Petrogenesis and Tectonic Significance of the Wuzhangshan Pluton in Xiong’ershan, Western Henan Province: Constraint from Petrogeochemistry and Sr-Nd-Pb Isotopes

doi:10.19657/j.geoscience.1000-8527.2020.043

Abstract

Abstract:

To analyze the magma origin and mechanism of the Yanshanian magmatism in eastern China, the authors conducted a study on the petrography, Sr-Nd-Hf isotope systematics, whole-rock major and trace element geochemistry of the Wuzhangshan pluton in Xiong’ershan. The Wuzhangshan pluton consists of biotite hornblende monzogranite, which is characterized by high SiO₂(66.44%-71.71%) and alkali contents (Na₂O+K₂O=9.8%-10.06%). The rocks contain relative high Al₂O₃(14.52%-15.63%), and low TFeO (1.71%-3.47%), CaO (0.51%-2.56%) and MgO (0.19%-0.59%), indicating their shoshonitic and metaluminous nature. The samples are enriched in LREEs, K, Sr, Pb, Zr, and Hf, but depleted in high field strength elements (HFSEs) such as HREEs, Ta, Nb, P,and Ti. These rocks have no obvious Eu anomaly (δEu=1.00-1.13) and with I-type granite characteristics. They have (⁸⁷Sr/⁸⁶Sr)_i=0.707,3 to 0.708,0, ε_Nd(t)=-20.5 to -17.9, and $T D M 2$ =2,599 to 2,389 Ma. Lead isotope compositions are similar (²⁰⁶Pb/²⁰⁴Pb=17.305-17.754; ²⁰⁷Pb/²⁰⁴Pb = 15.427-15.481; ²⁰⁸Pb/²⁰⁴Pb = 37.766-37.999), indicating that rocks were sourced from ancient crust material. These rocks have high values of Sr/Y (40.85-236.72) and La/Yb (19.34-30.46), indicating adakite-like features. The low MgO, Cr, and Ni contents and low Mg^# values indicate that the monzogranite was formed by partial melting of the thickened lower crust, probably related to the north-dipping intracontinental subduction of the Yangtze plate.

Key words: Wuzhangshan pluton, Sr-Nd-Pb isotope, geochemistry, petrogenesis, Xiong’ershan

CLC Number:

P588.1
P597

RAO Shicheng, WANG Changming, HE Xinyu, SHI Kangxing, ZHU Jiaxuan, CHEN Qi, DUAN Hongyu, LI Pengwei. Petrogenesis and Tectonic Significance of the Wuzhangshan Pluton in Xiong’ershan, Western Henan Province: Constraint from Petrogeochemistry and Sr-Nd-Pb Isotopes[J]. Geoscience, 2020, 34(06): 1230-1244.

Figures/Tables 15

Fig.1 Location of the Qinling Orogen (a), tectonic map of the Qinling Orogen (b), regional geologic map (c) , and geologic map of the Wuzhangshan pluton (d) (modified after Wang et al.[17])

Fig.2 Field outcrop(a),hand specimens (b) and microscopic ((c), (d)) photos of the Wuzhangshan pluton

Table 1 Major (%) ,trace element and REEs (10-6) contents of granite samples from the Wuzhangshan pluton

