Geochemistry, Zircon U-Pb Chronology and Lu-Hf Isotope Characteristics of Monzogranites from Aishan Pluton in Jiaodong Peninsula

doi:10.19657/j.geoscience.1000-8527.2022.01.30

Abstract

Abstract:

The large-scale gold mineralization in Jiaodong Peninsula occurred from 125 to 110 Ma. Early Cretaceous Aishan pluton, coincided with the gold mineralization, is distributed in the eastern margin of North China Craton. Aishan pluton is composed of deep-facies quartz diorite-porphyry monzonitic granite and shallow-facies diorite porphyry, granite porphyry, etc., and develops mafic enclaves. Based on the studies of the petrography, geochemistry, zircon LA-ICP-MS U-Pb dating and Lu-Hf isotopic constitution of Aishan monzogranites, this paper discusses the petrologic classification, forming age, magmatic source and petrogenesis. Zircon U-Pb age of Aishan pluton is( 115±1)Ma. Aishan pluton is characterized by Na₂O>3.47, A/CNK<1.35, high Y content (8.2×10^-6-210.5×10^-6), low Sr/Y ratio (19.5-67.3), with obvious rare earth element fractionation (LREE/HREE=28.43-34.72, (La/Yb)_N=46.38-56.74), and negative Eu anomaly (δEu=0.75-0.83). Aishan pluton is a set of quasi-aluminous-weak peraluminous high-potassium calc-alkaline rock series, showing the characteristics of I-type granite. Aishan monzogranites have zircon ε_Hf(t) values of -19.7 to -16.0, and two-stage Hf model ages (T_DM2) vary in range of 2.18-2.42 Ga. According to the petrology, geochemistry and Lu-Hf isotopic constitution, combined with the results of previous studies on the genesis of Weideshan granite, the authors hold that Aishan monzogranites are a production of mixture between crustal acid magma and mantle intermediate-basic magma. The magma mainly derived from ancient Proterozoic and Neoarchean continental crust material.

Key words: Aishan pluton, monzogranite, zircon U-Pb age, Lu-Hf isotope, Jiaodong Peninsula

CLC Number:

P597
P588.12

LI Xiuzhang, WANG Ligong, LI Yixin, WANG Yingpeng, YU Xiaowei, ZHANG Wen, GUO Ruipeng, LIU Handong. Geochemistry, Zircon U-Pb Chronology and Lu-Hf Isotope Characteristics of Monzogranites from Aishan Pluton in Jiaodong Peninsula[J]. Geoscience, 2022, 36(01): 333-346.

