Petrogenesis and Tectonic Setting of the Nanpaotai Granite Porphyry in Inner Mongolia: Constraints from Zircon U-Pb Geochronology, Hf Isotopes, and Whole-rock Geochemistry

doi:10.19657/j.geoscience.1000-8527.2023.080

Abstract

Abstract:

Intensive magmatism in early Early Cretaceous is recorded in the Duolun area, which is located in the middle segment of the northern margin of North China Plate.Interpretation of the tectonic setting can aid to resolve the controversy whether the magmatism is controlled by the Mongol-Okhotsk tectonic activities or by the subduction of the Paleo-Pacific Plate.This paper presents the LA-ICP-MS zircon U-Pb geochronology, Hf isotopes, and whole-rock geochemistry of the Nanpaotai granite porphyry in Duolun.Zircons U-Pb dating on the granite porphyry shows a weighted mean age of 136±1 Ma, indicating that it was formed in early Early Cretaceous.The zircon ε_Hf(t) values vary between -8.1 and +1.9, with Hf isotopes crustal model ages ($\mathrm{T}_{\mathrm{DM}}{ }^{\mathrm{C}}$) ranging from 1,044 to 1,680 Ma.The Nanpaotai granite porphyry belongs to slightly peraluminous shoshonite series, enriched in SiO₂ (70.53%-72.72%), total alkali (K₂O+Na₂O=9.09%-9.48%), but poor in MgO (0.19%-0.39%), CaO (0.55%-0.67%), and P₂O₅ (0.19%-0.39%).It is also enriched in LREE and LILEs (e.g., K, Cs and Rb), depleted in HFSEs (e.g., Nb, Ta and Ti), Sr and P elements, with (La/Yb)_N ratio varying between 22.10 and 57.67, and showing a negative Eu anomaly (δEu=0.38-0.52).Comprehensive geochemical evidence indicate that the Nanpaotai granite porphyry was formed in the intraplate anorogenic extensional tectonic environment and belongs to A-type granite.The primary magma mainly derived from the partial melting of the ancient lower crust, and there was mixing of mantle-derived components.Combined with the regional tectonic evolution, it is considered that the early Early Cretaceous magmatism in Duolun is related to an extensional tectonic environment after the closure of Mongol-Okhotsk Ocean.This suggests that the influence of the Mongol-Okhotsk tectonic system along the southeast direction had extended to Southeastern Inner Mongolia in the middle segment of the northern margin of North China Plate.

Key words: granite porphyry, zircon U-Pb age, Hf isotopes, petrogeochemistry, geological significance

CLC Number:

P588

LIU Qingzhan, JIANG Xiaojun, WANG Guo, LI Tianyu, LI Dongpeng. Petrogenesis and Tectonic Setting of the Nanpaotai Granite Porphyry in Inner Mongolia: Constraints from Zircon U-Pb Geochronology, Hf Isotopes, and Whole-rock Geochemistry[J]. Geoscience, 2024, 38(01): 154-168.

Figures/Tables 15

Fig.1 Regional tectonic sketch of middle Inner Mongolia (a) and geological sketch of the study area (b) (modified after refs [5] and [37], respectively)

Fig.2 Hand specimen(a) and microphotograph (b) features of the Nanpaotai granite porphyry

