北阿尔金南华纪双峰式火山岩的发现及构造意义

刘函; 王国灿; 曹树钊; 罗彦军; 高睿; 黄文星

doi:10.3799/dqkx.2012.100

北阿尔金南华纪双峰式火山岩的发现及构造意义

doi: 10.3799/dqkx.2012.100

刘函^{1, 2,},
王国灿^1, ,,
曹树钊¹,
罗彦军¹,
高睿¹,
黄文星¹

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
成都地质调查中心, 四川成都 610081

基金项目:

中国地质调查局项目 1212011121261

中国地质调查局项目 1212010610103

详细信息

作者简介:
刘函(1986-), 男, 硕士, 构造地质学专业, 主要从事青藏高原及造山带地质学方面工作.E-mail: liuhan_cug@163.com

通讯作者:
王国灿, E-mail: wgcan@cug.edu.cn

中图分类号: P541
计量
- 文章访问数: 215
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- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2011-10-12
- 网络出版日期: 2021-11-10
- 刊出日期: 2012-09-15

Discovery of Nanhuaian Bimodal Volcanics in Northern Altyn Tagh and Its Tectonic Significance

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Chengdu Center of China Geological Survey, Chengdu 610081, China

摘要

摘要: 北阿尔金恰什坎萨伊沟南口火山岩显双峰式特征, 由变玄武岩和变流纹岩组成.地球化学分析表明变玄武岩源自富集地幔, 上侵过程中遭受地壳混染, 形成于大陆裂谷环境; 而变流纹岩与铝质A型花岗岩特征类似, 为幔源岩浆底侵下地壳部分熔融成因.变流纹岩锆石LA-ICP-MS U-Pb年龄为749.8±4.6 Ma, 代表火山岩的喷发年龄, 为北阿尔金洋的初始裂解事件提供了时代证据; 与北祁连洋初始裂解时代相近, 从洋盆的初始裂解时间证明北阿尔金与北祁连同为一个带."西域板块"新元古代中期岩浆活动与Rodinia超大陆裂解事件密切相关, 与扬子板块周缘岩浆活动有相似性, 可划分为裂解初期与峰期两个阶段.所发现北阿尔金南华纪双峰式火山岩正是Rodinia超大陆裂解峰期岩浆活动的产物.
- 双峰式火山岩 /
- 大陆裂解 /
- 地球化学 /
- 地质年代学 /
- 北阿尔金
Abstract: The early Paleozoic ophiolite section of Qiashikansayi hollow is located at the segment of Hongliuguo-Lapeiquan ophiolite belt in the North Altyn Tagh Mountains, striking from south to north. The volcanics from the south entrance of the hollow consist of meta-basalts and meta-rhyolites, with typical "double peaks". The geochemistry data show that meta-basalts derived from enriched mantle have suffered from contamination of crust, and were formed in a continental rift setting; Meta- rhyolites are similar to the A-type granite in the composition, resulted from the partial melt of lower crust due to the underplating of mantle-derived magma. Zircon LA-ICP-MS dating of rhyolite yields a U-Pb age of 749.8±4.6 Ma, representing the time of crystallization of the bimodal volcanics, and providing time evidence for the initial breakup of North Altyn Ocean together with the published regional geological reports. There are similar time of initial breakup between North Altyn Ocean and North Qilian Ocean. We suggest that this volcanic action is closely related with the breakup of Rodinia supercontinent.
- bimodal volcanics /
- continental rift /
- geochemistry /
- geochronology /
- northern Altyn Tagh

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图 1 研究区地质简图(据1∶20万巴什考贡幅地质图修编)

Ⅰ.准葛尔-吐哈陆块；Ⅱ.伊利陆块；Ⅲ.塔里木陆块；Ⅳ.阿中陆块；Ⅴ.敦煌陆块；Ⅵ.巴颜喀拉山陆块；Ⅶ.柴达木陆块；Ⅷ.祁连陆块；Ⅸ.阿拉善陆块；NAS.北阿尔金蛇绿混杂岩带；SAS.南阿尔金蛇绿混杂岩带；NQCS.柴北缘蛇绿混杂岩带；NQLS.北祁连蛇绿混杂岩带

Fig. 1. Region geological map for this study area

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图 2 恰什坎萨伊沟双峰式火山岩剖面及采样点

Fig. 2. Geological section of Qiashikansayi bimodal volcanic rocks and samples locations

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图 3 样品TR051-3-2锆石阴极发光图像与LA-ICP-MS U-Pb年龄协和图

Fig. 3. CL images and LA-ICP-MS U-Pb Concordia diagram of zircons from Sample TR051-3-2

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图 4 恰什坎萨伊沟南华纪火山岩Nb/Y-Zr/TiO₂分类图解(底图据Winchester and Floyd, 1977)

Fig. 4. Diagram of Nb/Y-Zr/TiO₂ of bimodal volcanic rocks from Qiashikansayi

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图 5 恰什坎萨伊沟双峰式火山岩稀土元素分配形式图与微量元素蛛网图

a、b为流纹岩，c、d为玄武岩；OYC-563(Yellowstone)和98-183(Ethopia)流纹岩数据引自Hildreth et al.(1991)和Ayalew and Yirgu(2003)；196(Ethopia)玄武岩数据引自Kieffer et al.(2004)；球粒陨石、原始地幔数据引自Sun and McDonough(1989)

Fig. 5. Primitive mantle normalized trace elements pattern and chondrite normalized rare earth elements pattern for bimodal volcanic rocks

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图 6 玄武岩Ta/Yb-Th/Yb图解(底图据夏林圻等，2007)

Fig. 6. Diagram of Th/Yb-Ta/Yb for basalts

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图 7 恰什坎萨伊沟双峰式火山岩构造判别图解(底图据夏林圻等，2007；Förster et al., 1997)