Figures/Tables 13

References 58

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分析项	WDS- 01/3B	WDS- 05/1B	WDS- 09/2B	WDS- 13/1B	WDS- 05/2B			分析项	WDS- 01/3B	WDS- 05/1B	WDS- 09/2B	WDS- 13/1B	WDS- 05/2B	WDS- 05/3B	WDS- 06/2B
分析项	似斑状黑云母二长花岗岩				暗色包体			分析项	似斑状黑云母二长花岗岩				暗色包体
SiO₂	69.28	73.12	74.49	70.83	56.82	58.30	68.83	Th	23.5	27.1	29.5	21.5	14.6	19.8	19.9
TiO₂	0.37	0.28	0.20	0.25	0.90	0.73	0.34	U	3.0	3.3	6.2	3.0	6.9	4.8	3.2
Al₂O₃	14.59	13.55	14.01	14.90	16.46	15.87	15.12	Zr	167	200.8	151.9	162.6	230.5	267.3	195.5
Fe₂O₃	2.95	2.13	1.40	1.73	6.82	5.42	2.66	Pb	4.0	14	9.9	5.2	2.8	9.3	7.3
MgO	1.45	0.71	0.43	0.55	3.43	3.04	0.96	Ni	9.1	2.3	3.0	1.9	6.4	7.3	2.6
MnO	0.05	0.05	0.06	0.03	0.26	0.15	0.05	La	65.3	64.6	49.6	61.7	92.1	133.7	78.1
CaO	2.64	2.04	0.25	1.77	5.64	4.97	2.47	Ce	112.3	109.4	109.6	105.0	212.0	259.7	132.0
Na₂O	3.71	4.05	3.47	4.06	5.73	3.92	4.26	Pr	10.56	10.00	7.68	9.45	24.31	25.74	12.11
K₂O	4.13	3.27	3.90	4.73	1.79	5.37	4.45	Nd	34.7	31.2	24.1	29.3	85.8	92.8	38.0
P₂O₅	0.16	0.12	0.08	0.08	0.72	0.71	0.16	Sm	5.01	3.94	2.87	4.10	12.82	12.14	5.28
烧失量	0.4	0.5	1.6	0.8	1.2	1.1	0.4	Eu	1.03	0.91	0.61	0.84	2.29	2.83	1.15
总量	99.73	99.82	99.89	99.73	99.77	99.58	99.70	Gd	3.26	2.83	2.15	2.51	8.59	7.78	3.44
Na₂O/K₂O	0.90	1.24	0.89	0.86	3.20	0.73	0.96	Tb	0.37	0.33	0.25	0.31	1.03	0.82	0.41
Mg^#	52.01	42.36	40.38	41.21	52.58	55.29	44.31	Dy	1.90	1.56	1.24	1.51	4.92	3.87	1.92
A/NK	1.38	1.33	1.41	1.26	1.45	1.29	1.28	Ho	0.32	0.29	0.23	0.25	0.84	0.62	0.30
A/CNK	0.95	0.97	1.35	0.99	0.76	0.74	0.93	Er	0.91	0.73	0.75	0.80	2.46	1.60	1.00
Sc	5	3	2	2	16	8	3	Tm	0.14	0.13	0.11	0.12	0.37	0.24	0.15
V	47	26	18	21	103	91	36	Yb	1.01	0.91	0.75	0.78	2.83	1.41	0.97
Ba	1 000	463	366	1 274	188	1 351	1 112	Lu	0.14	0.14	0.12	0.13	0.45	0.26	0.15
Co	6.1	3.2	2.8	2.1	13.3	14.1	4.2	Y	10.50	8.70	8.20	8.50	27.90	19.30	10.00
Cs	1.0	1.2	1.3	1.2	2.8	1.9	2.2	ΣREE	236.95	226.97	200.06	216.80	450.81	543.51	274.98
Ga	17.5	18.7	18.0	17.6	27.0	18.5	18.5	LREE	228.90	220.05	194.46	210.39	429.32	526.91	266.64
Hf	4.8	5.5	4.5	4.4	6.3	6.0	5.1	HREE	8.05	6.92	5.60	6.41	21.49	16.60	8.34
Nb	10.7	13.5	14.4	11.3	39.4	16.1	12.8	LREE/ HREE	28.43	31.80	34.73	32.82	19.98	31.74	31.97
Rb	125.5	135.6	165.6	159.7	151.2	260.0	178.0	(La/Yb)_N	46.38	50.92	47.44	56.74	23.34	68.02	57.75
Sr	631	481	160	572	334	759	632	δEu	0.78	0.83	0.75	0.80	0.67	0.89	0.82
Ta	0.8	1.0	0.9	0.8	2.2	0.8	1.2	δCe	1.05	1.06	1.38	1.07	1.10	1.09	1.05