样品号	岩性	SiO₂	TiO₂	Al₂O₃	TFeO	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅
HSP13D721B1	花岗岩	66.44	0.29	15.17	3.47	2.50	1.22	0.05	0.56	2.56	4.63	5.17	0.11
HSP13D722B1	花岗岩	70.03	0.25	15.22	1.70	1.49	0.36	0.04	0.19	1.50	4.73	4.98	0.11
HSP13D723B1	花岗岩	71.71	0.15	14.83	2.05	1.34	0.84	0.03	0.26	0.51	4.70	5.33	0.06
HSP13D724B1	花岗岩	70.01	0.20	14.52	1.96	1.70	0.43	0.05	0.32	1.77	4.34	5.31	0.08
HSP13D725B1	花岗岩	69.57	0.21	15.22	2.27	1.52	0.90	0.04	0.28	1.69	4.89	4.81	0.09
HSP13D726B1	花岗岩	68.04	0.22	15.63	2.48	1.60	1.04	0.05	0.59	2.00	4.80	5.26	0.10
样品号	岩性	LOI	Total	Mg^#	A/CNK	A/NK	Li	Be	Sc	V	Cr	Co	Ni
HSP13D721B1	花岗岩	1.92	100.76	22.34	0.85	1.15	5.90	4.30	4.90	42.40	2.60	2.50	1.80
HSP13D722B1	花岗岩	1.42	100.36	16.60	0.96	1.15	6.30	2.50	3.20	34.70	3.00	1.20	1.20
HSP13D723B1	花岗岩	1.01	100.86	18.47	1.03	1.10	3.40	3.10	2.10	23.50	2.10	1.10	1.30
HSP13D724B1	花岗岩	1.70	100.48	22.54	0.90	1.13	4.10	4.70	3.20	32.10	2.90	1.60	1.30
HSP13D725B1	花岗岩	1.62	100.94	18.04	0.93	1.15	4.00	3.40	3.10	26.90	2.20	1.10	1.10
HSP13D726B1	花岗岩	1.17	100.62	29.78	0.91	1.15	5.20	3.40	3.60	24.60	2.40	1.90	1.40
样品号	岩性	Cu	Zn	Ga	Rb	Sr	Zr	Nb	Mo	Cd	In	Sb	Cs
HSP13D721B1	花岗岩	8.90	34.0	19.60	115.00	1 232	151	19.50	0.80	0.02	0.02	0.04	2.70
HSP13D722B1	花岗岩	6.20	21.0	18.00	111.00	947	199	21.30	0.60	0.03	0.02	0.23	1.80
HSP13D723B1	花岗岩	4.20	18.0	16.10	110.00	552	168	18.10	0.60	0.04	0.01	0.10	1.10
HSP13D724B1	花岗岩	5.70	27.0	18.20	123.00	625	141	23.50	1.40	0.02	0.03	0.08	1.10
HSP13D725B1	花岗岩	5.00	19.0	17.10	104.00	904	189	20.70	0.60	0.01	0.02	0.04	0.70
HSP13D726B1	花岗岩	6.30	24.0	16.90	116.00	4 190	164	21.10	0.50	0.02	0.02	0.03	0.80
样品号	岩性	Ba	Hf	Ta	W	Re	Tl	Pb	Bi	Th	U	Y	La
HSP13D721B1	花岗岩	3 768	4.80	0.90	1.80	0	0.50	32.10	-	35.20	7.10	21.70	46.80
HSP13D722B1	花岗岩	2 445	6.30	0.90	0.60	0	0.50	38.10	-	24.60	3.50	14.30	37.20
HSP13D723B1	花岗岩	1 457	5.90	0.80	1.40	0	0.40	18.70	-	18.50	2.90	11.40	27.00
HSP13D724B1	花岗岩	2 200	5.20	1.00	1.50	<0.002	0.50	28.10	0.10	21.80	4.20	15.30	42.00
HSP13D725B1	花岗岩	2 005	6.20	0.90	0.90	0	0.40	31.10	-	25.30	3.10	10.60	39.60
HSP13D726B1	花岗岩	2 580	5.20	0.90	0.80	0	0.50	30.60	-	19.30	6.00	17.70	42.50
样品号	岩性	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb
HSP13D721B1	花岗岩	79.10	8.56	29.90	4.94	1.72	4.11	0.68	3.63	0.72	2.23	0.35	2.42
HSP13D722B1	花岗岩	63.60	6.89	24.30	3.74	1.26	3.28	0.49	2.55	0.49	1.39	0.23	1.49
HSP13D723B1	花岗岩	43.00	4.37	14.90	2.45	0.76	2.10	0.32	1.87	0.38	1.24	0.21	1.52
HSP13D724B1	花岗岩	63.50	6.38	22.70	3.33	1.17	3.10	0.48	2.58	0.48	1.55	0.28	1.94
HSP13D725B1	花岗岩	58.50	5.99	19.80	3.07	1.00	2.50	0.37	1.89	0.34	1.06	0.19	1.30
HSP13D726B1	花岗岩	64.30	6.54	22.70	3.60	1.16	3.22	0.54	2.82	0.58	1.89	0.31	2.05
样品号	岩性	Lu	ΣREE	LREE	HREE	LREE/HREE	(La/Yb)_N	δEu	δCe
HSP13D721B1	花岗岩	0.35	185.51	171.02	14.49	11.80	13.04	1.14	0.90
HSP13D722B1	花岗岩	0.23	147.13	136.99	10.14	13.50	16.83	1.08	0.91
HSP13D723B1	花岗岩	0.25	100.37	92.48	7.89	11.72	11.98	1.00	0.88
HSP13D724B1	花岗岩	0.31	149.79	139.08	10.71	12.98	14.60	1.10	0.85
HSP13D725B1	花岗岩	0.21	135.82	127.96	7.86	16.28	20.54	1.07	0.83
HSP13D726B1	花岗岩	0.33	152.54	140.80	11.74	11.99	13.98	1.02	0.85

