西藏次玛班硕地区由秋米斑岩体锆石U-Pb年龄、地球化学特征

赵亚云; 刘晓峰; 刘远超; 次琼; 肖兰斌; 李莉; 张小强

doi:10.3799/dqkx.2018.118

西藏次玛班硕地区由秋米斑岩体锆石U-Pb年龄、地球化学特征

doi: 10.3799/dqkx.2018.118

1.
西藏自治区地质矿产勘查开发局第二地质大队, 西藏拉萨 850003
2.
西藏自治区地质矿产勘查开发局, 西藏拉萨 850000
3.
贵州省有色金属和核工业地质勘查局七总队, 贵州贵阳 550005

基金项目:

中国地质调查局项目 121201004000160901-47

中国地质调查局项目 121201004000150017-95

详细信息

作者简介:
赵亚云(1988-), 男, 硕士研究生, 现从事青藏高原矿产勘查与研究工作

中图分类号: P597
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出版历程
- 收稿日期: 2018-05-05
- 刊出日期: 2018-12-15

Zircon U-Pb Ages and Geochemical Characteristics of Youqiumi Porphyry Pluton in Cimabanshuo Area, Tibet

1.
No.2 Geological Team, Tibet Autonomous Region Geological Mining Exploration and Development Bureau, Lhasa 850003, China
2.
Tibet Autonomous Region Geological Mining Exploration and Development Bureau, Lhasa 850000, China
3.
No.7 Geological Team, Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China

摘要

摘要: 西藏次玛班硕地区含矿斑岩体具备斑岩型铜矿成矿有利地质条件，结合本地区野外工作的新认识和新发现，展开该地区成岩成矿地质背景及成因等问题研究.对次玛班硕地区由秋米斑岩体开展了详细的锆石U-Pb测年及岩石地球化学研究，结果表明：花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄为15.2±0.8 Ma~15.2±0.7 Ma，即形成时代为中新世.花岗闪长斑岩具有高硅（SiO₂=65.08%~66.85%）、高钾（K₂O=3.85%~4.58%）、富碱（K₂O+Na₂O=7.87%~8.90%）、贫镁（MgO=1.51%~1.84%）、准铝质（A/CNK=0.88~0.95）地球化学特征.稀土元素配分模式右倾，具有弱的铕负异常，（La/Yb）_N=36.60~47.43，富集强不相容元素（Rb、Th、U、K）和亏损高场强元素（Nb、Ta、Ce、P、Ti）；特殊地，岩石具有典型埃达克岩地球化学特征，即：高Sr（674×10^-6~876×10^-6）、低Yb（0.560×10^-6~0.757×10^-6）、低Y（7.97×10^-6~9.98×10^-6）、高Sr/Y比（73.84~109.98）.全岩Sr-Nd同位素组成中（⁸⁷Sr/⁸⁶Sr）_i=0.707 878、ε_Nd（t）=-8.26，Nd二阶段模式年龄T_2DM=1 503 Ma，说明其岩浆源于基性下地壳部分熔融.结合区域的火成岩，认为岩石形成于印度大陆与亚洲大陆后碰撞伸展构造背景.
- 西藏 /
- 次玛班硕 /
- 由秋米岩体 /
- 花岗闪长斑岩 /
- 锆石U-Pb年龄 /
- 地球化学
Abstract: The ore-bearing porphyry body has favorable geological conditions for porphyry copper mineralization in Cimabanshuo area, Tibet. Therefore, it is of great significance to study the geological background and genesis of diagenesis and mineralization in this area. In this paper, combined with their new understanding and new discoveries in the field works, the authors carried out a detailed research of zircon U-Pb dating and petrogeochemistry, for Youqiumi pluton in Cimabanshuo area.The results show that the granodiorite-poryphy yields an LA-ICP-MS zircon U-Pb age of 15.2±0.8 Ma to 15.2±0.7 Ma, namely the formation age of Miocene. Chemical analyses show that the granodiorite-poryphy has a characteristic of high SiO₂ (65.08%-66.85%), high K₂O (3.85%-4.58%), rich K₂O+Na₂O (7.87%-8.90%), depleted MgO (1.51%-1.84%), meta-aluminum (A/CNK=0.88-0.95). Chondrite-normalized REE distribution pattern diagrams display right-incline and weakly negative Eu anomalies, differentiated obviously (La/Yb)_N=36.60-47.43. Enriched strongly in compatible elements such as Rb, Th, U, K and depleted in high field strength elements (HFSEs) such as Nb, Ta, Ce, P, Ti. Specifically, Youqiumi granitic pluton shows typical adakitic signatures:high Sr (674×10^-6 to 876×10^-6) and low Yb (0.560×10^-6 to 0.757×10^-6) and low Y (7.97×10^-6 to 9.98×10^-6), contents with high Sr/Y ratios (73.84-109.98). However, the whole-rock Sr, Nd isotopic compositions of granodiorite-poryphy have initial ⁸⁷Sr/⁸⁶Sr ratios and ε_Nd(t) values are 0.707 878 and -8.26 respectively, with ancient Nd two-phase model ages of 1 503 Ma, which indicate that the magma sources may have contributed to partial melting of previous juvenile lower crust.Combined with igneous rocks in the studied area, it is proposed that Youqiumi granitic pluton was formed in post-collisional extension setting of India-Asia contional collision orogenic belt.
- Tibet /
- Cimabanshuo /
- Youqiumi pluton /
- granodiorite porphyry /
- zircon U-Pb age /
- geochemistry

