东准库布苏南岩体和包体的LA-ICP-MS锆石U-Pb测年及地质意义

杨高学; 李永军; 司国辉; 吴宏恩; 张永智; 金朝

doi:10.3799/dqkx.2010.075

东准库布苏南岩体和包体的LA-ICP-MS锆石U-Pb测年及地质意义

doi: 10.3799/dqkx.2010.075

1.
长安大学地球科学与资源学院, 西部矿产资源与地质工程教育部重点实验室, 陕西西安 710054
2.
新疆维吾尔族自治区有色地质矿产勘查院, 新疆乌鲁木齐 830000

基金项目:

中国地质调查局地质大调查项目 QD200508

详细信息

作者简介:
杨高学(1980-), 男, 在读博士, 主要从事区域地质调查等方面研究.E-mail: mllygx@126.com

中图分类号: P591
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出版历程
- 收稿日期: 2009-06-05
- 刊出日期: 2010-07-01

LA-ICP-MS Zircon U-Pb Dating of Kubusunan Granodiorite and the Enclaves from Kalamaili Area in Eastern Junggar, Xinjiang, and Its Geological Implications

1.
School of Earth Sciences & Resources, Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, China
2.
Xinjiang Institute of Geological Exploration for Non-ferrous Resources, Urumqi 830000, China

摘要

摘要: LA-ICP-MS锆石U-Pb测年结果显示, 库布苏南花岗闪长岩形成时代为287±2 Ma, MSWD=0.15, 包体年龄为286±3 Ma, MSWD=0.22, 在误差范围内完全一致, 这就排除了暗色包体是来源于深部变质岩熔融残留体或浅部围岩捕虏体的可能性, 同时也排除了基性岩浆在花岗质岩浆固结后才侵入的可能, 为岩浆混合作用的存在提供最有力的证据.地球化学研究表明, 包体富集基性组分Ti、Zr、Nb、Hf等高场强元素以及稀土元素, 包体表现为与寄主岩石既相互联系又受其制约, 库布苏南花岗闪长岩体具有低⁸⁷Sr/⁸⁶Sr初始比值和高正ε_Nd(t)值, 表明花岗岩的来源有地幔物质参与, 包体是过冷的镁铁质岩浆混入到中酸性岩浆中经快速冷凝的结果.库布苏南花岗闪长岩形成的时代略晚于东准噶尔乌伦古河碱性花岗岩和卡拉麦里碱性花岗岩的形成时代(300 Ma左右), 均为准噶尔周边地区后碰撞伸展构造背景下岩浆活动的产物, 其形成和演化标志了准噶尔地区后碰撞幔源岩浆底侵作用导致大陆地壳垂向生长的过程.
- LA-ICP-MS锆石U-Pb测年 /
- 岩浆混合作用 /
- 闪长质包体 /
- 地球化学 /
- 地质年代 /
- 东准噶尔
Abstract: LA-ICP-MS zircon U-Pb dating of the Kubusunan granodiorite and its enclaves in the Kalamaili area of the eastern Junggar indicates that the isotopic age of the granodiorite is 287±2 Ma (MSWD=0.15), and that of its enclaves is 286±3 Ma (MSWD=0.22). The fact that they are the same in error range, showing that granodiorite and enclaves were formed at the same age, ruling out the possibility that the dark microgranule enclaves came from the solid metamorphic rock melt remaining in deep crust, or xenoliths from wall rock in the upper crust, at the same time, ruling out the possibility that the basic magma invaded solidified ganite magma. It presents strong evidence for the crust and mantle magma hybrid. Petrological and geochemical studies reveal the relationship between the enclaves and the host rock and it is found that they are related and restricted with each other. The enclaves are rich in basic ingredients HFSE(such as Ti, Zr, Nb and Hf) and REE, Kubusunan granodiorite characteristics of low ⁸⁷Sr/⁸⁶Sr initial values and high ε_Nd(t) values, indicating that granites originated partly from mantle magma. The large number of microgranular dioritic enclaves is direct evidence of crust-mantle magma hybrid. Kubusunan granodiorite was formed later than the Ulungur river and Kalamaili alkali granite (300 Ma±) resulting from post-collision magma activity surrounding eastern Junggar, whose formation and evolution stands for continental crust growth caused by post-collision magma underplating in eastern Junggar.
- LA-ICP-MS zircon U-Pb dating /
- hybrid origin /
- dioritic microgranular enclaves /
- geochemistry /
- geochronology /
- eastern Junggar