Table 1 Major (%) ,trace element and REEs (10-6) contents of granite samples from the Wuzhangshan pluton

样品号	岩性	SiO₂	TiO₂	Al₂O₃	TFeO	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅
HSP13D721B1	花岗岩	66.44	0.29	15.17	3.47	2.50	1.22	0.05	0.56	2.56	4.63	5.17	0.11
HSP13D722B1	花岗岩	70.03	0.25	15.22	1.70	1.49	0.36	0.04	0.19	1.50	4.73	4.98	0.11
HSP13D723B1	花岗岩	71.71	0.15	14.83	2.05	1.34	0.84	0.03	0.26	0.51	4.70	5.33	0.06
HSP13D724B1	花岗岩	70.01	0.20	14.52	1.96	1.70	0.43	0.05	0.32	1.77	4.34	5.31	0.08
HSP13D725B1	花岗岩	69.57	0.21	15.22	2.27	1.52	0.90	0.04	0.28	1.69	4.89	4.81	0.09
HSP13D726B1	花岗岩	68.04	0.22	15.63	2.48	1.60	1.04	0.05	0.59	2.00	4.80	5.26	0.10
样品号	岩性	LOI	Total	Mg^#	A/CNK	A/NK	Li	Be	Sc	V	Cr	Co	Ni
HSP13D721B1	花岗岩	1.92	100.76	22.34	0.85	1.15	5.90	4.30	4.90	42.40	2.60	2.50	1.80
HSP13D722B1	花岗岩	1.42	100.36	16.60	0.96	1.15	6.30	2.50	3.20	34.70	3.00	1.20	1.20
HSP13D723B1	花岗岩	1.01	100.86	18.47	1.03	1.10	3.40	3.10	2.10	23.50	2.10	1.10	1.30
HSP13D724B1	花岗岩	1.70	100.48	22.54	0.90	1.13	4.10	4.70	3.20	32.10	2.90	1.60	1.30
HSP13D725B1	花岗岩	1.62	100.94	18.04	0.93	1.15	4.00	3.40	3.10	26.90	2.20	1.10	1.10
HSP13D726B1	花岗岩	1.17	100.62	29.78	0.91	1.15	5.20	3.40	3.60	24.60	2.40	1.90	1.40
样品号	岩性	Cu	Zn	Ga	Rb	Sr	Zr	Nb	Mo	Cd	In	Sb	Cs
HSP13D721B1	花岗岩	8.90	34.0	19.60	115.00	1 232	151	19.50	0.80	0.02	0.02	0.04	2.70
HSP13D722B1	花岗岩	6.20	21.0	18.00	111.00	947	199	21.30	0.60	0.03	0.02	0.23	1.80
HSP13D723B1	花岗岩	4.20	18.0	16.10	110.00	552	168	18.10	0.60	0.04	0.01	0.10	1.10
HSP13D724B1	花岗岩	5.70	27.0	18.20	123.00	625	141	23.50	1.40	0.02	0.03	0.08	1.10
HSP13D725B1	花岗岩	5.00	19.0	17.10	104.00	904	189	20.70	0.60	0.01	0.02	0.04	0.70
