Provenance of Late Triassic Xujiahe Formation in Huize Area, Upper Yangtze: Based on Heavy Mineral Analysis and Detrital Zircon U-Pb Dating

doi:10.19657/j.geoscience.1000-8527.2018.02.01

Abstract

Abstract:

The Late Triassic Xujiahe Formation in Huize area, Upper Yangtze consists of braided river and shallow lacustrine sandstones and mudstones. The direction of provenance restored by cross bedding mainly comes from the southeast. The heavy mineral assemblages of ilmenite, anatase, chromian spinel and magnetite indicate that they can be provided by magmatic rocks and part of mafic rocks. In this paper, the tourmaline and detrital zircon in Xujiahe sandstone are respectively tested and analyzed by electron microprobe analysis and detrital zircon LA-ICP-MS U-Pb dating. The chemical compositions of tourmaline are mainly dravite and schorl. They are mainly from metapelites and metapsammites, and a small amount of Li-poor granitoids and associated pegmatites and aplites. The detrital zircon U-Pb age spectrum shows that the source rocks of Xujiahe Formation mainly come from 257 to 362 Ma, 420 to 492 Ma, 782 to 876 Ma and 1,690 to 2,176 Ma rocks. The paleocurrent direction, heavy mineral assemblages, tourmaline electronic microprobe analysis and detrital zircon dating show that the source was mainly from the Dianqiangui Oldland. The 257 to 362 Ma source rocks are mainly Emeishan basalt and intrusive rocks; 420 to 492 Ma and 782 to 876 Ma ones are from granite and sandstones, and 1 690 to 2 176 Ma ones are from sandstones. Compared with the provenance of Feixianguan Formation, the source area of Xujiahe Formation is obviously different, which may be related to tectonic movement. Detrital zircon dating indicates that there existed Paleoproterozoic magmatism and Neoarchean crystalline basement. These data provide sedimentological evidence for tectonic evolution of the Upper Yangtze.

Key words: Upper Yangtze, Xujiahe Formation, detrital heavy mineral, tourmaline electron microprobe, detrital zircon U-Pb dating

CLC Number:

ZHANG Yingli, WANG Zongqi, JIA Xiaotong, CHEN Muyin. Provenance of Late Triassic Xujiahe Formation in Huize Area, Upper Yangtze: Based on Heavy Mineral Analysis and Detrital Zircon U-Pb Dating[J]. Geoscience, 2018, 32(02): 213-226.

Figures/Tables 12

Fig.1 Tectonic units division (a) and simplified geological map of Huize area (b)

Fig.2 Measured stratigraphic section of the Xujiahe Formation in Huize area

Fig. 3 Typical photographs of the Xujiahe Formation

Table 1 Heavy mineral composition (%) of Xujiahe Formation HLS15 sandstone in the Huize area of Upper Yangtze

重矿物/%
锆石	磷灰石	锐钛矿	金红石	钛铁矿	黄铁矿	电气石	铬尖晶石	赤-褐铁矿	独居石	磁铁矿	其他
38.3	6.16	0.22	6.09	14.08	0.16	29.54	1.04	0.12	3	0.25	1.04

Fig.4 Features of detrital tourmaline of Xujiahe Formation HLS15 in the Huize area, photomicrographs ((a) and (b)) of representative tourmalines showing diverse shape, roundness and colors, and BSE images ((c) and (d)) showing chemical compositions of tourmaline grains

Fig.5 Major element chemical composition of detrital tourmalines in the Xvacancy-Ca-(Na+K) ternary diagram and Xvacancy/(Xvacancy+Na+K) vs. Mg/(Mg+Fe) diagram illustrating tourmaline species (according to Henry et al. [47], 2011)

Table 2 Representative chemical composition of the detrital tourmalines HLS15 from the Xujiahe Formation sandstone

