Geochemistry and Tectonic Significance of the Weijing Pluton in Airgin Sum Area, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2021.148

Abstract

Abstract:

Airgin Sum area is located in north of the Paleozoic Solonker-Xar Moron suture zone, and is a key region for studying the Xing-Meng orogenic belt. Many previous studies were focused on the Paleozoic tectonic evolution, magmatic rocks and sedimentary rocks. However, few studies were dedicated to the Early Mesozoic magmatic rocks. In this study, the Weijing pluton was selected for detailed petrological, geochemical and geochronological analyses. The results show that the Weijing moyite was formed in the Early Cretaceous (144.7 Ma). The moyite is subalkaline metaluminous, high-K calc alkaline, rich in Si and alkali, relatively rich in Fe but poor in Mg, Ca, and Al, showing A-type granite geochemical characteristics. The low (⁸⁷Sr/⁸⁶Sr)_ibut, high ε_Nd(t) and ε_Hf(t) values of the Weijing moyite indicate that it was derived mainly from the juvenile accreted crust from the depleted mantle. The Weijing moyite was likely formed in an intraplate extensional environment.

Key words: moyite, geochemistry, geochronology, Weijing pluton, Airgin Sum, Inner Mongolia

CLC Number:

LIU Jinbao, ZHU Luoting, LI Longxue, HOU Qingye. Geochemistry and Tectonic Significance of the Weijing Pluton in Airgin Sum Area, Inner Mongolia[J]. Geoscience, 2023, 37(02): 419-432.

Figures/Tables 19

Fig.1 Simplified geologic map of the Weijing pluton(modified from 1：200000, regional geologic map)

Fig.2 Thin-section microscopicphotos of the Weijing moyite

Fig.3 Zircon cathodoluminescence (CL) images (a), U-Pb concordia diagram (b) and weighted average histogram (c) of the Weijing moyite

Table 1 Zircon U-Pb dating results of the Weijing moyite (sample NMD33)

测点	含量(10^-6)			Th/U	同位素比值				年龄(Ma)
测点	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
1	8.4	63.5	141	0.45	0.05161±0.00318	0.16298±0.00918	0.02349±0.00034	333.39±173.13		153.31±8.01	149.66±2.15
2	12.6	89.8	233	0.39	0.04912±0.00229	0.15919±0.00722	0.02379±0.00031	153.79±111.10		149.99±6.32	151.56±1.93
3	24.1	185.0	381	0.49	0.04937±0.00211	0.15630±0.00687	0.02294±0.00026	164.90±99.99		147.46±6.03	146.18±1.64
4	20.8	185.0	275	0.67	0.05170±0.00248	0.15245±0.00724	0.02164±0.00032	272.29±111.10		144.07±6.38	137.99±1.99
5	14.1	132.0	108	1.22	0.05761±0.00399	0.17408±0.01164	0.02276±0.00043	516.71±153.68		162.95±10.06	145.10±2.69
6	20.8	170.0	316	0.54	0.04916±0.00206	0.14998±0.00620	0.02237±0.00024	153.79±98.13		141.90±5.48	142.62±1.49
7	22.8	162.0	451	0.36	0.04940±0.00180	0.16477±0.00622	0.02417±0.00027	168.60±85.17		154.87±5.42	153.97±1.71
8	48.9	344.0	886	0.39	0.05293±0.00130	0.16334±0.00396	0.02236±0.00016	324.13±27.78		153.63±3.46	142.56±1.04
11	11.5	92.2	174	0.53	0.04915±0.00295	0.15434±0.00906	0.02301±0.00033	153.79±145.35		145.73±7.97	146.63±2.06
12	20.9	167.0	352	0.47	0.04876±0.00211	0.15156±0.00613	0.02270±0.00027	200.08±101.84		143.29±5.41	144.71±1.72
14	8.10	63.8	124	0.52	0.05240±0.00311	0.16218±0.00966	0.02250±0.00033	301.91±135.17		152.61±8.44	143.41±2.06
15	18.7	137.0	307	0.45	0.04824±0.00216	0.15479±0.00657	0.02332±0.00023	109.35±93.51		146.13±5.77	148.63±1.42
17	13.9	87.9	300	0.29	0.04635±0.00204	0.14742±0.00643	0.02298±0.00023	16.77±99.99		139.63±5.69	146.48±1.47
18	12.1	86.7	197	0.44	0.05065±0.00256	0.15458±0.00785	0.02226±0.00026	233.40±118.50		145.95±6.91	141.94±1.65
19	12.2	88.2	201	0.44	0.05516±0.00272	0.17297±0.00830	0.02306±0.00034	420.42±109.25		162.00±7.18	146.95±2.14
20	11.1	90.4	135	0.67	0.06122±0.00438	0.18870±0.01239	0.02298±0.00039	655.57±153.68		175.52±10.58	146.45±2.46
21	15.3	133.0	163	0.81	0.05117±0.00311	0.16040±0.00950	0.02289±0.00035	255.62±140.72		151.06±8.32	145.93±2.20
23	15.0	119.0	193	0.62	0.05260±0.00280	0.15851±0.00805	0.02241±0.00031	322.28±120.35		149.40±7.06	142.87±1.96
25	35.9	257.0	498	0.52	0.05035±0.00192	0.16005±0.00599	0.02318±0.00023	209.33±88.88		150.75±5.24	147.75±1.43

