小兴安岭东安金矿区细粒正长花岗岩U-Pb年龄、岩石地球化学、Hf同位素组成及地质意义

李碧乐; 孙永刚; 陈广俊; 郗爱华; 支宇博; 常景娟; 彭勃

doi:10.3799/dqkx.2016.001

小兴安岭东安金矿区细粒正长花岗岩U-Pb年龄、岩石地球化学、Hf同位素组成及地质意义

doi: 10.3799/dqkx.2016.001

1.
吉林大学地球科学学院，吉林长春 130061
2.
西南石油大学地球科学与技术学院，四川成都 610000

基金项目:

中国地质调查局地质大调查项目 12120111086020

吉林省科技发展计划重点项目 20100445

国家自然科学基金项目 41272093

国家自然科学基金项目 41272095

详细信息

作者简介:
李碧乐(1965-)，男，教授，主要从事热液矿床成矿理论与预测、区域成矿作用研究.E-mail：libl@jlu.edu.cn

中图分类号: P581
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出版历程
- 收稿日期: 2015-11-01
- 刊出日期: 2016-01-15

Zircon U-Pb Geochronology, Geochemistry and Hf Isotopic Composition and Its Geological Implication of the Fine-Grained Syenogranite in Dong'an Goldfield from the Lesser Xing'an Mountains

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610000, China

摘要

摘要: 东安金矿区细粒正长花岗岩是小兴安岭燕山早期与吉黑东部斑岩型-矽卡岩型钼多金属矿床有关的花岗岩带组成岩体之一.为了解区域燕山早期岩浆演化和大规模钼多金属热液的成矿作用，进一步提升东安金矿成矿地质背景的研究程度，对该花岗岩进行了岩石地球化学、锆石U-Pb年龄和Hf同位素研究，讨论了岩石成因、岩浆源区和构造背景.获得细粒正长花岗岩锆石LA-ICP-MS U-Pb定年结果184±2 Ma，MSWD=1.2，为早侏罗世.岩石富硅和钾(K₂O/Na₂O值为1.46~1.81)，低钙、镁和Mg^#(Mg^#=12.79~23.52)，A/CNK=1.05~1.14，属高钾钙碱性、弱过铝质系列岩石.岩石富集大离子亲石元素(Rb、K)和不相容元素(Th、U)，亏损高场强不相容元素(Nb、Ti等)，轻、重稀土元素分馏强烈，轻微负Eu异常(Eu/Eu^*=0.76~0.92).综合岩石地球化学特征、Harker图解、Ce-SiO₂和(K₂O+Na₂O)/CaO-(Zr+Nb+Ce+Y)判别图解确定岩石为高分异I型花岗岩.锆石的¹⁷⁶Hf /¹⁷⁷Hf值为0.282 588~0.282 775，ε_Hf(t)值为-2.35~+3.94，二阶段模式年龄T_DM2为973~1 386 Ma，岩浆源区应主要为起源于亏损地幔的中新元古代新增生陆壳的部分熔融，有硅铝质地壳物质的加入.研究表明，岩石形成于古太平洋板块俯冲引起大陆弧后伸展和岩石圈减薄的构造背景，幔源岩浆底侵为地壳熔融提供了热动力.燕山早期伸展体制下大陆岩浆弧环境的中-浅成、高钾钙碱性花岗质小侵入体是吉黑东部斑岩型-矽卡岩型钼多金属矿床找矿的主要目标.
- 小兴安岭 /
- 东安金矿 /
- 细粒正长花岗岩 /
- 岩石地球化学 /
- 锆石U-Pb年龄 /
- Hf同位素
Abstract: The fine-grained syenogranite in the Dong'an goldfield is the early Yanshanian granite body in the Lesser Xing'an Mountains, it is one of the granite bodys of the granite belt which is related to porphyry and skarn-type molybdenum-polymetallic deposits in the east Jilin-Heilongjiang Province. In order to understand regional magmatic evolution in the early Yanshanian and cosmical molybdenum-polymetallic hydrothermal mineralization, thus further promote the research degree of the metallogenic background in the Dong'an goldfield. This paper presents geochemisty, zircon U-Pb geochronology, and Hf-isotopic data of these rocks, their petrogenesis, sources and tectonic implications have been investigated. The granitic rocks yield an average zircon LA-ICP-MS U-Pb age of 184±2 Ma (MSWD=1.2), i.e., the Early Jurassic. The granites have high SiO₂ (75.39%-78.84%) and K₂O (K₂O/Na₂O: 1.46~1.81), low CaO, MgO and Mg^# (12.79-23.52), with A/CNK values of 1.05-1.14, indicating high potassium calc-alkaline, weakly peraluminous granites. The granites are enriched in large ion lithosphile elements (Rb, K) and incompatibale elements (Th, U), and depleted in high field-strength element (Nb, Ti). They have strong fractionation between LREE and HREE, as well as slightly negative Eu anomalies (Eu/Eu^*=0.76-0.92). It was shown that these granitic rocks belong to highly fractionated I-type granites according to lithogeochemical constituents, Harker plots, the discrimination diagrams of Ce vs. SiO₂ and (K₂O+Na₂O)/CaO vs. Zr+Nb+Ce+Y. All zircons in the granites have ¹⁷⁶Hf/¹⁷⁷Hf ratios ranging from 0.282 588 to 0.282 775, ε_Hf(t) values ranging from -2.35 to +3.94, and two-stage Hf model ages (T_DM2) ranging from 973 to 1 386 Ma. It was indicated that the magma was originated from the partial melting of Meso-Neoproterozoic juvenile accreted lower crust that was derived from the depleted mantle, with addition of ancient sialic crustal materials. The results show that the granites were generated from the extensional and lithospheric thinning environment due to the subduction of the Paleo-Pacific plate, and underplating of the mantle-derived magma provided the thermodynamic power for the partial melting of the crust. The small scale hypabyssal-middle high potassium calc-alkaline granitic intrusive bodies that were generated in the continental arc extension setting in the early Yanshanian are main targets for the prospecting of porphyry and skarn-type molybdenum-polymetallic deposits in the east Jilin-Heilongjiang Province.
- Lesser Xing'an mountains /
- Dong'an goldfield /
- syenogranite /
- geochemistry /
- zircon U-Pb age /
- zircon Hf isotopes