分析项	WDS- 01/3B	WDS- 05/1B	WDS- 09/2B	WDS- 13/1B	WDS- 05/2B			分析项	WDS- 01/3B	WDS- 05/1B	WDS- 09/2B	WDS- 13/1B	WDS- 05/2B	WDS- 05/3B	WDS- 06/2B
分析项	似斑状黑云母二长花岗岩				暗色包体			分析项	似斑状黑云母二长花岗岩				暗色包体
SiO₂	69.28	73.12	74.49	70.83	56.82	58.30	68.83	Th	23.5	27.1	29.5	21.5	14.6	19.8	19.9
TiO₂	0.37	0.28	0.20	0.25	0.90	0.73	0.34	U	3.0	3.3	6.2	3.0	6.9	4.8	3.2
Al₂O₃	14.59	13.55	14.01	14.90	16.46	15.87	15.12	Zr	167	200.8	151.9	162.6	230.5	267.3	195.5
Fe₂O₃	2.95	2.13	1.40	1.73	6.82	5.42	2.66	Pb	4.0	14	9.9	5.2	2.8	9.3	7.3
MgO	1.45	0.71	0.43	0.55	3.43	3.04	0.96	Ni	9.1	2.3	3.0	1.9	6.4	7.3	2.6
MnO	0.05	0.05	0.06	0.03	0.26	0.15	0.05	La	65.3	64.6	49.6	61.7	92.1	133.7	78.1
CaO	2.64	2.04	0.25	1.77	5.64	4.97	2.47	Ce	112.3	109.4	109.6	105.0	212.0	259.7	132.0
Na₂O	3.71	4.05	3.47	4.06	5.73	3.92	4.26	Pr	10.56	10.00	7.68	9.45	24.31	25.74	12.11
K₂O	4.13	3.27	3.90	4.73	1.79	5.37	4.45	Nd	34.7	31.2	24.1	29.3	85.8	92.8	38.0
P₂O₅	0.16	0.12	0.08	0.08	0.72	0.71	0.16	Sm	5.01	3.94	2.87	4.10	12.82	12.14	5.28
烧失量	0.4	0.5	1.6	0.8	1.2	1.1	0.4	Eu	1.03	0.91	0.61	0.84	2.29	2.83	1.15
总量	99.73	99.82	99.89	99.73	99.77	99.58	99.70	Gd	3.26	2.83	2.15	2.51	8.59	7.78	3.44
Na₂O/K₂O	0.90	1.24	0.89	0.86	3.20	0.73	0.96	Tb	0.37	0.33	0.25	0.31	1.03	0.82	0.41
Mg^#	52.01	42.36	40.38	41.21	52.58	55.29	44.31	Dy	1.90	1.56	1.24	1.51	4.92	3.87	1.92
A/NK	1.38	1.33	1.41	1.26	1.45	1.29	1.28	Ho	0.32	0.29	0.23	0.25	0.84	0.62	0.30
A/CNK	0.95	0.97	1.35	0.99	0.76	0.74	0.93	Er	0.91	0.73	0.75	0.80	2.46	1.60	1.00
Sc	5	3	2	2	16	8	3	Tm	0.14	0.13	0.11	0.12	0.37	0.24	0.15
V	47	26	18	21	103	91	36	Yb	1.01	0.91	0.75	0.78	2.83	1.41	0.97
Ba	1 000	463	366	1 274	188	1 351	1 112	Lu	0.14	0.14	0.12	0.13	0.45	0.26	0.15
Co	6.1	3.2	2.8	2.1	13.3	14.1	4.2	Y	10.50	8.70	8.20	8.50	27.90	19.30	10.00
Cs	1.0	1.2	1.3	1.2	2.8	1.9	2.2	ΣREE	236.95	226.97	200.06	216.80	450.81	543.51	274.98
Ga	17.5	18.7	18.0	17.6	27.0	18.5	18.5	LREE	228.90	220.05	194.46	210.39	429.32	526.91	266.64
Hf	4.8	5.5	4.5	4.4	6.3	6.0	5.1	HREE	8.05	6.92	5.60	6.41	21.49	16.60	8.34
Nb	10.7	13.5	14.4	11.3	39.4	16.1	12.8	LREE/ HREE	28.43	31.80	34.73	32.82	19.98	31.74	31.97
Rb	125.5	135.6	165.6	159.7	151.2	260.0	178.0	(La/Yb)_N	46.38	50.92	47.44	56.74	23.34	68.02	57.75
Sr	631	481	160	572	334	759	632	δEu	0.78	0.83	0.75	0.80	0.67	0.89	0.82
Ta	0.8	1.0	0.9	0.8	2.2	0.8	1.2	δCe	1.05	1.06	1.38	1.07	1.10	1.09	1.05

