西藏青草山斑岩铜金矿床含矿斑岩锆石U-Pb年代学及岩石成因

郑海涛; 郑有业; 徐净; 吴松; 郭建慈; 高顺宝; 次琼

doi:10.3799/dqkx.2018.111

西藏青草山斑岩铜金矿床含矿斑岩锆石U-Pb年代学及岩石成因

doi: 10.3799/dqkx.2018.111

郑海涛^1,2,,
郑有业^1, ,,
徐净¹,
吴松³,
郭建慈⁴,
高顺宝²,
次琼⁴

1.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074
2.
中国地质大学地质调查研究院, 湖北武汉 430074
3.
中国地质大学地球科学与资源学院, 北京 100083
4.
西藏自治区地质矿产勘查开发局, 西藏拉萨 850000

基金项目:

中央高校基本科研业务费专项资金 CUGL170413

国家自然科学基金项目 41302065

中国地质调查局项目 12120114000701

中国地质调查局项目 12120114081401

详细信息

作者简介:
郑海涛(1982-), 男, 博士研究生, 主要从事成矿规律研究专业

通讯作者:
郑有业

中图分类号: P597
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- PDF下载量: 25
- 被引次数: 0
出版历程
- 收稿日期: 2018-05-24
- 刊出日期: 2018-08-15

Zircon U-Pb Ages and Petrogenesis of Ore-Bearing Porphyry for Qingcaoshan Porphyry Cu-Au Deposit, Tibet

Zheng Haitao^{1,2
,},
Zheng Youye^{1
, ,},
Xu Jing¹,
Wu Song³,
Guo Jianci⁴,
Gao Shunbao²,
Ci Qiong⁴

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Geological Survey Institute, China University of Geosciences, Wuhan 430074, China
3.
School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China
4.
Tibet Autonomous Region Geological and Mineral Exploration and Development Bureau, Lhasa 850000, China

摘要

摘要: 西藏青草山Cu-Au矿床是班公湖-怒江缝合带北侧新发现的具有大型远景的斑岩型矿床，但该矿床含矿斑岩的年龄、成因及源区一直未得到有效的约束.对青草山花岗闪长岩以及含矿花岗岩闪长斑岩进行了锆石年代学、Hf同位素以及岩石地球化学研究.结果显示，花岗闪长岩与含矿花岗闪长斑岩的侵入时代分别为131.2±0.3 Ma与117.9±0.8 Ma，代表了班公湖-怒江缝合带早期的成岩作用以及斑岩Cu-Au成矿作用.二者具有相似的地球化学特征，表明二者可能具有相同的岩浆源区，是不同时期同源岩浆活动的产物.结合含矿花岗闪长斑岩锆石Hf同位素组成，认为青草山含矿斑岩形成于班公湖-怒江洋壳向北俯冲过程中，是下地壳部分熔融的产物，受到了少量地幔物质的混合.
- 岩石成因 /
- 锆石U-Pb年龄 /
- 斑岩铜金矿床 /
- 青草山 /
- 班公湖-怒江成矿带 /
- 西藏 /
- 地球化学 /
- 地质年代学
Abstract: The Qingcaoshan porphyry Cu-Au deposit, located in the northern Bangong Co-Nujiang belt, is a newly discovered porphyry deposit with huge potential.However, the age, origin and source area of the ore-bearing porphyry have not been effectively constrained.In this paper, we present the zircon geochronology, Hf isotope, and geochemistry of Qingcaoshan granodiorite and granodiorite porphyry.The analysis results show that the ages of granodiorite porphyry and granodiorite are 117.9±0.8 Ma and 131.2±0.3 Ma, respectively, which represent porphyry mineralization of Bangong Co-Nujiang metallogenic belt.They also exhibit relatively uniform in-situ zircon Hf isotopic compositions.In conclusion, Qingcaoshan ore-bearing porphyries were derived from the partial melting of mafic lower crust, which were induced by the subduction of the Bangong Co-Nujiang ocean crust, and they were also mixed by a small amount of enriched lithospheric mantle.
- petrogenesis /
- zircon U-Pb age /
- porphyry Cu-Au deposit /
- Qingcaoshan /
- Bangong Co-Nujiang metallogenic belt /
- Tibet /
- geochemistry /
- geochronology