Table 1 Zircon U-Pb dating data for the Nanpaotai granite porphyry

测点号	含量(10^-6)		Th/U	同位素比值						年龄(Ma)
测点号	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
D025-02	193	366	0.53	0.0481	0.0010	0.1416	0.0034	0.0214	0.0003	103.6	47.8	134.5	3.0	136.5	1.7
D025-03	179	345	0.52	0.0488	0.0013	0.1451	0.0042	0.0216	0.0002	137.1	60.0	137.6	3.7	137.4	1.5
D025-04	364	471	0.77	0.0478	0.0010	0.1422	0.0038	0.0215	0.0003	90.6	50.5	135	3.4	137.4	1.7
D025-05	146	154	0.95	0.0482	0.0016	0.1391	0.0049	0.0211	0.0003	106.7	78.6	132.3	4.4	134.4	1.6
D025-06	133	262	0.51	0.0495	0.0014	0.1454	0.0043	0.0214	0.0003	173.7	66.3	137.8	3.8	136.3	1.7
D025-07	230	408	0.56	0.0496	0.0010	0.1457	0.0033	0.0214	0.0003	174.6	44.8	138.1	2.9	136.4	1.6
D025-08	310	610	0.51	0.0491	0.0011	0.1453	0.0033	0.0215	0.0003	153.8	50.7	137.7	3.0	137.0	1.8
D025-09	212	380	0.56	0.0481	0.0016	0.1426	0.0054	0.0215	0.0003	102.1	80.8	135.3	4.8	136.9	1.6
D025-10	550	569	0.97	0.0490	0.0008	0.1432	0.0028	0.0212	0.0002	149.8	38.6	135.9	2.5	135.2	1.4
D025-11	215	241	0.89	0.0490	0.0015	0.1442	0.0046	0.0213	0.0002	149.4	71.5	136.8	4.1	136.0	1.4
D025-12	233	572	0.41	0.0475	0.0014	0.1433	0.0051	0.0218	0.0004	74.9	70.1	136.0	4.6	138.8	2.3
D025-13	290	639	0.45	0.0481	0.0011	0.1425	0.0036	0.0215	0.0003	101.8	55.5	135.3	3.2	137.2	1.9
D025-14	210	337	0.62	0.0494	0.0013	0.1453	0.0042	0.0215	0.0004	165.8	63.4	137.8	3.8	136.8	2.3
D025-15	259	453	0.57	0.0490	0.0009	0.1433	0.0029	0.0213	0.0002	147.6	44.5	136.0	2.6	135.6	1.3
D025-16	221	403	0.55	0.0486	0.0013	0.1438	0.0044	0.0215	0.0003	127.2	64.7	136.4	3.9	137.0	1.7
D025-17	133	312	0.43	0.0486	0.0009	0.1417	0.0030	0.0212	0.0002	129.2	45.2	134.5	2.6	135.1	1.5
D025-18	403	595	0.68	0.0498	0.0009	0.1455	0.0027	0.0212	0.0002	187.1	40.4	137.9	2.4	135.2	1.3
D025-19	155	198	0.78	0.0495	0.0012	0.1446	0.0038	0.0212	0.0003	172.5	58.2	137.1	3.4	135.5	1.6
D025-20	276	595	0.46	0.0487	0.0009	0.1436	0.0030	0.0214	0.0002	132.4	42.7	136.2	2.6	136.4	1.3
D025-21	173	284	0.61	0.0501	0.0014	0.1467	0.0039	0.0213	0.0002	200.9	64.5	139.0	3.5	135.8	1.4
D025-22	215	363	0.59	0.0495	0.0011	0.1443	0.0032	0.0212	0.0002	171.0	50.6	136.8	2.9	135.1	1.3
D025-23	400	603	0.66	0.0488	0.0008	0.1423	0.0024	0.0212	0.0002	136.1	37.4	135.0	2.2	135.1	1.3
D025-24	280	479	0.58	0.0493	0.0008	0.1443	0.0026	0.0212	0.0002	162.8	38.9	136.9	2.3	135.5	1.1
D025-25	252	508	0.50	0.0487	0.0011	0.1431	0.0033	0.0214	0.0002	133.0	52.6	135.8	2.9	136.2	1.5