点号	Pb/ 10^-6	Th/ 10^-6	U/ 10^-6	Th/U	同位素比值			²⁰⁷Pb/²⁰⁶Pb /Ma±1σ	²⁰⁷Pb/²³⁵U /Ma±1σ	²⁰⁶Pb/²³⁸U /Ma±1σ
点号	Pb/ 10^-6	Th/ 10^-6	U/ 10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶Pb /Ma±1σ	²⁰⁷Pb/²³⁵U /Ma±1σ	²⁰⁶Pb/²³⁸U /Ma±1σ
WDS05/1B-01	441	4 602	542	8.49	0.051 79±0.002 61	0.123±0.005 1	0.017 69±0.000 33	276±110	118±5	113±2
WDS05/1B-02	925	9 503	697	13.64	0.051 10±0.001 98	0.126±0.004 6	0.018 20±0.000 31	256±89	121±4	116±2
WDS05/1B-03	1 252	13 061	700	18.65	0.050 11±0.002 04	0.120±0.004 4	0.017 70±0.000 30	198±99	115±4	113±2
WDS05/1B-04	527	5 302	403	13.16	0.052 29±0.003 01	0.129±0.007 0	0.018 39±0.000 35	298±136	124±6	117±2
WDS05/1B-05	856	8 273	428	19.33	0.049 75±0.002 70	0.121±0.006 3	0.017 84±0.000 33	183±126	116±6	114±2
WDS05/1B-06	853	8 368	456	18.35	0.049 43±0.002 15	0.121±0.005 1	0.018 17±0.000 37	169±134	117±5	116±2
WDS05/1B-07	1 368	13 397	490	27.32	0.050 39±0.002 45	0.121±0.005 4	0.017 81±0.000 36	213±111	116±5	114±2
WDS05/1B-09	497	5 690	267	21.34	0.056 38±0.004 61	0.129±0.011 0	0.017 96±0.000 65	478±181	124±9	115±4
WDS05/1B-10	1 027	10 478	502	20.86	0.052 89±0.002 55	0.124±0.007 2	0.018 18±0.000 37	324±111	119±7	116±2
WDS05/1B-11	491	4 994	382	13.09	0.055 49±0.003 31	0.123±0.008 9	0.017 80±0.000 39	432±131	118±8	114±2
WDS05/1B-12	342	3 463	343	10.10	0.055 81±0.003 38	0.119±0.010 0	0.017 69±0.000 46	456±135	115±9	113±3
WDS05/1B-13	430	4 390	468	9.37	0.056 21±0.003 26	0.123±0.012 0	0.017 81±0.000 44	461±128	118±11	114±3
WDS05/1B-14	580	6 496	691	9.41	0.055 68±0.004 30	0.116±0.014 0	0.017 33±0.000 52	439±177	112±13	111±3
WDS05/1B-15	318	3 384	521	6.50	0.059 56±0.007 03	0.124±0.018 0	0.018 17±0.000 92	587±262	119±17	116±6
WDS05/1B-16	144	1 686	487	3.46	0.061 18±0.007 06	0.126±0.019 0	0.018 39±0.001 15	656±250	120±18	117±7
WDS05/1B-17	64	679	452	1.50	0.060 34±0.007 96	0.123±0.024 0	0.018 19±0.000 90	617±288	118±22	116±6
WDS05/1B-18	13	447	631	0.71	0.061 46±0.004 22	0.127±0.019 0	0.018 33±0.000 50	654±147	121±18	117±3
WDS05/1B-19	13	443	623	0.71	0.058 04±0.006 86	0.122±0.020 0	0.018 30±0.000 66	532±261	117±18	117±4
WDS05/1B-20	10	296	479	0.62	0.058 82±0.007 87	0.128±0.023 0	0.018 44±0.002 12	561±294	123±21	118±13
WDS05/1B-21	15	447	772	0.58	0.056 75±0.003 00	0.122±0.012 0	0.017 84±0.000 39	483±117	117±11	114±2
WDS05/1B-22	6	178	304	0.59	0.059 88±0.008 31	0.134±0.018 0	0.018 98±0.000 91	598±306	128±17	121±6
WDS05/1B-23	12	341	568	0.60	0.053 89±0.006 62	0.125±0.018 0	0.018 10±0.000 89	365±280	120±16	116±6
WDS05/1B-24	22	1 012	1 054	0.96	0.053 95±0.003 65	0.124±0.010 0	0.017 50±0.000 49	369±156	119±9	112±3