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图 1 青藏高原大地构造分区(a)和青草山斑岩Cu-Au矿床地质简图(b)

图b据西藏地勘局第二地质大队，2011.2011改则青草山矿区铜矿普查设计报告

Fig. 1. Tectonic framework of the Tibetan Plateau (a) and simplified geological map (b) of the Qingcaoshan porphyry Cu-Au deposit

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图 2 青草山花岗闪长斑岩(QCS-B3)和花岗闪长岩(QCS-B9)锆石阴极发光图

(QCS-B9)实线圆圈为U-Pb年龄测点，圆圈边数值表示年龄；虚线圆圈为Hf同位素测点，圆圈边数值表示锆石Hf同位素组成

Fig. 2. The cathodoluminescence (CL) images of zircons for the Qingcaoshan granodiorite porphyry (QCS-B3) and granodiorite

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图 3 青草山花岗闪长斑岩(QCS-B3)和花岗闪长岩(QCS-B9)锆石U-Pb年龄谐和图

Fig. 3. Zircon U-Pb concordia diagrams of the Qingcaoshan granodiorite porphyry (QCS-B3) and granodiorite (QCS-B9)

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图 4 青草山花岗闪长斑岩和花岗闪长岩主量元素图解

图a据Wilson(1989)；图b据Peccerillo and Taylor(1976).多不杂与波龙矿床的花岗闪长斑岩数据分别来源于佘宏全等(2009)及陈华安等(2013)

Fig. 4. Discrimination diagrams for the Qingcaoshan granodiorite porphyry and granodiorite

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图 5 青草山花岗闪长斑岩和花岗闪长岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)

标准化数值据Sun and McDonough(1989).多不杂与波龙矿床的花岗闪长斑岩数据分别来源于佘宏全等(2009)及陈华安等(2013)

Fig. 5. Chondrite-normalized rare earth element pattern (a) and primitive mantle-normalized trace element spider diagram (b) for the Qingcaoshan granodiorite porphyry and granodiorite

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图 6 青草山花岗闪长斑岩和花岗闪长岩的构造判别图解

图b据Pearce et al.(1984).多不杂与波龙矿床的花岗闪长斑岩数据分别来源于佘宏全等(2009)及陈华安等(2013)；VAG.火山岛弧花岗岩；WPG.板内花岗岩；Syn-COLG.同碰撞花岗岩；ORG.洋脊花岗岩

Fig. 6. Discrimination diagrams for the Qingcaoshan granodiorite porphyry and granodiorite

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图 7 草山花岗闪长斑岩和花岗闪长岩的La/Sm-La图解

多不杂与波龙矿床的花岗闪长斑岩数据分别来源于佘宏全等(2009)及陈华安等(2013)

Fig. 7. La/Sm-La diagram for the Qingcaoshan granodiorite porphyry and granodiorite

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图 8 青草山花岗闪长斑岩锆石ε_Hf(t)-t图解

波龙花岗闪长斑岩与多龙矿集区成矿斑岩数据分别来源于陈华安等(2013)

Fig. 8. ε_Hf(t)-t diagram for the Qingcaoshan granodiorite porphyry

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表 1 青草山花岗闪长斑岩与花岗闪长岩LA-ICPMS锆石U-Pb分析结果

Table 1. LA-ICPMS zircon U-Pb dating data of the Qingcaoshan granodiorite porphyry and granodiorite