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图 1 次玛班硕地区地质简图(a)、大地构造位置(b)及朱诺外围地质图(c)

1.帕那组二段；2.帕那组一段；3.年波组二段；4.年波组一段；5.典中组三段；6.花岗闪长斑岩；7.黑云花岗闪长斑岩；8.黑云花岗闪长岩；9.岩脉；10.断层；11.铜矿化体；12.孔雀石化区；13.铜矿体；14.褐铁矿化蚀变区；15.采样位置；16.朱诺铜矿.Ⅰ.喜马拉雅板块；Ⅱ.雅鲁藏布江缝合带；Ⅲ.日喀则弧前盆地；Ⅵ.冈底斯-念青唐古拉复合岩浆弧；Ⅳ-1.南冈底斯岩浆弧；Ⅳ-2.桑日火山弧；Ⅳ-3.叶巴火山弧；Ⅳ-4.隆格尔-念青唐古拉复合火山岩浆弧；Ⅳ-5.措勤-多瓦复合弧后前陆盆地；Ⅳ-6.则弄火山岩浆弧；Ⅴ.狮泉河-拉果错-阿索-永珠-纳术错-嘉黎-波密弧弧碰撞带；Ⅵ.昂龙岗日-班戈-伯舒拉岭岩浆弧；Ⅶ.班公湖-怒江缝合带；Ⅷ.南羌塘.图b李淼等(2015)

Fig. 1. Geological sketch (a) and tectonic location (b) of Cimabanshuo area, and geological map of Zhunuo outer area (c)

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图 2 由秋米斑岩体野外及镜下特征

a.花岗闪长斑岩裂隙面中蓝铜矿化；b.花岗闪长斑岩；c.岩石中方解石脉及黄铜矿化；d.钾长石斑晶与黄铜矿化；e，f.花岗闪长斑岩显微镜下特征；Az.蓝铜矿；Cp.黄铜矿；Py.黄铁矿；Cc.方解石化

Fig. 2. Photographs showing field and microscopic characteristics for the Youqiumi porphyry pluton

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图 3 次玛班硕由秋米斑岩体锆石CL图

Fig. 3. Representative cathodoluminescence(CL) of zircon from the Youqiumi porphyry pluton in Cimabanshuo area

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图 4 次玛班硕由秋米斑岩体LA-ICP-MS锆石U-Pb年龄谐和图

Fig. 4. LA-ICP-MS U-Pb concordia diagrams of zircon from the Youqiumi porphyry pluton in Cimabanshuo area

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图 5 次玛班硕由秋米斑岩体TAS图(a)、SiO₂-K₂O图(b)和A/CNK-A/NK图(c)

图a底图据Le Maitre(1989); 图b底图据Peccerillo and Taylor(1976); 图c底图据Maniar and Piccoli(1989)

Fig. 5. TAS (a), SiO₂-K₂O (b) and A/CNK-A/NK (c) diagrams of the Youqiumi porphyry pluton in Cimabanshuo area

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图 6 次玛班硕由秋米斑岩体稀土元素配分模式(a)和微量元素蛛网图(b)

Fig. 6. Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized trace element spider diagram(b) of the Youqiumi porphyry pluton in Cimabanshuo area

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图 7 次玛班硕由秋米斑岩体Sr/Y-Y图(a)、MgO-SiO₂图(b)和A/MF-C/MF图(c)

图a底图据Defant and Drummond(1990); 图b底图据Defant et al.(2002); 图c底图据Altherr et al.(2000)