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图 1 卡拉麦里构造带库布苏南岩体分布

1.第四系；2.侏罗系；3.石炭系姜巴斯套组；4.石炭系黑山头组；5.花岗闪长岩；6.碱长花岗岩；7.花岗岩带；8.超动接触关系；9.脉动接触关系；10.侵入接触；11.断裂及编号；12.构造带；13.样品位置及同位素年龄；14.构造区带界线；15.国界；Ⅰ₁.阿尔泰构造带；Ⅰ₂.阿尔曼太构造带；Ⅱ₁.卡拉麦里构造带；Ⅱ₂.准噶尔盆地；Ⅱ₃.将军庙构造带；①额尔齐斯断裂；②阿尔曼太断裂；③卡拉麦里断裂

Fig. 1. Geological sketch of Kubusunan intrusion in Kalamaili tectonic belt, eastern Junggar

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图 2 花岗闪长岩(Ⅳ25-1)和微细粒包体(Ⅳ25-2)中典型锆石的CL图象和年龄值

圈表示U-Pb分析点位置，左上角数字表示点号，右下角数字表示²⁰⁶Pb/²³⁸U表面年龄

Fig. 2. Representative zircon CL images and ages of the granodiorite (Ⅳ25-1) and the microgranular enclave (Ⅳ25-2)

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图 3 花岗闪长岩(Ⅳ25-1)和微细粒包体(Ⅳ25-2)LA-ICP-MS锆石U-Pb年龄谐和图(a, c)和直方图(b, d)

Fig. 3. LA-ICP-MS zircon U-Pb concordia diagrams (a, c) and histograms of weighted average ages (b, d) of the granodiorite (Ⅳ25-1) and microgranular enclave (Ⅳ25-2)

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图 4 库布苏南岩体及包体QAP图解

Q.石英；A.碱性长石；P.斜长石；1a.石英岩；1b.富石英花岗岩；2.碱长花岗岩；3a.正长花岗岩；3b.二长花岗岩；4.花岗闪长岩；5.石英闪长岩(斜长花岗岩、奥长花岗岩)；6.碱长正长岩；6^*.石英碱长正长岩；7^*.石英正长岩；7.正长岩；8^*.石英二长岩；8.二长岩；9.二长闪长岩/二长辉长岩；9^*.石英二长闪长岩/石英二长辉长岩；10.闪长岩/辉长岩/斜长岩；10^*.石英闪长岩/石英辉长岩/石英斜长岩

Fig. 4. Q-A-P diagram of microgranular enclaves and host rock of the Kubusunan

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图 5 库布苏南岩体及包体A/NK-A/CNK图解

Fig. 5. A/CNK-A/NK diagram of microgranular enclaves and host rock of the Kubusunan

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图 6 包体和寄主花岗岩原始地幔标准化蛛网图(a)和稀土元素球粒陨石标准化图解(b)

原始地幔标准值引自Sun and McDonough(1989)；球粒陨石标准化值来自Taylor and McLennan(1985)

Fig. 6. Primitive-mantle normalized spidergrams (a) and chondrite-normalized REE patterns (b) of the enclaves and host rock of the Kubusunan, Kalamaili area in eastern Junggar

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图 7 微细粒包体中钾长石冷凝边和针-柱状磷灰石

Fig. 7. Potassium feldspar metasomatic ring and needle-cylindrical apatite in microgranular enclaves, Kalamaili area of the eastern Junggar

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表 1 库布苏南花岗闪长岩(Ⅳ25-1)和包体(Ⅳ25-2)LA-ICP-MS锆石U-Pb同位素分析结果