Table 1 Zircon U-Pb dating results of the Weijing moyite (sample NMD33)

测点	含量(10^-6)			Th/U	同位素比值				年龄(Ma)
测点	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ		²⁰⁷Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ
1	8.4	63.5	141	0.45	0.05161±0.00318	0.16298±0.00918	0.02349±0.00034	333.39±173.13		153.31±8.01	149.66±2.15
2	12.6	89.8	233	0.39	0.04912±0.00229	0.15919±0.00722	0.02379±0.00031	153.79±111.10		149.99±6.32	151.56±1.93
3	24.1	185.0	381	0.49	0.04937±0.00211	0.15630±0.00687	0.02294±0.00026	164.90±99.99		147.46±6.03	146.18±1.64
4	20.8	185.0	275	0.67	0.05170±0.00248	0.15245±0.00724	0.02164±0.00032	272.29±111.10		144.07±6.38	137.99±1.99
5	14.1	132.0	108	1.22	0.05761±0.00399	0.17408±0.01164	0.02276±0.00043	516.71±153.68		162.95±10.06	145.10±2.69
6	20.8	170.0	316	0.54	0.04916±0.00206	0.14998±0.00620	0.02237±0.00024	153.79±98.13		141.90±5.48	142.62±1.49
7	22.8	162.0	451	0.36	0.04940±0.00180	0.16477±0.00622	0.02417±0.00027	168.60±85.17		154.87±5.42	153.97±1.71
8	48.9	344.0	886	0.39	0.05293±0.00130	0.16334±0.00396	0.02236±0.00016	324.13±27.78		153.63±3.46	142.56±1.04
11	11.5	92.2	174	0.53	0.04915±0.00295	0.15434±0.00906	0.02301±0.00033	153.79±145.35		145.73±7.97	146.63±2.06
12	20.9	167.0	352	0.47	0.04876±0.00211	0.15156±0.00613	0.02270±0.00027	200.08±101.84		143.29±5.41	144.71±1.72
14	8.10	63.8	124	0.52	0.05240±0.00311	0.16218±0.00966	0.02250±0.00033	301.91±135.17		152.61±8.44	143.41±2.06
15	18.7	137.0	307	0.45	0.04824±0.00216	0.15479±0.00657	0.02332±0.00023	109.35±93.51		146.13±5.77	148.63±1.42
17	13.9	87.9	300	0.29	0.04635±0.00204	0.14742±0.00643	0.02298±0.00023	16.77±99.99		139.63±5.69	146.48±1.47
18	12.1	86.7	197	0.44	0.05065±0.00256	0.15458±0.00785	0.02226±0.00026	233.40±118.50		145.95±6.91	141.94±1.65
19	12.2	88.2	201	0.44	0.05516±0.00272	0.17297±0.00830	0.02306±0.00034	420.42±109.25		162.00±7.18	146.95±2.14
20	11.1	90.4	135	0.67	0.06122±0.00438	0.18870±0.01239	0.02298±0.00039	655.57±153.68		175.52±10.58	146.45±2.46
21	15.3	133.0	163	0.81	0.05117±0.00311	0.16040±0.00950	0.02289±0.00035	255.62±140.72		151.06±8.32	145.93±2.20
23	15.0	119.0	193	0.62	0.05260±0.00280	0.15851±0.00805	0.02241±0.00031	322.28±120.35		149.40±7.06	142.87±1.96
25	35.9	257.0	498	0.52	0.05035±0.00192	0.16005±0.00599	0.02318±0.00023	209.33±88.88		150.75±5.24	147.75±1.43