Fig. 7. Sr/Y-Y (a), MgO-SiO₂ (b) and A/MF-C/MF (c) diagrams of the Youqiumi porphyry pluton in Cimabanshuo area

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图 8 次玛班硕由秋米斑岩体R1-R2构造判别图

底图据Batchelor and Bowden(1985)

Fig. 8. R1-R2 tectonic diagram of the Youqiumi porphyry pluton in Cimabanshuo area

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表 1 样品采集位置与岩性

Table 1. Sampling position and lithology

序号	采样地点	样品号	北纬	东经	岩石名称
1	由秋米北	D1754/3	29°36′03″	87°22′29″	花岗闪长斑岩
2	由秋米北	D1755/2	29°36′01″	87°22′10″	花岗闪长斑岩
3	由秋米北	D1756/1	29°35′56″	87°21′48″	花岗闪长斑岩
4	由秋米西	16SGS-6a/b	29°35′23″	87°21′20″	花岗闪长斑岩
5	仁当勒	16SGS-7a/b	29°35′31″	87°20′24″	花岗闪长斑岩
6	仁当勒	16SGS-8a/b	29°35′27″	87°20′23″	花岗闪长斑岩
7	仁当勒	16SGS-9	29°35′18″	87°20′18″	花岗闪长斑岩
8	仁当勒	16SGS-12	29°35′19″	87°20′17″	花岗闪长斑岩
9	朗拉南	16SGS-13	29°35′18″	87°21′18″	花岗闪长斑岩
10	朗拉南	16SGS-14	29°35′17″	87°21′16″	花岗闪长斑岩

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表 2 次玛班硕由秋米斑岩体LA-ICP-MS锆石U-Pb同位素分析结果

Table 2. LA-ICP-MS U-Pb data of zircon from the Youqiumi porphyry pluton in Cimabanshuo area

