Geochronology and Petrogeochemical Characteristics of I-type Granites in Xinlitun Area, Northern Greater Hinggan Mountains and Their Geological Significance

doi:10.19657/j.geoscience.1000-8527.2022.092

Abstract

Abstract:

There are voluminous Phanerozoic granites in the Greater Hinggan Mountains. In this paper, zircon U-Pb geochronology and geochemistry of the Xinlitun granites in the northern Greater Hinggan Mountains have been studied. We compared the geochemical characteristics of these Late Mesozoic granites, and discussed their formation age, genesis and geological significance. Zircon LA-ICP-MS U-Pb dating indicates that the medium-fine-grained monzogranite and medium-fine-grained granodiorite were both formed in the Early Jurassic, at (187.2±2.3) Ma and (192.4±1.6) Ma, respectively. Whole-rock geochemical results show that these granites are Si-rich, high in alkalis (K-rich), and contain low Mg, P, Ti, and ^TFeO/MgO. The rocks are enriched in light rare earth elements and large ion lithophile elements (e.g., Rb, Ba, Th, K), but depleted in heavy rare earth elements and high-field strength elements (e.g., Ta, Nb, P, Ti). No distinct negative Eu anomalies have been identified. The contents of P₂O₅ and Al₂O₃ decrease with increasing SiO₂. Collectively, we suggested that these granites are moderately differentiated I-type. The petrological and geochemical features indicate that their primary magmas were originated from a mixed crust-mantle source. Considering the regional tectonic background, we suggested that these Early Jurassic granites were formed in a syn-collision volcanic arc setting, closely related to the southward subduction of Mongolia-Okhotsk Ocean.

Key words: northern Greater Hinggan Mountains, I-type granite, Early Jurassic, zircon U-Pb age, petrogeochemistry, Mongolia-Okhotsk Ocean

CLC Number:

P588.12

ZHANG Guobin, KONG Jingui, WU Zijie, FENG Yue, HE Yunlong, CHEN Xingkai. Geochronology and Petrogeochemical Characteristics of I-type Granites in Xinlitun Area, Northern Greater Hinggan Mountains and Their Geological Significance[J]. Geoscience, 2023, 37(02): 404-418.

Figures/Tables 12

References 80

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点号	含量(10^-6)		Th/ U	同位素比值						年龄(Ma)
点号	U	Th	Th/ U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
TPC1-1	3177	698	0.23	0.0531	0.0120	0.2204	0.0170	0.0301	0.0012	251	2.80	179.1	3.40	190.8	2.30
TPC1-2	847	252	0.31	0.0478	0.0280	0.1942	0.0320	0.0295	0.0014	225	8.80	199.3	9.70	187.8	2.60
TPC1-3	2346	636	0.28	0.0505	0.0140	0.2061	0.0190	0.0296	0.0013	316	3.10	199.1	3.90	188.5	2.30
TPC1-4	2675	1982	0.77	0.0532	0.0210	0.2182	0.0240	0.0297	0.0012	260	5.10	185.3	3.00	188.4	2.30
TPC1-5	1880	527	0.29	0.0498	0.0160	0.1992	0.0200	0.0290	0.0013	207	3.80	186.6	4.00	184.6	2.30
TPC1-6	1988	862	0.45	0.0523	0.0140	0.2143	0.0190	0.0297	0.0012	258	5.20	184.5	4.50	188.3	2.30
TPC1-7	987	275	0.29	0.0509	0.0330	0.2057	0.0380	0.0293	0.0180	268	7.70	189.3	7.00	186.5	3.30
TPC1-8	1631	272	0.17	0.0491	0.0160	0.1937	0.0210	0.0290	0.0013	239	3.80	196.2	5.30	182.2	2.30
TPC4-1	705	120	0.18	0.0519	0.0280	0.2180	0.0310	0.0305	0.0014	213	7.90	178.0	11.00	193.1	2.80
TPC4-2	2173	517	0.25	0.0515	0.0140	0.2139	0.0190	0.0301	0.0012	288	6.10	191.7	9.00	191.3	2.40
TPC4-3	3577	1064	0.31	0.0475	0.0120	0.1961	0.0170	0.0300	0.0012	253	2.70	208.1	6.00	191.2	2.30
TPC4-4	3184	1045	0.34	0.0507	0.0120	0.2128	0.0170	0.0304	0.0012	244	4.50	193.7	5.10	193.2	2.40
TPC4-5	4711	1212	0.27	0.0507	0.9000	0.2155	0.0150	0.0302	0.0012	205	2.20	192.5	3.40	195.5	2.30
TPC4-6	3769	1176	0.32	0.0511	0.0100	0.2132	0.0160	0.0303	0.0012	350	2.40	202.9	5.70	192.6	2.30
TPC4-7	3601	791	0.23	0.0509	0.0100	0.2126	0.0160	0.0303	0.0012	196	3.00	185.8	5.30	192.0	2.30
TPC4-8	2948	884	0.31	0.0517	0.0140	0.2133	0.0180	0.0299	0.0120	311	3.10	194.0	3.70	190.2	2.30

