The formation age and origin of syenite granite in Shengsi, Zhejiang Province: Constraints from zircon U-Pb ages, rock geochemistry and Hf isotopes

doi:10.13745/j.esf.sf.2024.11.5

Abstract

Abstract:

Shengsi Island, located at the northernmost end of the Zhejiang-Fujian magmatic belt, represents a transitional zone between land and sea, significantly influenced by the subduction of the ancient Pacific Plate. Petrological analysis, zircon U-Pb geochronology, zircon Lu-Hf isotopic microanalysis, and geochemical characterization were conducted on the Shengsi syenite granite pluton in this study.The Shengsi pluton primarily consists of potassium feldspar (50%-65%), quartz (20%-25%), plagioclase (20%-25%), and biotite (5%-10%), exhibiting a medium- to fine-grained granite texture. High-precision zircon U-Pb dating yielded a weighted average age of 95.4±1.2 Ma, indicating that the pluton formed during the Late Cretaceous. Zircon Lu-Hf isotopic analysis revealed the consistently negative ε_Hf(t) values (-6.2 to -4.0) with a narrow range of variation, significantly higher than the average crustal value. The two-stage zircon model ages range from 1405 Ma to 1547 Ma (mean 1465 Ma), which are younger than the second-stage model ages of the Huaxia basement metamorphic rocks (Taoxi). Geochemical analysis indicates that the Shengsi syenite granite is characterized by high silicon, alkali, aluminum, and potassium contents, with extremely low levels of Mg, Ca, P, Ti, and Fe. It belongs to the metaluminous to weakly peraluminous, high-potassium calc-alkaline granite series. The rock is enriched in large-ion lithophile elements (e.g., Rb, K) and high-field-strength elements (e.g., Th, U, Zr, Hf), while elements such as Nb, Sr, and P are depleted. The total rare earth element (REE) content is relatively high, with stronger fractionation of light REEs compared to heavy REEs, pronounced negative europium anomalies, and high fractionation indices. The low Sr and high Yb content of the granite suggests relatively low pressure during its formation. The Shengsi syenite granite is classified as A-type granite based on the petrological and geochemical characteristics, as well as the tectonic setting. It formed during the Late Cretaceous in a tectonic environment associated with the retreat and extension of the ancient Pacific Plate. This process involved lithospheric thinning and crustal melting caused by the intrusion and upwelling of mantle material. The resulting magma, primarily crustal in origin, formed through shallow crustal intrusion after crust-mantle mixing.

Key words: syenite granite, petrogenesis, tectonic setting, Shengsi, Late Cretaceous

CLC Number:

PAN Shaojun, ZHANG Jianfang, CHEN Xiaoyou, MA Junxiang, CAI Xiaoliang, HUANG Guocheng. The formation age and origin of syenite granite in Shengsi, Zhejiang Province: Constraints from zircon U-Pb ages, rock geochemistry and Hf isotopes[J]. Earth Science Frontiers, 2025, 32(2): 430-444.