点号	SiO₂	TiO₂	Al₂O₃	FeO	MgO	CaO	MnO	Na₂O	K₂O	H₂O^*	B₂ $O 3 *$	Li₂O^*	Total	Si	Ti	Al	Fe²⁺	Mg	Mn	Li^+*	Ca	Na	K	Xvacancy
1	34.55	0.85	33.84	9.92	3.51	0.57	0.02	1.97	0.07	3.6	10.44	0.35	99.69	5.75	0.11	6.64	1.38	0.87	0.00	0.23	0.10	0.64	0.02	0.24
2	34.55	0.94	33.52	13.09	1.06	0.26	-	2.12	0.06	3.56	10.33	0.46	99.95	5.81	0.12	6.65	1.84	0.27	0.00	0.31	0.05	0.69	0.01	0.25
3	35.43	0.47	24.79	11.89	9.94	2.90	0.13	1.67	0.07	3.55	10.29	0.00	101.13	5.98	0.06	4.93	1.68	2.50	0.02	0.00	0.53	0.55	0.02	0.00
4	34.68	0.82	32.64	12.52	2.56	0.80	0.11	2.08	0.08	3.59	10.39	0.33	100.60	5.80	0.10	6.43	1.75	0.64	0.02	0.23	0.14	0.67	0.02	0.17
5	34.92	0.78	33.56	9.70	4.13	0.73	0.08	2.13	0.01	3.63	10.51	0.33	100.51	5.77	0.10	6.54	1.34	1.02	0.01	0.22	0.13	0.68	0.00	0.19
6	35.72	0.23	31.68	7.07	7.12	0.87	0.06	2.64	0.04	3.64	10.54	0.27	99.88	5.89	0.03	6.16	0.98	1.75	0.01	0.18	0.15	0.84	0.01	0.00
7	36.08	0.46	29.57	8.02	8.01	0.76	0.05	3.08	0.09	3.63	10.52	0.16	100.43	5.96	0.06	5.76	1.11	1.97	0.01	0.11	0.14	0.99	0.02	0.00
8	35.44	0.18	30.02	7.36	8.40	1.46	0.07	2.11	0.05	3.59	10.41	0.02	99.11	5.92	0.02	5.91	1.03	2.09	0.01	0.01	0.26	0.68	0.01	0.05
9	34.19	0.45	31.84	15.51	1.58	0.31	0.29	2.79	0.05	3.54	10.25	0.18	100.98	5.80	0.06	6.36	2.20	0.40	0.04	0.12	0.06	0.92	0.01	0.02
10	34.64	0.45	33.37	13.76	1.19	0.25	0.16	2.28	0.06	3.57	10.34	0.35	100.42	5.82	0.06	6.61	1.94	0.30	0.02	0.24	0.05	0.74	0.01	0.20
11	35.22	0.35	25.34	10.48	9.86	2.44	0.13	1.88	0.08	3.53	10.22	0.00	99.53	5.99	0.05	5.08	1.49	2.50	0.02	0.00	0.45	0.62	0.02	0.00
12	35.23	0.70	32.73	10.07	3.80	0.58	0.00	2.64	0.11	3.62	10.49	0.51	100.48	5.84	0.09	6.39	1.40	0.94	0.00	0.34	0.10	0.85	0.02	0.01
13	33.53	0.74	31.49	16.02	0.85	0.68	0.04	2.62	0.10	3.49	10.13	0.34	100.03	5.75	0.10	6.37	2.30	0.22	0.01	0.24	0.13	0.87	0.02	0.00
14	35.75	0.98	33.73	7.91	4.66	0.55	0.05	2.24	0.02	3.67	10.65	0.47	100.68	5.83	0.12	6.49	1.08	1.13	0.01	0.31	0.10	0.71	0.00	0.19
15	34.74	0.19	31.88	10.63	5.08	0.94	0.08	2.34	0.06	3.59	10.4	0.16	100.09	5.81	0.02	6.28	1.49	1.27	0.01	0.11	0.17	0.76	0.01	0.04
16	36.14	0.48	33.08	7.07	5.33	0.27	0.12	2.53	0.00	3.65	10.59	0.45	99.71	5.93	0.06	6.40	0.97	1.30	0.02	0.29	0.05	0.81	0.00	0.15
17	36.55	0.76	34.11	6.28	6.00	0.46	0.11	2.36	0.09	3.74	10.83	0.45	101.74	5.86	0.09	6.45	0.84	1.44	0.02	0.29	0.08	0.73	0.02	0.16
18	35.64	1.06	33.04	8.52	5.15	0.74	0.02	2.3	0.04	3.68	10.66	0.4	101.25	5.81	0.13	6.35	1.16	1.25	0.00	0.26	0.13	0.73	0.01	0.13