Table 2 Contents of major elements(%) of the Weijing pluton

样品编号	岩性	SiO₂	TiO₂	Al₂O₃	^TFe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI
NMD34	钾长花岗岩	75.66	0.18	12.24	1.00	0.26	0.02	0.20	0.62	3.84	5.08	0.06	0.55
NMD35	钾长花岗岩	75.04	0.20	12.58	1.19	0.26	0.02	0.22	0.74	3.89	5.12	0.06	0.57
NMD36	钾长花岗岩	74.03	0.31	12.58	1.84	0.71	0.04	0.34	0.80	3.90	5.01	0.11	0.51
NMD37	钾长花岗岩	75.37	0.17	12.80	0.83	0.19	0.01	0.13	0.53	3.90	5.36	0.05	0.45
NMD38	钾长花岗岩	76.38	0.10	12.28	0.64	0.13	0.01	0.11	0.50	3.35	5.88	0.03	0.56
NMD39	钾长花岗岩	76.09	0.08	12.36	0.77	0.32	0.02	0.14	0.37	3.31	6.09	0.04	0.61
NMD40	钾长花岗岩	75.91	0.19	12.25	1.20	0.39	0.02	0.21	0.74	3.73	5.00	0.07	0.51
NMD41	钾长花岗岩	73.27	0.28	13.08	1.66	0.39	0.03	0.26	0.80	3.86	5.54	0.10	0.67
样品编号	岩性	总量	Na₂O+ K₂O	K₂O/ Na₂O	A/NK	A/CNK	AI	AR	SI	DI	σ	Mg^#	FeO^T/(FeO^T+ MgO)
NMD34	钾长花岗岩	99.45	8.92	1.32	1.04	0.95	0.97	3.97	1.93	95.84	2.44	57.83	0.85
NMD35	钾长花岗岩	99.63	9.01	1.32	1.05	0.95	0.95	3.81	2.07	95.01	2.53	60.13	0.86
NMD36	钾长花岗岩	99.47	8.91	1.28	1.06	0.95	0.94	3.80	2.90	92.97	2.56	46.05	0.87
NMD37	钾长花岗岩	99.60	9.26	1.37	1.05	0.97	0.95	3.82	1.25	96.29	2.65	54.95	0.88
NMD38	钾长花岗岩	99.84	9.23	1.76	1.03	0.96	0.97	3.20	1.09	97.01	2.55	60.13	0.87
NMD39	钾长花岗岩	99.88	9.40	1.84	1.03	0.97	0.97	3.17	1.32	96.94	2.67	43.82	0.88
NMD40	钾长花岗岩	99.84	8.73	1.34	1.06	0.95	0.94	3.70	2.00	94.75	2.32	48.98	0.88
NMD41	钾长花岗岩	99.55	9.40	1.44	1.06	0.95	0.94	3.51	2.23	93.85	2.92	54.30	0.88

Fig.4 A/CNK-A/NK plot for the Weijing pluton

Fig.5 SiO2-FeOT/(FeOT+MgO) (a) and SiO2-(Na2O+K2O-CaO) (b) plots for the Weijing pluton