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图 1 东安金矿区地质简图

a中① 喜桂图-塔源断裂；② 贺根山-黑河断裂；③ 索伦-西拉木伦-长春缝合带；④ 嘉荫-牡丹江断裂；⑤ 伊通-依兰断裂；⑥ 敦化-密山断裂；b中1.第四系；2.第四系大熊山组玄武岩；3.流纹质凝灰岩；4.流纹岩；5.英安岩；6.粗安岩；7.安山岩；8.流纹斑岩；9.细粒正长花岗岩；10.中粗粒碱长花岗岩；11.金矿体及编号；12.隐爆角砾岩；13.矿化蚀变带；14.断裂；15.采样位置；a图据Wu et al.(2007)修编；b图据黑龙江省有色金属地质勘查707队，2005.黑龙江省逊克县东安金矿5^#矿体勘探报告修编

Fig. 1. Sketch geological map of Dong'an goldfield

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图 2 东安金矿区细粒正长花岗岩手标本和显微照片

a.细粒正长花岗岩手标本；b.细粒正长花岗岩的主要组成矿物(正交偏光)；c.斜长石的聚片双晶和条纹长石的条纹结构(正交偏光)；d.条纹长石中作为客晶的钠长石绢云母化(正交偏光)；Bt.黑云母；Pl.斜长石；Pth.条纹长石；Q.石英；Ser.绢云母

Fig. 2. Hand specimens photograph and microphotograph of the fine-grained syenogranite in Dong'an goldfield

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图 4 东安金矿区细粒正长花岗岩CL图像

圆圈数字代表U-Pb分析点

Fig. 4. CL images of zircons from the fine-grained syenogranite in Dong'an goldfield

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图 3 东安金矿区细粒正长花岗岩锆石U-Pb年龄协和图(a)与加权平均年龄(b)

Fig. 3. Zircons U-Pb concordia diagram (a) and weighted avergae ages diagram (b) for the fine-grained syenogranite in Dong'an goldfield

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图 5 东安金矿区细粒正长花岗岩的TAS图

Fig. 5. TAS diagram for the fine-grained syenogranite in Dong'an goldfield

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图 6 东安金矿区细粒正长花岗岩的A/CNK-A/NK图解(a)和SiO₂-K₂O图解(b)