Figures/Tables 14

References 67

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样品号	w_B/%													AKI	A/NK	A/CNK
样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	ALK	AKI	A/NK	A/CNK
SS01	74.38	0.22	13.5	1.02	0.31	0.06	0.22	0.58	4.34	4.95	0.03	0.1	9.29	0.93	1.08	1.00
SS05	73.02	0.34	13.71	1.29	0.7	0.08	0.48	1.08	4.17	4.59	0.07	0.1	8.76	0.86	1.16	1.01
SS18	73.84	0.29	13.17	1.01	0.59	0.08	0.4	0.81	4.2	4.6	0.06	0.53	8.80	0.90	1.11	1.00
SS19	73.94	0.32	13.59	1.33	0.41	0.07	0.4	0.56	4.16	4.73	0.07	0.17	8.89	0.88	1.14	1.06
SS20	72.77	0.34	13.45	1.3	0.52	0.14	0.44	0.74	4.06	4.97	0.07	0.74	9.03	0.90	1.12	1.02
样品号	端员组分占比/%									长石占比/%		AR	SI	σ	τ	DI
样品号	Qtz	An	Ab	Fk	C	Hy	Il	Mt	Ap	A	Pl	AR	SI	σ	τ	DI
SS01	28.64	2.67	36.88	29.38	0.03	0.98	0.42	0.92	0.08	60.59	8.34	4.21	2.04	2.75	41.64	94.90
SS05	28.19	4.90	35.46	27.26	0.10	1.93	0.65	1.35	0.17	53.34	14.28	3.59	4.29	2.55	28.06	90.91
SS18	29.69	3.53	35.89	27.45	0.12	1.53	0.56	1.10	0.13	56.00	10.88	4.01	3.71	2.50	30.93	93.04
SS19	29.93	2.33	35.37	28.08	0.78	1.56	0.61	1.18	0.16	58.41	7.37	3.85	3.64	2.55	29.47	93.38
SS20	28.13	3.25	34.79	29.74	0.22	1.81	0.65	1.25	0.16	58.28	9.50	3.68	3.91	2.72	27.62	92.65

样品号	w_B/%													AKI	A/NK	A/CNK
样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	ALK	AKI	A/NK	A/CNK
SS01	74.38	0.22	13.5	1.02	0.31	0.06	0.22	0.58	4.34	4.95	0.03	0.1	9.29	0.93	1.08	1.00
SS05	73.02	0.34	13.71	1.29	0.7	0.08	0.48	1.08	4.17	4.59	0.07	0.1	8.76	0.86	1.16	1.01
SS18	73.84	0.29	13.17	1.01	0.59	0.08	0.4	0.81	4.2	4.6	0.06	0.53	8.80	0.90	1.11	1.00
SS19	73.94	0.32	13.59	1.33	0.41	0.07	0.4	0.56	4.16	4.73	0.07	0.17	8.89	0.88	1.14	1.06
SS20	72.77	0.34	13.45	1.3	0.52	0.14	0.44	0.74	4.06	4.97	0.07	0.74	9.03	0.90	1.12	1.02
样品号	端员组分占比/%									长石占比/%		AR	SI	σ	τ	DI
样品号	Qtz	An	Ab	Fk	C	Hy	Il	Mt	Ap	A	Pl	AR	SI	σ	τ	DI
SS01	28.64	2.67	36.88	29.38	0.03	0.98	0.42	0.92	0.08	60.59	8.34	4.21	2.04	2.75	41.64	94.90
SS05	28.19	4.90	35.46	27.26	0.10	1.93	0.65	1.35	0.17	53.34	14.28	3.59	4.29	2.55	28.06	90.91
SS18	29.69	3.53	35.89	27.45	0.12	1.53	0.56	1.10	0.13	56.00	10.88	4.01	3.71	2.50	30.93	93.04
SS19	29.93	2.33	35.37	28.08	0.78	1.56	0.61	1.18	0.16	58.41	7.37	3.85	3.64	2.55	29.47	93.38
SS20	28.13	3.25	34.79	29.74	0.22	1.81	0.65	1.25	0.16	58.28	9.50	3.68	3.91	2.72	27.62	92.65

