云南哀牢山构造带仰宗流纹斑岩锆石U-Pb年龄、地球化学特征及其构造意义

孙崇波; 李忠权; 王道永; 许远平; 李滔; 赵云川

云南哀牢山构造带仰宗流纹斑岩锆石U-Pb年龄、地球化学特征及其构造意义

1.
国土资源部构造成矿成藏重点实验室 (成都理工大学)/油气藏地质及开发工程国家重点实验室 (成都理工大学), 四川成都 610059

2.
四川冶金地质勘查局水文工程大队, 四川成都 611730

基金项目:
中国地质调查局项目《西南三江成矿带南段基础地质调查》（编号：1212010880406、1212011120582）

详细信息

作者简介: 孙崇波 (1985-), 男, 在读博士生, 构造地质学专业。E-mail:1315333036@qq.com

中图分类号: P588.14⁺¹; P597⁺.3

收稿日期: 2015-12-09

修回日期: 2016-09-11

刊出日期: 2017-03-25

Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt

1.
Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources (Chengdu University of Technology)/State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology) Chengdu 610059, Sichuan, China

2.
Hydro-Engineering Party of Sichuan Metallurgical Geology and Exploration Bureau, Chengdu 611730, Sichuan, China

Received Date: 09 December 2015

Revised Date: 11 September 2016

Publish Date: 25 March 2017

摘要

摘要:
对云南绿春县仰宗流纹斑岩进行了锆石U-Pb年龄、岩石地球化学分析。LA-ICP-MS锆石U-Pb测年显示，仰宗流纹斑岩年龄为263.1±2.3Ma，形成于晚二叠世。岩石地球化学分析显示，仰宗流纹斑岩SiO₂含量为71.08%~80.26%，全碱（Na₂O+K₂O）含量为4.67%~8.67%，且Na₂O＜K₂O；岩石轻、重稀土元素存在一定的分馏，负Eu异常明显（δEu=0.05~0.57），相对富集Rb、Th、U、Ni、Cs、Zr、Hf、As、K等元素，亏损Sr、Ta、Ba、Cr、Zn、W等元素。结果显示，仰宗流纹斑岩形成于碰撞期后的陆内构造环境，表明哀牢山构造带的古特提斯支洋或弧后盆地在晚二叠世（263.1±2.3Ma）可能已经闭合。
- 流纹斑岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- 岩石地球化学 /
- 板内型花岗岩
Abstract:
This paper presents bulk petrogeochemistry and zircon U-Pb dating results for the Yangzong rhyolite porphyry in Luchun County, Yunnan Province. LA-ICP-MS zircon U-Pb dating results show that the Yangzong rhyolite porphyry was formed in the Late Permian (263.1±2.3Ma). The Yangzong rhyolite porphyry is characterized by SiO₂ content of 71.08%~80.26%, alkali (Na₂O+ K₂O) 4.67%~8.67%, and Na₂O＜K₂O. It is enriched in LREE and Rb, Th, U, Ni, Cs, Zr, Hf, As, K and depleted in Sr, Ta, Ba, Cr, Zn, W with negative Eu anomalies (δEu=0.05~0.57). According to the diagrams, the Yangzong rhyolit porphyry was formed in the tectonic environment of island arc-continent or continental-arc collision, indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailao Mountain tectonic belt might have been closed in the Late Permian (263.1±2.3Ma).
- rhyolite porphyry /
- LA-ICP-MS zircon U-Pb ages /
- petrogeochemistry /
- intraplate granite

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图 1 区域构造图 (a) 及仰宗地区地质略图 (b)

Figure 1.

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图 2 样品野外（a）和镜下照片（b）

Figure 2.

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图 3 样品PM15Z流纹斑岩锆石颗粒阴极发光（CL）图像

Figure 3.

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图 4 仰宗流纹斑岩锆石U-Pb年龄谐和图 (a) 及加权平均年龄图 (b)

Figure 4.

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图 5 R₁-R₂图解^[19]

Figure 5.

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图 6 构造环境图解^[20]

Figure 6.

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图 7 稀土元素配分模式图 (a) 和原始地幔标准化蛛网图（b）（标准值据参考文献[21]，样品序号见表 3）

Figure 7.