Fig.6 TAS diagram (a) and SiO2-K2O plot (b) for the Weijing moyite

Fig.7 Harker diagrams of the Weijing moyite

Table 3 Contents of trace elements(10-6) and REEs(10-6) of the Weijing pluton

样品编号	Ag	As	Au	B	Ba	Be	Bi	Br	Cd	Cl	Co	Cr	Cs
NMD34	0.042	1.70	0.17	7.19	388	7.29	0.108	0.6	0.023	71	1.51	12.2	8.11
NMD35	0.038	1.68	0.17	6.27	349	6.55	0.270	0.4	0.030	57	1.13	13.4	8.54
NMD36	0.033	1.64	0.16	5.94	363	8.44	0.365	0.8	0.030	83	2.36	14.7	11.05
NMD37	0.063	0.61	0.15	7.64	437	5.43	0.140	0.7	0.030	52	0.59	11.3	7.61
NMD38	0.095	0.50	0.18	4.41	225	3.25	0.090	0.6	0.030	52	0.67	10.9	5.88
NMD39	0.064	1.39	1.06	5.34	411	2.72	0.176	0.7	0.040	42	0.56	10.9	4.75
NMD40	0.041	1.24	0.22	5.73	418	4.95	0.138	0.2	0.040	49	1.29	10.9	4.59
NMD41	0.036	2.21	0.24	8.11	473	6.67	0.490	0.6	0.040	53	2.06	13.8	14.66
样品编号	Cu	F	Ga	Ge	Hf	Hg	I	In	Li	Mo	N	Nb	Ni
NMD34	4.07	570	18.6	1.30	2.73	7.75	0.41	0.021	32.11	0.55	111	14.6	3.86
NMD35	3.90	868	20.3	1.13	3.52	8.00	0.34	0.030	44.52	0.25	111	21.3	5.81
NMD36	4.05	746	20.0	1.51	4.78	8.21	0.37	0.040	49.83	1.62	97	28.0	4.19
NMD37	2.95	555	19.3	1.13	2.94	8.27	0.47	0.020	16.91	0.31	97	15.9	5.88
NMD38	3.24	206	16.0	0.91	2.03	5.91	0.41	0.010	3.74	0.38	97	6.6	5.77
NMD39	8.73	196	13.8	1.01	1.68	6.15	0.49	0.020	4.99	0.61	97	7.5	5.61
NMD40	4.84	651	17.8	1.16	3.13	7.81	0.41	0.020	22.38	1.31	111	16.6	5.39
NMD41	5.16	584	19.1	1.30	4.03	7.03	0.37	0.030	34.09	1.07	111	22.6	3.93
样品编号	Pb	Rb	S	Sb	Sc	Se	Sn	Sr	Ta	Te	Th	Tl	U
NMD34	27.35	263	57	0.078	1.79	0.028	3.25	142	2.02	0.024	24.04	1.35	1.33
NMD35	32.19	290	61	0.119	1.71	0.031	3.69	133	1.65	0.020	25.46	1.55	1.28
NMD36	35.10	293	99	0.231	2.76	0.036	5.30	147	2.59	0.030	43.02	1.48	3.91
NMD37	27.01	266	61	0.131	1.28	0.026	3.53	158	1.25	0.020	18.94	1.19	1.39
NMD38	41.41	207	74	0.051	1.37	0.027	1.63	92	0.58	0.010	48.19	1.08	2.63
NMD39	30.46	203	90	0.072	1.78	0.112	2.28	73	0.65	0.020	19.62	1.04	2.00
NMD40	22.55	237	63	0.087	1.44	0.029	2.94	164	1.77	0.020	21.80	1.05	2.68
NMD41	31.01	268	84	0.156	2.49	0.045	3.63	171	2.71	0.020	33.60	1.38	2.99
样品编号	V	W	Zn	Zr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy
NMD34	11	0.81	25	115	19.08	41.40	3.72	12.36	2.01	0.61	1.89	0.29	1.59
NMD35	16	1.33	33	144	19.45	33.97	3.81	12.93	2.20	0.59	1.97	0.30	1.67
NMD36	17	0.25	43	201	26.78	80.88	6.35	22.26	4.00	0.70	3.54	0.56	2.97
NMD37	13	1.12	23	121	19.49	35.41	3.75	12.42	1.93	0.51	1.72	0.23	1.12
NMD38	4	0.37	12	92	25.81	48.62	4.25	13.29	1.88	0.44	1.67	0.18	0.73
NMD39	9	0.66	17	70	7.85	17.74	1.50	5.30	1.04	0.45	1.02	0.18	1.12
NMD40	16	0.85	28	143	27.93	66.27	5.76	19.59	3.22	0.59	2.94	0.42	2.11
NMD41	20	2.26	34	184	34.70	75.31	7.57	25.97	4.42	0.82	3.94	0.58	3.01
样品编号	Ho	Er	Tm	Yb	Lu	Y	10000(Ga/ Al)	∑REE	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	(Gd/ Yb)_N	δEu
NMD34	0.32	0.99	0.17	1.18	0.19	9.34	2.87	85.80	11.96	11.60	6.13	1.33	0.94
NMD35	0.35	1.07	0.18	1.25	0.20	10.75	3.05	79.94	10.44	11.16	5.71	1.30	0.85
NMD36	0.59	1.79	0.29	2.01	0.32	17.10	3.00	153.04	11.68	9.56	4.32	1.46	0.56
NMD37	0.21	0.64	0.10	0.69	0.11	6.33	2.85	78.33	15.25	20.26	6.52	2.06	0.84
NMD38	0.14	0.44	0.07	0.47	0.08	4.16	2.46	98.07	24.94	39.39	8.86	2.94	0.74
NMD39	0.24	0.74	0.13	0.90	0.14	6.67	2.11	38.35	7.58	6.26	4.87	0.94	1.32
NMD40	0.41	1.23	0.19	1.30	0.19	12.28	2.74	132.15	14.03	15.41	5.60	1.87	0.58
NMD41	0.59	1.74	0.28	1.86	0.28	16.97	2.76	161.07	12.12	13.38	5.07	1.75	0.59