点号	Pb/ 10^-6	Th/ 10^-6	U/ 10^-6	Th/U	同位素比值			²⁰⁷Pb/²⁰⁶Pb /Ma±1σ	²⁰⁷Pb/²³⁵U /Ma±1σ	²⁰⁶Pb/²³⁸U /Ma±1σ
点号	Pb/ 10^-6	Th/ 10^-6	U/ 10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	²⁰⁷Pb/²³⁵U	²⁰⁶Pb/²³⁸U	²⁰⁷Pb/²⁰⁶Pb /Ma±1σ	²⁰⁷Pb/²³⁵U /Ma±1σ	²⁰⁶Pb/²³⁸U /Ma±1σ
WDS05/1B-01	441	4 602	542	8.49	0.051 79±0.002 61	0.123±0.005 1	0.017 69±0.000 33	276±110	118±5	113±2
WDS05/1B-02	925	9 503	697	13.64	0.051 10±0.001 98	0.126±0.004 6	0.018 20±0.000 31	256±89	121±4	116±2
WDS05/1B-03	1 252	13 061	700	18.65	0.050 11±0.002 04	0.120±0.004 4	0.017 70±0.000 30	198±99	115±4	113±2
WDS05/1B-04	527	5 302	403	13.16	0.052 29±0.003 01	0.129±0.007 0	0.018 39±0.000 35	298±136	124±6	117±2
WDS05/1B-05	856	8 273	428	19.33	0.049 75±0.002 70	0.121±0.006 3	0.017 84±0.000 33	183±126	116±6	114±2
WDS05/1B-06	853	8 368	456	18.35	0.049 43±0.002 15	0.121±0.005 1	0.018 17±0.000 37	169±134	117±5	116±2
WDS05/1B-07	1 368	13 397	490	27.32	0.050 39±0.002 45	0.121±0.005 4	0.017 81±0.000 36	213±111	116±5	114±2
WDS05/1B-09	497	5 690	267	21.34	0.056 38±0.004 61	0.129±0.011 0	0.017 96±0.000 65	478±181	124±9	115±4
WDS05/1B-10	1 027	10 478	502	20.86	0.052 89±0.002 55	0.124±0.007 2	0.018 18±0.000 37	324±111	119±7	116±2
WDS05/1B-11	491	4 994	382	13.09	0.055 49±0.003 31	0.123±0.008 9	0.017 80±0.000 39	432±131	118±8	114±2
WDS05/1B-12	342	3 463	343	10.10	0.055 81±0.003 38	0.119±0.010 0	0.017 69±0.000 46	456±135	115±9	113±3
WDS05/1B-13	430	4 390	468	9.37	0.056 21±0.003 26	0.123±0.012 0	0.017 81±0.000 44	461±128	118±11	114±3
WDS05/1B-14	580	6 496	691	9.41	0.055 68±0.004 30	0.116±0.014 0	0.017 33±0.000 52	439±177	112±13	111±3
WDS05/1B-15	318	3 384	521	6.50	0.059 56±0.007 03	0.124±0.018 0	0.018 17±0.000 92	587±262	119±17	116±6
WDS05/1B-16	144	1 686	487	3.46	0.061 18±0.007 06	0.126±0.019 0	0.018 39±0.001 15	656±250	120±18	117±7
WDS05/1B-17	64	679	452	1.50	0.060 34±0.007 96	0.123±0.024 0	0.018 19±0.000 90	617±288	118±22	116±6
WDS05/1B-18	13	447	631	0.71	0.061 46±0.004 22	0.127±0.019 0	0.018 33±0.000 50	654±147	121±18	117±3
WDS05/1B-19	13	443	623	0.71	0.058 04±0.006 86	0.122±0.020 0	0.018 30±0.000 66	532±261	117±18	117±4
WDS05/1B-20	10	296	479	0.62	0.058 82±0.007 87	0.128±0.023 0	0.018 44±0.002 12	561±294	123±21	118±13
WDS05/1B-21	15	447	772	0.58	0.056 75±0.003 00	0.122±0.012 0	0.017 84±0.000 39	483±117	117±11	114±2
WDS05/1B-22	6	178	304	0.59	0.059 88±0.008 31	0.134±0.018 0	0.018 98±0.000 91	598±306	128±17	121±6
WDS05/1B-23	12	341	568	0.60	0.053 89±0.006 62	0.125±0.018 0	0.018 10±0.000 89	365±280	120±16	116±6
WDS05/1B-24	22	1 012	1 054	0.96	0.053 95±0.003 65	0.124±0.010 0	0.017 50±0.000 49	369±156	119±9	112±3

