哀牢山构造带南段扭只二长花岗斑岩地球化学特征及其锆石U-Pb年代学研究

孙崇波; 李忠权; 王道永; 许远平; 李友余

哀牢山构造带南段扭只二长花岗斑岩地球化学特征及其锆石U-Pb年代学研究

1. 成都理工大学沉积地质研究院, 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;
3. 四川冶金地质勘查局606大队, 四川成都 611730

基金项目:

中国地质调查局项目(1212010880406

1212011120582)资助。

详细信息

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

中图分类号: P597.3;P588.13
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出版历程
- 收稿日期: 2014-11-14
- 修回日期: 2015-01-19
- 网络出版日期: 2023-09-25
- 刊出日期: 2016-02-24

Petrogeochemistry and zircon U-Pb chronology of the Niuzhi monzonitic porphyry in southern segment of Ailao Mountain tectonic belt

1. Research Institute of sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. Hydro-Engineering Party, Sichuan Bureau of Metallurgical Geology and Exploration, Chengdu 611730, Sichuan, China;
3. No. 606 Exploration Party, Sichuan Bureau of Metallurgical Geology and Exploration, Chengdu 611730, Sichuan, China

Funds:

Supported by China Geological Surrey Program (No. 1212010880406, No. 1212011120582).

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摘要

摘要: 本文对云南墨江县扭只二长花岗斑岩进行了锆石U-Pb年代学、岩石地球化学分析。LA-ICP-MS锆石U-Pb测年显示扭只二长花岗斑岩年龄为(263.5±1.7)Ma,形成于晚二叠世。岩石地球化学分析显示:扭只二长花岗斑岩SiO₂含量为55.30%~74.37%,全碱(Na₂O+K₂O)含量2.56%~7.57%,且Na₂O>K₂O;岩石富集轻稀土,负铕异常明显(δEu:0.74~1.06),相对富集Sc、Co、Cs、As等元素,亏损Cr、Ni、Zn、Rb、Sr、Ba、Zr、Ta、Th、U、W等元素。根据图解显示扭只二长花岗斑岩形成于岛弧向陆陆碰撞或者陆弧碰撞的构造环境,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((263.5±1.7)Ma)可能已经闭合。
- 二长花岗斑岩 /
- 锆石U-Pb年代学 /
- 岩石地球化学 /
- 同碰撞期花岗岩
Abstract: This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Niuzhi monzonitic porphyry in Mojiang, Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Niuzhi monzonitic porphyry formed in the Late Permian (263.5±1.7 Ma). The Niuzhi monzonitic porphyry is characterized by SiO₂ content of 55.30%-74.37%, alkali (Na₂O+K₂O) 2.56%-7.57%, and Na₂O higher than K₂O. It is enriched in LREE and Sc, Co, Cs, As, and depleted in Cr, Ni, Zn, Rb, Sr, Ba, Zr, Ta, Th, U, W, with negative Eu anomalies (δ Eu 0.74-1.06). According to the diagrams, the Niuzhi monzonitic porphyry 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 Ailaoshan tectonic belt may have been closed in the Late Permian (263.5±1.7 Ma).
- monzonitic porphyry /
- zircon U-Pb chronology /
- petrogeochemistry /
- syn-collisional granite

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图 1 区域构造图(b)及扭只地区地质略图(a)

Figure 1. Regional structure (b) and geological sketch map of Niuzhi (a)

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图 2 锆石颗粒CL图像

Figure 2. CL images of zircons

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图 3 扭只二长花岗斑岩LA-ICP-MS锆石U-Pb年龄谐和图

Figure 3. LA-ICP-MS zircon U-Pb concordia diagrams of the Niuzhi monzogranite porphyry

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图 4 R₁-R₂图解(底图据文献[25])

Figure 4. R₁-R₂ diagram (after reference [25])

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图 5 构造环境图解(底图据文献[26])

Figure 5. Diagram of tectonic environment (after reference [26])

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图 6 稀土元素配分模式图(a)和原始地幔标准化蛛网图(b)(标准值据文献[27])

Figure 6. Chondrite-normalized REE patterns of Niuzhi monzogranite porphyry (a) and primitive mantle-normalized trace element spider diagram(b)(normalization values after reference[27])

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表 1 扭只二长花岗斑岩LA-ICP-MS锆石U/Pb同位素测试结果