点号	含量(10^-6)		Th/ U	同位素比值						年龄(Ma)
点号	U	Th	Th/ U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
TPC1-1	3177	698	0.23	0.0531	0.0120	0.2204	0.0170	0.0301	0.0012	251	2.80	179.1	3.40	190.8	2.30
TPC1-2	847	252	0.31	0.0478	0.0280	0.1942	0.0320	0.0295	0.0014	225	8.80	199.3	9.70	187.8	2.60
TPC1-3	2346	636	0.28	0.0505	0.0140	0.2061	0.0190	0.0296	0.0013	316	3.10	199.1	3.90	188.5	2.30
TPC1-4	2675	1982	0.77	0.0532	0.0210	0.2182	0.0240	0.0297	0.0012	260	5.10	185.3	3.00	188.4	2.30
TPC1-5	1880	527	0.29	0.0498	0.0160	0.1992	0.0200	0.0290	0.0013	207	3.80	186.6	4.00	184.6	2.30
TPC1-6	1988	862	0.45	0.0523	0.0140	0.2143	0.0190	0.0297	0.0012	258	5.20	184.5	4.50	188.3	2.30
TPC1-7	987	275	0.29	0.0509	0.0330	0.2057	0.0380	0.0293	0.0180	268	7.70	189.3	7.00	186.5	3.30
TPC1-8	1631	272	0.17	0.0491	0.0160	0.1937	0.0210	0.0290	0.0013	239	3.80	196.2	5.30	182.2	2.30
TPC4-1	705	120	0.18	0.0519	0.0280	0.2180	0.0310	0.0305	0.0014	213	7.90	178.0	11.00	193.1	2.80
TPC4-2	2173	517	0.25	0.0515	0.0140	0.2139	0.0190	0.0301	0.0012	288	6.10	191.7	9.00	191.3	2.40
TPC4-3	3577	1064	0.31	0.0475	0.0120	0.1961	0.0170	0.0300	0.0012	253	2.70	208.1	6.00	191.2	2.30
TPC4-4	3184	1045	0.34	0.0507	0.0120	0.2128	0.0170	0.0304	0.0012	244	4.50	193.7	5.10	193.2	2.40
TPC4-5	4711	1212	0.27	0.0507	0.9000	0.2155	0.0150	0.0302	0.0012	205	2.20	192.5	3.40	195.5	2.30
TPC4-6	3769	1176	0.32	0.0511	0.0100	0.2132	0.0160	0.0303	0.0012	350	2.40	202.9	5.70	192.6	2.30
TPC4-7	3601	791	0.23	0.0509	0.0100	0.2126	0.0160	0.0303	0.0012	196	3.00	185.8	5.30	192.0	2.30
TPC4-8	2948	884	0.31	0.0517	0.0140	0.2133	0.0180	0.0299	0.0120	311	3.10	194.0	3.70	190.2	2.30