分析点号	Pb(10^-6)	Th(10^-6)	U(10^-6)	Th/U	同位素比值			年龄(Ma)
分析点号	Pb(10^-6)	Th(10^-6)	U(10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ	²⁰⁶Pb/²³⁸U±1σ
D1756/1
1	2	365	547	0.67	0.048 3±0.004 3	0.016 6±0.001 5	0.002 5±0.000 05	16.0±0.3
2	2	427	510	0.84	0.049 7±0.005 1	0.016 3±0.001 7	0.002 4±0.000 05	15.3±0.3
3	5	2 367	1 341	1.77	0.068 7±0.002 4	0.021 0±0.000 7	0.002 2±0.000 03	14.3±0.2
4	14	1 955	1 520	1.29	0.075 1±0.001 7	0.062 3±0.001 3	0.006 0±0.000 07	38.6±0.4
5	13	365	1 484	0.25	0.061 4±0.002 5	0.062 5±0.002 5	0.007 4±0.000 09	47.5±0.6
6	3	595	746	0.80	0.067 0±0.006 7	0.023 9±0.002 4	0.002 6±0.000 05	16.7±0.3
7	3	381	458	0.83	0.046 1±0.007 6	0.013 5±0.002 2	0.002 1±0.000 04	13.6±0.3
8	3	657	583	1.13	0.048 3±0.006 5	0.015 3±0.002 0	0.002 3±0.000 05	14.8±0.3
9	3	620	797	0.78	0.047 3±0.003 9	0.016 3±0.001 3	0.002 5±0.000 05	16.2±0.3
10	4	1 215	873	1.39	0.063 7±0.009 0	0.020 9±0.002 9	0.002 4±0.000 04	15.3±0.3
11	3	754	771	0.98	0.049 0±0.005 4	0.016 3±0.001 8	0.002 4±0.000 05	15.6±0.3
16S-6
1	7.69	1 576	2 481	0.64	0.133 6±0.019 5	0.035 5±0.002 7	0.002 4±0.000 1	15.5±0.6
2	7.56	1 557	2 334	0.67	0.121 8±0.008 7	0.039 7±0.003 1	0.002 5±0.000 1	15.9±0.6
3	8.16	1 572	2 592	0.61	0.125 0±0.015 9	0.038 1±0.003 6	0.002 5±0.000 1	16.4±0.6
4	6.58	1 199	2 133	0.56	0.131 3±0.012 5	0.037 2±0.002 3	0.002 4±0.000 1	15.5±0.6
5	6.86	1 254	2 524	0.50	0.196 5±0.049 7	0.041 9±0.006 1	0.002 4±0.000 1	15.4±0.6
6	10.14	2 008	3 396	0.59	0.101 2±0.011 2	0.030 1±0.002 7	0.002 4±0.000 1	15.5±0.5
7	5.74	1 168	1 651	0.71	0.192 4±0.023 4	0.052 6±0.004 0	0.002 6±0.000 1	16.9±0.7
8	8.91	2 078	2 874	0.72	0.128 5±0.012 4	0.036 5±0.002 8	0.002 4±0.000 1	15.5±0.5
9	8.24	1 648	2 358	0.70	0.140 3±0.016 9	0.041 1±0.002 7	0.002 6±0.000 1	16.5±0.7
10	10.16	1 456	3 052	0.48	0.091 3±0.008 2	0.031 7±0.002 8	0.002 7±0.000 1	17.4±0.6
11	9.70	1 845	2 828	0.65	0.115 1±0.009 9	0.037 7±0.003 4	0.002 5±0.000 1	16.2±0.6
12	7.99	1 324	2 444	0.54	0.145 4±0.016 2	0.041 8±0.003 2	0.002 4±0.000 1	15.5±0.5
13	10.68	2 442	3 061	0.80	0.126 8±0.011 9	0.041 5±0.003 4	0.002 5±0.000 1	16.4±0.5
14	11.18	2 074	2 549	0.81	0.163 5±0.019 0	0.051 0±0.003 2	0.002 5±0.000 1	16.4±0.6
15	9.34	2 067	2 842	0.73	0.115 3±0.010 2	0.036 2±0.002 8	0.002 4±0.000 1	15.3±0.5
16	9.04	1 531	3 157	0.49	0.112 7±0.014 0	0.031 1±0.002 4	0.002 4±0.000 1	15.6±0.6
17	7.39	1 342	2 258	0.59	0.149 8±0.012 1	0.048 7±0.003 5	0.002 4±0.000 1	15.6±0.6
18	8.37	1 868	2 626	0.71	0.133 5±0.010 2	0.042 1±0.003 0	0.002 4±0.000 1	15.5±0.5
19	9.92	2 153	3 130	0.69	0.108 8±0.012 6	0.034 1±0.003 4	0.002 4±0.000 1	15.6±0.5
20	10.26	1 967	2 984	0.66	0.122 6±0.009 7	0.041 8±0.003 2	0.002 6±0.000 1	16.9±0.6
21	6.99	1 412	2 322	0.61	0.150 0±0.017 6	0.040 9±0.002 6	0.002 4±0.000 1	15.2±0.6
22	7.75	1 366	2 672	0.51	0.144 0±0.016 7	0.047 0±0.004 5	0.002 5±0.000 1	16.2±0.6
23	10.04	1 648	2 559	0.64	0.125 3±0.008 8	0.041 8±0.003 4	0.002 5±0.000 1	16.0±0.5
24	7.69	1 576	2 481	0.64	0.133 6±0.019 5	0.035 5±0.002 7	0.002 4±0.000 1	15.5±0.6
25	7.56	1 557	2 334	0.67	0.121 8±0.008 7	0.039 7±0.003 1	0.002 5±0.000 1	15.9±0.6
26	8.16	1 572	2 592	0.61	0.125 0±0.015 9	0.038 1±0.003 6	0.002 5±0.000 1	16.4±0.6

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表 3 次玛班硕由秋米斑岩体岩石地球化学分析结果及特征参数

Table 3. Geochemistry element analyses of results and characteristic parameters of the Youqiumi porphyry pluton in Cimabanshuo area