Table 1 Zircon U-Pb dating data for the Nanpaotai granite porphyry

测点号	含量(10^-6)		Th/U	同位素比值						年龄(Ma)
测点号	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
D025-02	193	366	0.53	0.0481	0.0010	0.1416	0.0034	0.0214	0.0003	103.6	47.8	134.5	3.0	136.5	1.7
D025-03	179	345	0.52	0.0488	0.0013	0.1451	0.0042	0.0216	0.0002	137.1	60.0	137.6	3.7	137.4	1.5
D025-04	364	471	0.77	0.0478	0.0010	0.1422	0.0038	0.0215	0.0003	90.6	50.5	135	3.4	137.4	1.7
D025-05	146	154	0.95	0.0482	0.0016	0.1391	0.0049	0.0211	0.0003	106.7	78.6	132.3	4.4	134.4	1.6
D025-06	133	262	0.51	0.0495	0.0014	0.1454	0.0043	0.0214	0.0003	173.7	66.3	137.8	3.8	136.3	1.7
D025-07	230	408	0.56	0.0496	0.0010	0.1457	0.0033	0.0214	0.0003	174.6	44.8	138.1	2.9	136.4	1.6
D025-08	310	610	0.51	0.0491	0.0011	0.1453	0.0033	0.0215	0.0003	153.8	50.7	137.7	3.0	137.0	1.8
D025-09	212	380	0.56	0.0481	0.0016	0.1426	0.0054	0.0215	0.0003	102.1	80.8	135.3	4.8	136.9	1.6
D025-10	550	569	0.97	0.0490	0.0008	0.1432	0.0028	0.0212	0.0002	149.8	38.6	135.9	2.5	135.2	1.4
D025-11	215	241	0.89	0.0490	0.0015	0.1442	0.0046	0.0213	0.0002	149.4	71.5	136.8	4.1	136.0	1.4
D025-12	233	572	0.41	0.0475	0.0014	0.1433	0.0051	0.0218	0.0004	74.9	70.1	136.0	4.6	138.8	2.3
D025-13	290	639	0.45	0.0481	0.0011	0.1425	0.0036	0.0215	0.0003	101.8	55.5	135.3	3.2	137.2	1.9
D025-14	210	337	0.62	0.0494	0.0013	0.1453	0.0042	0.0215	0.0004	165.8	63.4	137.8	3.8	136.8	2.3
D025-15	259	453	0.57	0.0490	0.0009	0.1433	0.0029	0.0213	0.0002	147.6	44.5	136.0	2.6	135.6	1.3
D025-16	221	403	0.55	0.0486	0.0013	0.1438	0.0044	0.0215	0.0003	127.2	64.7	136.4	3.9	137.0	1.7
D025-17	133	312	0.43	0.0486	0.0009	0.1417	0.0030	0.0212	0.0002	129.2	45.2	134.5	2.6	135.1	1.5
D025-18	403	595	0.68	0.0498	0.0009	0.1455	0.0027	0.0212	0.0002	187.1	40.4	137.9	2.4	135.2	1.3
D025-19	155	198	0.78	0.0495	0.0012	0.1446	0.0038	0.0212	0.0003	172.5	58.2	137.1	3.4	135.5	1.6
D025-20	276	595	0.46	0.0487	0.0009	0.1436	0.0030	0.0214	0.0002	132.4	42.7	136.2	2.6	136.4	1.3
D025-21	173	284	0.61	0.0501	0.0014	0.1467	0.0039	0.0213	0.0002	200.9	64.5	139.0	3.5	135.8	1.4
D025-22	215	363	0.59	0.0495	0.0011	0.1443	0.0032	0.0212	0.0002	171.0	50.6	136.8	2.9	135.1	1.3
D025-23	400	603	0.66	0.0488	0.0008	0.1423	0.0024	0.0212	0.0002	136.1	37.4	135.0	2.2	135.1	1.3
D025-24	280	479	0.58	0.0493	0.0008	0.1443	0.0026	0.0212	0.0002	162.8	38.9	136.9	2.3	135.5	1.1
D025-25	252	508	0.50	0.0487	0.0011	0.1431	0.0033	0.0214	0.0002	133.0	52.6	135.8	2.9	136.2	1.5

Fig.3 Zircon cathodoluminescence images from the Nanpaotai granite porphyry

Fig.4 Chondrite-normalized REE diagrams (a) (normalization values from ref [48]) and the U-Pb concordia diagram of zircons from the Nanpaotai granite porphyry (b)

Table 2 Trace element (10-6) data for the zircon of the Nanpaotai granite porphyry