Fig. 6. Plots of A/CNK versus A/NK (a) and SiO₂ versus K₂O (b) for the fine-grained syenogranite in Dong'an goldfield

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图 7 东安金矿区细粒正长花岗岩的稀土元素球粒陨石标准化配分曲线图和原始地幔标准化蛛网图

球粒陨石标准化值据Boynton(1984)；原始地幔标准化值据Sun and Mcdonough(1989)

Fig. 7. Chondrite-normalized REE patterns and primitive mantle-normalized trace element spider diagrams of the fine-grained syenogranite in Dong'an goldfield

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图 8 东安金矿区细粒正长花岗岩Ce-SiO₂判别图解(a)和(K₂O+Na₂O)/CaO-(Zr+Nb+Ce+Y)判别图解(b)

A.A型花岗岩；FG.分异的I型花岗岩；OGT.I、S、M型花岗岩

Fig. 8. Ce-SiO₂ (a) and (K₂O+Na₂O)/CaO-(Zr+Nb+Ce+Y) (b) diagrams of the fine-grained syenogranite in Dong'an goldfield

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图 9 东安金矿区细粒正长花岗岩锆石Hf同位素特征

a图据Yang et al.(2006)

Fig. 9. Zircon Hf isotopic features for the fine-grained syenogranite in Dong'an goldfield

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图 10 东安金矿区细粒正长花岗岩的Th/Hf-Ta/Hf图解(a)和Rb-(Y+Nb)花岗岩判别图解(b)

图b据Pearce(1996)

Fig. 10. Tectonic distinction diagram of Th/Hf-Ta/Hf diagram (a) and Rb vs. (Y+Nb) for the fine-grained syenogranite in Dong'an goldfield

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图 11 东北地区早-中侏罗世斑岩型(含矽卡岩型)矿床分布

1.翠宏山；2.霍吉河；3.翠岭；4.鹿鸣；5.福安堡；6.季德屯；7.大黑山；8.兰家；据许文良等(2013)有修改

Fig. 11. Distribution map of the Early-Middle Jurassic porphyry-type (including skarn type) ore deposits in NE China

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表 1 东安金矿区细粒正长花岗岩锆石LA-ICP-MS U-Pb同位素定年数据

Table 1. LA-ICP-MS zircon U-Pb isotope dating results of the fine-grained syenogranite in Dong'an goldfield

样品	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁶Pb/²³⁸U
样品	Th/U	比值	1σ	比值	1σ	比值	1σ	t(Ma)	1σ
DA-N2-1	1.61	0.049 77	0.002 84	0.204 25	0.012 00	0.029 55	0.000 80	188	5
DA-N2-2	2.60	0.048 82	0.002 99	0.204 53	0.013 11	0.029 74	0.000 76	189	5
DA-N2-3	2.44	0.052 18	0.003 46	0.220 41	0.013 73	0.031 17	0.000 81	198	5
DA-N2-4	1.76	0.050 04	0.002 50	0.203 84	0.010 08	0.029 58	0.000 62	188	4
DA-N2-5	1.42	0.050 50	0.003 10	0.206 49	0.012 30	0.029 70	0.000 61	189	4
DA-N2-6	1.35	0.049 46	0.002 53	0.198 70	0.010 05	0.028 83	0.000 46	183	3
DA-N2-7	2.43	0.050 38	0.002 39	0.204 38	0.009 37	0.029 09	0.000 41	185	3
DA-N2-8	1.99	0.049 58	0.002 03	0.197 00	0.007 86	0.028 57	0.000 39	182	2
DA-N2-9	1.77	0.049 67	0.002 16	0.200 17	0.008 34	0.029 11	0.000 38	185	2
DA-N2-10	1.24	0.050 21	0.002 28	0.203 33	0.009 27	0.029 11	0.000 47	185	3
DA-N2-11	1.47	0.051 34	0.004 87	0.199 41	0.018 21	0.027 91	0.000 75	177	5
DA-N2-12	2.51	0.050 46	0.002 67	0.199 09	0.010 49	0.028 64	0.000 47	182	3
DA-N2-13	2.24	0.049 24	0.002 22	0.198 10	0.009 13	0.028 87	0.000 46	183	3
DA-N2-14	2.02	0.049 88	0.003 12	0.197 36	0.012 11	0.028 87	0.000 61	183	4