样品号	w_B/10^-6																	K/Rb		Rb/Sr		Rb/Ba		Th/Ta
样品号	Ba	Cd	Co	Cr	Cs	Hf	Li	Nb	Ni	Rb	Sc	Sr	Ta	Th	U	V	Zr	K/Rb		Rb/Sr		Rb/Ba		Th/Ta
SS01	332	0.045	1.05	1.03	1.97	9.71	5.69	24.10	0.42	182	3.41	61.80	1.50	23.20	2.84	18.40	193	225.68		2.94		0.55		15.47
SS05	409	0.042	2.02	1.23	1.90	14.50	14.80	24.40	0.76	200	5.45	121	1.55	29.60	5.76	19.00	231	190.44		1.65		0.49		19.10
SS18	368	0.037	1.05	1.47	2.71	11.50	8.22	24.90	0.63	215	5.07	84.50	1.34	28.80	4.28	21.40	218	177.54		2.54		0.58		21.49
SS19	408	0.220	1.09	1.38	2.77	13.00	10.60	25.60	0.79	196	5.28	95.90	1.52	27.50	4.65	21.10	227	200.25		2.04		0.48		18.09
SS20	500	0.190	1.19	1.31	2.84	12.70	6.21	25.90	0.65	208	5.28	114	1.60	31.70	4.65	16.80	245	198.27		1.82		0.42		19.81
平均值	403	0.107	1.28	1.28	2.44	12.28	9.10	24.98	0.65	200	4.90	95.44	1.50	28.16	4.44	19.34	223	198.44		2.20		0.50		18.79
样品号	w_B/10^-6																LREE/ HREE		(La/Yb)_N		δEu		δCe	T_Zr/℃
样品号	Ce	Dy	Er	Eu	Gd	Ho	La	Lu	Nd	Pr	Sm	Tb	Tm	Y	Yb	ΣREE	LREE/ HREE		(La/Yb)_N		δEu		δCe	T_Zr/℃
SS01	87.3	4.44	2.59	0.67	4.50	0.97	44.30	0.44	30.50	9.00	5.68	0.83	0.45	24.10	2.77	194	10.44		11.47		0.41		1.07	800
SS05	82.3	3.13	1.75	0.78	3.52	0.69	47.50	0.35	26.60	7.87	4.53	0.60	0.33	15.90	2.10	182	13.60		16.22		0.60		1.04	814
SS18	75.7	3.56	2.05	0.76	3.81	0.77	41.90	0.42	25.70	7.53	4.64	0.67	0.37	19.30	2.47	170	11.06		12.17		0.55		1.04	810
SS19	107.0	4.06	2.33	0.89	4.46	0.88	62.00	0.45	32.90	9.87	5.68	0.78	0.42	21.10	2.69	234	13.59		16.53		0.54		1.06	820
SS20	122.0	4.93	2.90	1.02	5.37	1.08	70.40	0.50	39.70	12.00	6.73	0.95	0.49	26.60	3.07	271	13.06		16.45		0.52		1.03	821
平均值	94.9	4.02	2.32	0.82	4.33	0.88	53.22	0.43	31.08	9.25	5.45	0.77	0.41	21.40	2.62	210	12.35		14.57		0.52		1.05	813

