₂O₃	*12.59*	*11.98*	*13.94*	*12.4*	*12.6*	13.88	13.29	11.49	12.89	12.87	12.82
Fe₂O₃	*13.18*	*12.42*	*13.96*	*12.61*	*11.05*	12.06	11.99	13.9	14.32	13.99	14.22
MnO	*0.19*	*0.19*	*0.22*	*0.19*	*0.16*	0.20	0.19	0.22	0.28	0.24	0.19
MgO	*10.62*	*11.35*	*7.47*	*11.36*	*13.37*	7.69	7.63	8.14	7.15	7.16	7.21
CaO	*10.67*	*11.22*	*9.44*	*10.71*	*8.33*	9.88	9.89	12.31	9.33	9.31	8.93
Na₂O	*2.57*	*1.83*	*3.35*	*2.58*	*2.74*	3.30	3.29	3.99	4.35	4.47	4.29
K₂O	*1.38*	*1.60*	*1.98*	*1.72*	*1.53*	1.29	1.33	2.03	2.27	2.37	2.27
P₂O₅	*0.92*	*0.92*	*1.46*	*0.92*	*0.71*	1.16	1.20	1.39	1.44	1.44	1.43
TOTAL (wt.%)	*96.46*	*95.88*	*97.38*	*97.69*	*96.45*	95.24	94.66	95.68	97.18	96.69	97.20
LOI	*2.66*	*3.30*	*1.78*	*1.25*	*2.58*	4.77	4.74	4.65	2.77	2.85	2.73
Mg#	*61.48*	*64.41*	*51.48*	*64.08*	*70.56*	55.80	55.80	53.70	49.70	50.3	50.10
DI	*23.65*	*21.28*	*33.63*	*25.14*	*28.9*	32.16	32.82	29.32	38.18	38.84	39.39
Traces (ppm)
Cs	*0.38*	*0.57*	*0.48*	*0.47*	*0.55*	1.00	1.00	1.00	1.00	1.00	1.00
Rb	*37.44*	*42.48*	*53.31*	*42.81*	*48.81*	37.00	45.00	54.00	58.00	62.00	61.00
Ba	*491.75*	*708.48*	*648.23*	*713.95*	*684.35*	881.00	950.00	990.00	1111.00	979.00	975.00
Sr	*944.17*	*894.01*	*1340.06*	*1093.67*	*1018.6*	1230	1213.00	1377.00	889.00	1401	797.00
Pb	*3.17*	*3.62*	*4.59*	*3.66*	*3.73*	7.00	7.00	25.00	29.00	33.00	32.00
Th	*7.54*	*7.87*	*10.30*	*8.18*	*8.10*	9.00	11.00	17.00	19.00	19.00	19.00
U	*1.96*	*1.97*	*2.77*	*2.05*	*1.92*	1.00	1.00	4.00	4.00	4.00	4.00
Zr	*330.5*	*288.05*	*530.02*	*286.76*	*232.26*	349.00	352.00	427.00	401.00	348.00	339.00
Hf	*7.36*	*6.21*	*11.15*	*6.20*	*4.96*	6.00	6.00	8.00	8.00	8.00	8.00
Ta	*6.01*	*5.67*	*8.12*	*5.68*	*5.13*	3.00	3.00	8.00	8.00	8.00	8.00
Y	*27.8*	*26.08*	*34.38*	*25.13*	*20.10*	23.00	31.00	34.00	37.00	40.00	35.00
Nb	*85.64*	*82.39*	*110.28*	*82.66*	*76.82*	89.00	92.00	151.00	142.00	133.00	137.00
Sc	*22.96*	*25.76*	*14.50*	*24.87*	*17.58*	22.00	24.00	16.00	13.00	14.00	14.00
Cr	*357.56*	*431.6*	*143.48*	*516.77*	*645.61*	179.00	188.00	120.00	121.00	118.00	119.00
Ni	*249.75*	*245.95*	*95.16*	*294.44*	*476.49*	169.00	175.00	110.00	93.00	105.00	103.00
Co	*53.58*	*53.27*	*40.69*	*53.67*	*54.62*	29.00	38.00	46.00	44.00	45.00	39.00
V	*235.8*	*214.98*	*175.43*	*211.28*	*182.31*	221.00	219.00	225.00	224.00	222.00	219.00
W	*2.36*	*2.19*	*1.89*	*3.12*	*2.61*	1.00	1.00	2.00	2.00	2.00	1.00
Ga	*20.15*	*18.24*	*25.61*	*18.63*	*17.18*	22.00	29.00	22.00	26.00	28.00	24.00
Zn	*119.29*	*111.84*	*173.8*	*110.40*	*97.84*	109.00	118.00	130.00	131.00	113.00	116.00
Cu	*38.46*	*46.90*	*24.22*	*46.96*	*38.84*	26.00	37.00	40.00	60.00	58.00	56.00