Table 3 Contents of trace elements(10-6) and REEs(10-6) of the Weijing pluton

样品编号	Ag	As	Au	B	Ba	Be	Bi	Br	Cd	Cl	Co	Cr	Cs
NMD34	0.042	1.70	0.17	7.19	388	7.29	0.108	0.6	0.023	71	1.51	12.2	8.11
NMD35	0.038	1.68	0.17	6.27	349	6.55	0.270	0.4	0.030	57	1.13	13.4	8.54
NMD36	0.033	1.64	0.16	5.94	363	8.44	0.365	0.8	0.030	83	2.36	14.7	11.05
NMD37	0.063	0.61	0.15	7.64	437	5.43	0.140	0.7	0.030	52	0.59	11.3	7.61
NMD38	0.095	0.50	0.18	4.41	225	3.25	0.090	0.6	0.030	52	0.67	10.9	5.88
NMD39	0.064	1.39	1.06	5.34	411	2.72	0.176	0.7	0.040	42	0.56	10.9	4.75
NMD40	0.041	1.24	0.22	5.73	418	4.95	0.138	0.2	0.040	49	1.29	10.9	4.59
NMD41	0.036	2.21	0.24	8.11	473	6.67	0.490	0.6	0.040	53	2.06	13.8	14.66
样品编号	Cu	F	Ga	Ge	Hf	Hg	I	In	Li	Mo	N	Nb	Ni
NMD34	4.07	570	18.6	1.30	2.73	7.75	0.41	0.021	32.11	0.55	111	14.6	3.86
NMD35	3.90	868	20.3	1.13	3.52	8.00	0.34	0.030	44.52	0.25	111	21.3	5.81
NMD36	4.05	746	20.0	1.51	4.78	8.21	0.37	0.040	49.83	1.62	97	28.0	4.19
NMD37	2.95	555	19.3	1.13	2.94	8.27	0.47	0.020	16.91	0.31	97	15.9	5.88
NMD38	3.24	206	16.0	0.91	2.03	5.91	0.41	0.010	3.74	0.38	97	6.6	5.77
NMD39	8.73	196	13.8	1.01	1.68	6.15	0.49	0.020	4.99	0.61	97	7.5	5.61
NMD40	4.84	651	17.8	1.16	3.13	7.81	0.41	0.020	22.38	1.31	111	16.6	5.39
NMD41	5.16	584	19.1	1.30	4.03	7.03	0.37	0.030	34.09	1.07	111	22.6	3.93
样品编号	Pb	Rb	S	Sb	Sc	Se	Sn	Sr	Ta	Te	Th	Tl	U
NMD34	27.35	263	57	0.078	1.79	0.028	3.25	142	2.02	0.024	24.04	1.35	1.33
NMD35	32.19	290	61	0.119	1.71	0.031	3.69	133	1.65	0.020	25.46	1.55	1.28
NMD36	35.10	293	99	0.231	2.76	0.036	5.30	147	2.59	0.030	43.02	1.48	3.91
NMD37	27.01	266	61	0.131	1.28	0.026	3.53	158	1.25	0.020	18.94	1.19	1.39
NMD38	41.41	207	74	0.051	1.37	0.027	1.63	92	0.58	0.010	48.19	1.08	2.63