样品号	岩性	SiO₂	Al₂O₃	Fe₂O₃	FeO	MgO	CaO	Na₂O	K₂O	MnO	P₂O₅	TiO₂	烧失量	总量	Na₂O/ K₂O
TPC-1	中细粒二长花岗岩	72.48	14.84	1.08	0.52	0.31	1.09	4.21	3.79	0.06	0.07	0.26	0.96	99.67	1.11
TPC-2	中细粒二长花岗岩	71.78	15.42	0.72	1.11	0.46	1.56	4.95	3.04	0.08	0.11	0.28	0.39	99.90	1.63
TPC-3	中细粒二长花岗岩	75.30	14.08	0.40	0.37	0.13	1.33	3.80	3.99	0.05	0.09	0.25	0.43	99.22	0.95
TPC-4	中细粒花岗闪长岩	70.51	16.75	1.32	1.18	0.36	1.85	4.26	2.53	0.05	0.05	0.19	0.92	99.97	1.68
TPC-5	中细粒花岗闪长岩	69.04	17.75	1.12	1.43	0.41	1.64	4.52	2.69	0.04	0.07	0.21	1.13	100.05	1.68
TPC-6	中细粒花岗闪长岩	70.83	15.82	1.17	1.25	0.27	1.89	4.34	2.81	0.07	0.03	0.18	1.32	99.98	1.54
样品号	岩性	A/ NK	A/ CNK	σ	DI	SI	AR	^TFeO	^TFeO/MgO		Mg^#	La	Ce	Pr	Nd
TPC-1	中细粒二长花岗岩	1.34	1.14	2.17	88.82	3.11	3.02	1.49	4.81		27.00	13.50	29.10	3.38	12.60
TPC-2	中细粒二长花岗岩	1.35	1.08	2.22	87.02	4.47	2.78	1.76	3.82		32.00	18.40	39.80	4.88	18.20
TPC-3	中细粒二长花岗岩	1.33	1.08	1.88	94.84	1.34	3.04	0.73	5.61		24.00	12.85	17.63	3.16	11.59
TPC-4	中细粒花岗闪长岩	1.72	1.28	1.68	86.59	3.73	2.14	2.37	6.58		21.00	19.00	43.90	6.36	27.40
TPC-5	中细粒花岗闪长岩	1.71	1.33	2.00	84.31	4.06	2.18	2.44	5.95		23.00	13.65	28.20	3.41	12.43
TPC-6	中细粒花岗闪长岩	1.55	1.16	1.84	90.67	2.72	2.35	2.30	8.53		17.00	12.20	26.80	3.09	11.30
样品号	岩性	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	LREE/ HREE	δEu	δCe
TPC-1	中细粒二长花岗岩	2.12	0.68	1.50	0.24	1.12	0.20	0.60	0.09	0.60	0.09	5.44	13.82	1.11	1.01
TPC-2	中细粒二长花岗岩	3.08	0.74	2.17	0.32	1.52	0.26	0.80	0.12	0.71	0.10	7.20	14.18	0.83	0.99
TPC-3	中细粒二长花岗岩	1.97	0.62	1.43	0.19	0.99	0.16	0.53	0.08	0.56	0.07	4.63	11.93	1.08	0.65
TPC-4	中细粒花岗闪长岩	5.48	1.54	3.87	0.78	4.45	0.85	2.50	0.36	2.38	0.36	24.60	6.67	0.97	0.96
TPC-5	中细粒花岗闪长岩	2.15	0.57	1.69	0.21	0.90	0.17	0.52	0.07	0.49	0.08	4.04	14.63	0.89	0.97
TPC-6	中细粒花岗闪长岩	1.76	0.53	1.32	0.18	0.73	0.13	0.42	0.06	0.46	0.07	1.94	16.49	1.02	1.03
样品号	岩性	Rb	Ba	Sr	U	Nb	Ta	Zr	Hf	Th	Cr	Sc	Rb/Sr	Nb/Ta	Zr/Hf
TPC-1	中细粒二长花岗岩	91.6	671	326	0.42	5.83	0.62	76.30	1.80	6.76	14.80	3.84	0.28	9.40	42.39
TPC-2	中细粒二长花岗岩	90.2	636	466	0.88	4.88	0.50	87.80	1.90	6.15	16.80	3.79	0.19	9.76	46.21
TPC-3	中细粒二长花岗岩	157.0	855	456	1.07	8.34	1.00	94.50	2.50	5.40	12.40	4.00	0.34	8.34	37.80
TPC-4	中细粒花岗闪长岩	30.6	896	581	0.96	7.19	0.52	126.00	2.75	1.90	20.40	12.60	0.05	13.83	45.82
TPC-5	中细粒花岗闪长岩	113.0	409	405	0.86	4.23	0.51	73.30	1.70	4.51	11.20	4.40	0.28	8.29	43.12
TPC-6	中细粒花岗闪长岩	112.0	718	150	0.75	3.76	0.36	99.00	2.30	3.30	13.00	3.16	0.75	10.44	43.04