Table 2 Representative chemical composition of the detrital tourmalines HLS15 from the Xujiahe Formation sandstone

点号	SiO₂	TiO₂	Al₂O₃	FeO	MgO	CaO	MnO	Na₂O	K₂O	H₂O^*	B₂ $O 3 *$	Li₂O^*	Total	Si	Ti	Al	Fe²⁺	Mg	Mn	Li^+*	Ca	Na	K	Xvacancy
1	34.55	0.85	33.84	9.92	3.51	0.57	0.02	1.97	0.07	3.6	10.44	0.35	99.69	5.75	0.11	6.64	1.38	0.87	0.00	0.23	0.10	0.64	0.02	0.24
2	34.55	0.94	33.52	13.09	1.06	0.26	-	2.12	0.06	3.56	10.33	0.46	99.95	5.81	0.12	6.65	1.84	0.27	0.00	0.31	0.05	0.69	0.01	0.25
3	35.43	0.47	24.79	11.89	9.94	2.90	0.13	1.67	0.07	3.55	10.29	0.00	101.13	5.98	0.06	4.93	1.68	2.50	0.02	0.00	0.53	0.55	0.02	0.00
4	34.68	0.82	32.64	12.52	2.56	0.80	0.11	2.08	0.08	3.59	10.39	0.33	100.60	5.80	0.10	6.43	1.75	0.64	0.02	0.23	0.14	0.67	0.02	0.17
5	34.92	0.78	33.56	9.70	4.13	0.73	0.08	2.13	0.01	3.63	10.51	0.33	100.51	5.77	0.10	6.54	1.34	1.02	0.01	0.22	0.13	0.68	0.00	0.19
6	35.72	0.23	31.68	7.07	7.12	0.87	0.06	2.64	0.04	3.64	10.54	0.27	99.88	5.89	0.03	6.16	0.98	1.75	0.01	0.18	0.15	0.84	0.01	0.00
7	36.08	0.46	29.57	8.02	8.01	0.76	0.05	3.08	0.09	3.63	10.52	0.16	100.43	5.96	0.06	5.76	1.11	1.97	0.01	0.11	0.14	0.99	0.02	0.00
8	35.44	0.18	30.02	7.36	8.40	1.46	0.07	2.11	0.05	3.59	10.41	0.02	99.11	5.92	0.02	5.91	1.03	2.09	0.01	0.01	0.26	0.68	0.01	0.05
9	34.19	0.45	31.84	15.51	1.58	0.31	0.29	2.79	0.05	3.54	10.25	0.18	100.98	5.80	0.06	6.36	2.20	0.40	0.04	0.12	0.06	0.92	0.01	0.02
10	34.64	0.45	33.37	13.76	1.19	0.25	0.16	2.28	0.06	3.57	10.34	0.35	100.42	5.82	0.06	6.61	1.94	0.30	0.02	0.24	0.05	0.74	0.01	0.20
11	35.22	0.35	25.34	10.48	9.86	2.44	0.13	1.88	0.08	3.53	10.22	0.00	99.53	5.99	0.05	5.08	1.49	2.50	0.02	0.00	0.45	0.62	0.02	0.00
12	35.23	0.70	32.73	10.07	3.80	0.58	0.00	2.64	0.11	3.62	10.49	0.51	100.48	5.84	0.09	6.39	1.40	0.94	0.00	0.34	0.10	0.85	0.02	0.01
13	33.53	0.74	31.49	16.02	0.85	0.68	0.04	2.62	0.10	3.49	10.13	0.34	100.03	5.75	0.10	6.37	2.30	0.22	0.01	0.24	0.13	0.87	0.02	0.00
14	35.75	0.98	33.73	7.91	4.66	0.55	0.05	2.24	0.02	3.67	10.65	0.47	100.68	5.83	0.12	6.49	1.08	1.13	0.01	0.31	0.10	0.71	0.00	0.19
15	34.74	0.19	31.88	10.63	5.08	0.94	0.08	2.34	0.06	3.59	10.4	0.16	100.09	5.81	0.02	6.28	1.49	1.27	0.01	0.11	0.17	0.76	0.01	0.04
16	36.14	0.48	33.08	7.07	5.33	0.27	0.12	2.53	0.00	3.65	10.59	0.45	99.71	5.93	0.06	6.40	0.97	1.30	0.02	0.29	0.05	0.81	0.00	0.15
17	36.55	0.76	34.11	6.28	6.00	0.46	0.11	2.36	0.09	3.74	10.83	0.45	101.74	5.86	0.09	6.45	0.84	1.44	0.02	0.29	0.08	0.73	0.02	0.16
18	35.64	1.06	33.04	8.52	5.15	0.74	0.02	2.3	0.04	3.68	10.66	0.4	101.25	5.81	0.13	6.35	1.16	1.25	0.00	0.26	0.13	0.73	0.01	0.13

