北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义

刘晓煌; 邓军; 孙兴丽; 刘玖芬; 孙柏年; 康洪杰

doi:10.3799/dqkx.2010.110

北祁连西段石鸡河地区火山岩地球化学特征及其动力学意义

doi: 10.3799/dqkx.2010.110

1.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083
2.
武警黄金第七支队, 山东烟台 264004
3.
兰州大学西部环境教育部重点实验室, 甘肃兰州 730000

基金项目:

高等学校学科创新引智计划资助 B07011

长江学者和创新团队发展计划资助 IRT0755

详细信息

作者简介:
刘晓煌(1972-), 男, 博士, 地质学专业, 主要从事矿产勘查和地球化学研究.E-mail: liuxh19972004@163.com

中图分类号: P597.3;P588.34
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出版历程
- 收稿日期: 2010-05-26
- 刊出日期: 2010-11-01

Geochemistry and Tectonic Setting of Lavas from Shijihe Area in Western North Qilian Mountains

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
No.7 Gold Geological Party, Yantai 264004, China
3.
Key Laboratory of Western China's Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

摘要

摘要: 石鸡河一带是近年新发现的北祁连山多金属成矿带, 气侯和自然条件恶劣, 研究程度很低.该区地层岩性为阳起石岩、角岩和细碧岩; 岩石地球化学和Nd同位素数据显示岩石来源于亏损地幔, 具有N-MORB洋脊玄武岩特征; Sr同位素特征显示地层Sr同位素组成的改变是蚀变引起, 而不是由地壳物质加入引起的.Sm-Nd等时线年龄为481±20 Ma.提出了石鸡河地区地层形成于早奥陶世, 成岩环境为北祁连洋扩张环境, 而非区域资料上显示的残留海盆封闭、大陆碰撞造山环境.
- 石鸡河 /
- 岩石地球化学 /
- Rb-Sr同位素 /
- Sm-Nd等时线年龄 /
- N-MORB洋脊玄武岩
Abstract: Recent studies showed that the Shijihe area is an important polymetallic metallogenic belt in western part of North Qilian Mountains in China. However, geological study degree is very low due to its remoteness and poor conditions. The Lavas of Shijihe area consists of actinolitite hornstone and spilite. The geochemical characteristics of metamorphic basic lava with flat REE distribution patterns, the contents of HFSE similar to N-MORB and ε_Nd(0)=+9.03~+9.42 (except the sample 08p1) manifest that the rocks belong to the tholeiitic basalt series. Sr isotope characteristics indicate that Sr isotopic composition of the rocks was altered because of the metamorphism of the rock instead of the interfused crust. Sm-Nd isochron age is 481±20 Ma. The metamorphic basic lavas of Shijihe area is residue of Early Ordovician. The diagenesis environment is oceanic ridge instead of continental collision with closing of ocean basin.
- Shijihe /
- geochemistry /
- Rb-Sr isotope /
- Sm-Nd isochron age /
- N-MORB ocean ridge basalt

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图 1 石鸡河地区地质示意图

1.泥盆-第三纪沉积；2.寒武-志留纪火山沉积；3.中新元古代裂谷沉积；4.古元古代北大河岩群；5.加里东金佛寺岩体；6.研究区范围；7.石炭纪泥岩、砂岩、页岩；8.石炭纪细砂岩、粉砂岩；9.志留纪硬砂岩；10.志留纪千枚岩；11.奥陶纪阳起石岩；12.奥陶纪细碧岩；13.奥陶纪角岩；14.加里东一期花岗岩；15.加里东二期花岗岩；16.断裂；17.矿脉及产状；18.取样位置

Fig. 1. Geological sketch map of the Shijihe area

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图 2 阳起绿帘石英角岩(a)、绿帘阳起石岩(b)和绢云母化细碧岩(c)薄片

单偏光10×5；Q.石英；Act.阳起石；Ep.绿帘石；Pl.钠长石

Fig. 2. Actinolitite-chloritization quartz hornstone (a), chloritization actinolitite (b) and sericitization spilite (c)

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图 3 石鸡河地区火山岩SiO₂-Nb/Y图解(a)和Zr/TiO₂×0.000 1-Nb/Y图解(b)

Fig. 3. Diagrams of SiO₂-Nb/Y (a) and Zr/TiO₂×0.000 1-Nb/Y (b)

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图 4 稀土元素球粒陨石标准化分布型式

Fig. 4. Chondrite-normalized rare earth element patterns of the metamorphic basic lava in the Shijihe area

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图 5 石鸡河地区火山岩Sm-Nd同位素等时线年龄

Fig. 5. Diagram of Sm-Nd isotopic isochron age of the metamorphic basic lava in the Shijihe area

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图 6 P₂O₅-TiO₂图解

ORB.洋脊拉斑玄武岩；OIB.洋岛拉斑玄武岩；ALB.碱性玄武岩区

Fig. 6. Map of P₂O₅-TiO₂

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表 1 石鸡河地区火山岩主量元素(%)、微量元素(μg/g)含量分析结果