测点号	含量(10^-6)		Th/U	同位素比值						年龄(Ma)
测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
花岗闪长斑岩
QCS-B3-1	92	639	0.14	0.050 0	0.001 7	0.130 6	0.004 3	0.018 9	0.000 2	118	3.65	118	1.02
QCS-B3-2	76	600	0.13	0.045 2	0.001 5	0.115 6	0.003 7	0.018 6	0.000 2	112	3.48	117	1.05
QCS-B3-3	78	581	0.13	0.049 4	0.001 6	0.128 5	0.004 2	0.018 9	0.000 2	120	3.68	119	1.06
QCS-B3-4	131	670	0.20	0.047 1	0.001 6	0.133 2	0.004 7	0.020 5	0.000 2	123	3.37	128	1.15
QCS-B3-5	188	786	0.24	0.048 7	0.001 3	0.135 9	0.003 5	0.020 2	0.000 2	128	3.23	128	1.12
QCS-B3-6	121	686	0.18	0.047 0	0.001 5	0.126 4	0.004 0	0.019 5	0.000 2	120	3.85	122	1.21
QCS-B3-7	187	785	0.24	0.046 7	0.001 4	0.133 8	0.003 9	0.020 8	0.000 2	128	3.42	132	1.07
QCS-B3-8	136	732	0.19	0.045 6	0.001 3	0.129 6	0.003 8	0.020 6	0.000 2	126	3.43	132	0.94
QCS-B3-10	131	536	0.24	0.048 0	0.001 9	0.122 0	0.004 5	0.018 6	0.000 2	119	4.13	118	1.19
QCS-B3-11	309	1 017	0.30	0.048 5	0.001 3	0.134 8	0.003 6	0.020 1	0.000 2	125	3.15	128	0.97
QCS-B3-12	139	671	0.21	0.048 2	0.001 6	0.130 3	0.004 4	0.019 5	0.000 2	122	3.97	123	1.07
QCS-B3-13	234	878	0.27	0.047 8	0.001 2	0.136 8	0.003 5	0.020 7	0.000 2	130	3.10	132	1.10
QCS-B3-14	78	588	0.13	0.047 8	0.001 6	0.126 3	0.004 2	0.019 3	0.000 2	117	3.58	118	1.12
QCS-B3-15	102	653	0.16	0.049 1	0.001 7	0.125 9	0.004 1	0.018 6	0.000 2	118	3.69	118	1.21
QCS-B3-16	101	675	0.15	0.051 5	0.001 7	0.138 6	0.004 7	0.019 6	0.000 2	122	4.32	122	1.24
QCS-B3-17	174	797	0.22	0.048 0	0.001 4	0.138 5	0.003 9	0.020 9	0.000 2	130	3.73	132	1.14
QCS-B3-18	109	407	0.27	0.050 3	0.002 2	0.124 7	0.005 1	0.018 1	0.000 2	118	4.63	117	1.32
QCS-B3-19	108	449	0.24	0.045 9	0.001 8	0.115 7	0.004 6	0.018 3	0.000 2	114	4.14	117	1.10
QCS-B3-20	118	650	0.18	0.046 5	0.001 6	0.124 0	0.004 3	0.019 4	0.000 2	120	4.06	121	1.10
花岗闪长岩
QCS-B9-1	206	784	0.26	0.047 2	0.001 3	0.135 2	0.003 6	0.020 8	0.000 2	128	3.3	131	1.0
QCS-B9-2	258	1 113	0.23	0.049 9	0.001 6	0.141 6	0.004 4	0.020 9	0.000 4	127	3.1	130	1.0
QCS-B9-3	309	1 033	0.30	0.050 6	0.001 5	0.147 8	0.004 8	0.021 1	0.000 2	133	4.0	131	1.5
QCS-B9-4	263	970	0.27	0.050 0	0.001 4	0.143 6	0.004 0	0.020 8	0.000 2	131	3.6	130	1.4
QCS-B9-7	281	1 146	0.25	0.048 6	0.001 3	0.141 3	0.004 0	0.021 0	0.000 2	131	3.5	131	1.5
QCS-B9-9	307	1 084	0.28	0.046 9	0.001 2	0.131 1	0.003 2	0.020 2	0.000 2	125	3.0	131	1.1
QCS-B9-10	113	774	0.15	0.052 4	0.001 7	0.149 3	0.004 7	0.020 7	0.000 2	138	4.0	130	1.2
QCS-B9-14	235	1 022	0.23	0.049 7	0.001 3	0.147 9	0.003 9	0.021 4	0.000 2	136	3.4	133	1.2
QCS-B9-15	310	771	0.40	0.048 2	0.001 6	0.142 4	0.004 7	0.021 4	0.000 2	132	4.1	134	1.3
QCS-B9-16	206	789	0.26	0.047 0	0.001 4	0.139 6	0.004 1	0.021 5	0.000 2	132	3.7	134	1.4
QCS-B9-17	130	647	0.20	0.053 1	0.001 5	0.159 8	0.004 9	0.021 6	0.000 3	139	4.8	132	1.8
QCS-B9-18	472	1 098	0.43	0.049 7	0.001 3	0.139 1	0.003 5	0.020 3	0.000 2	131	3.3	130	0.9
QCS-B9-19	239	817	0.29	0.049 1	0.001 3	0.141 6	0.003 8	0.020 8	0.000 2	133	3.4	131	1.1