Table 1. LA-ICP-MS zircon U-Pb isotopic analysis of the Kubusunan granodiorite (Ⅳ25-1) and the microgranular enclave (Ⅳ25-2)

样品编号	同位素比值								同位素年龄(Ma)								同位素含量(μg/g)			Th/U
	²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		Pb^*	Th	U
	比值	1σ	比值	1σ	比值	1σ	比值	1σ	年龄	1σ	年龄	1σ	年龄	1σ	年龄	1σ	Pb^*	Th	U
Ⅳ25-1-01	0.059 6	0.001 0	0.371 4	0.005 7	0.045 2	0.000 4	0.013 8	0.000 2	591	20	321	4	285	2	277	3	16.3	120.9	262.4	0.5
Ⅳ25-1-02	0.063 8	0.000 9	0.341 3	0.004 2	0.038 8	0.000 3	0.012 0	0.000 1	736	14	298	3	245	2	241	2	23.0	197.4	410.8	0.5
Ⅳ25-1-03	0.053 3	0.000 8	0.338 6	0.004 1	0.046 0	0.000 3	0.013 2	0.000 1	343	15	296	3	290	2	265	2	14.7	89.7	297.9	0.3
Ⅳ25-1-04	0.058 2	0.001 2	0.381 8	0.007 0	0.047 6	0.000 4	0.014 7	0.000 1	538	45	328	5	300	2	296	2	23.1	218.3	337.9	0.7
Ⅳ25-1-05	0.071 8	0.002 0	0.411 6	0.010 8	0.041 6	0.000 4	0.012 6	0.000 1	980	58	350	8	263	2	253	2	24.5	202.5	346.6	0.6
Ⅳ25-1-06	0.056 5	0.001 4	0.340 3	0.008 0	0.043 7	0.000 4	0.013 2	0.000 2	471	36	297	6	276	2	265	4	15.9	25.1	69.1	0.4
Ⅳ25-1-07	0.056 6	0.001 3	0.354 6	0.007 7	0.045 4	0.000 4	0.015 8	0.000 2	475	33	308	6	286	2	316	4	14.7	111.9	232.2	0.5
Ⅳ25-1-08	0.055 3	0.001 0	0.329 1	0.005 4	0.043 2	0.000 3	0.013 2	0.000 2	423	23	289	4	272	2	266	3	20.5	234.5	255.5	0.9
Ⅳ25-1-09	0.053 5	0.001 3	0.320 0	0.007 5	0.043 4	0.000 4	0.013 6	0.000 1	351	57	282	6	274	2	273	2	14.7	103.5	261.2	0.4
Ⅳ25-1-10	0.058 9	0.000 9	0.394 4	0.005 2	0.048 6	0.000 4	0.016 4	0.000 2	563	16	338	4	306	2	329	3	16.3	132.8	281.7	0.5
Ⅳ25-1-11	0.064 5	0.001 0	0.389 1	0.005 3	0.043 8	0.000 3	0.017 0	0.000 2	757	16	334	4	276	2	341	3	28.0	219.4	431.1	0.5
Ⅳ25-1-12	0.055 7	0.001 4	0.371 6	0.009 1	0.048 4	0.000 4	0.015 1	0.000 1	441	59	321	7	304	2	302	2	16.9	27.3	74.4	0.4
Ⅳ25-1-13	0.059 6	0.001 1	0.423 7	0.006 9	0.051 6	0.000 4	0.011 9	0.000 1	588	22	359	5	324	3	238	2	18.1	104.2	252.1	0.4
Ⅳ25-1-14	0.054 5	0.001 0	0.396 8	0.006 6	0.052 8	0.000 4	0.016 8	0.000 2	390	23	339	5	332	3	337	4	33.5	272.1	558.2	0.5
Ⅳ25-1-15	0.060 7	0.000 9	0.439 9	0.005 8	0.052 6	0.000 4	0.019 1	0.000 2	627	16	370	4	330	2	383	4	17.4	141.8	272.0	0.5
Ⅳ25-1-17	0.053 7	0.001 0	0.355 1	0.006 2	0.048 0	0.000 4	0.015 1	0.000 2	358	25	309	5	302	2	303	3	17.5	111.2	265.9	0.4