样品号	w_B/10^-6																	K/Rb		Rb/Sr		Rb/Ba		Th/Ta
样品号	Ba	Cd	Co	Cr	Cs	Hf	Li	Nb	Ni	Rb	Sc	Sr	Ta	Th	U	V	Zr	K/Rb		Rb/Sr		Rb/Ba		Th/Ta
SS01	332	0.045	1.05	1.03	1.97	9.71	5.69	24.10	0.42	182	3.41	61.80	1.50	23.20	2.84	18.40	193	225.68		2.94		0.55		15.47
SS05	409	0.042	2.02	1.23	1.90	14.50	14.80	24.40	0.76	200	5.45	121	1.55	29.60	5.76	19.00	231	190.44		1.65		0.49		19.10
SS18	368	0.037	1.05	1.47	2.71	11.50	8.22	24.90	0.63	215	5.07	84.50	1.34	28.80	4.28	21.40	218	177.54		2.54		0.58		21.49
SS19	408	0.220	1.09	1.38	2.77	13.00	10.60	25.60	0.79	196	5.28	95.90	1.52	27.50	4.65	21.10	227	200.25		2.04		0.48		18.09
SS20	500	0.190	1.19	1.31	2.84	12.70	6.21	25.90	0.65	208	5.28	114	1.60	31.70	4.65	16.80	245	198.27		1.82		0.42		19.81
平均值	403	0.107	1.28	1.28	2.44	12.28	9.10	24.98	0.65	200	4.90	95.44	1.50	28.16	4.44	19.34	223	198.44		2.20		0.50		18.79
样品号	w_B/10^-6																LREE/ HREE		(La/Yb)_N		δEu		δCe	T_Zr/℃
样品号	Ce	Dy	Er	Eu	Gd	Ho	La	Lu	Nd	Pr	Sm	Tb	Tm	Y	Yb	ΣREE	LREE/ HREE		(La/Yb)_N		δEu		δCe	T_Zr/℃
SS01	87.3	4.44	2.59	0.67	4.50	0.97	44.30	0.44	30.50	9.00	5.68	0.83	0.45	24.10	2.77	194	10.44		11.47		0.41		1.07	800
SS05	82.3	3.13	1.75	0.78	3.52	0.69	47.50	0.35	26.60	7.87	4.53	0.60	0.33	15.90	2.10	182	13.60		16.22		0.60		1.04	814
SS18	75.7	3.56	2.05	0.76	3.81	0.77	41.90	0.42	25.70	7.53	4.64	0.67	0.37	19.30	2.47	170	11.06		12.17		0.55		1.04	810
SS19	107.0	4.06	2.33	0.89	4.46	0.88	62.00	0.45	32.90	9.87	5.68	0.78	0.42	21.10	2.69	234	13.59		16.53		0.54		1.06	820
SS20	122.0	4.93	2.90	1.02	5.37	1.08	70.40	0.50	39.70	12.00	6.73	0.95	0.49	26.60	3.07	271	13.06		16.45		0.52		1.03	821
平均值	94.9	4.02	2.32	0.82	4.33	0.88	53.22	0.43	31.08	9.25	5.45	0.77	0.41	21.40	2.62	210	12.35		14.57		0.52		1.05	813

测点号	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	ε_Hf(0)	ε_Hf(t)	T_DM/Ma	T_DM2/Ma	f_Lu/Hf
SS01-2	95.16	0.062 250	0.002 011	0.282 580	-6.79	-4.8	977	1 461	-0.94
SS01-4	95.19	0.045 845	0.001 490	0.282 566	-7.28	-5.3	983	1 489	-0.96
SS01-5	94.99	0.048 140	0.001 569	0.282 565	-7.33	-5.3	987	1 493	-0.95
SS01-6	95.05	0.042 788	0.001 411	0.282 599	-6.13	-4.1	935	1 417	-0.96
SS01-12	95.57	0.035 805	0.001 189	0.282 563	-7.37	-5.4	979	1 494	-0.96
SS01-14	95.33	0.054 392	0.001 872	0.282 551	-7.80	-5.8	1 015	1 524	-0.94
SS01-15	95.54	0.044 751	0.001 446	0.282 591	-6.40	-4.4	947	1 433	-0.96
SS01-16	95.15	0.044 407	0.001 442	0.282 604	-5.95	-4.0	928	1 405	-0.96
SS01-17	94.99	0.045 626	0.001 520	0.282 577	-6.89	-4.9	968	1 465	-0.95
SS01-19	95.45	0.044 209	0.001 412	0.282 596	-6.22	-4.2	939	1 422	-0.96
SS01-20	95.13	0.059 454	0.002 063	0.282 586	-6.58	-4.6	970	1 448	-0.94
SS01-21	95.20	0.046 759	0.001 550	0.282 579	-6.81	-4.8	966	1 460	-0.95
SS01-22	95.16	0.042 622	0.001 376	0.282 585	-6.60	-4.6	953	1 446	-0.96
SS01-26	95.28	0.053 984	0.001 836	0.282 574	-7.01	-5.0	981	1 473	-0.94
SS01-27	95.17	0.046 813	0.001 525	0.282 540	-8.20	-6.2	1 021	1 547	-0.95