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表 2 东安金矿区细粒正长花岗岩样品主量元素、稀土元素和微量元素含量及有关参数

Table 2. Major, REE and trace element content and parameter of the fine-grained syenogranite in Dong'an goldfield

样品号	DA-1-B1	DA-1-B2	DA-1-B3	DA-1-B4	DA-1-B5	DA-1-B6	DA-1-B7
SiO₂	75.54	75.40	76.10	75.39	75.68	76.92	78.84
TiO₂	0.17	0.18	0.16	0.17	0.16	0.11	0.10
Al₂O₃	12.66	12.57	12.67	12.50	12.80	12.14	11.23
Fe₂O₃^T	1.76	1.79	1.47	1.73	1.54	1.29	0.99
MnO	0.13	0.13	0.07	0.17	0.08	0.09	0.06
MgO	0.21	0.22	0.18	0.19	0.18	0.10	0.15
CaO	0.43	0.44	0.46	0.39	0.48	0.37	0.30
Na₂O	3.26	3.37	3.36	3.28	3.34	3.38	2.59
K₂O	5.17	5.17	5.02	5.15	4.99	4.92	4.69
P₂O₅	0.04	0.04	0.04	0.04	0.05	0.02	0.02
LOI	0.52	0.41	0.49	0.62	0.56	0.46	0.71
Total	99.90	99.73	100.03	99.63	99.84	99.79	99.68
Mg^#	19.32	19.84	19.76	17.69	18.93	12.79	23.52
里特曼指数	2.18	2.25	2.12	2.19	2.12	2.03	1.48
A/NK	1.15	1.13	1.15	1.14	1.17	1.11	1.20
A/CNK	1.08	1.05	1.07	1.07	1.09	1.05	1.14
DI	94.05	94.24	94.48	94.39	94.16	95.60	95.42
La	22.4	18.5	22.1	28.5	22.7	21.9	26.4
Ce	37.1	29.3	35.1	47.6	37.7	35.2	47.0
Pr	3.54	2.75	3.04	4.35	3.51	3.11	3.77
Nd	10.4	8.0	8.3	12.5	10.3	8.3	10.4
Sm	1.76	1.30	1.27	1.88	1.69	1.14	1.52
Eu	0.455	0.384	0.362	0.429	0.439	0.296	0.369
Gd	1.62	1.27	1.20	1.57	1.55	1.12	1.46
Tb	0.185	0.131	0.114	0.168	0.163	0.107	0.154
Dy	1.38	1.09	1.04	1.29	1.27	1.00	1.30
Ho	0.35	0.28	0.28	0.32	0.31	0.27	0.33
Er	0.95	0.79	0.77	0.87	0.87	0.78	0.95
Tm	0.141	0.112	0.110	0.128	0.122	0.113	0.133
Yb	1.08	0.85	0.86	0.99	0.93	0.92	1.00
Lu	0.165	0.120	0.122	0.135	0.128	0.136	0.132
Eu/Eu^*	0.82	0.92	0.90	0.76	0.83	0.80	0.76
(La/Yb)_N	14.00	14.68	17.22	19.36	16.45	15.98	17.78
LREE	75.76	60.18	70.08	95.24	76.30	69.96	89.48
HREE	5.87	4.64	4.50	5.47	5.34	4.45	5.46
LREE/HREE	12.91	12.97	15.58	17.41	14.28	15.74	16.39
Sc	2.25	2.08	2.17	2.57	2.27	2.10	1.69
Ⅴ	14.4	12.6	15.7	15.7	12.7	5.7	7.0
Cr	15.7	3.1	10.1	4.1	5.5	13.9	4.3
Co	1.99	1.88	2.02	2.00	2.32	1.72	2.08
Ni	3.51	2.76	3.93	3.64	3.03	4.49	7.65
Rb	217	213	208	221	219	226	224
Sr	111.3	105.0	109.7	113.9	118.2	43.8	45.9
Y	20.5	15.3	14.0	19.1	19.3	15.2	20.3
Nb	13.8	13.7	14.4	12.4	13.3	13.5	13.6
Cs	4.60	4.21	4.28	4.77	4.35	4.10	4.02
Ba	255	230	241	271	243	129	199
Ta	1.61	1.50	1.44	1.72	1.43	1.30	1.16
Th	28.4	26.3	25.8	26.7	27.5	28.4	25.7
U	5.08	3.51	4.52	4.17	4.07	4.39	4.61
Zr	89.2	73.6	77.4	73.8	71.8	77.6	60.7
Hf	3.90	3.31	3.54	3.34	3.14	3.60	2.95
Nb/Ta	8.56	9.13	9.94	7.22	9.32	10.33	11.70
La/Nb	1.63	1.35	1.54	2.29	1.69	1.62	1.95
Th/Nb	2.06	1.92	1.80	2.15	2.06	2.11	1.89
Th/La	1.27	1.42	1.17	0.94	1.21	1.29	0.97
注：主量元素单位为10^-2；微量、稀土元素单位为10^-6；A/CNK代表Al₂O₃/(CaO+Na₂O+K₂O)摩尔比；A/NK代表Al₂O₃/(Na₂O+K₂O)摩尔比；里特曼指数为[(K₂O+Na₂O)×(K₂O+Na₂O)]/(SiO₂/43)；分异指数(DI)=Qz+Or+Ab+Ne+Lc+Kp；Mg^#=100×(MgO/40.31)/(MgO/40.31+Fe₂O₃^T×2/159.7).