Fig.6 Composition of detrital tourmaline from Huize area plotted on the ternary classification diagrams of Henry and Guidotti[48]

Table 3 Detrital zircon U-Pb isotopic data from the Xujiahe Formation in Huize area

点号	元素含量/10^-6			Th/U	同位素比值及误差						同位素年龄及误差/Ma
	Pb	Th	U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
	Pb	Th	U		比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ
2	7	35	43	0.81	0.075 7	0.004 6	1.448 3	0.123 7	0.142 5	0.004 0	1 087	117	909	51	859	23
3	86	117	196	0.59	0.125 1	0.001 7	6.678 8	0.163 8	0.385 6	0.005 2	2 030	23	2 070	22	2 103	24
4	19	49	48	1.01	0.109 3	0.002 4	4.855 2	0.172 0	0.323 8	0.005 5	1 787	37	1 795	30	1 808	27
5	12	83	144	0.57	0.058 5	0.002 1	0.626 5	0.032 6	0.079 0	0.001 4	547	76	494	20	490	9
6	11	63	135	0.47	0.059 8	0.003 3	0.604 2	0.043 9	0.074 4	0.001 5	595	114	480	28	463	9
7	16	109	101	1.08	0.065 9	0.002 6	1.174 4	0.065 6	0.129 0	0.002 5	804	78	789	31	782	14
8	27	62	59	1.05	0.124 2	0.002 6	6.312 2	0.220 5	0.370 1	0.006 4	2 018	35	2 020	31	2 030	30
9	27	55	55	0.99	0.136 0	0.002 6	7.573 0	0.255 6	0.404 9	0.007 5	2 176	31	2 182	30	2 192	35
10	129	186	341	0.55	0.117 1	0.001 8	5.570 4	0.148 5	0.343 8	0.004 9	1 912	26	1 912	23	1 905	23
11	36	54	55	0.98	0.164 1	0.003 2	11.888 2	0.389 4	0.524 2	0.008 6	2 499	31	2 596	31	2 717	36
12	29	53	68	0.77	0.124 9	0.002 6	6.292 6	0.214 6	0.365 9	0.006 0	2 027	35	2 017	30	2 010	28
13	17	109	99	1.09	0.074 7	0.003 1	1.388 9	0.081 8	0.136 3	0.002 7	1 061	80	884	35	823	15
16	81	178	180	0.99	0.122 0	0.002 5	6.154 5	0.194 6	0.362 8	0.005 0	1 986	34	1 998	28	1 995	24
19	22	71	90	0.79	0.083 2	0.002 1	2.433 9	0.097 8	0.213 9	0.003 9	1 273	46	1 253	29	1 250	21
20	10	151	175	0.87	0.053 5	0.003 7	0.329 3	0.029 9	0.045 9	0.001 1	348	150	289	23	289	7
21	23	28	59	0.48	0.118 5	0.002 3	5.575 1	0.189 8	0.341 8	0.006 2	1 934	33	1 912	29	1 896	30
22	39	48	58	0.82	0.182 1	0.002 6	13.047 8	0.361 9	0.522 7	0.009 2	2 672	22	2 683	26	2 711	39
23	36	65	52	1.23	0.1773	0.002 4	12.167 0	0.323 2	0.499 6	0.008 3	2 628	21	2 617	25	2 612	36
26	40	52	66	0.79	0.164 8	0.002 7	10.715 1	0.314 1	0.473 4	0.007 7	2 505	26	2 499	27	2 498	34
28	204	115	603	0.19	0.114 1	0.001 4	5.006 6	0.107 6	0.317 3	0.003 5	1 866	21	1 820	18	1 777	17
29	7	15	20	0.75	0.109 4	0.004 0	4.185 3	0.259 2	0.305 9	0.009 4	1 789	64	1 671	51	1 720	46
31	21	65	39	1.67	0.121 4	0.002 9	5.965 2	0.227 8	0.360 4	0.006 3	1 977	40	1 971	33	1 984	30
32	36	193	479	0.4	0.055 3	0.001 3	0.522 6	0.018 5	0.068 7	0.001 0	424	49	427	12	428	6
33	9	92	129	0.71	0.056 5	0.002 8	0.431 1	0.030 6	0.057 8	0.001 5	473	104	364	22	362	9
34	15	197	246	0.8	0.050 4	0.002 4	0.345 3	0.021 3	0.049 8	0.000 8	213	103	301	16	313	5
35	126	201	309	0.65	0.114 9	0.001 3	5.340 2	0.115 0	0.337 9	0.004 3	1 878	20	1 875	18	1 876	21
36	31	52	86	0.61	0.106 7	0.002 4	4.452 8	0.157 9	0.305 2	0.004 9	1 743	38	1 722	29	1 717	24
37	7	74	105	0.7	0.057 8	0.003 5	0.413 5	0.033 4	0.054 3	0.001 3	523	126	351	24	341	8
39	15	254	228	1.11	0.056 2	0.002 8	0.381 0	0.025 2	0.051	0.000 9	459	106	328	19	321	6
