The Genesis and Tectonic Significance of Jiandeng Intrusive Rock in the Central North China Craton: Constraints from Zircon U-Pb Chronology and Petrogeochemistry

doi:10.19657/j.geoscience.1000-8527.2024.112

Abstract

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

CLC Number:

P581

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.

Figures/Tables 22

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样品号	野外产出形态	岩性	矿物组合(%)
样品号	野外产出形态	岩性	Q	P	A
ZH18-1	正长花岗岩 (菅等岩体)	正长花岗岩	29	11	60
ZH19-1-1b			27	12	61
ZH19-1-2b			31	11	58
ZH19-2b			27	12	61
ZH18-2	细粒变形花岗岩脉	正长花岗岩	29	15	56
ZH18-3	未变形伟晶岩	二长花岗伟晶岩	31	37	32
ZH18-4	粗粒变形花岗岩脉	正长花岗岩	30	10	60
ZH19-3b	花岗质岩株	正长花岗岩	30	10	60

样品号	野外产出形态	岩性	矿物组合(%)
样品号	野外产出形态	岩性	Q	P	A
ZH18-1	正长花岗岩 (菅等岩体)	正长花岗岩	29	11	60
ZH19-1-1b			27	12	61
ZH19-1-2b			31	11	58
ZH19-2b			27	12	61
ZH18-2	细粒变形花岗岩脉	正长花岗岩	29	15	56
ZH18-3	未变形伟晶岩	二长花岗伟晶岩	31	37	32
ZH18-4	粗粒变形花岗岩脉	正长花岗岩	30	10	60
ZH19-3b	花岗质岩株	正长花岗岩	30	10	60

	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