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表 1 仰宗流纹斑岩LA-ICP-MS锆石U-Th-Pb同位素测试结果

Table 1. LA-ICP-MS zircon U-Th-Pb analytical results of the Yangzong rhyolite porphyry

测点	含量/10^-6			Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	同位素年龄/Ma
测点	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²⁰⁶Pb	1σ
1	14	141	317	0.45	0.05343	0.00083	0.04258	0.00040	0.3137	0.0053	268.8	2.5	277.0	4.7	347.2	35.11
2	15	85	378	0.23	0.05102	0.00072	0.04154	0.00036	0.2922	0.0044	262.4	2.3	260.3	3.9	241.8	32.6
3	16	145	381	0.38	0.05156	0.00074	0.04090	0.00034	0.2908	0.0042	258.4	2.2	259.2	3.7	266.2	32.8
4	16	143	371	0.39	0.05768	0.00182	0.04197	0.00044	0.3338	0.0130	265.0	2.8	292.4	11.9	517.7	69.2
5	15	145	354	0.41	0.05051	0.00074	0.04237	0.00038	0.2951	0.0047	267.5	2.4	262.6	4.2	218.7	33.8
6	43	246	1078	0.23	0.05060	0.00027	0.04099	0.00037	0.2860	0.0022	259.0	2.4	255.4	2.0	222.5	12.4
7	25	298	591	0.50	0.05044	0.00060	0.04061	0.00033	0.2824	0.0036	256.6	2.1	252.6	3.2	215.2	27.5
8	17	180	422	0.43	0.04901	0.00074	0.04082	0.00032	0.2759	0.0043	257.9	2.0	247.4	3.9	148.4	35.2
9	14	152	334	0.45	0.05059	0.00083	0.04072	0.00033	0.2840	0.0049	257.3	2.1	253.8	4.4	222.0	38.0
10	15	114	358	0.32	0.05299	0.00089	0.04253	0.00039	0.3107	0.0058	268.5	2.5	274.7	5.1	328.3	37.9
11	12	139	282	0.49	0.05372	0.00128	0.04174	0.00042	0.3092	0.0074	263.6	2.7	273.5	6.5	359.4	53.7
12	14	22	348	0.06	0.05227	0.00081	0.04196	0.00036	0.3024	0.0048	265.0	2.3	268.2	4.3	297.0	35.3
13	19	135	463	0.29	0.05170	0.00067	0.04121	0.00044	0.2938	0.0046	260.4	2.8	261.5	4.1	272.0	29.8
14	9	65	221	0.29	0.05250	0.00115	0.04245	0.00041	0.3073	0.0073	268.0	2.6	272.1	6.5	307.1	50.1
15	21	127	511	0.25	0.05414	0.00056	0.04233	0.00043	0.3160	0.0040	267.2	2.7	278.8	3.5	376.9	23.4
16	20	97	478	0.20	0.05683	0.00062	0.04209	0.00052	0.3298	0.0057	265.8	3.3	289.4	5.0	484.9	24.2
17	14	123	325	0.38	0.05157	0.00073	0.04267	0.00039	0.3034	0.0045	269.3	2.4	269.1	4.0	266.6	32.6
18	12	124	273	0.45	0.05309	0.00086	0.04221	0.00036	0.3090	0.0054	266.5	2.3	273.4	4.7	332.4	36.9

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表 2 仰宗流纹斑岩主量、微量和稀土元素分析数据

Table 2. Major, trace elements and REE compositions of the Yangzong rhyolite porphyry