40	64	100	105	0.95	0.162 5	0.003 0	10.412 5	0.350 3	0.464 1	0.008 9	2 482	29	2 472	31	2 458	39
41	515	438	1 371	0.32	0.114 6	0.001 3	5.444 2	0.105 6	0.343 7	0.003 6	1 874	19	1 892	17	1 904	17
42	252	96	515	0.19	0.162 0	0.001 7	9.989 7	0.187 5	0.446 2	0.004 5	2 477	17	2 434	17	2 378	20
43	9	19	27	0.69	0.107 5	0.003 4	4.254 9	0.209 7	0.297 1	0.006 4	1 757	54	1 685	41	1 677	32
44	35	37	101	0.37	0.107 5	0.002 4	4.784 3	0.158 7	0.322 4	0.004 2	1 757	38	1 782	28	1 801	20
45	55	160	126	1.27	0.114 9	0.002 0	5.283 9	0.152 6	0.333 3	0.004 5	1 879	30	1 866	25	1 854	22
47	53	53	93	0.57	0.166 9	0.002 2	11.024 2	0.268 3	0.480 1	0.006 7	2 526	21	2 525	23	2 528	29
48	74	146	185	0.79	0.113 6	0.001 9	5.169 2	0.148 4	0.329 3	0.004 8	1 857	29	1 848	24	1 835	23
49	17	45	39	1.14	0.119 9	0.003 1	5.744 6	0.237 6	0.350 9	0.006 5	1 955	44	1 938	36	1 939	31
50	8	49	44	1.13	0.071 5	0.003 7	1.409 0	0.100 0	0.145 6	0.003 4	971	99	893	42	876	19
51	5	26	35	0.75	0.073 3	0.003 3	1.321 5	0.089 0	0.137 6	0.003 7	1 022	86	855	39	831	21
53	17	23	43	0.53	0.120 7	0.002 5	5.693 4	0.207 2	0.346 8	0.006 6	1 967	36	1 930	31	1 919	31
54	9	91	166	0.55	0.059 2	0.003 0	0.382 9	0.025 8	0.047 9	0.000 9	574	109	329	19	302	6
56	8	77	170	0.45	0.055 2	0.003 2	0.333 2	0.026 1	0.045 1	0.001 1	422	125	292	20	284	7
57	52	127	121	1.05	0.113 9	0.002 3	5.324 8	0.180 4	0.340 7	0.005 5	1 863	36	1 873	29	1 890	27
58	24	49	59	0.84	0.114 1	0.002 9	5.272 1	0.203 0	0.337 7	0.005 3	1 865	44	1 864	33	1 876	26
60	97	40	280	0.14	0.116 6	0.002 3	5.332 3	0.185 2	0.334 8	0.006 1	1 904	35	1 874	30	1 862	29
62	18	92	355	0.26	0.057 1	0.003 0	0.386 1	0.026 6	0.049 4	0.000 9	496	113	332	20	311	6
64	36	42	477	0.09	0.060 5	0.001 4	0.648 5	0.021 6	0.078 2	0.001 0	620	47	508	13	485	6
65	10	103	180	0.57	0.055 3	0.003 5	0.361 4	0.030 5	0.048 0	0.001 2	426	136	313	23	302	7
66	104	77	278	0.28	0.119 9	0.001 8	5.757 2	0.136 0	0.347 9	0.003 8	1 955	25	1 940	20	1 925	18
67	49	404	649	0.62	0.056 7	0.002 2	0.526 8	0.028 0	0.067 3	0.001 1	478	84	430	19	420	7
68	29	550	604	0.91	0.056 6	0.002 4	0.314 2	0.017 5	0.040 7	0.000 6	476	92	277	14	257	4
69	107	221	258	0.85	0.119 2	0.002 2	5.576 1	0.154 1	0.338 3	0.003 6	1 944	32	1 912	24	1 878	17
70	70	63	143	0.44	0.147 9	0.002 7	8.825 4	0.256 7	0.432 6	0.005 8	2 322	30	2 320	27	2 317	26
71	16	168	293	0.57	0.052 9	0.002 1	0.359 6	0.019 7	0.050 1	0.000 9	324	86	312	15	315	6
72	10	64	112	0.58	0.064 6	0.002 9	0.697 8	0.043 9	0.079 3	0.001 6	762	93	537	26	492	10
73	89	42	242	0.17	0.118 7	0.001 7	5.787 4	0.139 3	0.353 1	0.004 2	1 936	25	1 945	21	1 950	20
74	27	22	66	0.34	0.125 7	0.002 0	6.325 3	0.177 5	0.366 8	0.005 7	2 039	27	2 022	25	2 014	27
75	11	26	27	0.95	0.103 6	0.002 8	4.564 3	0.203 9	0.327 2	0.006 9	1 690	49	1 743	37	1 825	33
76	109	187	211	0.89	0.150 3	0.002 0	8.587 7	0.194 8	0.414 6	0.005 0	2 350	21	2 295	21	2 236	23
78	68	174	91	1.91	0.173 5	0.002 3	11.693 2	0.275 2	0.490 4	0.006 2	2 592	22	2 580	22	2 573	27
80	18	200	190	1.05	0.056 3	0.002 4	0.596 9	0.032 7	0.076 9	0.001 1	462	91	475	21	478	7

