Table 1. LA-ICP-MS U-Pb results.														
									 						 			
Sample GCH-03-8	Isotopic ratios and 2s (%) errors	Ages and 2s absolute errors (Ma)	Reported Age	
			 	 	 	 	 	 	 	 	 	 	 	 	 			
Anal. #	i.s. [s]	Th/U	206Pb/238U	±2s	207Pb/235U	±2s 	207Pb/206Pb	±2s	206Pb/238U	±2s 	207Pb/235U	±2s 	207Pb/206Pb	±2s	Age (Ma)	±2s	 disc %	
			 					 	 					 				
jl12a06	38.3	0.72	0.0514	0.54	0.3683	1.08	0.05199	1.09	323	3	318	6	284	48	322	3	-13.73	
jl12a10	39.6	0.79	0.0689	0.67	0.5051	2.09	0.05317	2.17	429	6	415	14	336	98	428	5	-27.68	
jl12a28	20.4	0.04	0.0548	2.44	0.4219	5.24	0.05589	6.11	344	16	357	32	446	272	346	15	22.87	
jl12a11	42.1	0.41	0.1350	1.11	1.2345	1.71	0.06632	1.68	816	17	816	19	816	70	816	15	0.00	
jl12a26	24.2	0.23	0.1625	0.68	1.6962	0.85	0.07571	0.56	971	12	1007	11	1086	22	1086	22	10.59	
jl14a08	30.7	0.30	0.1877	1.05	1.9795	1.93	0.07649	2.01	1109	21	1109	26	1106	80	1109	18	-0.27	
jl12c12	39.6	0.37	0.1907	0.69	2.0256	1.06	0.07701	1.30	1125	14	1124	14	1120	52	1125	10	-0.45	
jl12a25	31.9	0.47	0.1667	0.65	1.7964	0.74	0.07815	0.74	994	12	1044	10	1150	30	1150	30	13.57	
jl12a16	29.4	0.51	0.1877	0.52	2.0285	0.67	0.07838	0.69	1109	11	1125	9	1156	28	1156	28	4.07	
jl12a13	34.4	0.39	0.2037	0.57	2.2012	0.59	0.07836	0.61	1195	12	1181	8	1156	26	1156	26	-3.37	
jl12a30	33.2	0.38	0.1759	0.39	1.9066	0.88	0.07862	0.82	1044	7	1083	12	1162	32	1162	32	10.15	
jl14a06	32.0	0.27	0.1927	0.55	2.1072	0.69	0.07930	0.42	1136	11	1151	9	1178	16	1178	16	3.57	
jl12a08	28.1	0.43	0.1563	0.88	1.7221	1.38	0.07991	1.33	936	15	1017	18	1194	52	1194	52	21.61	
jl12a07	25.6	0.35	0.1931	0.45	2.1334	0.63	0.08012	0.69	1138	9	1160	9	1198	26	1198	26	5.01	
jl12a29	24.2	0.39	0.1804	1.06	2.0022	1.47	0.08051	1.67	1069	21	1116	20	1208	66	1208	66	11.51	
jl12a12	37.1	0.34	0.2173	0.41	2.4691	0.65	0.08239	0.54	1268	9	1263	9	1254	20	1265	8	-1.12	
jl12a27	23.0	0.35	0.2303	0.72	2.9458	0.69	0.09278	0.96	1336	17	1394	10	1482	36	1482	36	9.85	
jl12a09	26.8	0.23	0.2783	0.61	3.6654	0.88	0.09549	0.74	1583	17	1564	14	1536	28	1536	28	-3.06	
jl12a15	34.5	0.40	0.2708	0.33	3.7145	0.48	0.09946	0.41	1545	9	1574	8	1612	14	1612	14	4.16	
jl12a14	28.1	0.58	0.2700	0.60	3.7956	1.00	0.10193	0.87	1541	16	1592	16	1658	32	1658	32	7.06	
																		
i.s.= signal interval integrated for isotope-ratio and age calculation (in seconds)										
disc%= percent discordance calculated from 207Pb/206Pb and 206Pb/238U ages (negative values: reversely discordant analyses)