NMD39	30.46	203	90	0.072	1.78	0.112	2.28	73	0.65	0.020	19.62	1.04	2.00
NMD40	22.55	237	63	0.087	1.44	0.029	2.94	164	1.77	0.020	21.80	1.05	2.68
NMD41	31.01	268	84	0.156	2.49	0.045	3.63	171	2.71	0.020	33.60	1.38	2.99
样品编号	V	W	Zn	Zr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy
NMD34	11	0.81	25	115	19.08	41.40	3.72	12.36	2.01	0.61	1.89	0.29	1.59
NMD35	16	1.33	33	144	19.45	33.97	3.81	12.93	2.20	0.59	1.97	0.30	1.67
NMD36	17	0.25	43	201	26.78	80.88	6.35	22.26	4.00	0.70	3.54	0.56	2.97
NMD37	13	1.12	23	121	19.49	35.41	3.75	12.42	1.93	0.51	1.72	0.23	1.12
NMD38	4	0.37	12	92	25.81	48.62	4.25	13.29	1.88	0.44	1.67	0.18	0.73
NMD39	9	0.66	17	70	7.85	17.74	1.50	5.30	1.04	0.45	1.02	0.18	1.12
NMD40	16	0.85	28	143	27.93	66.27	5.76	19.59	3.22	0.59	2.94	0.42	2.11
NMD41	20	2.26	34	184	34.70	75.31	7.57	25.97	4.42	0.82	3.94	0.58	3.01
样品编号	Ho	Er	Tm	Yb	Lu	Y	10000(Ga/ Al)	∑REE	LREE/ HREE	(La/ Yb)_N	(La/ Sm)_N	(Gd/ Yb)_N	δEu
NMD34	0.32	0.99	0.17	1.18	0.19	9.34	2.87	85.80	11.96	11.60	6.13	1.33	0.94
NMD35	0.35	1.07	0.18	1.25	0.20	10.75	3.05	79.94	10.44	11.16	5.71	1.30	0.85
NMD36	0.59	1.79	0.29	2.01	0.32	17.10	3.00	153.04	11.68	9.56	4.32	1.46	0.56
NMD37	0.21	0.64	0.10	0.69	0.11	6.33	2.85	78.33	15.25	20.26	6.52	2.06	0.84
NMD38	0.14	0.44	0.07	0.47	0.08	4.16	2.46	98.07	24.94	39.39	8.86	2.94	0.74
NMD39	0.24	0.74	0.13	0.90	0.14	6.67	2.11	38.35	7.58	6.26	4.87	0.94	1.32
NMD40	0.41	1.23	0.19	1.30	0.19	12.28	2.74	132.15	14.03	15.41	5.60	1.87	0.58
NMD41	0.59	1.74	0.28	1.86	0.28	16.97	2.76	161.07	12.12	13.38	5.07	1.75	0.59

Fig.8 Primitive mantle-normalized multi-element spidergram (a) and chondrite-normalized REE pattern (b) for the Weijing moyite

