Different Origins of the Fractionation of Platinum-Group Elements in Raobazhai and Bixiling Mafic-Ultramafic Rocks from the Dabie Orogen, Central China

Table 1

Major elements (wt%), trace elements (ppm), and PGE (ppb) concentration of Raobazhai and Bixiling mafic-ultramafic rocks.

Location	Raobazhai mafic-ultramafic rocks					Bixiling mafic-ultramafic rocks
						Nattier blue eclogite			Greenish black eclogite		Garnet peridotite
Sample	L3102	L3103	L3105-1	L3105-2	L3106	L2906	L2907	L2912	L2908	L2909	L2910	L2911	L2911P
SiO2	46.81	47.99	46.23	45.64	44.72	50.65	50.66	46.88	42.96	42.97	42.11	38.34	38.42
TiO2	0.60	0.77	1.39	0.79	1.19	0.77	0.77	2.69	2.05	2.08	0.25	0.35	0.35
Al2O3	13.94	11.94	13.33	14.11	15.02	16.64	16.09	13.95	13.57	13.84	8.85	6.59	6.61
Fe2O3	12.99	11.21	12.35	12.87	14.82	9.31	9.34	18.83	20.89	20.63	14.3	15.76	15.91
MnO	11.00	11.53	10.45	10.83	9.46	0.15	0.15	0.24	0.14	0.14	0.2	0.21	0.2
MgO	0.23	0.18	0.20	0.21	0.28	7.47	7.76	5.49	7.08	7	24.65	28.78	28.71
CaO	11.72	12.20	12.04	11.48	11.50	11.92	12.01	9.26	12.02	11.99	5.33	3.08	3.07
Na2O	2.11	2.11	2.13	2.28	1.82	2.1	2.21	2.37	1.23	1.22	0.21	0.32	0.31
K2O	0.06	0.40	0.24	0.20	0.04	0.24	0.19	0.03	0.01	0.02	0.01	0.05	0.05
P2O5	0.05	0.01	0.09	0.08	0.08	0.05	0.08	0.15	0.02	0.01	0.04	0.13	0.13
LOI	0.48	1.55	1.05	1.16	0.38	0.39	0.17				3.56	4.79	4.89
Total	99.99	99.90	99.49	99.64	99.32	99.7	99.42	99.24	99.39	99.48	99.51	98.4	98.66
Sc	42	44	49	46	56	40	39	50	55	57	15	12	11
V	257	326	347	272	318	225	232	389	911	918	99	116	102
Cr	1744	1258	1112	995	851	400	661	1			2673	7448	7313
Co	45	46	55	56	46	41	42	45	93	82	118	146	142
Ni	185	224	223	240	99	72	79	6	12	10	802	1062	1012
Cu	14	145	53	96	82	97	97	177	63	62	80	29	27
Zn	51	60	75	75	61	53	55	109	88	94	80	101	97
Ga	11	12	14	12	12	14	13	18	18	18	6	7	6
Rb	1.8	14.1	9.6	6.4	4.5	6.1	4.3	1.5	0.4	0.6	0.4	1.4	1.4
Sr	110	195	201	161	107	345	230	70	75	66	89	122	123
Y	15	14	23	18	28	10	10	19	7	7	5	5	5
Zr	31	22	33	19	21	7	10	17	11	12	11	14	13
Nb	1.9	1.7	3.0	2.8	2.9	0.5	0.5			0.1	0.3	0.6	0.6
Cs	0.6	0.5	0.6	1.0	0.9	0.4	0.3	0.1		0.1	0.3	0.2	0.2
Ba	81	184	143	164	117	87	74	27	11	17	14	36	48
La	0.8	0.4	0.9	1.6	0.2	3.1	2.1	3.2	0.3	0.3	1.7	4.6	4.2
Ce	2.0	1.1	3.3	4.3	0.6	7.1	3.8	10.2	0.8	0.8	4.3	9.7	8.6
Pr	0.4	0.3	0.8	0.8	0.2	1.2	0.6	1.7	0.2	0.2	0.8	1.4	1.2
Nd	2.4	1.9	4.9	4.8	1.3	5.8	2.7	9.2	1.4	1.4	3.6	6	5.5
Sm	1.26	1.15	2.34	1.93	1.19	1.54	0.91	2.55	0.93	0.98	0.95	1.23	1.16
Eu	0.54	0.54	0.91	0.78	0.62	0.66	0.46	1.09	0.43	0.45	0.32	0.37	0.37
Gd	2.16	2.07	3.41	2.65	2.77	1.76	1.42	3.34	1.24	1.28	0.9	1.15	1.09
Tb	0.43	0.41	0.66	0.52	0.65	0.32	0.29	0.59	0.22	0.24	0.15	0.18	0.17
Dy	2.9	2.8	4.5	3.5	5.0	2.1	2.1	3.9	1.5	1.6	1	1.1	1
Ho	0.6	0.6	0.9	0.7	1.1	0.4	0.4	0.8	0.3	0.3	0.2	0.2	0.2
Er	1.7	1.7	2.8	2.2	3.5	1.3	1.3	2.2	0.9	0.9	0.6	0.6	0.6
Tm	0.2	0.2	0.4	0.3	0.6	0.2	0.2	0.3	0.1	0.1	0.1	0.1	0.1
Yb	1.6	1.5	2.7	2.3	3.7	1.2	1.2	2.1	0.8	0.8	0.6	0.6	0.6
Lu	0.25	0.24	0.43	0.34	0.57	0.18	0.19	0.31	0.12	0.12	0.1	0.09	0.1
Hf	0.92	0.83	1.19	0.64	0.78	0.24	0.31	0.54	0.43	0.47	0.29	0.41	0.39
Ta	0.209	0.08	0.14	0.17	0.147	0.031	0.029	0.002	0.001	0.003	0.021	0.037	0.086
Pb	7.4	12.2	23.0	13.9	20.8	2.7	0.9	9.7	2	1.3	2.5	7.7	7.8
Th	0.0	0.0	0.0	0.0	0.0	0.2	0.1	0.6	0.2	0.2	0.2	0.3	0.3
U	0.02	0.01	0.05	0.06	0.02	0.06	0.04	0.17	0.08	0.08	0.05	0.1	0.1
Ir	0.153	0.060	0.257	0.180	0.360	—	0.003	—	—	—	0.837	1.18	0.52
Ru	0.487	0.297	0.367	0.520	0.513	0.003	—	0.007	—	0.03	0.723	1.76	1.357
Rh	0.237	0.327	0.447	0.343	0.633	0.108	0.083	0.002	0.109	0.142	0.665	0.648	0.422
Pt	3.86	8.77	9.71	7.65	14.33	0.34	0.20	0.08	0.16	0.29	12.00	3.40	3.75
Pd	4.86	31.98	4.44	7.69	23.38	0.47	0.03	0.16	0.09	0.50	7.42	8.67	8.34

(—): lower than the limits of detection.