华北克拉通中部菅等岩体的成因及构造意义: 锆石U-Pb年代学、岩石地球化学的约束

doi:10.19657/j.geoscience.1000-8527.2024.112

摘要/Abstract

摘要： 准确约束华北克拉通基底形成和变质变形年龄,是理解华北克拉通早期构造演化的关键。菅等岩体位于华北克拉通中部造山带的东南段赞皇杂岩中,为~2.5 Ga花岗岩,并经历多期变质和变形。本文对菅等岩体及侵入岩体内部的未变形伟晶岩、粗粒变形花岗岩脉、细粒变形花岗岩脉、花岗质岩株进行了系统的野外调查、岩相学、岩石地球化学、锆石U-Pb年代学研究。结果表明:菅等岩体主体岩性为正长花岗岩,未变形伟晶岩岩性为二长花岗伟晶岩,粗粒变形花岗岩脉、细粒变形花岗岩脉、花岗质岩株均为正长花岗岩;菅等岩体及其内部的侵入体具有高Si,富K,富碱,低Ti、Fe、Mg,贫Ca,富集大离子亲石元素Rb,亏损高场强元素Ti的特征,且Rb/Sr=0.75~1.56,显示出壳源特征;岩石具有的高Al低Ti特征,以及岩浆锆石高Pb低Th,均指示菅等岩体为过铝质S型花岗岩类型;对锆石进行LA-ICP-MS测定显示存在~2.5 Ga、~2.3 Ga两期的花岗岩侵入事件,岩体内部侵入活动分为三期,分别形成于~2.5 Ga、~2.3 Ga、~2.1 Ga,其中细粒变形花岗岩脉中保留了1897±17 Ma的变质事件的记录。华北克拉通的构造演化由多期次岩浆侵入与变质事件共同驱动。~2.5 Ga的菅等岩体形成标志克拉通形成统一基底,指示早期构造稳定化过程。古元古代两期花岗岩侵入(2.3 Ga和2.1 Ga)揭示克拉通内部发生裂解-伸展事件,~1.85 Ga的变质事件代表东部与西部陆块之间的俯冲碰撞过程。

关键词: 菅等岩体, S型花岗岩, 岩石地球化学, 华北克拉通

Abstract:

Accurately constraining the basement formation and metamorphic deformation age of the North China Craton is the key to understanding the early tectonic evolution of the North China Craton. The Jiandeng intrusion is located in the Zanhuang complex in the southeast member of the central orogenic belt of the North China Craton, which is ~2.5 Ga granite and has undergone multi-stage metamorphism and deformation. A detailed multidisciplinary study on Jiandeng intrusion and associated undeformed pegmatites, coarse-grained deformed granite, fine-grained deformed granite,and granitic stock within Jiandeng intrusion includes field investigation, petrography, petrogeochemistry, and zircon U-Pb chronology. The results show that the main lithologies are gneiss syenogranite and monzogranite pegmatite for undeformed pegmatites. The lithologies of the other three intrusions are syenogranite. The geochemical characteristics of jiandeng intrusion and veins show high Si, rich in K and alkali elements contents, low Ti, Fe, Mg and Ca content, and rich in large ion lithophilic element Rb but deficient in high field strength element Ti. The Rb/Sr ratio ranges from 0.75 to 1.56, indicating crustal source characteristics. High Al and low Ti, and high Pb and low Th in magmatic zircon, further indicate that the Jiandeng intrusion belong to peraluminous S-type granite. LA-ICP-MS dating of zircon shows that there are ~2.5 Ga and ~2.3 Ga granite magmatic events. Veins magmatic activity can be divided into three stages, with the first three stages formed at ~2.5 Ga, ~2.3 Ga, and ~2.1 Ga, respectively. The fine-grained deformed granite records a metamorphic event at 1897±17 Ma. The tectonic evolution of the North China Craton is driven by a combination of multi-stage magmatic intrusions and metamorphic events. The formation of the Jiandeng intrusion at ~2.5 Ga marks the formation of a unified basement, indicating an early tectonic stabilization process. The Paleoproterozoic granite intrusions (2.3 Ga and 2.1 Ga) revealed a cracking-extensional event within the craton, and the metamorphic event of ~1.85 Ga represented a subduction collision process between the eastern and western land masses.