La	*60.94*	*61.44*	*87.25*	*60.84*	*60.27*	77.00	89.00	125.00	130.00	133.00	131.00
Ce	*122.45*	*120.48*	*175.05*	*118.92*	*110.56*	160.00	164.00	222.00	221.00	226.00	231.00
Pr	*14.14*	*13.72*	*20.35*	*13.39*	*11.76*	10.00	10.00	23.00	23.00	23.00	22.00
Nd	*55.31*	*53.90*	*80.30*	*52.13*	*43.75*	67.00	70.00	83.00	82.00	79.00	77.00
Sm	*10.85*	*10.21*	*15.48*	*9.84*	*7.69*	7.00	8.00	14.00	14.00	15.00	15.00
Eu	*3.41*	*3.20*	*4.75*	*3.07*	*2.42*	2.00	2.00	4.00	4.00	4.00	4.00
Gd	*8.82*	*8.01*	*11.85*	*7.75*	*6.07*	7.00	7.00	11.00	10.00	10.00	11.00
Tb	*1.20*	*1.08*	*1.57*	*1.05*	*0.82*	1.00	1.00	1.00	2.00	2.00	2.00
Dy	*6.28*	*5.78*	*8.03*	*5.63*	*4.40*	5.00	5.00	8.00	8.00	8.00	7.00
Ho	*1.13*	*1.04*	*1.38*	*1.01*	*0.79*	1.00	2.00	1.00	1.00	1.00	1.00
Er	*2.62*	*2.44*	*3.10*	*2.39*	*1.87*	2.00	3.00	3.00	3.00	3.00	3.00
Tm	*0.34*	*0.33*	*0.39*	*0.32*	*0.25*	0.00	0.00	0.00	0.00	0.00	0.00
Yb	*2.00*	*1.92*	*2.27*	*1.88*	*1.47*	3.00	3.00	2.00	2.00	3.00	3.00
Lu	*0.28*	*0.27*	*0.31*	*0.27*	*0.22*	0.00	0.00	0.00	0.00	0.00	0.00
Eu/Eu*	*1.06*	*1.08*	*1.07*	*1.07*	*1.08*	0.87	0.82	0.98	1.03	1.00	0.95
Norm CIPW
Orthose	*8.55*	*10.00*	*12.19*	*10.54*	*9.44*	8.09	8.40	-	13.99	14.67	13.98
Albite	*5.99*	*5.33*	*11.94*	*5.18*	*13.8*	17.45	18.13	-	7.44	5.91	10.72
Anorthite	*19.69*	*20.83*	*17.84*	*17.79*	*18.44*	20.44	18.77	7.88	9.32	8.44	9.40
Leucite	-	-	-	-	-	-	-	9.96	-	-	-
Nepheline	*9.11*	*5.95*	*9.50*	*9.42*	*5.66*	6.61	6.29	19.36	16.76	18.27	14.69
Diopside	*23.87*	*25.45*	*17.12*	*25.03*	*16.01*	19.19	20.58	35.76	23.95	24.71	22.21
Larnite	-	-	-	-	-	-	-	2.08	-	-	-
Olivine	*21.20*	*22.19*	*18.09*	*22.02*	*27.98*	17.12	16.54	12.95	16.24	15.70	16.74
Magnetite	*2.39*	*2.26*	*2.51*	*2.26*	*2.00*	2.21	2.21	2.54	2.58	2.53	2.56
Ilmenite	*6.97*	*5.74*	*7.31*	*5.55*	*4.95*	6.03	6.11	6.05	6.26	6.29	6.25
Apatite	*2.24*	*2.25*	*3.52*	*2.21*	*1.72*	2.85	2.97	3.41	3.48	3.50	3.45
⁸⁷Sr/⁸⁶Sr		*0.70312*	*0.70299*	*0.70321*	*0.70305*
2σ.10⁻⁶		*5.00*	*5.00*	*5.00*	*4.00*
¹⁴³Nd/¹⁴⁴Nd		*0.512891*	*0.512927*	*0.512867*	*0.512862*
2σ.10⁻⁶		*4.00*	*4.00*	*4.00*	*3.00*
¹⁴⁵Sm/¹⁴⁴Sm		*0.348404*	*0.348413*	*0.348415*	*0.348407*
2σ.10⁻⁶	*3.00*	*3.00*	*3.00*	*2.00*
⁸⁷Rb/⁸⁶Rb		*0.133446*	*0.109633*	*0.109929*	*0.134577*
¹⁴⁷Sm/¹⁴⁴Sm	*0.110572*	*0.112502*	*0.110136*	*0.102566*
(⁸⁷Sr/⁸⁶Sr)Ma(¹⁴³Nd/¹⁴⁴Nd)Ma		*0.7031160.512888*	*0.7029870.512924*	*0.7032060.512864*	*0.7030510.512859*
¹⁴⁷Sm/¹⁴⁴Sm		*0.110572*	*0.112502*	*0.110136*	*0.102566*
εNdi	*5.11*	*5.81*	*4.64*	*4.54*

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