样品号	岩性	SiO₂	Al₂O₃	Fe₂O₃	FeO	MgO	CaO	Na₂O	K₂O	MnO	P₂O₅	TiO₂	烧失量	总量	Na₂O/ K₂O
TPC-1	中细粒二长花岗岩	72.48	14.84	1.08	0.52	0.31	1.09	4.21	3.79	0.06	0.07	0.26	0.96	99.67	1.11
TPC-2	中细粒二长花岗岩	71.78	15.42	0.72	1.11	0.46	1.56	4.95	3.04	0.08	0.11	0.28	0.39	99.90	1.63
TPC-3	中细粒二长花岗岩	75.30	14.08	0.40	0.37	0.13	1.33	3.80	3.99	0.05	0.09	0.25	0.43	99.22	0.95
TPC-4	中细粒花岗闪长岩	70.51	16.75	1.32	1.18	0.36	1.85	4.26	2.53	0.05	0.05	0.19	0.92	99.97	1.68
TPC-5	中细粒花岗闪长岩	69.04	17.75	1.12	1.43	0.41	1.64	4.52	2.69	0.04	0.07	0.21	1.13	100.05	1.68
TPC-6	中细粒花岗闪长岩	70.83	15.82	1.17	1.25	0.27	1.89	4.34	2.81	0.07	0.03	0.18	1.32	99.98	1.54
样品号	岩性	A/ NK	A/ CNK	σ	DI	SI	AR	^TFeO	^TFeO/MgO		Mg^#	La	Ce	Pr	Nd
TPC-1	中细粒二长花岗岩	1.34	1.14	2.17	88.82	3.11	3.02	1.49	4.81		27.00	13.50	29.10	3.38	12.60
TPC-2	中细粒二长花岗岩	1.35	1.08	2.22	87.02	4.47	2.78	1.76	3.82		32.00	18.40	39.80	4.88	18.20
TPC-3	中细粒二长花岗岩	1.33	1.08	1.88	94.84	1.34	3.04	0.73	5.61		24.00	12.85	17.63	3.16	11.59
TPC-4	中细粒花岗闪长岩	1.72	1.28	1.68	86.59	3.73	2.14	2.37	6.58		21.00	19.00	43.90	6.36	27.40
TPC-5	中细粒花岗闪长岩	1.71	1.33	2.00	84.31	4.06	2.18	2.44	5.95		23.00	13.65	28.20	3.41	12.43
TPC-6	中细粒花岗闪长岩	1.55	1.16	1.84	90.67	2.72	2.35	2.30	8.53		17.00	12.20	26.80	3.09	11.30
样品号	岩性	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	LREE/ HREE	δEu	δCe
TPC-1	中细粒二长花岗岩	2.12	0.68	1.50	0.24	1.12	0.20	0.60	0.09	0.60	0.09	5.44	13.82	1.11	1.01
TPC-2	中细粒二长花岗岩	3.08	0.74	2.17	0.32	1.52	0.26	0.80	0.12	0.71	0.10	7.20	14.18	0.83	0.99
TPC-3	中细粒二长花岗岩	1.97	0.62	1.43	0.19	0.99	0.16	0.53	0.08	0.56	0.07	4.63	11.93	1.08	0.65
TPC-4	中细粒花岗闪长岩	5.48	1.54	3.87	0.78	4.45	0.85	2.50	0.36	2.38	0.36	24.60	6.67	0.97	0.96
TPC-5	中细粒花岗闪长岩	2.15	0.57	1.69	0.21	0.90	0.17	0.52	0.07	0.49	0.08	4.04	14.63	0.89	0.97
TPC-6	中细粒花岗闪长岩	1.76	0.53	1.32	0.18	0.73	0.13	0.42	0.06	0.46	0.07	1.94	16.49	1.02	1.03
样品号	岩性	Rb	Ba	Sr	U	Nb	Ta	Zr	Hf	Th	Cr	Sc	Rb/Sr	Nb/Ta	Zr/Hf
TPC-1	中细粒二长花岗岩	91.6	671	326	0.42	5.83	0.62	76.30	1.80	6.76	14.80	3.84	0.28	9.40	42.39
TPC-2	中细粒二长花岗岩	90.2	636	466	0.88	4.88	0.50	87.80	1.90	6.15	16.80	3.79	0.19	9.76	46.21
TPC-3	中细粒二长花岗岩	157.0	855	456	1.07	8.34	1.00	94.50	2.50	5.40	12.40	4.00	0.34	8.34	37.80
TPC-4	中细粒花岗闪长岩	30.6	896	581	0.96	7.19	0.52	126.00	2.75	1.90	20.40	12.60	0.05	13.83	45.82
TPC-5	中细粒花岗闪长岩	113.0	409	405	0.86	4.23	0.51	73.30	1.70	4.51	11.20	4.40	0.28	8.29	43.12
TPC-6	中细粒花岗闪长岩	112.0	718	150	0.75	3.76	0.36	99.00	2.30	3.30	13.00	3.16	0.75	10.44	43.04