Key words: Jiandeng intrusion, S-type granite, petrogeochemistry, North China craton

中图分类号:

P581

吴晓贺, 张聚全, 段站站, 张乐民, 温雨菁, 郭子桤, 李清. 华北克拉通中部菅等岩体的成因及构造意义: 锆石U-Pb年代学、岩石地球化学的约束[J]. 现代地质, 2025, 39(03): 728-751.

WU Xiaohe, ZHANG Juquan, DUAN Zhanzhan, ZHANG Lemin, WEN Yujing, GUO Ziqi, LI Qing. The Genesis and Tectonic Significance of Jiandeng Intrusive Rock in the Central North China Craton: Constraints from Zircon U-Pb Chronology and Petrogeochemistry[J]. Geoscience, 2025, 39(03): 728-751.

图/表 22

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	ZH18-1	ZH18-2	ZH18-3	ZH18-4	ZH19-1-1b	ZH19-1-2b	ZH19-2b	ZH19-3b
SiO₂	72.64	71.07	73.98	76.04	74.25	71.29	74.14	75.31
TiO₂	0.20	0.22	0.02	0.02	0.14	0.15	0.16	0.04
Al₂O₃	14.27	15.17	14.77	13.43	13.72	15.36	13.77	14.10
MnO	0.01	0.02	0.00	0.00	0.01	0.01	0.01	0.00
MgO	0.51	0.63	0.16	0.18	0.36	0.30	0.33	0.14
CaO	0.98	1.17	0.74	0.48	0.84	0.92	0.79	1.20
Na₂O	3.49	4.09	4.32	3.44	3.04	3.22	3.02	4.36
K₂O	5.57	4.78	5.02	5.44	5.48	6.51	5.51	3.77
P₂O₅	0.07	0.05	0.01	0.01	0.04	0.04	0.03	0.01
Fe₂O₃	0.51	0.66	0.36	0.25	0.94	1.06	1.20	0.40
FeO	0.61	1.07	0.17	0.16	0.27	0.18	0.11	0.12
灼失量	0.93	0.80	0.37	0.44	0.75	0.79	0.83	0.46
总和	99.86	99.86	99.95	99.89	99.88	99.85	99.90	99.93

	ZH18-1	ZH18-2	ZH18-3	ZH18-4	ZH19-1-1b	ZH19-1-2b	ZH19-2b	ZH19-3b
SiO₂	72.64	71.07	73.98	76.04	74.25	71.29	74.14	75.31
TiO₂	0.20	0.22	0.02	0.02	0.14	0.15	0.16	0.04
Al₂O₃	14.27	15.17	14.77	13.43	13.72	15.36	13.77	14.10
MnO	0.01	0.02	0.00	0.00	0.01	0.01	0.01	0.00
MgO	0.51	0.63	0.16	0.18	0.36	0.30	0.33	0.14
CaO	0.98	1.17	0.74	0.48	0.84	0.92	0.79	1.20
Na₂O	3.49	4.09	4.32	3.44	3.04	3.22	3.02	4.36
K₂O	5.57	4.78	5.02	5.44	5.48	6.51	5.51	3.77
P₂O₅	0.07	0.05	0.01	0.01	0.04	0.04	0.03	0.01
Fe₂O₃	0.51	0.66	0.36	0.25	0.94	1.06	1.20	0.40
FeO	0.61	1.07	0.17	0.16	0.27	0.18	0.11	0.12
灼失量	0.93	0.80	0.37	0.44	0.75	0.79	0.83	0.46
总和	99.86	99.86	99.95	99.89	99.88	99.85	99.90	99.93