HSP13D726B1	花岗岩	6.30	24.0	16.90	116.00	4 190	164	21.10	0.50	0.02	0.02	0.03	0.80
样品号	岩性	Ba	Hf	Ta	W	Re	Tl	Pb	Bi	Th	U	Y	La
HSP13D721B1	花岗岩	3 768	4.80	0.90	1.80	0	0.50	32.10	-	35.20	7.10	21.70	46.80
HSP13D722B1	花岗岩	2 445	6.30	0.90	0.60	0	0.50	38.10	-	24.60	3.50	14.30	37.20
HSP13D723B1	花岗岩	1 457	5.90	0.80	1.40	0	0.40	18.70	-	18.50	2.90	11.40	27.00
HSP13D724B1	花岗岩	2 200	5.20	1.00	1.50	<0.002	0.50	28.10	0.10	21.80	4.20	15.30	42.00
HSP13D725B1	花岗岩	2 005	6.20	0.90	0.90	0	0.40	31.10	-	25.30	3.10	10.60	39.60
HSP13D726B1	花岗岩	2 580	5.20	0.90	0.80	0	0.50	30.60	-	19.30	6.00	17.70	42.50
样品号	岩性	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb
HSP13D721B1	花岗岩	79.10	8.56	29.90	4.94	1.72	4.11	0.68	3.63	0.72	2.23	0.35	2.42
HSP13D722B1	花岗岩	63.60	6.89	24.30	3.74	1.26	3.28	0.49	2.55	0.49	1.39	0.23	1.49
HSP13D723B1	花岗岩	43.00	4.37	14.90	2.45	0.76	2.10	0.32	1.87	0.38	1.24	0.21	1.52
HSP13D724B1	花岗岩	63.50	6.38	22.70	3.33	1.17	3.10	0.48	2.58	0.48	1.55	0.28	1.94
HSP13D725B1	花岗岩	58.50	5.99	19.80	3.07	1.00	2.50	0.37	1.89	0.34	1.06	0.19	1.30
HSP13D726B1	花岗岩	64.30	6.54	22.70	3.60	1.16	3.22	0.54	2.82	0.58	1.89	0.31	2.05
样品号	岩性	Lu	ΣREE	LREE	HREE	LREE/HREE	(La/Yb)_N	δEu	δCe
HSP13D721B1	花岗岩	0.35	185.51	171.02	14.49	11.80	13.04	1.14	0.90
HSP13D722B1	花岗岩	0.23	147.13	136.99	10.14	13.50	16.83	1.08	0.91
HSP13D723B1	花岗岩	0.25	100.37	92.48	7.89	11.72	11.98	1.00	0.88
HSP13D724B1	花岗岩	0.31	149.79	139.08	10.71	12.98	14.60	1.10	0.85
HSP13D725B1	花岗岩	0.21	135.82	127.96	7.86	16.28	20.54	1.07	0.83
HSP13D726B1	花岗岩	0.33	152.54	140.80	11.74	11.99	13.98	1.02	0.85

Fig.3 Total alkali-silica (TAS) diagram of the Wuzhangshan pluton (base map after Middlemost[41])