Ⅳ25-1-18	0.070 9	0.000 8	0.421 8	0.003 9	0.043 2	0.000 3	0.021 7	0.000 2	953	9	357	3	272	2	435	3	18.1	120.6	264.8	0.5
Ⅳ25-1-19	0.053 8	0.000 7	0.355 1	0.004 0	0.047 9	0.000 4	0.015 8	0.000 1	361	13	309	3	302	2	317	3	16.3	120.9	262.4	0.5
Ⅳ25-1-20	0.053 5	0.000 8	0.378 5	0.005 0	0.051 3	0.000 4	0.016 1	0.000 2	351	17	326	4	322	2	322	3	23.0	197.4	410.8	0.5
Ⅳ25-2-01	0.067 9	0.001 0	0.472 3	0.006 2	0.050 4	0.000 4	0.016 1	0.000 1	740	56	372	8	315	3	308	2	15.0	24.2	64.6	0.4
Ⅳ25-2-03	0.075 6	0.001 2	0.479 4	0.006 7	0.046 0	0.000 4	0.011 9	0.000 1	1 085	16	398	5	290	2	239	2	35.3	372.2	494.9	0.8
Ⅳ25-2-04	0.153 3	0.001 8	0.934 7	0.008 3	0.044 2	0.000 3	0.023 6	0.000 2	462	99	267	15	245	2	242	2	36.3	392.7	575.7	0.7
Ⅳ25-2-06	0.059 7	0.000 7	0.396 8	0.003 9	0.048 2	0.000 4	0.012 0	0.000 1	592	10	339	3	304	2	241	2	64.5	882.7	950.3	0.9
Ⅳ25-2-07	0.054 9	0.000 7	0.409 7	0.004 1	0.054 1	0.000 4	0.015 2	0.000 1	408	11	349	3	340	2	304	2	27.0	224.4	427.5	0.5
Ⅳ25-2-08	0.054 0	0.000 7	0.332 1	0.003 6	0.044 6	0.000 3	0.011 9	0.000 1	373	12	291	3	281	2	239	2	15.5	24.5	66.9	0.4
Ⅳ25-2-09	0.124 0	0.001 6	0.919 4	0.009 5	0.053 8	0.000 4	0.018 5	0.000 1	1 654	47	557	10	328	3	305	2	24.3	227.7	381.3	0.6
Ⅳ25-2-10	0.200 3	0.002 6	1.257 6	0.013 2	0.045 5	0.000 4	0.033 0	0.000 3	1 007	98	327	20	240	3	230	4	46.1	511.3	598.3	0.9
Ⅳ25-2-13	0.122 9	0.001 5	0.810 9	0.008 0	0.047 9	0.000 4	0.020 4	0.000 1	1 228	60	416	10	285	2	271	2	32.4	223.8	488.7	0.5
Ⅳ25-2-14	0.051 0	0.000 9	0.360 8	0.006 0	0.051 3	0.000 4	0.012 8	0.000 1	243	24	313	4	322	3	257	3	15.1	23.6	65.1	0.4
Ⅳ25-2-16	0.049 2	0.000 7	0.318 5	0.003 8	0.047 0	0.000 4	0.012 3	0.000 1	155	14	281	3	296	2	246	2	17.3	24.4	69.9	0.4
Ⅳ25-2-17	0.053 1	0.000 7	0.335 9	0.003 6	0.045 8	0.000 3	0.011 4	0.000 1	335	12	294	3	289	2	230	1	109.8	2 303.1	1 568.1	1.5
Ⅳ25-2-18	0.101 4	0.001 1	0.547 3	0.004 5	0.039 1	0.000 3	0.010 0	0.000 1	1 649	7	443	3	247	2	201	1	59.0	562.9	711.3	0.8
Ⅳ25-2-19	0.047 2	0.000 5	0.304 3	0.002 9	0.046 7	0.000 3	0.011 5	0.000 1	59	11	270	2	294	2	231	1	19.1	159.6	277.3	0.6
Ⅳ25-2-20	0.052 6	0.000 6	0.361 2	0.003 3	0.049 8	0.000 4	0.012 5	0.000 1	310	10	313	2	313	2	251	2	76.9	1 211.5	1 172.5	1.0