成分	ZH18-1	ZH18-2	ZH18-3	ZH18-4	ZH19-1-1b	ZH19-1-2b	ZH19-2b	ZH19-3b
Li	12.18	12.67	5.14	3.65	11.25	11.66	10.19	5.81
Be	1.27	1.76	1.09	1.05	1.50	1.36	1.50	2.09
Sc	1.60	2.53	0.78	0.33	1.32	1.38	1.71	0.64
V	14.75	15.28	4.38	6.83	11.48	10.40	11.73	4.92
Cr	2.54	2.97	0.74	0.67	3.50	2.99	4.28	2.94
Co	1.53	2.41	0.36	0.38	1.31	1.58	1.95	0.90
Ni	2.44	10.58	2.58	1.51	2.98	2.40	5.29	2.32
Cu	3.71	4.26	3.80	11.69	4.91	4.87	7.21	3.57
Ga	15.40	15.63	14.89	13.89	14.23	15.06	15.71	16.25
Rb	128.26	106.96	136.50	107.57	134.36	150.29	177.72	133.65
Sr	142.77	143.44	87.35	122.95	140.19	167.18	115.08	138.62
Zr	189.66	171.95	44.98	81.40	165.05	124.89	115.00	72.38
Nb	3.17	6.50	2.31	0.95	4.44	3.22	4.67	2.45
Mo	0.38	0.14	0.07	0.09	0.11	0.62	0.12	0.21
Cd	0.01	0.01	0.02	0.02	0.01	0.01	0.02	0.01
In	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.00
Cs	3.39	1.93	3.09	1.84	5.54	3.13	4.24	2.36
Ba	637.19	574.39	112.60	466.29	488.58	704.87	442.66	244.08
Hf	5.86	5.50	1.70	4.11	5.46	4.08	4.01	2.69
Ta	0.31	0.59	0.25	0.17	0.90	0.37	0.23	0.44
W	0.25	0.12	0.10	0.12	0.18	0.23	0.31	0.27
Tl	0.51	0.45	0.62	0.44	0.54	0.62	0.77	0.64
Pb	12.55	12.68	22.51	10.27	12.43	16.61	14.93	20.16
Bi	0.08	0.06	0.04	0.11	0.20	0.09	0.04	0.18
Th	12.82	14.96	0.38	3.85	16.57	14.98	11.82	19.54
U	0.98	1.10	0.77	0.56	1.08	0.89	0.61	1.43
La	38.34	30.43	1.61	4.92	27.46	22.57	16.52	2.05
Ce	72.49	56.47	2.65	9.68	48.75	45.58	33.68	3.51
Pr	8.41	6.55	0.37	1.15	5.80	5.23	3.50	0.49
Nd	28.44	21.76	1.43	3.95	19.68	17.12	11.69	1.85
Sm	4.29	3.50	0.38	0.66	3.01	2.57	1.84	0.50
Eu	0.86	0.68	0.22	0.47	0.62	0.73	0.51	0.33
Gd	3.61	3.02	0.33	0.54	2.70	2.32	1.60	0.43
Tb	0.33	0.36	0.06	0.06	0.25	0.21	0.17	0.08
Dy	1.08	1.68	0.44	0.26	0.95	0.76	0.67	0.48
Ho	0.17	0.29	0.10	0.04	0.16	0.13	0.11	0.09
Er	0.58	0.90	0.32	0.12	0.55	0.41	0.36	0.25
Tm	0.07	0.14	0.07	0.03	0.09	0.06	0.06	0.05
Yb	0.47	0.91	0.45	0.15	0.58	0.38	0.38	0.29
Lu	0.07	0.13	0.07	0.03	0.09	0.06	0.06	0.04
Y	4.67	8.03	3.14	1.14	4.59	3.43	3.05	2.58
ΣREE	159.21	126.82	8.51	22.06	110.68	98.13	71.15	10.43
LREE	152.83	119.39	6.66	20.83	105.32	93.80	67.75	8.73
HREE	6.38	7.44	1.85	1.23	5.35	4.33	3.40	1.70
LREE/HREE	23.97	16.05	3.60	16.94	19.67	21.68	19.90	5.14
(La/Yb)_N	59.02	23.89	2.58	24.19	34.23	42.66	31.35	5.12
δEu	0.65	0.62	1.90	2.34	0.65	0.89	0.89	2.12
δCe	0.95	0.94	0.81	0.96	0.90	0.99	1.03	0.83
M	2.59	2.32	1.41	1.44	1.29	1.36	1.28	1.36
T(℃)	717.75	727.93	685.51	727.71	796.66	767.56	766.47	724.18