样品号	D1754/3	D1755/2	D1756/1	16SGS-6a/b	16SGS-7a/b	16SGS-8a/b	16SGS-9	16SGS-12	16SGS-13	16SGS-14
SiO₂	66.36	65.36	65.08	65.12	66.38	66.36	65.62	66.32	66.85	66.05
TiO₂	0.57	0.57	0.61	0.67	0.55	0.53	0.58	0.56	0.49	0.49
Al₂O₃	15.42	16.15	15.92	15.32	15.14	15.12	15.19	15.13	14.56	14.42
Fe₂O₃	1.41	1.38	1.50	0.93	1.69	1.89	1.84	1.79	0.10	0.04
FeO	1.68	1.70	1.85	2.72	1.94	1.99	1.85	2.22	2.59	2.68
MnO	0.05	0.05	0.05	0.04	0.05	0.06	0.05	0.06	0.03	0.03
MgO	1.58	1.64	1.84	1.83	1.58	1.51	1.69	1.56	1.51	1.51
CaO	2.86	3.48	3.50	2.47	2.77	2.76	3.02	3.16	2.01	2.40
Na₂O	4.30	4.56	4.42	4.70	4.05	3.98	4.32	4.02	4.30	4.32
K₂O	4.21	3.94	3.98	3.67	4.29	3.96	4.07	3.85	4.56	4.58
P₂O₅	0.19	0.21	0.22	0.24	0.19	0.20	0.22	0.20	0.17	0.18
H₂O⁺	0.84	0.55	0.63	1.23	0.92	0.87	0.96	0.75	1.63	1.85
LOI	0.24	0.10	0.10	1.86	1.06	1.04	1.37	0.93	2.33	2.76
Total	99.71	99.69	99.70	100.80	100.61	100.27	100.78	100.55	101.13	101.31
K₂O/Na₂O	0.98	0.86	0.90	0.78	1.06	0.99	0.94	0.96	1.06	1.06
K₂O+Na₂O	8.51	8.50	8.40	8.37	8.34	7.94	8.39	7.87	8.86	8.90
A/NK	1.326	1.373	1.375	1.309	1.339	1.396	1.319	1.403	1.212	1.195
A/CNK	0.916	0.893	0.887	0.946	0.926	0.954	0.893	0.916	0.930	0.878
AR	2.74	2.53	2.52	2.78	2.65	2.60	2.71	2.51	3.16	3.11
Rb	220.00	221.00	173.00	163.00	245.00	239.00	195.00	231.00	212.00	212.00
Th	29.20	25.30	27.20	15.20	28.60	29.20	27.30	31.50	30.40	31.20
U	4.80	4.10	3.90	2.89	2.56	2.65	2.71	2.63	10.30	12.20
Nb	8.90	8.90	8.20	5.91	10.20	10.10	9.75	10.00	5.69	6.89
Ta	0.88	0.87	0.77	0.56	0.98	0.95	0.97	0.92	0.52	0.63
Sr	703.00	876.00	852.00	795.00	714.00	774.00	812.00	815.00	685.00	674.00
Zr	139.00	141.00	127.00	178.00	182.00	184.00	189.00	182.00	189.00	180.00
Hf	4.00	3.40	4.10	5.26	5.25	5.02	4.96	5.12	5.65	5.71
Y	9.52	7.97	8.19	8.46	8.96	9.74	9.85	9.52	8.89	9.98
La	39.53	41.13	40.61	31.20	38.20	40.50	39.80	44.00	40.20	40.40
Ce	75.26	72.93	76.67	59.80	69.20	74.50	76.80	79.20	76.40	76.40
Pr	9.242	9.372	9.664	7.100	7.960	8.460	8.620	8.650	8.550	8.650
Nd	34.78	32.04	34.55	27.40	29.10	32.30	33.40	32.60	33.20	33.80
Sm	6.048	5.329	5.890	4.850	4.660	5.630	5.870	5.650	5.690	6.230
Eu	1.211	1.160	1.225	1.040	0.960	1.060	1.080	1.060	1.010	1.110
Gd	3.623	3.250	3.533	3.200	3.060	3.360	3.740	3.520	3.510	3.740
Tb	0.444	0.400	0.451	0.420	0.400	0.440	0.460	0.440	0.450	0.480
Dy	2.174	1.944	2.067	1.700	1.640	1.740	1.980	1.820	1.830	1.980
Ho	0.398	0.343	0.357	0.270	0.280	0.300	0.320	0.300	0.290	0.330
Er	0.968	0.805	0.862	0.700	0.760	0.820	0.880	0.820	0.760	0.900
Tm	0.133	0.109	0.118	0.090	0.100	0.110	0.120	0.110	0.100	0.120
Yb	0.757	0.622	0.636	0.560	0.680	0.700	0.780	0.730	0.630	0.730
Lu	0.109	0.090	0.087	0.070	0.090	0.090	0.100	0.100	0.090	0.100
Sr/Y	73.84	109.98	104.00	93.97	79.69	79.47	82.44	85.61	77.05	67.54
Nb/Ta	10.11	10.23	10.65	10.55	10.41	10.63	10.05	10.87	10.94	10.94
Zr/Hf	34.75	41.47	30.98	33.84	34.67	36.65	38.10	35.55	33.45	31.52
∑REE	174.68	169.52	176.72	138.40	157.09	170.01	173.95	179.00	172.71	174.97
(La/Yb)_N	37.46	47.43	45.80	39.96	40.30	41.50	36.60	43.23	45.77	39.70
δEu	0.73	0.79	0.76	0.76	0.73	0.69	0.66	0.68	0.64	0.65
δCe	0.93	0.88	0.92	0.95	0.92	0.94	0.97	0.94	0.96	0.95
注：A/CNK=Al₂O₃/(CaO+Na₂O+K₂O)(摩尔比值)，主量元素单位为%，微量元素单位为10^-6.