序号	位置	岩性	年龄(Ma)	数据来源
1	西林吉岩体(52°49'03″N,123°36'04″E)	二长花岗岩	193±2.0	文献[2]
2	绿林岩体(52°27'59″N,123°05'00″E)	碱长花岗岩	187±2.0	文献[2]
3	大洋山钼矿(50°20'-50°40'N,124°30'-125°00'E)	中细粒二长花岗岩	177.3±2.6	文献[3]
4	宜里地区(49°51'N,124°16'E)	二长花岗岩	175.8±1.2	文献[4]
5	上其地区(49°00'-49°20'N,120°00'-122°30'E)	中细粒二长花岗岩	191.0±1.0	文献[6]
6	上其地区(49°00'-49°20'N,120°00'-122°30'E)	中细粒正长花岗岩	176.1±0.87	文献[6]
7	上其地区(49°00'-49°20'N,120°00'-122°30'E)	中细粒二长花岗岩	188.0±1.2	文献[6]
8	上其地区(49°00'-49°20'N,120°00'-122°30'E)	黑云母二长花岗岩	182.1±0.93	文献[6]
9	上其地区(49°00'-49°20'N,120°00'-122°30'E)	中细粒二长花岗岩	194.7±1.0	文献[6]
10	乌奴格吐山铜矿(49°24'21″N,117°19'11″E)	黑云母花岗岩	197.9±2.7	文献[8]
11	新天镇北岩体(51°13'53″N,124°23'23″E)	片麻状花岗岩	187.7±2.5	文献[8]
12	大金山(50°20'-50°40'N,124°30'-125°00'E)	花岗闪长岩	183.2±1.0	文献[14]
13	鸡尾甸子岩体(51°49'14″N,126°16'21″E)	中粒斑状黑云母二长花岗岩	176±1.0	文献[15]
14	兴华—翻身屯岩体(52°00'23″N,126°12'46″E)	中细粒黑云母二长花岗岩	178±1.0	文献[15]
15	鸡尾甸子岩体(51°52'45″N,125°47'40″E)	中粗粒二长花岗岩	181±1.0	文献[15]
16	韩家园子岩体(52°02'43″N,125°38'40″E)	花岗岩质岩	188±1.0	文献[15]
17	正棋村岩体(52°31'50″N,126°08'24″E)	中粒花岗闪长岩	190±1.0	文献[15]
18	扎林库尔山(52°30'-52°40'N,123°30'-123°45'E)	黑云母二长花岗岩	177.68±0.98	文献[22]
19	黑龙江地营子(51°-52°N,126°-127°E)	二长花岗岩	180.6±1.1	文献[38]
20	塔木兰沟岩体(51°23'27″N,121°31'52″E)	花岗质岩石	193±5.0	文献[40]
21	金河镇(51°25'56″N,121°31'52″E)	花岗质岩石	186±3.0	文献[40]
22	朝阳林场岩体(49°01'58″N,126°22'23″E)	二长花岗岩	187±6.0	文献[41]
23	卧都河南部(50°10'-50°40'N,123°15'-126°45'E)	正长花岗岩	181±1.0	文献[42]
24	乌奴格吐山钼矿(48°-52°N,114°-124°E)	黑云母花岗岩	178.2±9.2	文献[43]