华北克拉通南缘小秦岭地区花岗质片麻岩年代学和地球化学特征及其地质意义

doi:10.19657/j.geoscience.1000-8527.2021.121

现代地质 ›› 2021, Vol. 35 ›› Issue (06): 1702-1712.DOI: 10.19657/j.geoscience.1000-8527.2021.121

• 秦岭金——多金属成矿作用 • 上一篇下一篇

华北克拉通南缘小秦岭地区花岗质片麻岩年代学和地球化学特征及其地质意义

谢亘¹^,²(), 喻光明², 路英川²^,³, 冯欣¹^,², 田光昊¹^,², 王然¹^,², 王建⁴

1.中国地质调查局廊坊自然资源综合调查中心,河北廊坊 065000
2.中国地质调查局自然资源综合调查指挥中心,北京 100055
3.中国地质调查局地球物理调查中心,河北廊坊 065000
4.卡迪夫大学地球与海洋科学学院,威尔士卡迪夫 CF10 3AT

收稿日期:2021-08-11 修回日期:2021-11-02 出版日期:2021-12-10 发布日期:2022-02-14
作者简介:谢亘, 男, 工程师, 1987年出生, 矿物学、岩石学、矿床学专业,主要从事固体矿产勘查研究。Email: xiegen@mail.cgs.gov.cn。
基金资助:
中国地质调查局项目“全国自然资源调查项目组织实施费”(DD20208022);有色金属矿产地质调查中心全国危机矿山项目(200699105-5)

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

XIE Gen¹^,²(), YU Guangming², LU Yingchuan²^,³, FENG Xin¹^,², TIAN Guanghao¹^,², WANG Ran¹^,², WANG Jian⁴

1. Langfang Center for Integrated Natural Resources Survey, China Geological Survey, Langfang, Hebei 065000, China
2. Command Center for Integrated Natural Resource Survey, China Geological Survey, Beijing 100055, China
3. Center for Geophysical Survey, China Geological Survey, Langfang, Hebei 065000, China
4. School of Earth and Ocean Sciences, Cardiff University, Cardiff, Wales CF10 3AT, UK

Received:2021-08-11 Revised:2021-11-02 Online:2021-12-10 Published:2022-02-14

摘要/Abstract

摘要：

小秦岭地区位于华北中部造山带南段,是研究华北克拉通南缘演化的关键地区,对其研究不仅有助于深入了解华北克拉通古元古代构造演化特征,同时对于华北克拉通东西陆块碰撞时间的厘定也具有重要意义。通过对小秦岭北侧大湖金钼矿床围岩(花岗质片麻岩)的SIMS锆石U-Pb定年分析,获得其岩浆锆石谐和年龄为(2 455±59) Ma、变质锆石谐和年龄为(1 821±31) Ma。花岗质片麻岩具有高SiO₂、富碱和低Al₂O₃、CaO、MgO、P₂O₅ 的特征,同时富集LILEs(Rb、Th、K)、亏损 HFSEs(Nb)和Sr、P、Ti等元素。结合A/CNK-A/NK图解和Ga、Rb等微量元素特征分析,认为其原岩为A型花岗岩,具有非造山A1型花岗岩特征;大湖金钼矿床A型花岗岩在古元古代早期起源于基性岩浆(提供热源)底侵作用下的中—新太古代结晶基底物质的部分熔融,为陆内裂谷环境,并在古元古代晚期受到华北克拉通东部和西部陆块碰撞造山后伸展作用的影响。

关键词: 花岗质片麻岩, SIMS锆石U-Pb测年, A型花岗岩, 构造环境, 小秦岭

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

中图分类号:

谢亘, 喻光明, 路英川, 冯欣, 田光昊, 王然, 王建. 华北克拉通南缘小秦岭地区花岗质片麻岩年代学和地球化学特征及其地质意义[J]. 现代地质, 2021, 35(06): 1702-1712.

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.

图/表 9

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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

华北克拉通南缘小秦岭地区花岗质片麻岩年代学和地球化学特征及其地质意义

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

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