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表 2 青草山花岗闪长斑岩锆石原位Hf同位素数据

Table 2. In-situ zircon Hf isotope data of the Qingcaoshan granodiorite porphyry

测点号	t (Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	±σ	ε_Hf(t)	±1σ	t_DM2(Hf)	f_Lu/Hf
QCS-B3-3	120.8	0.021 689	0.000 797	0.282 707	0.000 379	0.27	0.57	1 029	-0.98
QCS-B3-1	121.0	0.019 219	0.000 697	0.282 712	0.000 340	0.48	0.57	1 018	-0.98
QCS-B3-18	117.0	0.018 597	0.000 679	0.282 719	0.000 174	1.10	0.61	997	-0.98
QCS-B3-4	130.5	0.020 163	0.000 737	0.282 694	0.000 232	0.02	0.61	1 051	-0.98
QCS-B3-5	129.0	0.021 672	0.000 798	0.282 702	0.000 122	0.30	0.62	1 034	-0.98
QCS-B3-7	132.7	0.024 334	0.000 899	0.282 712	0.000 209	0.72	0.58	1 014	-0.97
QCS-B3-8	131.2	0.019 496	0.000 706	0.282 675	0.000 425	-0.61	0.58	1 087	-0.98
QCS-B3-10	119.1	0.033 375	0.001 241	0.282 725	0.000 176	0.85	0.60	996	-0.96
QCS-B3-11	128.3	0.024 251	0.000 899	0.282 681	0.000 235	-0.47	0.58	1 077	-0.97
QCS-B3-12	124.6	0.019 970	0.000 730	0.282 689	0.000 357	-0.27	0.62	1 063	-0.98
QCS-B3-13	132.0	0.022 365	0.000 816	0.282 711	0.000 191	0.65	0.61	1 017	-0.98
QCS-B3-16	124.9	0.031 567	0.001 255	0.282 703	0.000 614	0.19	0.75	1 037	-0.96
QCS-B3-14	123.1	0.017 094	0.000 644	0.282 693	0.000 161	-0.14	0.59	1 054	-0.98
QCS-B3-15	119.1	0.017 330	0.000 643	0.282 690	0.000 069	-0.35	0.58	1 063	-0.98
QCS-B3-17	133.6	0.020 659	0.000 744	0.282 701	0.000 108	0.37	0.57	1 034	-0.98
注:ε_Hf(t) = 10 000×{[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt-1)]/[(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR×(e^λt-1)]-1}；t_DM =1/λ×ln{1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[(¹⁷⁶Lu/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]}；t_DM^C=t_DM-(t_DM-t)×[(f_cc-f_Lu/Hf)/(f_cc-f_DM)]；f_Lu/Hf =(¹⁷⁶Lu/¹⁷⁷Hf)_S/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1；λ=1.867×10^-11a^-1 (Söderlund et al., 2004); (¹⁷⁶Lu/¹⁷⁷Hf)_S和(¹⁷⁶Hf/¹⁷⁷Hf)_S是样品的测量值；(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR =0.033 2，(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0} =0.282 772；(¹⁷⁶Lu/¹⁷⁷Hf)_DM = 0.038 4，(¹⁷⁶Hf/¹⁷⁷Hf)_DM = 0.283 25(Griffin et al., 2000); (¹⁷⁶Lu/¹⁷⁷Hf)_地壳=0.015；f_cc= [(¹⁷⁶Lu/¹⁷⁷Hf)_地壳/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR]-1；f_DM =[(¹⁷⁶Lu/¹⁷⁷Hf)_DM/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR]-1.