Table 4 Zircon Sr-Nd-Pb isotopic data of the Weijing moyite

样品编号	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr±1σ	I_sr	Sm(10^-6)	Nd(10^-6)
NMD34	259	135.0	5.5648	0.716196±0.000014	0.70467	1.87	11.30
NMD37	229	140.0	4.7430	0.715070±0.000015	0.70525	2.32	14.80
NMD38	189	85.2	6.4136	0.718874±0.000010	0.70559	1.93	13.70
NMD39	175	63.0	8.0436	0.734466±0.000011	0.71781	1.04	5.22
NMD40	207	149.0	4.0181	0.713517±0.000012	0.70520	3.62	21.80
样品编号	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd±1σ	ε_Nd(t)	T_DM(Ga)	²⁰⁶Pb/²⁰⁴Pb±1σ	²⁰⁷Pb/²⁰⁴Pb±1σ	²⁰⁸Pb/²⁰⁴Pb±1σ
NMD34	0.0998	0.512547±0.000008	0	0.8	18.654±0.001	15.580±0.001	38.565±0.002
NMD37	0.0948	0.512594±0.000009	1.0	0.7	18.552±0.001	15.573±0.001	38.527±0.002
NMD38	0.0853	0.512515±0.000009	-0.3	0.8	18.644±0.001	15.577±0.001	38.729±0.002
NMD39	0.1204	0.512505±0.000012	-1.2	1.1	18.971±0.001	15.611±0.001	38.761±0.002
NMD40	0.1004	0.512565±0.000010	0.4	0.8	18.747±0.001	15.582±0.001	38.742±0.002

Table 5 LA-ICP-MS zircon Hf isotopic data of the Weijing moyite (sample NMD33)

测点	年龄 (Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	(¹⁷⁶Hf/ ¹⁷⁷Hf)_t	ε_Hf(0)	ε_Hf(t)±1σ	T_DM (Ga)	$T D M C 1$ (Ga)	$T D M C 2$ (Ga)	f_Lu/Hf
1	150	0.040681	0.000850	0.282875±0.000015	0.282873	3.64	6.85±0.531382	0.5	0.8	1.0	-0.97
2	151	0.048192	0.001020	0.282882±0.000016	0.282880	3.90	7.12±0.574658	0.5	0.7	1.0	-0.97
3	146	0.046674	0.000996	0.282864±0.000017	0.282861	3.24	6.35±0.585285	0.6	0.8	1.1	-0.97
4	139	0.054542	0.001146	0.282918±0.000022	0.282915	5.18	8.12±0.786848	0.5	0.7	0.9	-0.97
5	141	0.043925	0.000935	0.282892±0.000017	0.282890	4.25	7.26±0.610297	0.5	0.7	1.0	-0.97
6	153	0.041276	0.000915	0.282867±0.000014	0.282865	3.37	6.63±0.495201	0.5	0.8	1.0	-0.97
7	144	0.033799	0.000759	0.282864±0.000014	0.282862	3.25	6.33±0.495157	0.5	0.8	1.1	-0.98
8	147	0.036875	0.000822	0.282831±0.000014	0.282829	2.10	5.25±0.507896	0.6	0.9	1.2	-0.98
9	145	0.053808	0.001260	0.282838±0.000014	0.282834	2.32	5.38±0.500665	0.6	0.9	1.1	-0.96
10	136	0.037200	0.000825	0.282891±0.000017	0.282889	4.20	7.11±0.613400	0.5	0.7	1.0	-0.98
11	144	0.039660	0.000897	0.282881±0.000012	0.282879	3.86	6.94±0.424810	0.5	0.8	1.0	-0.97
12	149	0.067365	0.001483	0.282925±0.000020	0.282921	5.41	8.53±0.702122	0.5	0.7	0.9	-0.96
13	136	0.055280	0.001205	0.282864±0.000014	0.282861	3.26	6.13±0.485738	0.6	0.8	1.1	-0.96
14	147	0.046979	0.000978	0.282869±0.000015	0.282866	3.41	6.54±0.543601	0.5	0.8	1.0	-0.97
15	142	0.047522	0.000990	0.282851±0.000018	0.282848	2.79	5.81±0.634994	0.6	0.8	1.1	-0.97
16	146	0.055938	0.001138	0.282896±0.000019	0.282892	4.37	7.46±0.675875	0.5	0.7	1.0	-0.97
17	146	0.044908	0.001246	0.282884±0.000015	0.282881	3.97	7.05±0.527123	0.5	0.7	1.0	-0.96
18	146	0.046268	0.001052	0.282897±0.000019	0.282895	4.44	7.54±0.658308	0.5	0.7	1.0	-0.97
19	143	0.036141	0.000792	0.282845±0.000016	0.282843	2.58	5.64±0.564761	0.6	0.8	1.1	-0.98