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表 4 次玛班硕由秋米斑岩体Sr、Nd同位素组成

Table 4. Sr, Nd isotopic compositions of the Youqiumi porphyry pluton in Cimabanshuo area

样号	年龄(Ma)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ	(⁸⁷Sr/⁸⁶Sr)_i	ε_Sr(0)	ε_Sr(t)	f_Rb/Sr	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	2σ	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	f_Sm/Nd	T_DM2(Ma)
D1756/1	15.2	0.571 400	0.708 002	4	0.707 878	49.709	48.213	5.909	0.103 100	0.512 205	6	0.512 195	-8.26	-0.48	1 503
注：计算所需的参数：λ_Sr=1.39×10^-11 a^-1，λ_Nd=6.54×10^-12 a^-1，⁸⁷Sr/⁸⁶Sr和¹⁴³Nd/¹⁴⁴Nd所示的2σ误差为小数点后的最后位数，为减少¹⁴⁷Sm/¹⁴⁴Nd变化对Nd模式年龄计算产生的影响，表中所列T_DM2年龄统一采用二阶段模式计算，计算公式如下:T_DM2=(1/λ_Sm)ln(1+A)，A={(¹⁴³Nd/¹⁴⁴Nd)_m-(¹⁴³Nd/¹⁴⁴Nd)_DM-[(¹⁴⁷Sm/¹⁴⁴Nd)_m-(¹⁴⁷Sm/¹⁴⁴Nd)_c](e^λt-1)}/[(¹⁴⁷Sm/¹⁴⁴Nd)_c-(¹⁴⁷Sm/¹⁴⁴Nd)_DM]，式中：下角标m代表样品现今测定值，下角标DM代表亏损地幔值(Miller and O'Nions，1985)，(¹⁴⁷Sm/¹⁴⁴Nd)_DM=0.213 6.(¹⁴³Nd/¹⁴⁴Nd)_DM=0.513 151，下角标CHUR代表球粒陨石值(Bouvier et al., 2008)，(¹⁴⁷Sm/¹⁴⁴Nd)_CHUR=0.196 0；(¹⁴³Nd/¹⁴⁴Nd)_CHUR=0.512 630，下角标c代表大陆壳平均值(Jahn and Condie, 1995)，(¹⁴⁷Sm/¹⁴⁴Nd)_c=0.118；岩石样品计算年龄采用项目所测对应样品锆石U-Pb年龄值.

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表 5 冈底斯成矿带典型矿床成岩成矿时代

Table 5. The typical deposits of diagenesis and ore-forming ages in Gangdese metallogenic belt

冈底斯段	典型矿床	成岩年龄			成矿年龄			资料来源
冈底斯段	典型矿床	测试对象	方法	年龄(Ma)	测试对象	方法	年龄(Ma)	资料来源
		花岗闪长岩	LA-ICP-MS锆石U-Pb	17.6±0.4	辉钼矿	Re-Os	16~15	秦克章等(2014)
		黑云母二长花岗岩		17.4±0.4
		似斑状黑云母二长花岗岩		16.7±0.4
东段	驱龙	二长花岗斑岩		15.3±0.6
		花岗闪长斑岩		15.0±0.3
		石英闪长玢岩		13.1±0.3
		二长花岗斑岩	LA-ICP-MS锆石U-Pb	16.6±0.3
中段	岗讲	花岗闪长斑岩		16.1±0.2	辉钼矿	Re-Os	13.24~13.33	杨震等(2017)
		英云闪长玢岩		14.4±0.4
		花岗斑岩	SHRIMP锆石U-Pb	15.6±0.6				郑有业等(2007) 黄勇等(2015) Huang et al.(2017) 高成等(2014)
		花岗闪长斑岩		14.1±0.3
		石英斑岩		14.4±0.3
中段之西	朱诺	闪长斑岩	LA-ICP-MS锆石U-Pb	16.2±0.3	辉钼矿	Re-Os	13.7±0.6
		黑云花岗闪长岩		14.1±0.3
		似斑状二长花岗岩		14.0±0.3
		角闪闪长玢岩		14.1±0.3
		斑状花岗岩		14.9~15.3

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