样号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
D025-02	7.63	40.30	2.23	10.39	4.33	0.23	15.53	5.33	68.42	25.57	126.99	29.22	298.87	47.63
D025-03	2.85	21.27	1.09	7.23	7.16	0.07	31.70	10.31	119.58	41.07	178.95	36.23	322.66	46.99
D025-04	0.03	21.96	0.35	5.46	10.76	0.07	52.13	15.47	183.00	60.99	257.97	50.92	447.62	63.81
D025-05	0.04	23.59	0.35	5.74	9.92	1.59	43.32	13.21	156.50	52.34	230.79	48.46	450.69	69.86
D025-06	18.44	61.46	5.22	22.51	6.07	0.32	17.10	5.11	66.11	24.24	119.31	27.61	280.01	45.61
D025-07	0.03	16.09	0.42	7.32	13.51	0.09	64.31	20.16	234.07	78.43	325.71	63.37	541.14	78.22
D025-08	0.05	24.88	0.22	3.69	9.38	0.07	52.39	17.65	212.39	69.83	304.78	59.89	522.94	70.46
D025-09	0.02	15.04	0.13	2.89	6.59	0.02	34.68	10.86	126.36	43.39	188.24	37.21	340.16	47.22
D025-10	0.05	29.46	0.54	8.45	17.45	0.13	84.83	24.68	281.26	91.49	379.15	72.89	613.00	90.45
D025-11	8.14	65.70	2.46	12.79	7.08	0.94	26.06	8.06	99.47	35.01	162.53	35.64	339.91	52.20
D025-12	93.53	233.69	32.05	145.69	37.44	0.57	52.94	12.58	132.56	44.18	198.97	42.11	387.32	54.80
D025-13	0.03	27.87	0.10	2.23	5.27	0.16	31.08	10.73	138.07	49.57	231.93	50.53	465.84	68.77
D025-14	4.36	37.19	1.31	6.58	4.65	0.39	20.26	6.85	85.92	31.38	148.80	33.03	328.02	50.60
D025-15	6.38	46.39	2.24	10.27	5.36	0.32	18.63	6.34	81.54	30.22	148.59	34.66	350.36	56.18
D025-16	0.04	15.67	0.34	6.07	13.86	0.09	70.56	21.97	257.05	84.66	354.50	67.23	569.64	84.02
D025-17	0.06	11.77	0.08	1.64	4.03	0.03	21.68	7.20	90.66	31.60	141.54	29.12	261.53	39.21
D025-18	64.17	192.44	24.45	119.29	39.71	0.20	83.15	21.97	239.78	76.37	317.10	60.91	509.11	74.45
D025-19	25.76	82.04	7.07	31.90	9.95	0.73	27.90	8.11	97.93	34.22	157.22	34.45	325.58	52.15
D025-20	0.01	17.79	0.10	2.09	5.61	0.04	31.76	10.79	135.96	47.24	209.04	43.02	370.90	54.05
D025-21	30.69	89.40	8.60	36.24	8.94	0.42	19.83	5.62	70.10	25.07	119.43	27.12	271.06	44.14
D025-22	3.95	32.42	1.14	6.06	3.99	0.17	18.92	6.18	79.08	28.84	136.10	29.92	283.96	44.30
D025-23	7.29	43.61	2.69	15.90	12.56	0.07	55.12	17.23	203.38	67.52	285.43	56.47	483.43	68.85
D025-24	37.77	112.48	9.79	41.98	10.82	0.66	25.34	7.87	100.57	38.39	191.16	44.67	457.81	75.74
D025-25	/	24.66	0.06	1.22	3.08	0.13	17.69	6.34	82.31	31.27	153.03	34.74	341.51	53.49

Table 2 Trace element (10-6) data for the zircon of the Nanpaotai granite porphyry

