Table 1 Representative electron microprobe analyses of minerals from various rock constituents of the Sandaogou alkaline complex  
Mineral	Amphibole									
Rock type	M	M	M	M	M	M	M	M	M	M	M	
Sample	JN07-8						JN07-9					
SiO2	39.23	39.18	38.51	39.59	39.58	39.35	41.50	41.20	41.50	40.92	40.80	
TiO2	0.87	0.85	0.78	0.72	0.63	0.83	0.77	0.82	0.78	0.80	0.78	
Al2O3	10.86	11.29	11.43	11.05	11.56	11.42	10.33	10.50	10.61	10.48	10.46	
Cr2O3	0.05		0.27		0.01	0.02		0.01		0.04		
FeO	23.94	24.55	24.64	24.74	24.59	23.81	23.19	22.61	22.44	22.18	22.69	
MnO	0.57	0.52	0.60	0.45	0.52	0.54	0.61	0.62	0.63	0.51	0.58	
MgO	6.70	6.05	5.88	6.04	6.07	6.22	7.03	7.18	7.26	7.25	7.15	
CaO	11.46	11.42	11.31	11.18	11.41	11.26	11.36	11.53	11.50	11.41	11.50	
Na2O	1.65	1.80	1.79	1.70	1.63	1.76	1.75	1.69	1.72	1.66	1.63	
K2O	1.67	1.88	1.81	1.64	1.67	1.90	1.44	1.43	1.46	1.38	1.41	
Total	97.01	97.53	97.02	97.11	97.67	97.10	97.97	97.58	97.89	96.64	97.00	
	Cation proportions calculated on a basis of 23 oxygens				
Si	6.129	6.13	6.058	6.185	6.145	6.158	6.375	6.351	6.369	6.357	6.327	
AlIV	1.871	1.87	1.942	1.815	1.855	1.842	1.625	1.649	1.631	1.643	1.673	
Sum T	8	8	8	8	8	8	8	8	8	8	8	
AlVI	0.127	0.21	0.175	0.218	0.259	0.262	0.243	0.258	0.287	0.273	0.238	
Ti	0.102	0.099	0.092	0.084	0.074	0.098	0.088	0.095	0.09	0.093	0.091	
Fe3+	0.863	0.709	0.829	0.845	0.831	0.693	0.664	0.604	0.585	0.606	0.662	
Mg	1.56	1.41	1.379	1.406	1.406	1.451	1.609	1.65	1.661	1.68	1.653	
Fe2+	2.265	2.503	2.412	2.387	2.362	2.423	2.316	2.311	2.296	2.275	2.28	
Mn	0.076	0.068	0.08	0.06	0.069	0.071	0.08	0.081	0.082	0.067	0.076	
Sum C	5	5	5	5	5	5	5	5	5	5	5	
Mn	0	0	0	0	0	0	0	0	0	0	0	
Ca	1.918	1.915	1.906	1.871	1.898	1.888	1.87	1.905	1.891	1.899	1.911	
Na	0.082	0.085	0.094	0.129	0.102	0.112	0.13	0.095	0.109	0.101	0.089	
Sum B	2	2	2	2	2	2	2	2	2	2	2	
Na	0.419	0.461	0.452	0.385	0.389	0.422	0.391	0.409	0.403	0.4	0.402	
K	0.333	0.376	0.363	0.327	0.33	0.379	0.282	0.282	0.285	0.272	0.279	
Sum A	0.752	0.837	0.815	0.712	0.719	0.801	0.672	0.691	0.688	0.673	0.681	
Total	15.752	15.837	15.815	15.712	15.719	15.801	15.672	15.691	15.688	15.673	15.681	
Mg-no	33.3	30.5	29.8	30.3	30.6	31.8	35.1	36.1	36.6	36.8	36.0	

Mineral	Pyroxene 																	
Rock type	PS					PS					PS					PS				
Sample	JN07-25					JN07-26					JN07-53					JN08-1				
SiO2	51.91	52.11	52.43	52.32	52.46	51.34	51.93	52.40	50.80	50.86	49.4	49.9	50.2	50.4	49.4	50.8	50.8	50.9	50.4	
TiO2	0.11	0.17	0.10	0.10	0.20	0.11	0.10	0.07	0.17	0.11	0.11	0.09	0.15	0.17	0.01	0.01	0.2	0.25	0.2	
Al2O3	1.00	0.98	0.99	0.99	0.98	0.99	1.08	1.32	1.08	1.09	1.26	1.28	1.09	1.16	0.5	1.33	1.09	1.01	1.05	