Table 5 LA-ICP-MS zircon Hf isotopic data of the Weijing moyite (sample NMD33)

测点	年龄 (Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf±2σ	(¹⁷⁶Hf/ ¹⁷⁷Hf)_t	ε_Hf(0)	ε_Hf(t)±1σ	T_DM (Ga)	$T D M C 1$ (Ga)	$T D M C 2$ (Ga)	f_Lu/Hf
1	150	0.040681	0.000850	0.282875±0.000015	0.282873	3.64	6.85±0.531382	0.5	0.8	1.0	-0.97
2	151	0.048192	0.001020	0.282882±0.000016	0.282880	3.90	7.12±0.574658	0.5	0.7	1.0	-0.97
3	146	0.046674	0.000996	0.282864±0.000017	0.282861	3.24	6.35±0.585285	0.6	0.8	1.1	-0.97
4	139	0.054542	0.001146	0.282918±0.000022	0.282915	5.18	8.12±0.786848	0.5	0.7	0.9	-0.97
5	141	0.043925	0.000935	0.282892±0.000017	0.282890	4.25	7.26±0.610297	0.5	0.7	1.0	-0.97
6	153	0.041276	0.000915	0.282867±0.000014	0.282865	3.37	6.63±0.495201	0.5	0.8	1.0	-0.97
7	144	0.033799	0.000759	0.282864±0.000014	0.282862	3.25	6.33±0.495157	0.5	0.8	1.1	-0.98
8	147	0.036875	0.000822	0.282831±0.000014	0.282829	2.10	5.25±0.507896	0.6	0.9	1.2	-0.98
9	145	0.053808	0.001260	0.282838±0.000014	0.282834	2.32	5.38±0.500665	0.6	0.9	1.1	-0.96
10	136	0.037200	0.000825	0.282891±0.000017	0.282889	4.20	7.11±0.613400	0.5	0.7	1.0	-0.98
11	144	0.039660	0.000897	0.282881±0.000012	0.282879	3.86	6.94±0.424810	0.5	0.8	1.0	-0.97
12	149	0.067365	0.001483	0.282925±0.000020	0.282921	5.41	8.53±0.702122	0.5	0.7	0.9	-0.96
13	136	0.055280	0.001205	0.282864±0.000014	0.282861	3.26	6.13±0.485738	0.6	0.8	1.1	-0.96
14	147	0.046979	0.000978	0.282869±0.000015	0.282866	3.41	6.54±0.543601	0.5	0.8	1.0	-0.97
15	142	0.047522	0.000990	0.282851±0.000018	0.282848	2.79	5.81±0.634994	0.6	0.8	1.1	-0.97
16	146	0.055938	0.001138	0.282896±0.000019	0.282892	4.37	7.46±0.675875	0.5	0.7	1.0	-0.97
17	146	0.044908	0.001246	0.282884±0.000015	0.282881	3.97	7.05±0.527123	0.5	0.7	1.0	-0.96
18	146	0.046268	0.001052	0.282897±0.000019	0.282895	4.44	7.54±0.658308	0.5	0.7	1.0	-0.97
19	143	0.036141	0.000792	0.282845±0.000016	0.282843	2.58	5.64±0.564761	0.6	0.8	1.1	-0.98

Fig.9 Zircon Hf isotopic composition histogram (a) and Hf single-stage model age histogram (b)for the Cretaceous Weijing moyite

Fig.10 Major element A-type granite discrimination plots for the Weijing moyite

Fig.11 Trace element A-type granite discrimination plots for the Weijing moyite

Fig.12 A1 and A2-type granite discrimination diagrams of the Weijing moyite

Fig.13 (87Sr/86Sr)i-εNd(t) plot of the Weijing pluton

Fig.14 t-εHf(t) plot of the Weijing moyite

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