样号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
D025-02	7.63	40.30	2.23	10.39	4.33	0.23	15.53	5.33	68.42	25.57	126.99	29.22	298.87	47.63
D025-03	2.85	21.27	1.09	7.23	7.16	0.07	31.70	10.31	119.58	41.07	178.95	36.23	322.66	46.99
D025-04	0.03	21.96	0.35	5.46	10.76	0.07	52.13	15.47	183.00	60.99	257.97	50.92	447.62	63.81
D025-05	0.04	23.59	0.35	5.74	9.92	1.59	43.32	13.21	156.50	52.34	230.79	48.46	450.69	69.86
D025-06	18.44	61.46	5.22	22.51	6.07	0.32	17.10	5.11	66.11	24.24	119.31	27.61	280.01	45.61
D025-07	0.03	16.09	0.42	7.32	13.51	0.09	64.31	20.16	234.07	78.43	325.71	63.37	541.14	78.22
D025-08	0.05	24.88	0.22	3.69	9.38	0.07	52.39	17.65	212.39	69.83	304.78	59.89	522.94	70.46
D025-09	0.02	15.04	0.13	2.89	6.59	0.02	34.68	10.86	126.36	43.39	188.24	37.21	340.16	47.22
D025-10	0.05	29.46	0.54	8.45	17.45	0.13	84.83	24.68	281.26	91.49	379.15	72.89	613.00	90.45
D025-11	8.14	65.70	2.46	12.79	7.08	0.94	26.06	8.06	99.47	35.01	162.53	35.64	339.91	52.20
D025-12	93.53	233.69	32.05	145.69	37.44	0.57	52.94	12.58	132.56	44.18	198.97	42.11	387.32	54.80
D025-13	0.03	27.87	0.10	2.23	5.27	0.16	31.08	10.73	138.07	49.57	231.93	50.53	465.84	68.77
D025-14	4.36	37.19	1.31	6.58	4.65	0.39	20.26	6.85	85.92	31.38	148.80	33.03	328.02	50.60
D025-15	6.38	46.39	2.24	10.27	5.36	0.32	18.63	6.34	81.54	30.22	148.59	34.66	350.36	56.18
D025-16	0.04	15.67	0.34	6.07	13.86	0.09	70.56	21.97	257.05	84.66	354.50	67.23	569.64	84.02
D025-17	0.06	11.77	0.08	1.64	4.03	0.03	21.68	7.20	90.66	31.60	141.54	29.12	261.53	39.21
D025-18	64.17	192.44	24.45	119.29	39.71	0.20	83.15	21.97	239.78	76.37	317.10	60.91	509.11	74.45
D025-19	25.76	82.04	7.07	31.90	9.95	0.73	27.90	8.11	97.93	34.22	157.22	34.45	325.58	52.15
D025-20	0.01	17.79	0.10	2.09	5.61	0.04	31.76	10.79	135.96	47.24	209.04	43.02	370.90	54.05
D025-21	30.69	89.40	8.60	36.24	8.94	0.42	19.83	5.62	70.10	25.07	119.43	27.12	271.06	44.14
D025-22	3.95	32.42	1.14	6.06	3.99	0.17	18.92	6.18	79.08	28.84	136.10	29.92	283.96	44.30
D025-23	7.29	43.61	2.69	15.90	12.56	0.07	55.12	17.23	203.38	67.52	285.43	56.47	483.43	68.85
D025-24	37.77	112.48	9.79	41.98	10.82	0.66	25.34	7.87	100.57	38.39	191.16	44.67	457.81	75.74
D025-25	/	24.66	0.06	1.22	3.08	0.13	17.69	6.34	82.31	31.27	153.03	34.74	341.51	53.49

Table 3 Zircon Hf isotopic compositions of the Nanpaotai granite porphyry

测点号	年龄 (Ma)	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/ ¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf (t)	2σ	T_DM (Ma)	$T D M C$ (Ma)	f_Lu/Hf
ND025-1-02	134.5	0.021489	0.000710	0.282504	0.000016	-9.9	-7.0	0.6	1050	1610	-0.98
ND025-1-03	137.6	0.060029	0.001814	0.282727	0.000019	-2.0	0.8	0.7	760	1111	-0.95
ND025-1-04	135.0	0.087223	0.002627	0.282702	0.000024	-3.0	-0.2	0.8	815	1175	-0.92
ND025-1-05	132.3	0.037801	0.001231	0.282558	0.000018	-8.0	-5.2	0.6	988	1492	-0.96
ND025-1-06	137.8	0.024288	0.000806	0.282472	0.000018	-11.1	-8.1	0.6	1098	1680	-0.98
ND025-1-07	138.1	0.037787	0.001153	0.282594	0.000017	-6.7	-3.8	0.6	935	1407	-0.97
ND025-1-08	137.7	0.089925	0.002680	0.282641	0.000018	-5.1	-2.3	0.6	906	1311	-0.92
ND025-1-09	135.3	0.331457	0.008975	0.282770	0.000071	-0.5	1.7	2.5	867	1059	-0.73
ND025-1-10	135.9	0.117371	0.003438	0.282761	0.000021	-0.8	1.9	0.7	743	1044	-0.90
ND025-1-11	136.8	0.044135	0.001452	0.282605	0.000019	-6.4	-3.4	0.7	927	1385	-0.96