成分	ZH18-1	ZH18-2	ZH18-3	ZH18-4	ZH19-1-1b	ZH19-1-2b	ZH19-2b	ZH19-3b
Li	12.18	12.67	5.14	3.65	11.25	11.66	10.19	5.81
Be	1.27	1.76	1.09	1.05	1.50	1.36	1.50	2.09
Sc	1.60	2.53	0.78	0.33	1.32	1.38	1.71	0.64
V	14.75	15.28	4.38	6.83	11.48	10.40	11.73	4.92
Cr	2.54	2.97	0.74	0.67	3.50	2.99	4.28	2.94
Co	1.53	2.41	0.36	0.38	1.31	1.58	1.95	0.90
Ni	2.44	10.58	2.58	1.51	2.98	2.40	5.29	2.32
Cu	3.71	4.26	3.80	11.69	4.91	4.87	7.21	3.57
Ga	15.40	15.63	14.89	13.89	14.23	15.06	15.71	16.25
Rb	128.26	106.96	136.50	107.57	134.36	150.29	177.72	133.65
Sr	142.77	143.44	87.35	122.95	140.19	167.18	115.08	138.62
Zr	189.66	171.95	44.98	81.40	165.05	124.89	115.00	72.38
Nb	3.17	6.50	2.31	0.95	4.44	3.22	4.67	2.45
Mo	0.38	0.14	0.07	0.09	0.11	0.62	0.12	0.21
Cd	0.01	0.01	0.02	0.02	0.01	0.01	0.02	0.01
In	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.00
Cs	3.39	1.93	3.09	1.84	5.54	3.13	4.24	2.36
Ba	637.19	574.39	112.60	466.29	488.58	704.87	442.66	244.08
Hf	5.86	5.50	1.70	4.11	5.46	4.08	4.01	2.69
Ta	0.31	0.59	0.25	0.17	0.90	0.37	0.23	0.44
W	0.25	0.12	0.10	0.12	0.18	0.23	0.31	0.27
Tl	0.51	0.45	0.62	0.44	0.54	0.62	0.77	0.64
Pb	12.55	12.68	22.51	10.27	12.43	16.61	14.93	20.16
Bi	0.08	0.06	0.04	0.11	0.20	0.09	0.04	0.18
Th	12.82	14.96	0.38	3.85	16.57	14.98	11.82	19.54
U	0.98	1.10	0.77	0.56	1.08	0.89	0.61	1.43
La	38.34	30.43	1.61	4.92	27.46	22.57	16.52	2.05
Ce	72.49	56.47	2.65	9.68	48.75	45.58	33.68	3.51
Pr	8.41	6.55	0.37	1.15	5.80	5.23	3.50	0.49
Nd	28.44	21.76	1.43	3.95	19.68	17.12	11.69	1.85
Sm	4.29	3.50	0.38	0.66	3.01	2.57	1.84	0.50
Eu	0.86	0.68	0.22	0.47	0.62	0.73	0.51	0.33
Gd	3.61	3.02	0.33	0.54	2.70	2.32	1.60	0.43
Tb	0.33	0.36	0.06	0.06	0.25	0.21	0.17	0.08
Dy	1.08	1.68	0.44	0.26	0.95	0.76	0.67	0.48
Ho	0.17	0.29	0.10	0.04	0.16	0.13	0.11	0.09
Er	0.58	0.90	0.32	0.12	0.55	0.41	0.36	0.25
Tm	0.07	0.14	0.07	0.03	0.09	0.06	0.06	0.05
Yb	0.47	0.91	0.45	0.15	0.58	0.38	0.38	0.29
Lu	0.07	0.13	0.07	0.03	0.09	0.06	0.06	0.04
Y	4.67	8.03	3.14	1.14	4.59	3.43	3.05	2.58
ΣREE	159.21	126.82	8.51	22.06	110.68	98.13	71.15	10.43
LREE	152.83	119.39	6.66	20.83	105.32	93.80	67.75	8.73
HREE	6.38	7.44	1.85	1.23	5.35	4.33	3.40	1.70
LREE/HREE	23.97	16.05	3.60	16.94	19.67	21.68	19.90	5.14
(La/Yb)_N	59.02	23.89	2.58	24.19	34.23	42.66	31.35	5.12
δEu	0.65	0.62	1.90	2.34	0.65	0.89	0.89	2.12
δCe	0.95	0.94	0.81	0.96	0.90	0.99	1.03	0.83
M	2.59	2.32	1.41	1.44	1.29	1.36	1.28	1.36
T(℃)	717.75	727.93	685.51	727.71	796.66	767.56	766.47	724.18