Table 1 LA-ICP-MS zircon U-Pb analyses of the Niuzhi monzogranite porphyry

样品号	含量10^-6		同位素比值						表面年龄/Ma
样品号	²⁰⁶Pb/²³⁸U	lσ	²⁰⁷Pb/²³⁵U	lσ	²⁰⁷Pb/²⁰⁶Pb	lσ	²⁰⁶Pb/²³⁸U	lσ	²⁰⁷Pb/²³⁵U	lσ	²⁰⁷Pb/²⁰⁶Pb	lσ
PM33Z1	352	679	0.042 3	0.000 4	0.30	0.003 1	0.050 7	0.000 3	267.0	2.6	268.2	2.7	225.4	15.3
PM33Z2	318	381	0.042 5	0.000 4	0.31	0.004 2	0.051 8	0.000 6	268.4	2.3	274.7	3.7	275.2	26.1
PM33Z31	124	248	0.042 2	0.000 4	0.30	0.005 8	0.050 0	0.000 9	266.3	2.3	263.3	5.2	192.4	41.2
PM33Z32	307	467	0.040 8	0.000 4	0.31	0.006 7	0.055 7	0.000 9	257.8	2.3	277.0	5.9	442.3	37.5
PM33Z4	1033	127	0.040 9	0.000 3	0.29	0.001 8	0.051 8	0.000 2	258.5	2.0	260.2	1.6	276.2	10.7
PM33Z5	951	1087	0.040 5	0.000 3	0.33	0.002 5	0.057 8	0.000 4	256.1	1.9	284.2	2.2	521.4	15.5
PM33Z6	432	281 1	0.041 4	0.000 4	0.34	0.003 6	0.059 8	0.000 3	261.8	2.3	298.5	3.2	596.3	12.5
PM33Z7	840	680	0.042 9	0.000 3	0.31	0.002 9	0.052 8	0.000 5	270.8	2.1	275.9	2.5	319.6	22.2
PM33Z8	309	574	0.041 5	0.000 3	0.30	0.002 6	0.053 0	0.000 4	262.3	2.0	269.2	2.3	329.6	17.9
PM33Z9	385	616	0.042 2	0.000 4	0.31	0.002 4	0.052 7	0.000 4	266.8	2.2	271.7	2.1	314.7	15.2
PM33Z10	427	650	0.041 5	0.000 4	0.30	0.002 7	0.052 2	0.000 3	262.4	2.3	265.8	2.4	296.0	15.1
PM33Z11	228	321	0.041 8	0.000 3	0.32	0.004 9	0.055 6	0.000 7	263.9	2.1	282.4	4.3	438.1	29.4
PM33Z12	299	553	0.041 9	0.000 3	0.32	0.002 5	0.054 8	0.000 4	264.6	2.1	279.4	2.2	405.0	16.8
PM33Z13	386	793	0.042 5	0.000 4	0.31	0.002 8	0.053 0	0.000 3	268.3	2.5	274.5	2.5	327.6	13.9
PM33Z14	124	262	0.041 5	0.000 3	0.30	0.004 6	0.053 0	0.000 8	261.9	2.0	268.7	4.1	328.0	32.7
PM33Z15	148	467	0.041 9	0.000 3	0.30	0.003 3	0.052 7	0.000 5	264.4	2.2	269.8	2.9	316.6	19.6
PM33Z16	628	865	0.042 0	0.000 4	0.29	0.002 0	0.050 4	0.000 3	265.3	2.2	260.3	1.8	215.6	12.1
PM33Z17	313	429	0.041 4	0.000 3	0.32	0.003 4	0.055 4	0.000 6	261.5	2.1	278.9	3	426.9	24.2
PM33Z18	360	570	0.040 7	0.000 3	0.33	0.003 3	0.058 7	0.000 5	256.9	1.9	289.0	2.9	557.2	20.1
PM33Z19	411	512	0.042 5	0.000 4	0.31	0.003 4	0.053 2	0.000 4	268.3	2.6	275.4	3	336.6	17.7
PM33Z20	729	983	0.041 2	0.000 3	0.30	0.002 4	0.053 3	0.000 3	260.6	2.0	269.0	2.1	343.3	12.3
PM33Z21	543	485	0.041 5	0.000 3	0.29	0.002 8	0.050 8	0.000 4	262.0	2.2	258.9	2.5	230.5	18.7
PM33Z22	164	222	0.041 4	0.000 3	0.43	0.007 1	0.075 3	0.001 2	261.6	2.0	363.2	6	1076.7	32.6
PM33Z23	172	191	0.045 5	0.000 4	0.32	0.002 7	0.050 2	0.000 4	286.8	2.8	278.2	2.4	205.8	17.6
PM33Z24	168	303	0.042 4	0.000 3	0.31	0.004 2	0.053 7	0.000 7	267.6	2.1	277.3	3.7	360.1	28.2
PM33Z25	242	408	0.043 1	0.000 4	0.32	0.003 9	0.052 6	0.000 6	272.2	2.2	280.9	3.4	312.5	25.7
PM33Z26	536	572	0.042 8	0.000 3	0.33	0.002 9	0.055 6	0.000 5	270.0	2.2	287.9	2.5	435.5
PM33Z27	1826	131 8	0.040 5	0.000 4	0.29	0.003 0	0.052 3	0.000 3	255.7	2.4	259.7	2.7	296.5	13.0
PM33Z28	348	342	0.041 9	0.000 3	0.40	0.005 1	0.069 6	0.000 7	264.3	2.1	342.7	4.3	915.4	348