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表 3 东安金矿区细粒正长花岗岩样品Lu-Hf同位素组成

Table 3. Zircon Lu-Hf isotopic compositions of the fine-grained syenogranite in Dong'an goldfield

样品	t(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	2σ	T_DM1(Hf)	T_DM2(Hf)	f_Lu/Hf
DA-N2-1	188	0.069 899	0.001 697	0.282 699	0.000 027	-2.57	1.35	0.969 209	798	1 143	-0.95
DA-N2-2	189	0.053 772	0.001 304	0.282 668	0.000 029	-3.66	0.32	1.041 927	833	1 209	-0.96
DA-N2-3	198	0.056 565	0.001 351	0.282 588	0.000 028	-6.52	-2.35	0.987 513	949	1 386	-0.96
DA-N2-4	188	0.076 916	0.001 792	0.282 634	0.000 026	-4.87	-0.96	0.916 402	893	1 290	-0.95
DA-N2-5	189	0.061 102	0.001 440	0.282 701	0.000 027	-2.51	1.47	0.945 839	790	1 136	-0.96
DA-N2-6	183	0.065 569	0.001 647	0.282 655	0.000 027	-4.13	-0.31	0.948 724	860	1 244	-0.95
DA-N2-7	185	0.091 261	0.002 308	0.282 695	0.000 024	-2.73	1.05	0.841 565	818	1 160	-0.93
DA-N2-8	182	0.057 451	0.001 505	0.282 775	0.000 027	0.12	3.94	0.960 646	685	973	-0.95
DA-N2-9	185	0.077 236	0.002 009	0.282 744	0.000 028	-0.98	2.84	0.974 718	739	1 046	-0.94
DA-N2-10	185	0.075 839	0.002 238	0.282 633	0.000 030	-4.90	-1.12	1.055 964	906	1 297	-0.93
DA-N2-11	177	0.046 079	0.001 285	0.282 717	0.000 023	-1.95	1.79	0.829 658	764	1 107	-0.96
DA-N2-12	182	0.070 831	0.002 010	0.282 737	0.000 022	-1.23	2.52	0.785 353	750	1 063	-0.94
DA-N2-13	183	0.063 357	0.001 753	0.282 745	0.000 017	-0.94	2.87	0.608 889	732	1 042	-0.95
DA-N2-14	183	0.056 918	0.001 685	0.282 678	0.000 025	-3.34	0.47	0.884 451	829	1 195	-0.95
注：Hf同位素分析过程中采用的标准值为球粒陨石(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.033 2，(¹⁷⁶Hf/¹⁷⁷Hf)_CHUR，0= 0.282 772(Blichert-Toft and Albarède，1997)；亏损地幔(¹⁷⁶Lu/¹⁷⁷Hf)_DM=0.038 4，(¹⁷⁶Hf/¹⁷⁷Hf)_DM=0.283 250(Griffin et al., 2002)；Lu衰变常数(Lu=1.86×10^-1a^-1(吴福元等，2007b)).

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