Chronology and Geochemical Characteristics of Granitic Gneiss in Xiaoqinling District on the Southern Margin of North China Craton and Its Significance

doi:10.19657/j.geoscience.1000-8527.2021.121

Abstract

Abstract:

The Xiaoqinling district, located in the southern end of the Trans-North China Orogen, is important for constraining the Proterozoic evolution of the southern margin of the North China Craton (NCC), and the collision timing of the eastern and western NCC blocks. SIMS zircon dating of the granitic gneiss from the Dahu Au-Mo deposit in the Xiaoqinling district yielded a concordant age of (2,455±59) Ma (magmatic zircons) and(1,821±31) Ma (metamorphic zircons). Whole-rock geochemistry shows that the granitic gneiss has high contents of SiO₂, total-alkali, and low Al₂O₃, CaO, MgO, and P₂O₅. Additionally, the rocks show enrichment in LILEs (Rb, Th, K) and depletion in HFSEs (Nb), Sr, P, and Ti. Combined with the A/CNK-A/NK discrimination and the Ga-Rb compositional features, we conclude that the protolith of the granitic gneiss is A1-type granites formed in a non-collisional environment. This implies that the A-type granites in the Dahu Au-Mo deposit were dominantly derived from partial melting of the Meso-Neoarchean crystalline basement caused by the early Paleoproterozoic mafic magma underplating in an intracontinental rift setting. In the late Paleoproterozoic, the region may have been affected by post-orogenic extension of the eastern and western NCC blocks.

Key words: granitic gneiss, SIMS zircon U-Pb dating, A-type granite, tectonic setting, Xiaoqinling

CLC Number:

XIE Gen, YU Guangming, LU Yingchuan, FENG Xin, TIAN Guanghao, WANG Ran, WANG Jian. Chronology and Geochemical Characteristics of Granitic Gneiss in Xiaoqinling District on the Southern Margin of North China Craton and Its Significance[J]. Geoscience, 2021, 35(06): 1702-1712.

Figures/Tables 9

References 43

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测试点号	分组	含量/10^-6		Th/U	同位素比值 ±1σ			(年龄±1σ)/Ma
测试点号	分组	U	Th	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U
1	Ⅰ	250	106	0.42	0.160 5±0.5	10.404 9±1.6	0.470 3±1.6	2 460.4±8.2	2 471.5±15.2	2 484.9±32.2
2	Ⅰ	323	100	0.31	0.162 5±0.4	10.281 9±1.5	0.458 8±1.5	2 482.3±6.2	2 460.5±14.4	2 434.1±30.5
6	Ⅰ	409	140	0.34	0.155 5±0.4	9.555 9±1.6	0.445 8±1.5	2 407.0±7.3	2 392.9±14.5	2 376.4±29.9
14	Ⅰ	464	146	0.31	0.155 6±0.4	9.774 0±1.5	0.455 4±1.5	2 408.9±6.3	2 413.7±14.4	2 419.4±30.4
17	Ⅰ	425	93	0.22	0.155 3±0.4	9.074 7±1.6	0.423 7±1.5	2 405.5±7.1	2 345.6±14.4	2 277.3±28.9
7	?	582	556	0.96	0.119 9±0.4	5.950 0±1.5	0.359 8±1.5	1 955.3±6.4	1 968.6±13.5	1 981.2±25.6
16	?	1 544	222	0.14	0.136 3±0.2	7.677 4±1.5	0.408 5±1.5	2 180.7±3.5	2 194.0±13.7	2 208.2±28.1
15	Ⅱ	275	6	0.02	0.114 1±0.5	5.270 5±1.6	0.335 1±1.5	1 865.0±9.1	1 864.1±13.6	1 863.3±24.3
3	Ⅱ	378	354	0.94	0.111 4±0.4	5.060 3±1.6	0.329 4±1.5	1 822.9±7.9	1 829.5±13.3	1 835.2±24.0
4	Ⅱ	1 075	1 565	1.46	0.111 4±0.3	5.054 3±1.5	0.328 9±1.5	1 823.1±4.6	1 828.5±13.0	1 833.2±24.0
5	Ⅱ	184	102	0.55	0.112 0±0.6	5.048 8±1.6	0.327 1±1.5	1 831.4±10.9	1 827.5±14.0	1 824.1±24.3
8	Ⅱ	552	513	0.93	0.111 2±0.5	5.105 3±1.6	0.332 9±1.5	1 819.6±8.7	1 837.0±13.5	1 852.4±24.2
9	Ⅱ	605	724	1.20	0.110 1±0.3	5.096 9±1.6	0.335 8±1.6	1 801.0±6.1	1 835.6±13.6	1 866.2±25.3
10	Ⅱ	729	735	1.01	0.111 5±0.3	5.083 7±1.5	0.330 7±1.5	1 824.0±5.5	1 833.4±13.2	1 841.7±24.3
11	Ⅱ	354	401	1.13	0.111 7±0.4	5.052 3±1.6	0.328 0±1.5	1 827.6±8.0	1 828.1±13.5	1 828.6±24.2
12	Ⅱ	811	811	1.00	0.112 1±0.3	5.211 9±1.5	0.337 4±1.5	1 832.9±5.8	1 854.6±13.2	1 873.9±24.4
13	Ⅱ	1 418	2 623	1.85	0.111 0±0.3	5.049 3±1.5	0.329 9±1.5	1 815.9±4.8	1 827.6±13.0	1 837.9±24.1
18	Ⅱ	689	868	1.26	0.111 5±0.3	5.338 6±1.5	0.347 1±1.5	1 824.7±6.3	1 875.1±13.3	1 920.8±25.0
19	Ⅱ	97	42	0.43	0.110 1±0.8	5.135 2±1.7	0.338 4±1.5	1 800.6±15.3	1 841.9±14.8	1 878.8±24.6
20	Ⅱ	1 144	1 692	1.48	0.111 9±0.2	5.119 8±1.5	0.331 9±1.5	1 829.9±4.5	1 839.4±13.0	1 847.8±24.2