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表 2 扭只二长花岗斑岩主量元素(%)和微量元素(10^-6)分析数据

Table 2 Major (%) and trace element (10-6) compositions of the Niuzhi monzogranite porphyry

样品号	PM3301	PM3300	PM3304	PM3305	PM3306	PM3307	PM3308	PM3310	PM3310	PM3312
样品号	H1	2H1	H1	H1	H1	H1	H1	H1	H2	H1
SiO₂	52.7	72	51.56	71.60	70.96	69.54	70.6	70.98	71.40	70.16
AI₂O₃	19.60	15.10	18.70	15.05	15.10	14.85	15.30	15.10	14.90	14.85
Fe₂O₃	3.39	1.17	6.21	1.63	2.10	0.26	1.27	2.06	1.38	0.59
FeO	4.69	1.19	5.14	1.34	0.89	2.31	1.71	0.89	1.42	2.16
P₂O₅	0.063	0.090	0.161	0.112	0.083	0.087	0.088	0.059	0.054	0.085
K₂O	0.26	2.19	0.68	1.45	1.87	1.44	1.89	1.75	1.39	1.39
Na₂O	2.18	3.54	4.22	5.09	4.07	5.91	5.23	4.66	4.71	5.47
MgO	2.67	0.76	3.06	0.71	0.69	0.77	0.79	0.67	0.63	0.9
CaO	8.93	0.32	3.34	0.38	0.19	1.49	0.39	0.36	0.09	1.54
TiO₂	0.66	0.40	1.59	0.39	0.40	0.39	0.40	0.41	0.40	0.39
MnO	0.152	0.051	0.156	0.077	0.048	0.078	0.082	0.057	0.045	0.099
Lol	4.95	2.73	5.67	2.07	2.76	2.56	2.23	2.39	2.67	2.54
总量	100.24	99.54	100.48	99.90	99.16	99.69	99.98	99.38	99.08	100.18
Q	13.25	42.23	9.97	34.90	39.61	24.66	31.16	35.96	38.37	27.91
An	45.11	1.03	16.41	1.18	0.42	7.03	1.39	1.45	0.10	7.26
Ab	19.38	0.95	37.76	44.05	35.76	51.49	45.27	40.69	41.35	47.41
Or	1.61	13.37	4.25	8.76	11.48	8.76	11.43	10.67	8.52	8.41
C	0	6.76	5.64	4.79	6.47	1.10	4.25	5.19	5.82	1.79
Di	0.84	0	0	0	0	0	0	0	0	0
Hy	15.06	3.29	16.69	3.52	3.56	5.60	3.64	3.37	3.26	5.38
Il	1.31	0.79	3.19	0.75	0.78	0.77	0.78	0.79	0.78	0.77
Mt	3.28	1.36	5.70	1.78	1.72	0.39	1.88	1.74	1.66	0.88
Ap	0.15	0.22	0.39	0.27	0.20	0.21	0.21	0.14	0.13	0.20
DI	34.24	86.55	51.98	87.71	86.85	84.91	87.86	87.32	88.24	83.73
SI	20.43	8.61	16.05	6.98	7.24	7.20	7.25	6.74	6.63	8.56
AR	1.19	2.18	1.57	2.47	2.27	2.64	2.66	2.42	2.37	2.44
σ	0.53	1.12	2.33	0.48	1.40	2.00	0.82	1.45	0.29	11.00
NK	2.44	5.73	4.90	6.54	5.94	7.35	7.12	6.41	6.10	6.86
A/CNK	0.975	1.721	1.360	1.415	1.666	0.061	1.347	1.478	1.582	1.116
Sc	20.86	7.35	31.25	8.46	7.57	8.04	7.98	8.02	7.03	8.34
Cr	12.49	3.42	4.32	4.43	3.62	6.68	2.78	7.90	2.98	2.33
Co	19.11	1.54	24.33	2.74	3.18	4.22	3.04	3.47	3.69	3.32
Ni	7.07	0.13	2.82	0.65	0.31	4.18	3.04	3.47	3.69	3.32
Zn	51.26	30.49	82.03	45.61	52.09	99.99	63.48	47.77	25.92	51.31
Rb	11.80	65.79	27.32	48.37	51.63	37.87	44.62	51.97	33.46	40.82
Sr	226.70	106.10	220.50	119.90	82.77	208.90	191.20	152.40	74.83	208.30
Cs	1.99	4.58	5.20	2.58	3.97	1.34	1.61	3.96	1.97	1.88
Ba	82.79	544.5	216.8	259.6	289.4	504.0	597.0	456.7	273.4	352.4
Zr	54.35	196.3	124.6	192.4	191.8	193.1	199.1	196.7	192.5	191.1
Ta	0.10	0.54	0.33	0.55	0.54	0.53	0.54	0.56	0.53	0.53
Th	1.29	6.95	2.83	6.83	6.82	6.85	7.18	7.21	6.66	6.95
U	0.35	1.63	0.69	1.60	1.61	1.64	1.69	1.68	1.57	1.60
Hf	1.59	4.68	3.29	4.72	4.64	4.73	4.88	5.12	4.69	4.94
Mo	0.60	2.51	0.77	1.43	0.90	0.70	0.46	0.47	0.70	0.87
W	0.17	0.42	0.68	0.52	0.48	0.45	0.51	0.48	0.29	0.48
Sn	1.26	0.99	3.14	1.46	1.50	2.24	1.02	2.44	1.38	2.99
As	4.61	71.34	14.62	20.94	11.38	10.57	30.74	11.00	6.45	4.02
Sb	0.20	0.71	3.05	0.26	0.42	0.28	0.30	0.27	0.24	0.23
Ag	0.044	0.066	0.094	0.042	0.045	0.042	0.055	0.041	0.068	0.042
Au	0.30	0.30	0.74	0.34	0.30	0.30	0.40	0.30	0.30	0.32
Cu	42.03	5.44	46.76	4.28	4.50	5.76	4.12	4.31	2.46	5.55