样号	PM2904H2	PM2904H4	PM2904H5	PM3305H1	PM2905H2	PM2907H1	PM2908H3	PM2910H2	PM2911H1	PM2912H1
SiO₂	78.12	75.04	75.78	81.88	74.40	70.30	72.04	72.08	70.38	73.94
Al₂O₃	11.6	13.40	13.95	9.95	11.75	13.45	13.35	13.10	13.25	13.65
Fe₂O₃	0.10	0.31	0.51	0.02	2.38	2.03	2.39	1.99	2.67	1.44
FeO	0.28	0.52	0.22	0.15	0.60	1.49	0.45	2.53	1.71	0.67
P₂O₅	0.015	0.015	0.019	0.027	0.039	0.042	0.024	0.05	0.054	0.011
K₂O	4.14	4.82	5.85	2.92	6.36	6.79	7.42	4.41	5.53	6.05
Na₂O	4.34	4.70	0.22	3.32	0.43	1.63	0.58	3.45	2.73	0.21
MgO	0.11	0.23	0.68	0.05	0.50	0.58	0.52	0.73	0.66	0.58
CaO	0.08	0.04	0.03	0.04	0.06	0.11	0.05	0.27	0.19	0.02
TiO₂	0.06	0.08	0.07	0.05	0.40	0.63	0.48	0.61	0.62	0.49
MnO	0.026	0.016	0.032	0.007	0.033	0.043	0.035	0.062	0.049	0.026
烧失量	0.68	0.69	2.17	0.54	2.57	2.14	2.58	0.37	1.95	2.49
总量	99.55	99.86	99.53	98.95	99.52	99.23	99.92	99.65	99.80	99.58
Q	47.65	34.33	40.11	32.88	32.01	49.81	45.67	39.21	42.52	44.48
An	0.04	0.28	0.09	1.02	0.6	0.03	0.03	0.33	0	0
Ab	3.76	14.21	5.05	29.4	23.63	1.83	1.49	14.79	1.91	0.97
Or	38.81	41.35	45.10	26.25	33.42	36.85	40.16	36.76	44.89	42.25
C	4.28	3.42	4.45	2.30	2.62	6.95	6.04	4.15	4.94	6.19
Di	0	0	0	0	0	0	0	0	0	0
Hy	2.77	2.69	2.35	3.96	3.47	2.30	3.58	2.19	3.00	3.31
Il	0.79	1.23	0.95	1.17	1.21	0.96	0.94	0.85	0.86	0.87
Mt	1.81	2.39	1.83	2.91	2.91	1.25	2.02	1.66	1.84	1.87
Ap	0.09	0.10	0.06	0.12	0.13	0.03	0.06	0.06	0.06	0.07
DI	90.22	89.89	90.26	88.53	89.06	88.49	87.32	90.76	89.32	87.70
SI	4.92	4.65	4.62	5.57	4.99	6.52	6.84	4.38	6.29	6.69
AR	3.71	4.28	3.96	3.85	4.19	2.69	3.06	3.65	3.73	3.11
σ	1.45	2.56	2.18	2.12	2.46	1.25	1.54	2.02	1.94	1.69
NK	6.79	8.42	8.00	7.86	8.26	6.26	6.72	7.75	7.63	6.97
A/CNK	1.526	1.315	1.471	1.197	1.224	1.97	1.774	1.417	1.564	1.773
Sc	7.08	9.79	8.10	9.91	9.69	5.66	7.04	5.87	6.77	7.07
Cr	17.62	13.59	15.00	14.98	12.78	14.12	13.04	13.26	13.89	11.94
Co	5.31	5.54	6.56	6.79	5.87	3.92	4.19	3.64	4.95	5.07
Ni	10.81	6.02	10.18	8.26	6.02	5.77	5.83	5.87	7.00	6.09
Zn	93.70	51.08	64.78	77.22	68.52	35.77	77.14	37.49	74.53	42.14
Rb	313.5	327.8	340.2	218.7	263	532.8	499.5	327.5	387.1	528.6
Sr	34.75	53.91	56.84	46.48	44.28	31.65	49.80	78.82	43.26	53.01
Cs	5.66	4.63	5.24	3.15	4.14	9.13	10.96	10.64	10.28	13.62
Ba	796.3	939.3	955.8	674.7	820.3	634.4	867.1	876.2	783.4	958.4
Zr	208.9	393.5	248.2	402.3	401.3	333.8	324.0	307.1	280.2	301.9
Ta	1.05	1.34	1.21	1.31	1.36	1.36	1.31	1.22	1.27	1.25
Th	24.79	32.70	28.47	32.40	32.95	34.86	34.31	32.62	31.90	32.60
U	5.20	6.67	5.99	6.65	6.97	6.89	7.02	6.33	6.52	6.35
Hf	5.81	11.00	7.20	10.93	10.78	9.44	8.95	8.69	7.92	8.55
Cu	3.69	2.35	17.24	2.49	2.68	1.92	4.23	3.09	0.92	5.02
注：主量元素含量单位为%，微量和稀土元素为10^-6；Q为CIPW标准矿物石英；σ为里特曼指数