Table 3 Zircon Hf isotopic compositions of the Nanpaotai granite porphyry

测点号	年龄 (Ma)	¹⁷⁶Yb/ ¹⁷⁷Hf	¹⁷⁶Lu/ ¹⁷⁷Hf	¹⁷⁶Hf/ ¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf (t)	2σ	T_DM (Ma)	$T D M C$ (Ma)	f_Lu/Hf
ND025-1-02	134.5	0.021489	0.000710	0.282504	0.000016	-9.9	-7.0	0.6	1050	1610	-0.98
ND025-1-03	137.6	0.060029	0.001814	0.282727	0.000019	-2.0	0.8	0.7	760	1111	-0.95
ND025-1-04	135.0	0.087223	0.002627	0.282702	0.000024	-3.0	-0.2	0.8	815	1175	-0.92
ND025-1-05	132.3	0.037801	0.001231	0.282558	0.000018	-8.0	-5.2	0.6	988	1492	-0.96
ND025-1-06	137.8	0.024288	0.000806	0.282472	0.000018	-11.1	-8.1	0.6	1098	1680	-0.98
ND025-1-07	138.1	0.037787	0.001153	0.282594	0.000017	-6.7	-3.8	0.6	935	1407	-0.97
ND025-1-08	137.7	0.089925	0.002680	0.282641	0.000018	-5.1	-2.3	0.6	906	1311	-0.92
ND025-1-09	135.3	0.331457	0.008975	0.282770	0.000071	-0.5	1.7	2.5	867	1059	-0.73
ND025-1-10	135.9	0.117371	0.003438	0.282761	0.000021	-0.8	1.9	0.7	743	1044	-0.90
ND025-1-11	136.8	0.044135	0.001452	0.282605	0.000019	-6.4	-3.4	0.7	927	1385	-0.96

Table 4 Major (%) and trace element (10-6) compositions of the Nanpaotai granite porphyry

样品号	D025-1	D025-2	D025-3	D025-4	D025-5	样品号	D025-1	D025-2	D025-3	D025-4	D025-5
Al₂O₃	14.31	13.76	13.84	14.17	14.11	Zr	442.25	451.98	459.65	468.25	433.78
SiO₂	72.27	71.76	71.81	71.24	70.53	Nb	22.26	26.61	24.39	25.81	22.88
CaO	0.58	0.67	0.55	0.60	0.56	Cs	3.79	3.46	2.70	3.87	3.33
K₂O	5.45	5.02	5.33	5.17	4.97	Ba	895.82	677.81	845.03	816.33	930.30
TFe₂O₃	1.79	2.52	2.28	2.90	2.94	La	95.58	44.72	109.21	56.35	81.68
MgO	0.19	0.24	0.31	0.35	0.39	Ce	175.25	169.99	181.31	171.99	166.91
MnO	0.02	0.03	0.04	0.05	0.04	Pr	13.85	10.86	17.14	12.14	13.80
Na₂O	3.96	4.07	4.13	4.16	4.51	Nd	46.09	38.44	63.67	46.06	52.86
P₂O₅	0.08	0.10	0.07	0.10	0.11	Sm	6.58	6.36	10.21	8.29	9.35
TiO₂	0.35	0.43	0.36	0.43	0.42	Eu	1.10	0.92	1.25	1.13	1.27
LOI	1.00	1.11	0.89	0.95	1.20	Gd	6.31	5.87	9.59	7.54	8.08
Total	99.99	99.71	99.62	100.12	99.77	Tb	0.77	0.82	1.36	1.06	1.19
Mg^#	17	16	21	19	21	Dy	3.75	4.43	6.91	5.99	6.27
A/CNK	1.06	1.03	1.02	1.05	1.02	Ho	0.75	0.83	1.30	1.06	1.15
Na₂O+K₂O	9.41	9.09	9.46	9.33	9.48	Er	2.31	2.69	4.06	3.35	3.53
Li	22.09	24.82	25.58	27.29	25.94	Tm	0.36	0.45	0.60	0.52	0.53
Be	3.30	4.09	4.33	4.28	4.47	Yb	2.64	3.22	3.88	3.64	3.59
Sc	4.02	4.40	4.24	4.89	4.72	Lu	0.38	0.45	0.60	0.52	0.53
V	18.88	17.52	14.01	17.61	18.57	Hf	11.34	11.84	11.84	11.65	10.84
Cr	0.66	0.74	1.23	0.43	0.55	Ta	1.57	1.73	1.70	1.68	1.52
Co	1.40	1.49	1.82	2.60	2.75	Th	39.19	40.91	39.92	35.11	33.88
Ni	2.05	2.69	1.08	2.61	3.62	U	2.89	4.68	5.55	9.44	2.51
Pb	23.54	24.13	24.22	27.41	16.87	δEu	0.52	0.45	0.38	0.43	0.44
Ga	25.67	25.43	26.93	25.84	25.33	(La/Yb)_N	24.45	9.37	18.97	10.43	15.33
Rb	216.37	208.55	225.54	208.95	183.94	∑REE	371.66	308.84	442.72	344.27	375.98
Sr	136.57	127.31	141.01	149.59	130.98	LREE/HREE	10.19	7.23	6.39	6.13	6.50
Y	15.95	18.80	31.64	24.63	25.23	T_zr(℃)	884	883	883	887	875