Table 3 Detrital zircon U-Pb isotopic data from the Xujiahe Formation in Huize area

点号	元素含量/10^-6			Th/U	同位素比值及误差						同位素年龄及误差/Ma
	Pb	Th	U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
	Pb	Th	U		比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ	比值	1σ
2	7	35	43	0.81	0.075 7	0.004 6	1.448 3	0.123 7	0.142 5	0.004 0	1 087	117	909	51	859	23
3	86	117	196	0.59	0.125 1	0.001 7	6.678 8	0.163 8	0.385 6	0.005 2	2 030	23	2 070	22	2 103	24
4	19	49	48	1.01	0.109 3	0.002 4	4.855 2	0.172 0	0.323 8	0.005 5	1 787	37	1 795	30	1 808	27
5	12	83	144	0.57	0.058 5	0.002 1	0.626 5	0.032 6	0.079 0	0.001 4	547	76	494	20	490	9
6	11	63	135	0.47	0.059 8	0.003 3	0.604 2	0.043 9	0.074 4	0.001 5	595	114	480	28	463	9
7	16	109	101	1.08	0.065 9	0.002 6	1.174 4	0.065 6	0.129 0	0.002 5	804	78	789	31	782	14
8	27	62	59	1.05	0.124 2	0.002 6	6.312 2	0.220 5	0.370 1	0.006 4	2 018	35	2 020	31	2 030	30
9	27	55	55	0.99	0.136 0	0.002 6	7.573 0	0.255 6	0.404 9	0.007 5	2 176	31	2 182	30	2 192	35
10	129	186	341	0.55	0.117 1	0.001 8	5.570 4	0.148 5	0.343 8	0.004 9	1 912	26	1 912	23	1 905	23
11	36	54	55	0.98	0.164 1	0.003 2	11.888 2	0.389 4	0.524 2	0.008 6	2 499	31	2 596	31	2 717	36
12	29	53	68	0.77	0.124 9	0.002 6	6.292 6	0.214 6	0.365 9	0.006 0	2 027	35	2 017	30	2 010	28
13	17	109	99	1.09	0.074 7	0.003 1	1.388 9	0.081 8	0.136 3	0.002 7	1 061	80	884	35	823	15
16	81	178	180	0.99	0.122 0	0.002 5	6.154 5	0.194 6	0.362 8	0.005 0	1 986	34	1 998	28	1 995	24
19	22	71	90	0.79	0.083 2	0.002 1	2.433 9	0.097 8	0.213 9	0.003 9	1 273	46	1 253	29	1 250	21
20	10	151	175	0.87	0.053 5	0.003 7	0.329 3	0.029 9	0.045 9	0.001 1	348	150	289	23	289	7
21	23	28	59	0.48	0.118 5	0.002 3	5.575 1	0.189 8	0.341 8	0.006 2	1 934	33	1 912	29	1 896	30
22	39	48	58	0.82	0.182 1	0.002 6	13.047 8	0.361 9	0.522 7	0.009 2	2 672	22	2 683	26	2 711	39
23	36	65	52	1.23	0.1773	0.002 4	12.167 0	0.323 2	0.499 6	0.008 3	2 628	21	2 617	25	2 612	36
26	40	52	66	0.79	0.164 8	0.002 7	10.715 1	0.314 1	0.473 4	0.007 7	2 505	26	2 499	27	2 498	34
28	204	115	603	0.19	0.114 1	0.001 4	5.006 6	0.107 6	0.317 3	0.003 5	1 866	21	1 820	18	1 777	17