Fig. 7. Diagram of Zr-Zr/Y (a) for basalts and Rb-(Y+Nb) (b) for rhyolites

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表 1 恰什坎萨伊沟变流纹岩(TR051-3-2)锆石LA-ICP-MS U-Pb定年结果

Table 1. Zircon LA-ICP-MS U-P isotopic dates of metarhyolite (TR051-3-2) at the Qiashikansayi

Spot	Th(10^-6)	U(10^-6)	²³²Th/²³⁸U	²⁰⁷Pb/²⁰⁶Pb	err 1σ	²⁰⁷Pb/²³⁵U	err 1σ	²⁰⁶Pb/²³⁸U	err 1σ	²⁰⁶Pb/²³⁸U (Ma)	err 1σ
1	95	174	0.50	0.071 1	0.28	1.208 5	4.72	0.123 4	0.16	750	9
2	65	129	0.45	0.067 2	0.28	1.128 3	4.51	0.122 6	0.19	746	11
3	112	171	0.59	0.070 5	0.25	1.189 7	4.12	0.122 5	0.15	745	9
4	110	183	0.53	0.067 2	0.23	1.142 2	4.06	0.123 0	0.17	748	10
5	402	390	0.92	0.062 8	0.17	1.072 8	2.99	0.123 2	0.14	749	8
6	79	151	0.49	0.066 2	0.26	1.133 5	4.43	0.124 1	0.15	754	9
7	82	171	0.44	0.067 8	0.26	1.140 0	4.18	0.122 8	0.15	747	9
8	111	42	2.38	0.106 7	0.85	0.613 3	4.86	0.044 5	0.14	280	8
9	69	142	0.44	0.067 3	0.26	1.134 3	4.12	0.123 0	0.16	748	9
10	125	203	0.52	0.063 0	0.22	1.104 7	4.01	0.127 0	0.17	771	10
11	75	153	0.42	0.062 3	0.28	1.053 2	4.66	0.122 8	0.17	747	10
12	102	169	0.55	0.065 7	0.23	1.178 5	4.18	0.129 6	0.16	786	9
13	92	165	0.51	0.060 8	0.25	1.049 8	4.16	0.125 0	0.15	759	9
14	62	118	0.52	0.061 7	0.27	1.137 3	5.23	0.122 7	0.18	746	10
15	39	99	0.35	0.067 9	0.34	1.130 7	5.48	0.122 0	0.21	742	12
16	141	206	0.59	0.072 0	0.39	1.239 8	6.42	0.125 0	0.18	759	10
17	87	158	0.50	0.136 8	7.05	2.350 6	121.60	0.124 3	0.14	755	8
18	125	227	0.49	0.062 9	0.22	1.085 7	3.77	0.124 6	0.15	757	9
19	195	262	0.61	0.065 9	0.26	1.098 4	4.30	0.120 3	0.14	732	8
20	73	132	0.49	0.064 9	0.30	1.111 0	4.96	0.123 7	0.17	752	10

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表 2 恰什坎萨伊沟双峰式火山岩主量(%)及微量元素(10^-6)分析结果

Table 2. Chemical compositions of bimodal volcanic rocks at the Qiashikansayi

样品	TR051-2-2	TR051-2-3	TR051-5-1	TR051-3-2	TR051-4-1
岩性	玄武岩	玄武岩	玄武岩	流纹岩	流纹岩
SiO₂	49.96	51.11	52.62	75.46	77.88
TiO₂	0.7	1.91	2.28	0.24	0.17
Al₂O₃	15.35	12.73	11.23	12.45	10.97
Fe₂O₃	10.26	16.24	18.13	1.37	2.12
MnO	0.19	0.16	0.14	0.02	0.01
MgO	6.67	4.73	3.27	0.67	0.24
CaO	5.95	5.08	3.93	0.91	0.35
Na₂O	3.3	2.85	2.93	2.51	0.16
K₂O	3.96	2.06	1.47	4.05	6.11
P₂O₅	0.06	0.16	0.22	0.03	0.02
LOI	3.34	2.73	3.62	1.89	1.59
Total	99.74	99.78	99.86	99.59	99.61
Mg^#	57	37	27	49	18
Ba	1004	449	285	1259	1798
Rb	105	71.61	58.03	126	162
Sr	361	145	93.92	54.82	61.6
Y	23.15	42.86	46.82	57.49	51.7
Zr	85.62	166	183	495	366
Nb	12.99	10.42	14.79	45.19	58.14
Th	3.13	6.56	5.54	12.89	15.08
Ga	18.86	19.56	20.64	18.86	17.24
Ni	76.1	18.35	12.33	2.95	10.37
Hf	2.3	4.37	4.86	12.35	9.85
Ta	0.53	0.78	0.95	3.16	4.19
U	0.94	1.68	1.79	2.19	2.07
La	13.04	17.11	21.23	63.5	58.68
Ce	26.97	39.69	46.46	128	120
Pr	3.21	5.27	6.06	15.89	15.3
Nd	12.57	22.18	25.43	59.53	58.44
Sm	2.97	5.72	6.44	10.91	11.63
Eu	0.74	1.59	1.88	2.22	2.6
Gd	3.26	6.62	7.6	9.58	10.16
Tb	0.54	1.08	1.21	1.41	1.53
Dy	3.72	7.35	7.87	9.41	9.48
Ho	0.86	1.63	1.76	2.12	2.02
Er	2.47	4.34	4.99	5.96	5.62
Tm	0.38	0.67	0.74	0.93	0.86
Yb	2.54	4.36	4.89	6.27	5.69
Lu	0.41	0.69	0.77	1	0.9
注：Mg^# =[Mg²⁺/(Mg²⁺+Fe²⁺(total))]×100.

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