测试点号	分组	含量/10^-6		Th/U	同位素比值 ±1σ			(年龄±1σ)/Ma
测试点号	分组	U	Th	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U
1	Ⅰ	250	106	0.42	0.160 5±0.5	10.404 9±1.6	0.470 3±1.6	2 460.4±8.2	2 471.5±15.2	2 484.9±32.2
2	Ⅰ	323	100	0.31	0.162 5±0.4	10.281 9±1.5	0.458 8±1.5	2 482.3±6.2	2 460.5±14.4	2 434.1±30.5
6	Ⅰ	409	140	0.34	0.155 5±0.4	9.555 9±1.6	0.445 8±1.5	2 407.0±7.3	2 392.9±14.5	2 376.4±29.9
14	Ⅰ	464	146	0.31	0.155 6±0.4	9.774 0±1.5	0.455 4±1.5	2 408.9±6.3	2 413.7±14.4	2 419.4±30.4
17	Ⅰ	425	93	0.22	0.155 3±0.4	9.074 7±1.6	0.423 7±1.5	2 405.5±7.1	2 345.6±14.4	2 277.3±28.9
7	?	582	556	0.96	0.119 9±0.4	5.950 0±1.5	0.359 8±1.5	1 955.3±6.4	1 968.6±13.5	1 981.2±25.6
16	?	1 544	222	0.14	0.136 3±0.2	7.677 4±1.5	0.408 5±1.5	2 180.7±3.5	2 194.0±13.7	2 208.2±28.1
15	Ⅱ	275	6	0.02	0.114 1±0.5	5.270 5±1.6	0.335 1±1.5	1 865.0±9.1	1 864.1±13.6	1 863.3±24.3
3	Ⅱ	378	354	0.94	0.111 4±0.4	5.060 3±1.6	0.329 4±1.5	1 822.9±7.9	1 829.5±13.3	1 835.2±24.0
4	Ⅱ	1 075	1 565	1.46	0.111 4±0.3	5.054 3±1.5	0.328 9±1.5	1 823.1±4.6	1 828.5±13.0	1 833.2±24.0
5	Ⅱ	184	102	0.55	0.112 0±0.6	5.048 8±1.6	0.327 1±1.5	1 831.4±10.9	1 827.5±14.0	1 824.1±24.3
8	Ⅱ	552	513	0.93	0.111 2±0.5	5.105 3±1.6	0.332 9±1.5	1 819.6±8.7	1 837.0±13.5	1 852.4±24.2
9	Ⅱ	605	724	1.20	0.110 1±0.3	5.096 9±1.6	0.335 8±1.6	1 801.0±6.1	1 835.6±13.6	1 866.2±25.3
10	Ⅱ	729	735	1.01	0.111 5±0.3	5.083 7±1.5	0.330 7±1.5	1 824.0±5.5	1 833.4±13.2	1 841.7±24.3
11	Ⅱ	354	401	1.13	0.111 7±0.4	5.052 3±1.6	0.328 0±1.5	1 827.6±8.0	1 828.1±13.5	1 828.6±24.2
12	Ⅱ	811	811	1.00	0.112 1±0.3	5.211 9±1.5	0.337 4±1.5	1 832.9±5.8	1 854.6±13.2	1 873.9±24.4
13	Ⅱ	1 418	2 623	1.85	0.111 0±0.3	5.049 3±1.5	0.329 9±1.5	1 815.9±4.8	1 827.6±13.0	1 837.9±24.1
18	Ⅱ	689	868	1.26	0.111 5±0.3	5.338 6±1.5	0.347 1±1.5	1 824.7±6.3	1 875.1±13.3	1 920.8±25.0
19	Ⅱ	97	42	0.43	0.110 1±0.8	5.135 2±1.7	0.338 4±1.5	1 800.6±15.3	1 841.9±14.8	1 878.8±24.6
20	Ⅱ	1 144	1 692	1.48	0.111 9±0.2	5.119 8±1.5	0.331 9±1.5	1 829.9±4.5	1 839.4±13.0	1 847.8±24.2