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表 2 库布苏南岩体暗色微粒包体与寄主岩主量元素含量(%)及CIPW标准矿物含量(%)

Table 2. Major element compositions (%) and CIPW minerals of enclaves and host rock of the Kubusunan

序号	类型	样品	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失	总量
1	寄主岩	D386	68.55	0.48	14.85	0.38	3.20	0.06	1.26	2.57	3.87	3.57	0.11	0.69	99.59
2	寄主岩	Ⅳ-27-1	67.75	0.44	15.40	0.90	2.66	0.06	1.45	3.23	4.11	3.10	0.12	0.41	99.64
3	寄主岩	Ⅵ-40-1	67.34	0.30	16.69	0.11	2.78	0.04	0.91	2.98	4.19	3.31	0.06	0.90	99.61
4	寄主岩	Ⅳ-25-1	67.06	0.50	15.26	0.86	2.87	0.07	1.63	3.41	3.96	3.31	0.13	0.57	99.62
5	寄主岩	Ⅳ-23-1	64.24	0.59	16.38	0.72	3.56	0.07	1.90	3.90	4.36	2.67	0.14	1.00	99.53
6	包体	Ⅳ-25-2	61.43	0.79	16.91	0.86	4.25	0.09	2.63	4.61	4.22	2.21	0.22	1.22	99.44
7	包体	Ⅳ-23-2	55.85	0.89	16.95	1.62	5.18	0.17	4.23	6.00	5.18	1.66	0.23	1.44	99.41
8	包体	D388	55.13	0.86	16.92	2.73	4.55	0.15	4.75	7.11	4.38	1.88	0.16	0.81	99.43

序号	类型	样品	Q	Or		Ab	An	C		Hy	Mt	Il	Di		Ap
1	寄主岩	D386	23.34	21.35	33.07	12.22	0.18		8.12	0.56	0.91		0.00		0.25
2	寄主岩	Ⅳ-27-1	22.01	18.48	35.01	14.49	0.00		6.79	1.32	0.85		0.79		0.26
3	寄主岩	Ⅵ-40-1	20.91	19.83	35.88	14.65	0.91		6.97	0.16	0.57		0.00		0.16
4	寄主岩	Ⅳ-25-1	20.87	19.77	33.79	14.18	0.00		7.11	1.26	0.96		1.79		1.26
5	寄主岩	Ⅳ-23-1	16.06	16.03	37.4	17.45	0.00		9.43	1.06	1.13		1.12		1.06
6	包体	Ⅳ-25-2	12.93	13.31	36.31	21.03	0.00		12.37	1.27	1.52		0.78		0.50
7	包体	Ⅳ-23-2	0.00	10.02	44.69	18.44	0.00		13.13	2.40	1.73		8.66		0.50
8	包体	D388	1.21	11.28	37.54	21.21	0.00		11.79	4.01	1.65		10.96		0.35

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表 3 库布苏南岩体暗色微粒包体与寄主岩微量和稀土元素含量(μg/g)

Table 3. Trace and REE element compositions (μg/g) of enclaves and host rock of the Kubusunan