样品号	T/Ma	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(t)	T_DM1/ Ma	T_DMC/ Ma	f_Lu/Hf
WDS05/1B-01	113	0.050 201	0.001 405	0.001 215	0.000 031	0.282 209	0.000 018	0.282 207	-17.5	1 479	2 283	-0.96
WDS05/1B-02	116	0.056 054	0.002 032	0.001 596	0.000 074	0.282 149	0.000 026	0.282 146	-19.6	1 579	2 417	-0.95
WDS05/1B-03	113	0.047 160	0.000 961	0.001 171	0.000 016	0.282 200	0.000 018	0.282 197	-17.8	1 490	2 304	-0.96
WDS05/1B-04	117	0.026 963	0.000 475	0.000 682	0.000 010	0.282 157	0.000 017	0.282 156	-19.2	1 530	2 394	-0.98
WDS05/1B-05	114	0.037 897	0.000 757	0.000 974	0.000 018	0.282 166	0.000 019	0.282 164	-19.0	1 530	2 379	-0.97
WDS05/1B-06	117	0.050 562	0.001 965	0.001 461	0.000 089	0.282 251	0.000 025	0.282 248	-16.0	1 429	2 189	-0.96
WDS05/1B-07	115	0.055 816	0.001 700	0.001 837	0.000 048	0.282 203	0.000 024	0.282 199	-17.7	1 512	2 298	-0.94
WDS05/1B-08	116	0.041 943	0.001 032	0.001 156	0.000 052	0.282 198	0.000 022	0.282 195	-17.9	1 492	2 307	-0.97
WDS05/1B-09	114	0.026 770	0.000 726	0.000 758	0.000 027	0.282 175	0.000 021	0.282 174	-18.7	1 508	2 356	-0.98
WDS05/1B-10	113	0.064 417	0.004 580	0.001 648	0.000 112	0.282 208	0.000 021	0.282 204	-17.6	1 498	2 288	-0.95
WDS05/1B-11	114	0.032 818	0.000 481	0.000 862	0.000 010	0.282 172	0.000 018	0.282 170	-18.8	1 517	2 365	-0.97
WDS05/1B-12	116	0.038 670	0.001 204	0.000 966	0.000 021	0.282 167	0.000 020	0.282 165	-18.9	1 527	2 373	-0.97
WDS05/1B-13	117	0.038 502	0.000 922	0.000 989	0.000 020	0.282 185	0.000 015	0.282 183	-18.3	1 503	2 333	-0.97
WDS05/1B-14	116	0.031 310	0.000 521	0.000 856	0.000 014	0.282 203	0.000 017	0.282 201	-17.6	1 474	2 294	-0.97
WDS05/1B-15	117	0.044 502	0.000 871	0.001 335	0.000 050	0.282 204	0.000 018	0.282 201	-17.6	1 490	2 292	-0.96
WDS05/1B-16	117	0.033 978	0.000 892	0.001 006	0.000 032	0.282 206	0.000 017	0.282 204	-17.5	1 475	2 288	-0.97
WDS05/1B-17	118	0.045 049	0.000 589	0.001 154	0.000 013	0.282 192	0.000 020	0.282 190	-18.0	1 500	2 318	-0.97
WDS05/1B-18	114	0.038 873	0.001 155	0.001 181	0.000 068	0.282 186	0.000 016	0.282 183	-18.3	1 510	2 334	-0.96
WDS05/1B-19	121	0.046 983	0.001 131	0.001 163	0.000 027	0.282 206	0.000 018	0.282 204	-17.4	1 481	2 284	-0.96
WDS05/1B-20	116	0.029 679	0.000 417	0.000 798	0.000 010	0.282 144	0.000 018	0.282 143	-19.7	1 552	2 424	-0.98