Fig.4 Petrological discrimination diagrams for the Wuzhangshan pluton

Fig. 5 Chondrite-normalized REE patterns (a) and primitive mantle (PM)-normalized multi-element spider diagram (b) for the Wuzhangshan pluton(Chondrite and PM normalizing values from Sun and McDonough[44] )

Fig.6 Petrogenetic discrimination diagrams for the Wuzhangshan pluton

Table 2 Sr-Nd isotope compositions of samples from the Wuzhangshan pluton

样品	Rb/ 10^-6	Sr/ 10^-6	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr(2σ)	(⁸⁷Sr/ ⁸⁶Sr)_i	Sm/ 10^-6	Nd/ 10^-6	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd(2σ)	ε_Nd(0)	ε_Nd(t)	T_DM/ Ma	$T D M 2$ / Ma	(¹⁴³Nd/ ¹⁴⁴Nd)_i
HSP13D721B1	115	1 232	0.270 1	0.708 354 (10)	0.707 78	4.94	29.9	0.099 9	0.511 549 (8)	-21.2	-19.4	2 139	2 513	0.511 451
HSP13D722B1	111	947	0.339 1	0.708 026 (16)	0.707 30	3.74	24.3	0.093 0	0.511 621 (10)	-19.8	-17.9	1 928	2 389	0.511 530
HSP13D723B1	110	552	0.576 6	0.709 258 (11)	0.708 03	2.45	14.9	0.099 4	0.511 494 (6)	-22.3	-20.5	2 203	2 599	0.511 396
HSP13D724B1	123	625	0.569 5	0.709 105 (11)	0.707 89	3.33	22.7	0.088 7	0.511 584 (7)	-20.6	-18.5	1 906	2 441	0.511 497
HSP13D725B1	104	904	0.332 9	0.708 203 (12)	0.707 49	3.07	19.8	0.093 7	0.511 545 (6)	-21.3	-19.4	2 034	2 510	0.511 453
HSP13D726B1	116	4 190	0.080 1	0.708 226 (18)	0.708 06	3.60	22.7	0.095 9	0.511 528 (8)	-21.7	-19.7	2 094	2 540	0.511 434

Table 2 Sr-Nd isotope compositions of samples from the Wuzhangshan pluton

样品	Rb/ 10^-6	Sr/ 10^-6	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/ ⁸⁶Sr(2σ)	(⁸⁷Sr/ ⁸⁶Sr)_i	Sm/ 10^-6	Nd/ 10^-6	¹⁴⁷Sm/ ¹⁴⁴Nd	¹⁴³Nd/ ¹⁴⁴Nd(2σ)	ε_Nd(0)	ε_Nd(t)	T_DM/ Ma	$T D M 2$ / Ma	(¹⁴³Nd/ ¹⁴⁴Nd)_i
HSP13D721B1	115	1 232	0.270 1	0.708 354 (10)	0.707 78	4.94	29.9	0.099 9	0.511 549 (8)	-21.2	-19.4	2 139	2 513	0.511 451
HSP13D722B1	111	947	0.339 1	0.708 026 (16)	0.707 30	3.74	24.3	0.093 0	0.511 621 (10)	-19.8	-17.9	1 928	2 389	0.511 530
HSP13D723B1	110	552	0.576 6	0.709 258 (11)	0.708 03	2.45	14.9	0.099 4	0.511 494 (6)	-22.3	-20.5	2 203	2 599	0.511 396
HSP13D724B1	123	625	0.569 5	0.709 105 (11)	0.707 89	3.33	22.7	0.088 7	0.511 584 (7)	-20.6	-18.5	1 906	2 441	0.511 497
HSP13D725B1	104	904	0.332 9	0.708 203 (12)	0.707 49	3.07	19.8	0.093 7	0.511 545 (6)	-21.3	-19.4	2 034	2 510	0.511 453
HSP13D726B1	116	4 190	0.080 1	0.708 226 (18)	0.708 06	3.60	22.7	0.095 9	0.511 528 (8)	-21.7	-19.7	2 094	2 540	0.511 434