序号	类型	样品	Ba	Rb	Sr	Y	Zr	Nb	Th	Ga	Ni
1	寄主岩	D386	432.47	134.07	253.02	30.71	155.01	8.84	15.22	19.22	7.70
2	寄主岩	Ⅳ-27-1	406.23	102.40	349.30	17.94	149.31	7.31	12.41	17.21	9.18
3	寄主岩	Ⅵ-40-1	488.01	104.41	302.24	22.25	86.53	5.86	12.01	18.09	8.04
4	寄主岩	Ⅳ-25-1	416.04	108.07	326.31	20.13	112.04	7.86	8.76	19.23	11.21
5	寄主岩	Ⅳ-23-1	410.25	81.30	308.08	20.41	123.49	6.16	11.30	20.44	11.93
6	包体	Ⅳ-25-2	468.09	58.60	383.42	24.09	149.21	8.35	5.08	19.42	12.08
7	包体	Ⅳ-23-2	178.49	97.40	343.05	31.81	141.35	8.83	8.66	28.31	19.12
8	包体	D388	478.20	58.70	408.02	36.53	85.09	7.35	5.74	42.80	34.33

序号	类型	样品	Cr	Hf	Sc	Ta	Co	Li	Be	B	W
1	寄主岩	D386	38.52	5.08	7.82	1.79	8.31	42.31	3.08	12.92	1.20
2	寄主岩	Ⅳ-27-1	10.71	4.64	6.47	0.98	9.26	53.08	2.58	14.07	1.32
3	寄主岩	Ⅵ-40-1	15.42	3.00	4.38	0.51	6.12	31.51	2.73	13.83	1.56
4	寄主岩	Ⅳ-25-1	21.52	3.82	7.32	0.81	10.61	54.44	2.72	12.14	1.43
5	寄主岩	Ⅳ-23-1	48.13	4.31	8.68	0.53	11.82	27.32	2.60	18.43	1.10
6	包体	Ⅳ-25-2	26.23	4.32	10.71	1.22	15.31	54.71	2.20	13.61	1.02
7	包体	Ⅳ-23-2	46.81	4.20	19.82	0.70	22.60	39.82	3.84	28.83	3.22
8	包体	D388	87.72	2.45	21.33	0.65	25.31	27.5	1.55	23.21	0.34

序号	类型	样品	Sn	Mo	La	Ce	Pr	Nd	Sm	Eu	Gd
1	寄主岩	D386	18.02	0.85	23.81	48.91	6.46	23.60	5.16	0.95	5.34
2	寄主岩	Ⅳ-27-1	8.20	0.76	16.32	32.93	4.37	16.01	3.49	0.91	3.55
3	寄主岩	Ⅵ-40-1	11.03	1.23	18.91	38.82	4.95	17.62	3.97	1.15	4.03
4	寄主岩	Ⅳ-25-1	9.16	0.64	16.14	33.30	4.50	17.19	3.63	0.94	3.77
5	寄主岩	Ⅳ-23-1	10.50	0.86	16.43	35.61	4.83	17.92	3.86	1.11	3.90
6	包体	Ⅳ-25-2	5.60	0.72	17.83	37.41	5.22	20.81	4.74	1.34	4.57
7	包体	Ⅳ-23-2	22.03	0.66	20.01	49.84	7.67	29.14	6.17	1.04	6.05
8	包体	D388	14.01	0.10	20.22	52.90	6.88	29.13	6.74	2.21	6.73

序号	类型	样品	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑	δEu
1	寄主岩	D386	0.97	5.24	1.10	3.28	0.63	4.17	0.61	160.03	0.55
2	寄主岩	Ⅳ-27-1	0.60	3.08	0.65	1.95	0.36	2.48	0.37	104.43	0.78
3	寄主岩	Ⅵ-40-1	0.71	3.86	0.80	2.35	0.44	3.04	0.44	123.31	0.87
4	寄主岩	Ⅳ-25-1	0.66	3.46	0.71	2.17	0.41	2.83	0.41	110.09	0.77
5	寄主岩	Ⅳ-23-1	0.68	3.55	0.72	2.17	0.38	2.64	0.38	114.13	0.87
6	包体	Ⅳ-25-2	0.82	4.28	0.88	2.55	0.45	2.97	0.43	128.03	0.87
7	包体	Ⅳ-23-2	1.03	5.28	1.08	3.25	0.63	4.30	0.63	167.35	0.49
8	包体	D388	1.22	7.04	1.46	4.98	0.66	4.11	0.69	181.27	0.98

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