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表 3 扭只二长花岗斑岩稀土元素丰度(10^-6)及主要参数

Table 3 REE analyses of the Niuzhi monzogranite porphyry (10^-6)

样品号	PM330	PM3302	PM3304	PM3305	PM3306	PM3307	PM3308	PM3310	PM3310	PM3312
样品号	1H1	H1	H1	H1	H1	H1	H1	H1	H2	H1
La	5.21	20.78	11.84	22.04	23.37	19.54	21.41	22.13	18.97	21.14
Ce	10.77	34	24.43	41.02	36.78	36.59	37.69	37.22	32.74	36.61
Pr	1.46	4.20	3.47	4.29	5.33	4.07	4.60	4.48	4.11	4.35
Nd	6.72	14.94	15.19	14.96	20.53	14.12	17.04	16.38	15.06	15.61
Sm	1.94	3.11	4.23	3.06	4.71	3.2	3.84	3.52	3.07	3.33
Eu	0.6	0.89	1.44	1.08	1.16	0.81	0.98	0.97	0.73	0.88
Gd	2.23	3.06	4.49	3.13	4.74	3.09	3.55	3.35	2.89	3.44
Tb	0.43	0.53	0.88	0.49	0.78	0.56	0.66	0.59	0.49	0.58
Dy	2.74	3.51	5.69	3.19	4.92	3.61	4.16	3.93	3.14	3.95
Ho	0.58	0.75	1.15	0.68	0.98	0.78	0.87	0.83	0.67	0.82
Er	1.69	2.33	3.46	2.11	3.0	2.39	2.60	2.50	2.10	2.48
Tm	0.28	0.39	0.55	0.37	0.47	0.41	0.45	0.43	0.37	0.43
Yb	1.77	2.62	3.33	2.52	3.08	2.63	2.87	2.82	2.48	2.75
Lu	0.29	0.47	0.54	0.43	0.55	0.47	0.51	0.52	0.47	0.49
Y	16.79	21.38	32.2	21.48	27.39	21.62	24.01	23.16	17.75	23.6
ΣREE	36.7	91.56	80.7	99.38	110.38	92.28	101.23	99.69	87.29	96.85
LREE	26.7	77.91	60.61	86.45	91.86	78.33	85.56	84.71	74.68	81.92
HREE	10.0	13.66	20.09	12.92	18.52	13.95	15.67	14.98	12.61	14.92
LREE/HREE	2.67	5.71	3.02	6.69	4.96	5.62	5.46	5.65	5.92	5.49
La_N/Yb_N	2.11	5.69	2.55	6.27	5.44	5.32	5.35	5.63	5.48	5.52
δ5Eu	0.87	0.87	1.00	1.06	0.74	0.78	0.80	0.85	0.74	0.79
δ5Ce	0.94	0.84	0.92	0.97	0.78	0.95	0.89	0.87	0.87	0.89

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