29	7	15	20	0.75	0.109 4	0.004 0	4.185 3	0.259 2	0.305 9	0.009 4	1 789	64	1 671	51	1 720	46
31	21	65	39	1.67	0.121 4	0.002 9	5.965 2	0.227 8	0.360 4	0.006 3	1 977	40	1 971	33	1 984	30
32	36	193	479	0.4	0.055 3	0.001 3	0.522 6	0.018 5	0.068 7	0.001 0	424	49	427	12	428	6
33	9	92	129	0.71	0.056 5	0.002 8	0.431 1	0.030 6	0.057 8	0.001 5	473	104	364	22	362	9
34	15	197	246	0.8	0.050 4	0.002 4	0.345 3	0.021 3	0.049 8	0.000 8	213	103	301	16	313	5
35	126	201	309	0.65	0.114 9	0.001 3	5.340 2	0.115 0	0.337 9	0.004 3	1 878	20	1 875	18	1 876	21
36	31	52	86	0.61	0.106 7	0.002 4	4.452 8	0.157 9	0.305 2	0.004 9	1 743	38	1 722	29	1 717	24
37	7	74	105	0.7	0.057 8	0.003 5	0.413 5	0.033 4	0.054 3	0.001 3	523	126	351	24	341	8
39	15	254	228	1.11	0.056 2	0.002 8	0.381 0	0.025 2	0.051	0.000 9	459	106	328	19	321	6
40	64	100	105	0.95	0.162 5	0.003 0	10.412 5	0.350 3	0.464 1	0.008 9	2 482	29	2 472	31	2 458	39
41	515	438	1 371	0.32	0.114 6	0.001 3	5.444 2	0.105 6	0.343 7	0.003 6	1 874	19	1 892	17	1 904	17
42	252	96	515	0.19	0.162 0	0.001 7	9.989 7	0.187 5	0.446 2	0.004 5	2 477	17	2 434	17	2 378	20
43	9	19	27	0.69	0.107 5	0.003 4	4.254 9	0.209 7	0.297 1	0.006 4	1 757	54	1 685	41	1 677	32
44	35	37	101	0.37	0.107 5	0.002 4	4.784 3	0.158 7	0.322 4	0.004 2	1 757	38	1 782	28	1 801	20
45	55	160	126	1.27	0.114 9	0.002 0	5.283 9	0.152 6	0.333 3	0.004 5	1 879	30	1 866	25	1 854	22
47	53	53	93	0.57	0.166 9	0.002 2	11.024 2	0.268 3	0.480 1	0.006 7	2 526	21	2 525	23	2 528	29
48	74	146	185	0.79	0.113 6	0.001 9	5.169 2	0.148 4	0.329 3	0.004 8	1 857	29	1 848	24	1 835	23
49	17	45	39	1.14	0.119 9	0.003 1	5.744 6	0.237 6	0.350 9	0.006 5	1 955	44	1 938	36	1 939	31
50	8	49	44	1.13	0.071 5	0.003 7	1.409 0	0.100 0	0.145 6	0.003 4	971	99	893	42	876	19
51	5	26	35	0.75	0.073 3	0.003 3	1.321 5	0.089 0	0.137 6	0.003 7	1 022	86	855	39	831	21
53	17	23	43	0.53	0.120 7	0.002 5	5.693 4	0.207 2	0.346 8	0.006 6	1 967	36	1 930	31	1 919	31
54	9	91	166	0.55	0.059 2	0.003 0	0.382 9	0.025 8	0.047 9	0.000 9	574	109	329	19	302	6
56	8	77	170	0.45	0.055 2	0.003 2	0.333 2	0.026 1	0.045 1	0.001 1	422	125	292	20	284	7