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表 3 青草山岩体主量(%)、微量(10^-6)及稀土元素(10^-6)分析结果

Table 3. Major elements (%), trace elements (10^-6) and rare earth elements (10^-6) compositions of intrusions from Qingcaoshan porphyry Cu-Au deposit

样品	花岗闪长斑岩										花岗闪长岩
样品	QCS-B3	QCS-B4	QCS-B5	QCS-B6	QCS2015-1	QCS2015-2	QCS2015-3	QCS2015-4	QCS2015-5		QCS-B9	QCS-B10
SiO₂	66.30	67.51	67.77	67.14	67.23	66.90	67.13	67.45	66.87		69.17	67.97
TiO₂	0.44	0.40	0.42	0.42	0.41	0.45	0.42	0.41	0.45		0.35	0.43
Al₂O₃	15.59	14.68	15.11	15.50	15.94	15.33	15.44	15.39	15.20		14.76	15.43
Fe₂O₃	1.35	1.42	1.62	1.38	1.46	1.45	1.57	1.51	1.67		0.93	1.82
FeO	1.65	1.30	1.40	1.13	1.29	1.34	1.62	1.46	1.51		1.37	0.73
MnO	0.02	0.02	0.02	0.01	0.01	0.02	0.02	0.02	0.01		0.03	0.02
MgO	1.64	1.41	1.24	1.44	1.54	1.45	1.42	1.41	1.56		1.10	0.75
CaO	1.62	1.31	1.82	1.42	1.66	1.75	1.64	1.57	1.50		2.21	1.34
Na₂O	2.05	1.48	2.13	2.19	2.11	2.03	2.09	2.23	2.12		2.17	1.55
K₂O	6.95	7.60	5.87	6.91	6.99	6.78	7.01	6.95	6.28		6.24	7.26
P₂O₅	0.20	0.18	0.17	0.19	0.19	0.21	0.18	0.19	0.18		0.13	0.17
H₂O⁺	1.60	1.52	1.52	1.48	1.57	1.49	1.56	1.54	1.45		1.10	1.51
CO₂	0.22	0.75	0.60	0.40	0.56	0.66	0.34	0.37	0.49		0.18	0.70
Total	99.63	99.58	99.69	99.61	100.96	99.86	100.44	100.5	99.29		99.74	99.68
Mg^#	50.49	49.35	43.60	51.96	51.46	49.56	45.62	47.27	48.13		47.03	36.07
Na₂O+K₂O	9.00	9.08	8.00	9.10	9.10	8.81	9.10	9.18	8.40		8.41	8.81
Na₂O/K₂O	3.39	5.14	2.76	3.16	3.31	3.34	3.35	3.12	2.96		2.88	4.68
La	24.7	29.2	27.0	27.2	26.8	25.1	26.4	28.9	27.4		24.7	27.9
Ce	46.4	53.7	49.0	48.7	47.1	41.8	49.1	52.9	52.0		44.5	66.9
Pr	5.51	5.99	5.64	5.65	5.56	5.67	5.55	5.70	5.62		5.03	5.73
Nd	20.1	21.5	20.4	20.5	20.0	19.5	20.3	22.6	20.9		17.9	21.0
Sm	3.82	3.86	3.72	3.77	3.79	3.72	3.90	3.88	3.73		3.17	3.97
Eu	0.891	0.861	0.898	0.867	0.905	0.829	0.866	0.912	0.883		0.884	1.00
Gd	3.50	3.32	3.36	3.40	3.45	3.29	3.50	3.43	3.48		2.81	3.52
Tb	0.499	0.486	0.473	0.496	0.488	0.491	0.479	0.477	0.502		0.416	0.509
Dy	2.86	2.63	2.67	2.66	2.96	2.61	2.78	2.73	2.59		2.26	2.84
Ho	0.539	0.491	0.509	0.513	0.499	0.521	0.517	0.488	0.500		0.433	0.523
Er	1.57	1.65	1.45	1.47	1.71	1.49	1.62	1.58	1.54		1.36	1.66
Tm	0.255	0.222	0.225	0.228	0.234	0.229	0.231	0.246	0.243		0.196	0.243
Yb	1.70	1.55	1.48	1.54	1.67	1.51	1.49	1.60	1.76		1.37	1.66
Lu	0.248	0.223	0.230	0.227	0.229	0.236	0.241	0.219	0.250		0.200	0.237