样品编号	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	MnO	P₂O₅	烧失量	总量	K₂O+ Na₂O	K₂O/ Na₂O	A/CNK	A/NK
F7-017	56.23	16.44	2.42	5.77	6.33	3.61	1.99	3.81	0.99	0.20	0.26	0.74	99.37	5.80	0.52	0.97	1.94
F7-037	75.99	12.91	0.18	0.48	1.28	0.20	3.57	4.02	0.11	0.02	0.01	0.50	99.32	7.59	0.89	1.00	1.15
F7-039	73.14	13.81	0.39	0.25	0.69	0.30	7.29	1.82	0.13	0.01	0.04	1.46	99.34	9.11	4.01	0.93	0.99
F7-040	71.53	13.20	1.76	0.25	0.94	0.08	8.29	1.24	0.13	0.01	0.02	1.90	99.37	9.53	6.69	0.83	0.90
样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	LREE/ HREE	REE	δEu
F7-017	25.49	65.06	9.26	38.43	8.04	1.55	7.35	1.26	7.93	1.65	4.74	0.74	4.99	0.78	5.02	177.27	0.62
F7-037	63.55	100.07	9.70	27.38	3.65	0.23	3.58	0.49	3.02	0.68	2.16	0.38	2.80	0.50	15.03	218.19	0.19
F7-039	65.90	127.69	13.11	37.69	4.43	0.80	3.09	0.30	0.93	0.13	0.28	0.04	0.22	0.03	49.75	254.63	0.66
F7-040	77.62	142.28	14.29	40.26	5.12	0.86	3.59	0.34	1.19	0.20	0.54	0.07	0.44	0.06	43.48	286.87	0.61
样品编号	Y	Zr	Hf	Rb	Sr	Nb	Ba	Ta	Th	Li	Be	Sc	Co	Ni	Cu	Zn	Ga
F7-017	42.04	133.31	4.06	97.98	217.41	11.14	267.83	0.83	7.69	31.08	2.04	22.65	20.35	8.79	6.76	104.14	20.06
F7-037	20.65	123.93	4.70	226.86	61.49	8.11	33.20	1.74	136.53	7.13	3.57	0.75	1.24	0.57	1.96	20.83	15.23
F7-039	3.67	115.17	3.78	138.84	261.11	4.13	1 248.52	0.19	18.82	3.48	0.96	1.67	2.22	1.33	5.58	10.45	16.48
F7-040	5.59	35.87	1.38	190.48	284.57	32.41	2 308.30	0.30	14.61	1.19	1.04	0.90	5.47	1.36	7.89	7.36	18.19
样品编号	Cs	Pb	U	Bi	V	Cr	Tl
F7-017	4.17	12.43	1.19	0.09	165.20	17.30	0.63
F7-037	11.74	30.06	17.89	6.45	8.95	1.76	0.66
F7-039	1.44	17.10	1.12	1.06	15.63	4.16	0.62
F7-040	1.27	15.42	0.91	3.77	11.03	1.87	0.72