样品号		含量(10^-6)		Th/U	同位素比值						rho	同位素年龄(Ma)
样品号		Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	rho	²⁰⁷Pb/ ²⁰⁶Pb		1σ		²⁰⁷Pb/ ²³⁵U		1σ		²⁰⁶Pb/ ²³⁸U		1σ
ZH18-1	Min	28	62	0.15	0.1280	0.0025	2.3781	0.0436	0.1345	0.0020	0.6950	2072		12		1236		12		813		11
	Max	1729	1884	1.15	0.1663	0.0013	11.1929	0.3867	0.4947	0.0152	0.9586	2522		32		2539		44		2591		72
	Avg	213	425	0.56	0.1562	0.0018	8.2923	0.1807	0.3767	0.0070	0.8413	2410		20		2197		19		2037		32
ZH19- 1-1b	Min	75	140	0.21	0.1401	0.0017	5.4676	0.1036	0.2819	0.0032	0.5330	2229		16		1896		15		1601		15
	Max	871	633	5.37	0.1643	0.0023	10.6698	0.2516	0.4723	0.0108	0.9725	2502		27		2495		38		2494		53
	Avg	237	245	1.20	0.1534	0.0020	8.2413	0.1748	0.3862	0.0068	0.8044	2383		22		2242		20		2099		32
ZH19- 1-2b	Min	59	112	0.20	0.1272	0.0018	3.4471	0.0867	0.1953	0.0034	0.6727	2059		16		1515		15		1150		18
	Max	833	452	2.32	0.1643	0.0023	11.0064	0.2889	0.4856	0.0132	0.9952	2502		28		2524		29		2552		58
	Avg	218	267	0.76	0.1525	0.0021	8.0571	0.1841	0.3779	0.0073	0.8262	2375		23		2207		21		2056		34
ZH18-3	Min	252	73	0.15	0.1261	0.0014	2.3652	0.0292	0.1358	0.0013	0.7068	2044		14		1232		9		821		7
	Max	1538	2296	1.15	0.1652	0.0026	11.1065	0.4401	0.5008	0.0173	0.9573	2510		27		2532		45		2617		80
	Avg	378	835	0.52	0.1503	0.0018	5.8881	0.1528	0.2769	0.0061	0.8408	2343		20		1894		21		1556		30
ZH18-4	Min	20	150	0.03	0.1188	0.0013	1.5191	0.0361	0.0922	0.0015	0.6525	1939		11		938		10		569		9
	Max	2161	2455	1.07	0.1657	0.0025	10.2253	0.3616	0.5330	0.0190	0.9814	2515		31		2455		56		2754		80
	Avg	385	1357	0.25	0.1467	0.0017	5.7666	0.1423	0.2794	0.0061	0.8596	2302		20		1856		22		1561		30
ZH19-3b	Min	64	117	0.13	0.1172	0.0017	1.8639	0.0470	0.1145	0.0022	0.6134		1914		22		1068		14		699		13
	Max	1029	1618	1.68	0.1598	0.0030	10.7330	0.2912	0.5214	0.0105	0.9197		2453		37		2500		48		2705		51
	Avg	277	610	0.53	0.1423	0.0021	6.5445	0.1730	0.3240	0.0067	0.7679		2248		26		1981		24		1785		32
ZH18-2	Min	2	54	0.03	0.1106	0.0015	2.6552	0.0795	0.1735	0.0037	0.6925		1810		12		1316		12		1032		19
	Max	969	1346	2.96	0.1670	0.0024	11.7878	0.3210	0.5220	0.0131	0.9595		2528		36		2588		46		2708		66
	Avg	277	294	1.01	0.1506	0.0019	8.3723	0.1753	0.3944	0.0069	0.8225		2335		21		2227		19		2131		32