Table 3 Pb isotope compositions of samples from the Wuzhangshan pluton

样品	含量/10^-6			同位素比值			初始铅同位素比值
样品	Pb	Th	U	²⁰⁸Pb/²⁰⁴Pb (2σ)	²⁰⁷Pb/²⁰⁴Pb (2σ)	²⁰⁶Pb/²⁰⁴Pb (2σ)	(²⁰⁶Pb/ ²⁰⁴Pb)_i	(²⁰⁷Pb/ ²⁰⁴Pb)_i	(²⁰⁸Pb/ ²⁰⁴Pb)_i
HSP13D721B1	32.1	35.2	7.12	37.869(4)	15.442(2)	17.524(1)	17.215	15.427	37.327
HSP13D722B1	38.1	24.6	3.54	37.766(3)	15.427(1)	17.384(1)	17.164	15.416	36.994
HSP13D723B1	18.7	18.5	2.86	37.885(4)	15.444(2)	17.754(2)	17.518	15.432	36.861
HSP13D724B1	28.1	21.8	4.16	37.981(5)	15.470(2)	17.709(2)	17.418	15.455	37.109
HSP13D725B1	31.1	25.3	3.09	37.905(5)	15.457(2)	17.503(2)	17.317	15.448	37.152
HSP13D726B1	30.6	19.3	5.97	37.854(4)	15.436(2)	17.477(2)	17.005	15.412	36.869

Fig.7 Source region discrimination diagrams of the Wuzhangshan pluton

Fig.8 Plot of U-Pb age vs. εHf(t) for the Wuzhangshan pluton

Fig.9 206Pb/204Pb vs. 207Pb/204Pb (a) and 206Pb/204Pb vs. 208Pb/204Pb (b) diagrams for the Wuzhangshan pluton

Table 4 Age data statistics for the Wuzhangshan pluton

序号	年龄/Ma	测试方法	测试矿物	样品点数	资料来源
1	159	K-Ar	全岩	不详	河南省地质矿产局^[65]
2	155.4±3.5	K-Ar	全岩	不详	范光等^[66]
3	144.7±3.4	K-Ar	全岩	不详	范光等^[66]
4	156.8±1.2	SHRIMP U-Pb	锆石	14	李永峰^[27]
5	156.8±3.1	Ar-Ar	角闪石	13	Han等^[33]
6	157.0±1.0	SHRIMP U-Pb	锆石	14	Mao等^[28]
7	153.6±1.3	SHRIMP U-Pb	锆石	14	孟芳等^[29]
8	177.3±1.4	LA-ICP-MS U-Pb	锆石	15	庞绪成等^[31]
9	177.4±1.7	LA-ICP-MS U-Pb	锆石	15	庞绪成等^[31]
10	177.3±1.6	LA-ICP-MS U-Pb	锆石	15	庞绪成等^[31]
11	177.4±1.9	LA-ICP-MS U-Pb	锆石	14	庞绪成等^[31]
12	177.5±1.5	LA-ICP-MS U-Pb	锆石	17	庞绪成等^[31]
13	177.2±1.7	LA-ICP-MS U-Pb	锆石	14	庞绪成等^[31]
14	160.1±0.6	LA-ICP-MS U-Pb	锆石	29	Wang等^[20]
15	159.6±1.6	LA-ICP-MS U-Pb	锆石	18	梁涛等^[30]
16	157.2±1.1	LA-ICP-MS U-Pb	锆石	15	Zou等^[26]
17	156.4±1.1	LA-ICP-MS U-Pb	锆石	19	Zou等^[26]

Fig.10 Petrogenetic diagrams for the Wuzhangshan pluton

Fig.11 Petrogenesis discrimination diagrams of adakite rocks (after Lu et al.[76])

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