57	52	127	121	1.05	0.113 9	0.002 3	5.324 8	0.180 4	0.340 7	0.005 5	1 863	36	1 873	29	1 890	27
58	24	49	59	0.84	0.114 1	0.002 9	5.272 1	0.203 0	0.337 7	0.005 3	1 865	44	1 864	33	1 876	26
60	97	40	280	0.14	0.116 6	0.002 3	5.332 3	0.185 2	0.334 8	0.006 1	1 904	35	1 874	30	1 862	29
62	18	92	355	0.26	0.057 1	0.003 0	0.386 1	0.026 6	0.049 4	0.000 9	496	113	332	20	311	6
64	36	42	477	0.09	0.060 5	0.001 4	0.648 5	0.021 6	0.078 2	0.001 0	620	47	508	13	485	6
65	10	103	180	0.57	0.055 3	0.003 5	0.361 4	0.030 5	0.048 0	0.001 2	426	136	313	23	302	7
66	104	77	278	0.28	0.119 9	0.001 8	5.757 2	0.136 0	0.347 9	0.003 8	1 955	25	1 940	20	1 925	18
67	49	404	649	0.62	0.056 7	0.002 2	0.526 8	0.028 0	0.067 3	0.001 1	478	84	430	19	420	7
68	29	550	604	0.91	0.056 6	0.002 4	0.314 2	0.017 5	0.040 7	0.000 6	476	92	277	14	257	4
69	107	221	258	0.85	0.119 2	0.002 2	5.576 1	0.154 1	0.338 3	0.003 6	1 944	32	1 912	24	1 878	17
70	70	63	143	0.44	0.147 9	0.002 7	8.825 4	0.256 7	0.432 6	0.005 8	2 322	30	2 320	27	2 317	26
71	16	168	293	0.57	0.052 9	0.002 1	0.359 6	0.019 7	0.050 1	0.000 9	324	86	312	15	315	6
72	10	64	112	0.58	0.064 6	0.002 9	0.697 8	0.043 9	0.079 3	0.001 6	762	93	537	26	492	10
73	89	42	242	0.17	0.118 7	0.001 7	5.787 4	0.139 3	0.353 1	0.004 2	1 936	25	1 945	21	1 950	20
74	27	22	66	0.34	0.125 7	0.002 0	6.325 3	0.177 5	0.366 8	0.005 7	2 039	27	2 022	25	2 014	27
75	11	26	27	0.95	0.103 6	0.002 8	4.564 3	0.203 9	0.327 2	0.006 9	1 690	49	1 743	37	1 825	33
76	109	187	211	0.89	0.150 3	0.002 0	8.587 7	0.194 8	0.414 6	0.005 0	2 350	21	2 295	21	2 236	23
78	68	174	91	1.91	0.173 5	0.002 3	11.693 2	0.275 2	0.490 4	0.006 2	2 592	22	2 580	22	2 573	27
80	18	200	190	1.05	0.056 3	0.002 4	0.596 9	0.032 7	0.076 9	0.001 1	462	91	475	21	478	7

Fig.7 Cathodoluminescence (CL) images of representative zircons from Xujiahe Formation sandstone of the Huize area

Fig.8 Concordia plot (a),histograms and relative probability plots ((b), (c) and (d)) of detrital zircon U-Pb ages of sandstones in the Huize area

Fig.9 Normalized probability plots for Xujiahe Formation and Feixianguan Formation from Huize area

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