Fig.5 Diagrams of TAS (a), K2O versus SiO2 (b) and A/NK versus A/CNK (c) for the Nanpaotai granite porphyry(base maps after refs[49], [50]and [51], respectively; data from refs.[31-32,36,52⇓-54])

Fig.6 Chondrite-normalized REE spider diagrams (a) and primitive mantle-normalized spider diagrams of trace elements (b) for the Nanpaotai granite porphyry (normalization values from ref.[48] and [55], respectively; data from refs.[31-32,36,52⇓-54])

Fig.7 Genetic type discrimination for the Nanpaotai granite porphyry (basemap after ref.[58]; data from refs.[31-32,36,52⇓-54])

Fig.8 Zircon ε H f(t) vs.age plots for Nanpaotai graniteporphyry

Fig.9 Discrimination diagrams of A-type granite (a) and R1-R2 tectonic environment (b) for the Nanpaotai granite porphyry (base maps after refs.[56]and [77], respectively; data from refs.[31-32,36,52⇓-54])

Table 5 Early Cretaceous geochronology data of Duolun and its adjacent areas

序号	样品号	纬度	经度	采样位置	岩性	年龄(Ma)	测试方法	来源
侵入岩
1	WB08-N3	42°20'10″	144°55'05″	那仁乌拉	碱长花岗岩	144.9±1.3	LA-ICP-MS	文献[52]
2	729-2S	—	—	姚五沟	花岗斑岩	141.6±1.3	LA-ICP-MS	文献[53]
3	LQ-67	42°22'29″	115°44'22″	正蓝旗	花岗斑岩	140.9±1.0	LA-ICP-MS	文献[36]
4	DH-23	42°15'00″	114°12'16″	道郎呼都格	钾长花岗岩	139.6±1.7	SHRIMP	文献[32]
5	TW03	—	—	多伦县	石英二长斑岩	138.4±0.6	LA-ICP-MS	文献[33]
6	Sample-5	43°07'30″	119°01'49″	勃隆克	花岗岩	134.9±4.1	LA-ICP-MS	文献[31]
7	WB08-N8	42°20'10″	144°55'05″	白旗	花岗斑岩	134.6±1.1	LA-ICP-MS	文献[52]
8	BQ-05	—	—	伊和	花岗斑岩	135.8±1.0	LA-ICP-MS	文献[34]
9	BQ-07	—	—	三面井	正长花岗岩	136.8±1.0	LA-ICP-MS	文献[34]
10	BQ-04	—	—	八一牧场	似斑状花岗岩	138.8±1.0	LA-ICP-MS	文献[34]
11	BQ-06	—	—	食品牧场	二长花岗岩	139.0±1.3	LA-ICP-MS	文献[34]
12	DB1901-7	42°23'16″	114°47'41″	都比	花岗斑岩	128.8±0.8	LA-ICP-MS	文献[54]
13	DB1901-2	42°23'8″	114°47'39″	都比	石英斑岩	127.8±2.1	LA-ICP-MS	文献[54]
火山岩
1	N3	—	—	羊盘沟	流纹斑岩	144.2±0.6	LA-ICP-MS	文献[20]
2	TW01	—	—	多伦县	石英粗面岩	144.2±0.4	LA-ICP-MS	文献[33]
3	HB14-454	42°18'14″	115°41'13″	正蓝旗	霏细碎斑熔岩	141.6±0.6	LA-ICP-MS	文献[36]
4	N-1	—	—	正蓝旗丹金	流纹斑岩	141.5±0.5	LA-ICP-MS	文献[89]
5	HB14-449	42°15'12″	115°44'44″	正蓝旗	流纹岩	141.4±0.7	LA-ICP-MS	文献[36]

Fig.10 Schematic tectonic evolution of the middle area of the northern margin of North China Plate during early Early Cretaceous (modified after ref.[12])

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