Supplementary data 5. Compositions (wt.%) of biotite from selected samples in the Xiaohekou complex
Rock type/sample No.	SiO2	TiO2	Al2O3	FeO	MnO	MgO	CaO	Na2O	K2O	Cr2O3	Total	
Pyroxenite/XH20-2	39.07	3.58	15.59	10.09	0.01	18.96	0.07	1.31	7.50	0.04	96.22	
	36.53	5.69	14.74	11.46	0.06	16.32	0.11	0.40	9.08	0.06	94.45	
	36.49	5.33	15.01	11.21	0.06	16.63	N.D.*	0.53	8.95	0.03	94.24	
Pyroxenite/06XH02-6	37.94	3.52	15.28	11.14	0.03	18.41	0.07	0.44	9.07	0.21	96.11	
Gabbronorite/06XH02-7	38.61	5.35	14.42	13.08	0.04	16.43	N.D.	0.14	9.37	0.30	97.74	
Gabbro/06XH01-2	38.43	4.36	15.00	14.41	0.09	15.36	0.00	0.24	9.37	N.D.	97.26	
	37.32	4.21	15.20	14.84	0.14	15.12	0.04	0.20	8.96	N.D.	96.03	
Gabbro/XH33-3	37.75	3.81	14.77	13.09	N.A.†	15.62	0.01	0.14	9.76	N.A.	94.94	
Hb gabbro pegmatite/XH24	38.22	5.44	13.78	11.23	0.06	17.29	N.D.	0.26	9.34	0.01	95.63	
	38.12	5.17	13.98	12.85	0.08	16.34	0.04	0.23	9.34	0.03	96.18	
Ol gabbronorite dyke/XH11-5	38.31	4.65	16.27	8.52	0.00	19.21	0.05	0.24	9.69	0.16	97.10	
Leucogabbro/XH44-5	37.09	5.33	14.07	14.45	N.A.	14.65	0.00	0.10	9.86	N.A.	95.55	
	37.56	4.68	14.37	11.20	N.A.	16.33	0.01	0.03	10.32	N.A.	94.48	
Leucogabbro/06XH03-1	38.11	3.28	15.30	11.34	N.A.	17.14	0.02	0.57	8.64	N.A.	94.40	
	38.05	3.02	15.16	10.76	N.A.	17.35	0.07	0.35	9.15	N.A.	93.91	
Leucogabbro/XH45-4	38.22	4.70	13.44	13.27	N.A.	15.22	0.04	0.10	9.84	N.A.	94.82	
	36.85	4.67	13.81	15.22	N.A.	13.92	0.02	0.11	9.58	N.A.	94.16	
	37.84	4.26	13.71	11.80	N.A.	15.76	0.02	0.07	10.12	N.A.	93.57	
	37.91	4.77	13.15	12.75	0.07	16.13	0.04	0.09	9.73	0.14	94.78	
Monzonite/XH32-2/Phenocryst	37.49	4.54	13.06	13.45	0.08	15.77	0.04	0.13	9.71	N.D.	94.27	
	38.27	4.52	13.28	13.18	0.04	16.03	N.D.	0.15	9.55	0.03	95.05	
Monzonite/XH32-2/Matrix	37.84	5.20	12.94	13.48	0.04	15.26	0.03	0.13	9.54	0.04	94.50	
Dioritic enclave in pyroxenite	36.37	4.02	15.88	11.36	N.A.	15.53	0.05	0.54	9.16	N.A.	92.89	
	38.43	4.92	14.47	13.43	0.09	15.34	0.02	0.21	9.45	0.02	96.38	
	38.53	4.24	14.23	13.19	0.02	16.04	N.D.	0.21	9.28	0.03	95.77	
Dioritic enclave in gabbro	37.53	4.40	14.58	13.81	N.A.	14.60	0.04	0.21	9.53	N.A.	94.69	
	37.43	4.43	14.28	14.71	N.A.	14.21	0.07	0.25	9.45	N.A.	94.83	
	36.75	5.06	14.30	14.77	N.A.	13.92	0.02	0.23	9.31	N.A.	94.36	
	37.02	4.69	14.00	14.73	N.A.	14.02	0.03	0.18	9.59	N.A.	94.26	
Dioritic enclave in leucogabbro	37.46	5.55	13.87	14.92	N.A.	13.61	0.07	0.05	9.84	N.A.	95.36	
	36.72	5.35	14.38	14.43	N.A.	14.01	0.04	0.02	9.71	N.A.	94.66	
#N.D. = not detected.
†N.A. = not analyzed.