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表 3 仰宗流纹斑岩稀土元素丰度及主要参数

Table 3. REE analyses of the Yangzong rhyolite porphyry

样号	PM2904H2	PM2904H4	PM2904H5	PM3305H1	PM2905H2	PM2907H1	PM2908H3	PM2910H2	PM2911H1	PM2912H1
La	40.20	49.02	42.26	59.99	50.62	25.49	60.18	47.10	42.96	60.79
Ce	69.82	94.51	82.87	109.80	89.19	72.58	95.85	87.9	89.02	101.4
Pr	9.13	12.49	9.22	14.04	13.08	6.03	13.98	11.77	8.83	15.01
Nd	31.45	47.40	31.15	51.73	48.80	22.66	50.70	44.59	32.73	58.93
Sm	6.73	10.32	6.50	10.72	11.02	4.70	11.65	9.68	6.33	13.74
Eu	1.01	1.47	1.06	1.64	1.64	0.67	1.55	1.37	0.90	1.95
Gd	5.27	8.88	5.45	9.90	10.27	4.84	9.28	8.89	5.69	13.81
Tb	0.97	1.60	0.90	1.77	1.83	0.95	1.59	1.50	0.94	2.59
Dy	6.00	10.32	5.95	11.26	11.68	7.08	9.97	9.46	5.99	16.77
Ho	1.07	1.95	1.12	2.04	2.23	1.44	1.72	1.71	1.15	3.09
Er	3.06	5.65	3.34	5.72	6.2	4.27	5.03	4.87	3.39	8.00
Tm	0.48	0.91	0.53	0.91	0.94	0.71	0.84	0.75	0.57	1.18
Yb	2.94	5.38	3.25	5.58	5.76	4.18	5.01	4.36	3.34	6.66
Lu	0.43	0.81	0.49	0.87	0.86	0.63	0.79	0.68	0.52	0.95
Y	27.61	50.15	28.73	57.03	58.78	38.08	45.87	45.54	28.88	89.56
ΣREE	178.56	250.70	194.10	285.96	254.11	156.21	268.15	234.62	202.35	304.89
LREE	158.33	215.2	173.07	247.89	214.34	132.12	233.92	202.41	180.77	251.84
HREE	20.23	35.50	21.03	38.07	39.77	24.09	34.23	32.21	21.58	53.06
LREE/ La_N	7.83	6.06	8.23	6.51	5.39	5.48	6.83	6.28	8.38	4.75
HREE/ Yb_N	9.81	6.53	9.32	7.71	6.30	4.37	8.62	7.76	9.23	6.55
δEu	0.50	0.46	0.53	0.48	0.46	0.42	0.44	0.44	0.45	0.43
δCe	0.86	0.91	0.98	0.89	0.83	1.39	0.78	0.89	1.06	0.80
注：样品从左到右序号为1~10，与图 7中序号对应

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云南哀牢山构造带仰宗流纹斑岩锆石U-Pb年龄、地球化学特征及其构造意义

1. 国土资源部构造成矿成藏重点实验室 (成都理工大学)/油气藏地质及开发工程国家重点实验室 (成都理工大学), 四川 成都 610059 2. 四川冶金地质勘查局水文工程大队, 四川 成都 611730

作者简介: 孙崇波 (1985-), 男, 在读博士生, 构造地质学专业。E-mail:1315333036@qq.com

Petrogeochemistry and zircon U-Pb chronology of the Yangzong rhyolite porphyry along Ailao Mountain tectonic belt

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1.
国土资源部构造成矿成藏重点实验室 (成都理工大学)/油气藏地质及开发工程国家重点实验室 (成都理工大学), 四川成都 610059

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四川冶金地质勘查局水文工程大队, 四川成都 611730