样品编号	SiO₂	Al₂O₃	Fe₂O₃	FeO	CaO	MgO	K₂O	Na₂O	TiO₂	MnO	P₂O₅	烧失量	总量	K₂O+ Na₂O	K₂O/ Na₂O	A/CNK	A/NK
F7-017	56.23	16.44	2.42	5.77	6.33	3.61	1.99	3.81	0.99	0.20	0.26	0.74	99.37	5.80	0.52	0.97	1.94
F7-037	75.99	12.91	0.18	0.48	1.28	0.20	3.57	4.02	0.11	0.02	0.01	0.50	99.32	7.59	0.89	1.00	1.15
F7-039	73.14	13.81	0.39	0.25	0.69	0.30	7.29	1.82	0.13	0.01	0.04	1.46	99.34	9.11	4.01	0.93	0.99
F7-040	71.53	13.20	1.76	0.25	0.94	0.08	8.29	1.24	0.13	0.01	0.02	1.90	99.37	9.53	6.69	0.83	0.90
样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	LREE/ HREE	REE	δEu
F7-017	25.49	65.06	9.26	38.43	8.04	1.55	7.35	1.26	7.93	1.65	4.74	0.74	4.99	0.78	5.02	177.27	0.62
F7-037	63.55	100.07	9.70	27.38	3.65	0.23	3.58	0.49	3.02	0.68	2.16	0.38	2.80	0.50	15.03	218.19	0.19
F7-039	65.90	127.69	13.11	37.69	4.43	0.80	3.09	0.30	0.93	0.13	0.28	0.04	0.22	0.03	49.75	254.63	0.66
F7-040	77.62	142.28	14.29	40.26	5.12	0.86	3.59	0.34	1.19	0.20	0.54	0.07	0.44	0.06	43.48	286.87	0.61
样品编号	Y	Zr	Hf	Rb	Sr	Nb	Ba	Ta	Th	Li	Be	Sc	Co	Ni	Cu	Zn	Ga
F7-017	42.04	133.31	4.06	97.98	217.41	11.14	267.83	0.83	7.69	31.08	2.04	22.65	20.35	8.79	6.76	104.14	20.06
F7-037	20.65	123.93	4.70	226.86	61.49	8.11	33.20	1.74	136.53	7.13	3.57	0.75	1.24	0.57	1.96	20.83	15.23
F7-039	3.67	115.17	3.78	138.84	261.11	4.13	1 248.52	0.19	18.82	3.48	0.96	1.67	2.22	1.33	5.58	10.45	16.48
F7-040	5.59	35.87	1.38	190.48	284.57	32.41	2 308.30	0.30	14.61	1.19	1.04	0.90	5.47	1.36	7.89	7.36	18.19
样品编号	Cs	Pb	U	Bi	V	Cr	Tl
F7-017	4.17	12.43	1.19	0.09	165.20	17.30	0.63
F7-037	11.74	30.06	17.89	6.45	8.95	1.76	0.66
F7-039	1.44	17.10	1.12	1.06	15.63	4.16	0.62
F7-040	1.27	15.42	0.91	3.77	11.03	1.87	0.72