FeO	14.56	13.79	15.40	14.86	14.59	15.61	14.29	14.08	15.29	15.09	16.6	16.7	16.3	16.3	15.5	15.5	15.7	15.4	15.9	
MnO	0.60	0.54	0.55	0.51	0.50	0.61	0.48	0.57	0.59	0.50	0.63	0.61	0.59	0.58	0.87	0.57	0.48	0.46	0.5	
MgO	8.43	9.31	8.33	8.58	8.78	8.00	8.89	8.79	8.57	8.56	8.56	8.54	8.65	8.64	9.06	9.18	9.17	9.52	9.29	
CaO	18.89	19.47	18.56	18.86	18.98	17.99	19.20	19.44	18.77	18.77	20.4	20.1	19.6	20	21	18.4	18.4	18.9	18.5	
Na2O	3.23	2.75	3.33	3.30	3.03	3.52	3.17	2.89	3.27	3.24	2.11	2.07	2.49	2.4	1.58	3.41	3.43	3.07	3.37	
Total	98.76	99.15	99.72	99.56	99.57	98.17	99.14	99.55	98.54	98.22	99.11	99.29	99.26	99.66	98.01	99.21	99.31	99.6	99.3	
	Cation proportions calculated on a basis of 6 oxygens									
Si	1.978	1.976	1.982	1.977	1.985	1.971	1.967	1.981	1.94	1.948	1.898	1.915	1.92	1.92	1.921	1.92	1.92	1.921	1.906	
Ti	0.003	0.005	0.003	0.003	0.006	0.003	0.003	0.002	0.005	0.003	0.003	0.003	0.004	0.005	0	0	0.006	0.007	0.006	
Al	0.045	0.043	0.044	0.045	0.044	0.045	0.048	0.059	0.049	0.049	0.057	0.058	0.049	0.052	0.023	0.059	0.049	0.045	0.047	
Fe3+	0.232	0.198	0.23	0.236	0.196	0.269	0.245	0.187	0.292	0.286	0.252	0.234	0.25	0.247	0.2	0.329	0.319	0.288	0.328	
Fe2+	0.232	0.24	0.257	0.233	0.265	0.233	0.208	0.259	0.185	0.195	0.236	0.275	0.24	0.244	0.247	0.14	0.145	0.163	0.127	
Mn	0.019	0.017	0.018	0.016	0.016	0.02	0.015	0.018	0.019	0.016	0.02	0.02	0.019	0.019	0.029	0.018	0.015	0.015	0.016	
Mg	0.479	0.526	0.469	0.484	0.495	0.458	0.502	0.495	0.488	0.489	0.49	0.489	0.493	0.491	0.525	0.517	0.517	0.535	0.524	
Ca	0.771	0.791	0.752	0.763	0.769	0.74	0.779	0.787	0.768	0.77	0.84	0.826	0.803	0.816	0.875	0.745	0.745	0.764	0.75	
Na	0.239	0.202	0.244	0.241	0.222	0.262	0.233	0.212	0.242	0.241	0.157	0.154	0.185	0.177	0.119	0.25	0.251	0.225	0.247	
Total 	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	
En	24.3	26.6	23.8	24.5	25.2	23.1	25.3	25.3	24.3	24.5	24.5	24.5	24.7	24.6	26.3	25.9	25.9	26.9	26.3	
Fs	24.6	23.1	25.7	24.7	24.4	26.3	23.6	23.7	25.3	25.0	25.5	26.4	25.8	25.6	24.1	24.4	24.1	23.5	23.7	
Wo	39.1	40.1	38.2	38.6	39.1	37.4	39.3	40.2	38.3	38.5	42.1	41.4	40.2	40.9	43.8	37.3	37.4	38.4	37.6	
Ac	12.1	10.2	12.4	12.2	11.3	13.2	11.8	10.8	12.1	12.1	7.9	7.7	9.3	8.9	6.0	12.5	12.6	11.3	12.4	
Mg-no	50.8	54.6	49.1	50.7	51.8	47.8	52.6	52.7	50.0	50.3	47.9	47.7	48.6	48.6	51.0	51.4	51.0	52.4	51.0	

	K-feldspar													e 						
Rock type 	M			M			QS			QS			PS			PS		PS	PS	
Sample	JN07-8			JN07-9			JN07-18			JN07-19			JN07-25			JN07-26		JN07-52	JN08-1	
SiO2	63.49	63.50	64.10	64.45	63.75	63.92	63.1	62.6	62.9	63.3	63.2	62.7	63.88	64.19	64.23	63.62	64.06	63.1	62.7	
TiO2	0.05	0.07	0.06	0.001	0.03	0.00	0	0	0.02	0.05	0.04	0.1	0.08	0.061	0.06	0.07	0.07	0	0	