Y	16.1	24.8	14.4	15.4	13.9	11.8	15.8	16.0	16.7		13.9	22.5
Li	37.0	36.4	31.7	36.9	34.6	35.8	0.8	33.5	38.1		21.8	15.8
Be	1.70	1.42	1.92	1.62	1.55	1.67	1.78	1.85	1.59		1.87	1.69
Sc	7.53	6.43	6.99	6.80	6.45	6.09	7.13	6.84	6.76		4.98	6.15
Cr	8.78	10.10	12.00	7.24	8.98	7.77	10.34	9.79	10.50		11.00	9.57
Co	7.71	10.10	8.30	7.18	7.89	8.97	9.02	9.45	8.34		4.77	7.63
Cu	1 767	2 931	1 287	1 921	1 367	1 786	1 573	1 005	2 450		541	1 257
Zn	72.4	134	46.2	65.2	56.7	99.0	76.5	121.0	90.2		60.9	57.6
Ga	18.0	18.4	17.1	17.9	17.8	19.0	18.2	16.8	16.4		17.4	19.0
Ge	1.30	1.35	1.33	1.21	1.18	1.40	1.37	1.26	1.24		1.25	1.11
Rb	232	230	197	201	221	218	208	233	213		176	218
Cs	9.51	9.69	10.70	9.23	9.76	9.45	9.99	10.43	9.82		9.44	10.90
Pb	49.4	551	12.5	14.1	78.0	47.0	17.0	32.0	23.0		26.2	14.4
Th	10.1	8.6	12.0	12.3	12.4	11.8	10.5	9.5	11.2		11.8	13.4
U	2.45	1.98	2.19	2.64	2.40	2.23	2.38	2.55	1.89		2.78	2.50
Ni	9.8	13.5	10.0	13.2	9.0	14.1	11.3	13.7	12.5		8.9	13.9
Sr	243	186	240	225	194	209	231	199	216		275	189
V	75.0	63.5	68.0	63.3	67.1	69.3	71.2	64.8	73.0		43.2	47.0
Zr	115	151	109	4 383	157	148	134	166	123		179	164
Nb	10.4	12.7	12.6	12.6	11.4	10.6	12.4	11.5	13.4		11.1	13.4
Ba	460	398	371	433	89	403	386	428	415		436	491
Hf	3.40	4.38	3.37	87.40	4.50	3.76	3.48	3.97	3.84		4.92	4.62
Ta	0.67	1.09	0.95	1.59	1.13	0.89	1.05	0.76	0.98		1.89	1.29
As	3.89	7.93	1.55	3.90	3.76	3.09	4.03	3.82	3.97		4.49	6.76
Hg	0.031	0.019	0.020	0.018	0.017	0.023	0.030	0.025	0.016		0.014	0.017
Bi	24.3	58.1	6.43	24.2	54.3	45.7	37.8	32.4	5.9		3.92	14.7
Sb	0.50	0.65	0.27	0.29	0.76	0.43	0.54	0.38	0.62		0.28	2.07
Mo	16.9	294	6.21	5.77	20.1	7.97	8.04	6.83	4.73		13.3	6.67
W	10.4	73.6	3.6	10.1	15.1	13.5	16.8	9.8	9.4		14.1	9.1
Sn	9.07	9.57	7.24	9.58	9.87	9.03	8.78	8.02	9.45		7.38	7.52
Ag	1.78	4.09	1.09	2.18	2.09	2.34	1.89	1.73	1.99		0.761	1.45
Au	166	137	76.8	218	156	139	189	167	187		11.4	67.7
∑REE	112	125	117	117	129	119	133	142	138		105	137
LREE/HREE	9.1	10.9	10.2	10.1	9.3	9.3	9.8	10.7	10.2	10.6	11.3
Sr/Y	15.1	7.5	16.7	14.6	14.0	17.7	14.6	12.4	12.9	19.7	8.4
La/Yb	14.6	18.8	18.2	17.7	16.0	16.6	17.7	18.1	15.6	18.0	16.9
(La/Yb)_N	10.5	13.5	13.1	12.7	11.5	11.9	12.7	13.0	11.2	12.9	12.1
Dy/Yb	1.70	1.70	1.80	1.70	1.69	1.69	1.80	1.73	1.77	1.65	1.71
δEu	0.73	0.72	0.76	0.73	0.75	0.71	0.70	0.75	0.74	0.89	0.80
注:Mg^#=100×Mg/(Mg+ Fe)(原子个数比)；TFeO=FeO+0.89×Fe₂O₃；A/CNK=摩尔Al₂O₃/(CaO+Na₂O+K₂O)；δEu=2×Eu_N/(Sm_N+Gd_N).

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表 4 班公湖-怒江成矿带主要矿床的年代学特征

Table 4. Ages of deposits in Bangong Co-Nujiang metallogenic belt

矿区	岩性	测试对象	方法	年龄(Ma)	资料来源
尕尔穷	石英闪长岩	锆石	LA-ICPMS U-Pb	87.1±0.4	姚晓峰等(2012)
	花岗斑岩	锆石	LA-ICPMS U-Pb	83.2±0.7	姚晓峰等(2013)
	石英闪长岩	辉钼矿	Re-Os等时线	86.87±0.5	李志军等(2011)
嘎拉勒	花岗闪长岩	锆石	LA-ICPMS U-Pb	86.52±0.41
	闪长玢岩			88.59±0.45	吕立娜等(2011)
	闪长玢岩			88.09±0.41
	矽卡岩	白云母	⁴⁰Ar-³⁹Ar	91.48±0.68	汪傲等(2014)
多不杂	花岗闪长斑岩	锆石	SHRIMP U-Pb	120.9±2.4	佘宏全等(2009)
				121.6±1.9	李金祥等(2008)
				116.7±1.7	Li et al.(2011)
		辉钼矿	Re-Os等时线	118.0±1.5	佘宏全等(2009)
		绢云母	⁴⁰Ar-³⁹Ar	115.2±1.2	Li et al.(2011)
		钾长石	⁴⁰Ar-³⁹Ar	115.2±1.1	Li et al.(2011)
波龙	花岗闪长斑岩	锆石	LA-ICPMS U-Pb	120.2±2.0
				119.5±0.9	陈华安等(2013)
				119.3±1.3
			SHRIMP U-Pb	121.1±1.7	Li et al.(2011)
			SIMS U-Pb	117.5±1.0
				118.0±1.0
				118.5±1.0	Li et al.(2014)
	石英闪长玢岩			118.4±1.1
	石英闪长玢岩			118.6±1.0
	花岗闪长斑岩	辉钼矿	Re-Os等时线	119.4±1.5	祝向平等(2011)
拿若	花岗闪长斑岩	锆石	SHRIMP U-Pb	119.5±0.6	吕立娜(2012)
铁格龙	英云闪长斑岩	锆石	SHRIMP U-Pb	119.7±0.6	吕立娜(2012)
尕尔勤	英云闪长斑岩	锆石	SHRIMP U-Pb	122.5±0.6	吕立娜(2012)
青草山	花岗闪长斑岩	锆石	LA-ICPMS U-Pb	114.6±1.2	周胜金等(2013)
	花岗闪长斑岩			117.9±0.8	本文
	花岗闪长岩			131.2±0.3	本文

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