Al2O3	19.13	19.11	19.22	19.05	19.20	19.06	19.1	19.1	19	19.2	18.8	19	18.93	18.964	18.91	18.89	18.94	18.7	18.8	
FeO	0.08	0.14	0.06	0.08	0.08	0.05	0.07	0.06	0.09	0.1	0.08	0.05	0.12	0.153	0.12	0.16	0.14	0.11	0.15	
MnO	0.02	0.01		0.04	0.04	0.03	0	0	0.02	0	0.03	0.03	0.05	0.039	0.05	0.01	0.01	0	0	
MgO		0.00		0.01		0.01	0	0	0	0	0.01	0.03	0.02	0.025	0.01	0.01	0.00	0	0	
CaO	0	0	0	0.03	0.00	0.00	0	0.02	0.02	0.03	0	0	0.03	0.047	0.02	0.03	0.02	0	0.01	
Na2O	0.62	0.73	1.22	0.68	0.88	0.75	1.2	1.35	0.75	1.04	0.65	1.43	0.37		0.45	0.38	0.48	0.61	0.76	
K2O	15.75	15.52	14.89	15.67	15.30	15.57	14.4	14.6	15.2	14.5	15.1	14.2	16.24	15.83	15.88	15.98	15.83	15.8	15.5	
Total	99.13	99.07	99.55	100.00	99.27	99.37	98.4	98.31	98.4	99.01	98.7	98.23	99.70	99.31	99.72	99.14	99.55	98.82	98.21	
Cation proportions calculated on a basis of 32 oxygens	
Si	11.839	11.84	11.857	11.895	11.846	11.874	11.837	11.791	11.832	11.824	11.87	11.804	11.867	11.918	11.899	11.871	11.889	11.862	11.836	
Ti	0.007	0.009	0.008	0	0.004	0	0	0	0.003	0.007	0.006	0.014	0.011	0.009	0.009	0.009	0.009	0	0	
Al	4.201	4.197	4.186	4.14	4.202	4.169	4.219	4.237	4.209	4.224	4.158	4.213	4.14	4.146	4.126	4.152	4.14	4.14	4.179	
Fe	0.012	0.021	0.009	0.013	0.012	0.007	0.011	0.009	0.014	0.016	0.013	0.008	0.018	0.024	0.018	0.025	0.022	0.017	0.024	
Mn	0.003	0.001	0	0.007	0.006	0.004	0	0	0.003	0	0.005	0.005	0.008	0.006	0.008	0.001	0.001	0	0	
Mg	0	0.001	0	0.001	0	0.002	0	0	0	0	0.003	0.008	0.004	0.007	0.004	0.003	0	0	0	
Ca	0	0	0	0.006	0	0	0	0.004	0.004	0.006	0	0	0.005	0.009	0.003	0.007	0.004	0	0.002	
Na	0.224	0.263	0.438	0.242	0.317	0.269	0.436	0.493	0.274	0.377	0.237	0.522	0.134	0	0.161	0.137	0.171	0.222	0.278	
K	3.747	3.691	3.514	3.689	3.628	3.689	3.446	3.508	3.648	3.455	3.618	3.411	3.848	3.75	3.753	3.805	3.748	3.789	3.733	
Or	94.4	93.3	88.9	93.7	92	93.2	88.8	87.6	92.9	90	93.9	86.7	96.5	99.8	95.8	96.4	95.5	94.5	93	
Ab	5.6	6.7	11.1	6.1	8	6.8	11.2	12.3	7	9.8	6.1	13.3	3.4	0	4.1	3.5	4.4	5.5	6.9	
An	0	0	0	0.2	0	0	0	0.1	0.1	0.2	0	0	0.1	0.2	0.1	0.2	0.1	0	0	

	Plagioclase 																			
Rock type 	M			M			QS			QS			PS			PS		PS	PS	
Sample	JN07-8			JN07-9			JN07-18			JN07-19			JN07-25			JN07-26		JN07-52	JN08-1	
SiO2	66.29	65.93	62.60	64.11	64.71	63.89	67.01	66.7	66.2	66.8	66.2	66.4	68.49	67.95	67.70	67.84	67.10	66.2	67.2	
TiO2	0.04	0.01	0.02		0.02		0	0.01	0.04	0	0.01	0.06	0.04	0.04	0.02	0.01		0	0.01	
Al2O3	20.85	21.07	23.42	22.76	22.39	22.98	20.10	19.8	20.2	20.4	20.4	20.2	20.00	19.98	20.01	20.17	20.21	19.9	19.9	
FeO	0.30	0.38	0.21	0.19	0.18	0.16	0.07	0.03	0.1	0.03	0.02	0.08	0.12	0.09	0.16	0.13	0.13	0.11	0.06	
MnO	0.06	0.03	0.00	0.02	0.05	0.01	0	0.03	0	0.02	0	0	0.03	0.07	0.02	0.00	0.03	0	0.05	
MgO	0.01	0.01	0.00	0.01			0.01	0	0	0.01	0	0	0.01	0.01		0.00	0.00	0	0	
CaO	0.78	1.09	3.53	3.03	2.35	3.32	0.16	0.23	0.4	0.26	0.4	0.47	0.08	0.14	0.10	0.07	0.09	0.1	0.02	
Na2O	11.51	11.43	9.61	10.04	10.48	9.84	12.2	12.4	12	12.1	12	12.1	11.69	11.82	11.82	11.96	11.56	12.4	12.6	
K2O	0.11	0.12	0.17	0.15	0.17	0.14	0.07	0.11	0.08	0.13	0.12	0.15	0.19	0.17	0.16	0.08	0.22	0.12	0.08	
Total	99.93	100.08	99.57	100.30	100.34	100.34	99.68	99.34	99.03	99.84	99.28	99.46	100.64	100.28	99.97	100.26	99.34	98.83	99.93	
Cation proportions calculated on a basis of 32 oxygens	
Si	11.664	11.604	11.127	11.288	11.377	11.249	11.801	11.804	11.744	11.754	11.724	11.739	11.906	11.872	11.863	11.851	11.83	11.776	11.816	
Ti	0.005	0.001	0.002	0	0.002	0	0	0.001	0.005	0	0.001	0.008	0.005	0.005	0.002	0.002	0	0	0.001	
Al	4.32	4.366	4.902	4.72	4.635	4.765	4.169	4.126	4.22	4.227	4.255	4.206	4.094	4.11	4.129	4.148	4.197	4.169	4.121	
Fe	0.044	0.056	0.032	0.028	0.026	0.024	0.01	0.004	0.015	0.004	0.003	0.012	0.017	0.013	0.023	0.019	0.019	0.016	0.009	
Mn	0.009	0.005	0	0.003	0.007	0.001	0	0.004	0	0.003	0	0	0.005	0.011	0.003	0	0.004	0	0.007	
Mg	0.002	0.004	0.001	0.004	0	0	0.003	0	0	0.003	0	0	0.003	0.003	0	0.001	0	0	0	
Ca	0.146	0.206	0.673	0.572	0.443	0.625	0.03	0.044	0.076	0.049	0.076	0.089	0.015	0.026	0.018	0.013	0.017	0.019	0.004	
Na	3.927	3.9	3.313	3.429	3.574	3.36	4.166	4.255	4.128	4.128	4.121	4.148	3.94	4.005	4.015	4.051	3.95	4.277	4.296	
K	0.025	0.027	0.039	0.033	0.038	0.032	0.016	0.025	0.018	0.029	0.027	0.034	0.042	0.039	0.036	0.017	0.049	0.027	0.018	
Or	0.6	0.7	1	0.8	0.9	0.8	0.4	0.6	0.4	0.7	0.6	0.8	1.1	1	0.9	0.4	1.2	0.6	0.4	
Ab	95.8	94.4	82.3	85	88.1	83.6	98.9	98.4	97.8	98.1	97.6	97.1	98.6	98.4	98.7	99.3	98.4	98.9	99.5	
An	3.6	5	16.7	14.2	10.9	15.6	0.7	1	1.8	1.2	1.8	2.1	0.4	0.6	0.4	0.3	0.4	0.4	0.1	

Garnet 							
Rock type	QS			QS			
Sample	JN07-18			JN07-19			
SiO2	34.9	34.9	35.2	36.3	35.5	36	
TiO2	1.29	1.22	0.59	0.41	0.73	0.36	
Al2O3	3.06	3.07	2.63	3.66	3.31	3.76	
FeO	28.3	27.3	29.2	28.7	28.1	28.6	
MnO	1.14	0.54	1.29	1.13	0.99	0.9	
MgO	0.07	0.08	0.09	0.04	0.08	0.12	
CaO	29.9	31.5	30.5	29.9	30.5	30.1	
Na2O	0	0.02	0.04	0.01	0.05	0.02	
Total	98.66	98.64	99.54	100.15	99.26	99.87	
Cation proportions calculated on a basis of 12 oxygens	
Si	2.901	2.889	2.899	2.963	2.922	2.943	
Al	0.299	0.299	0.255	0.351	0.321	0.362	
Ti	0.081	0.076	0.037	0.025	0.045	0.022	
Fe	1.967	1.89	2.011	1.959	1.935	1.955	
Mn	0.009	0.01	0.011	0.005	0.01	0.015	
Mg	0.08	0.038	0.09	0.078	0.069	0.062	
Ca	2.663	2.794	2.691	2.615	2.69	2.637	
Na	0	0.003	0.006	0.002	0.008	0.003	
Notes: QS, quartz syenite; M, Monzonite; PS, pyroxene syenite.