Table 1. Geochemical composition of the metamorphic basic lava in the Shijihe area

项目	08p1	08p2	08p3	08p4	08p5	08p6	08p7	08p8	08p9	N-MORB	E-MORB	OIB
SiO₂	50.44	49.17	43.85	50.69	51.01	50.66	49.53	49.68	46.71
TiO₂	1.74	1.72	0.84	1.69	1.05	1.73	2.35	1.83	1.28
Al₂O₃	13.16	15.84	15.99	17.25	17.19	13.71	17.18	13.82	13.76
TFe₂O₃	14.67	13.94	11.13	14.82	13.94	12.25	17.54	13.19	12.34
MnO	0.17	0.24	0.23	0.22	0.27	0.23	0.12	0.21	0.17
MgO	3.82	5.64	5.41	3.25	3.77	7.31	1.38	6.92	5.66
CaO	4.25	7.38	17.15	7.17	6.94	8.99	3.03	9.14	15.24
Na₂O	1.51	4.15	1.04	2.75	3.9	3.36	5	3.42	2.5
K₂O	2.66	0.34	0.67	1.05	0.69	0.6	3.13	0.71	0.22
P₂O₅	0.19	0.17	0.11	0.16	0.16	0.16	0.22	0.17	0.12
LOI	7.84	1.62	3.26	0.87	1.06	1.22	0.69	1.15	1.76
La	42.1	3.14	2.46	4.51	8.28	3.17	4.97	3.38	2.15	2.5	6.3	37
Ce	87.4	9.87	5.71	9.09	17.2	10.7	13.2	11.5	7.26	7.5	15	80
Pr	9.26	1.93	1.42	2.03	2.62	2.06	2.67	2.18	1.52	1.32	2.05	9.7
Nd	36.2	10.5	7.25	11	12.3	11.3	14.8	12.1	8.09	7.3	9	38.5
Sm	6.97	3.76	2.52	3.88	3.43	3.98	5.26	4.3	3.07	2.63	2.6	10
Eu	1.38	1.42	0.91	1.5	1.16	1.36	1.76	1.4	1.13	1.02	0.91	3
Gd	5.88	4.97	3.23	5.15	4.19	5.23	6.81	5.56	4.11	3.68	2.97	7.62
Tb	0.89	0.94	0.6	0.98	0.75	0.99	1.26	1.05	0.79	0.67	0.53	1.05
Dy	5.1	6.31	3.92	6.4	4.83	6.63	8.56	7.04	5.37	4.55	3.55	5.6
Ho	1.03	1.41	0.87	1.39	1.07	1.5	1.9	1.58	1.21	1.05	0.79	2.62
Er	2.79	3.9	2.39	3.81	2.95	4.15	5.31	4.37	3.4	2.97	2.31	2.62
Tm	0.39	0.56	0.35	0.54	0.43	0.6	0.76	0.64	0.5	0.46	0.36	0.35
Yb	2.63	3.77	2.29	3.56	2.87	4.08	5.08	4.32	3.35	3.05	2.37	2.16
Lu	0.39	0.56	0.34	0.51	0.43	0.6	0.73	0.63	0.5	0.46	0.35	0.3
Y	28.7	36.6	23.6	35.2	28.4	40.1	49.6	42.4	33	28	22	29

项目	08p1	08p2	08p3	08p4	08p5	08p6	08p7	08p8	08p9	N-MORB	E-MORB	OIB
Sr	90.5	247	531	334	442	128	108	113	248	90	155	660
Rb	108	17.1	27.2	44	26.8	14	71	17.2	6.64	0.56	5.04	31
Ba	326	45.9	37.6	69.5	405	48.1	561	26.5	20.7	6.3	57	350
Cs	4.86	3.23	5.42	6.28	4.6	1.4	2.55	1.67	1.99	0.007	0.063	0.013
U	2.91	0.17	0.23	0.35	0.55	0.3	0.19	0.19	0.22	0.047	0.18	0.075
Th	12.8	0.3	0.33	0.23	2.53	0.28	0.38	0.28	0.23	0.12	0.6	4
Ta	1.13	0.12	0.08	0.09	0.23	0.11	0.09	0.11	0.06	0.13	0.843	3
Nb	13.3	1.84	1.16	1.44	3.15	1.68	1.48	1.83	1.16	2.33	8.3	48
Zr	202	107	53.8	99.2	94.4	115	138	120	76.6	74	73	280
Hf	4.98	2.77	1.59	2.68	2.48	2.92	3.65	3.07	2.08	2.05	3.4	7.8
Th/Yb	4.87	0.08	0.14	0.06	0.88	0.07	0.07	0.06	0.07	0.04	0.25	1.85
Th/Nb	0.96	0.16	0.28	0.16	0.8	0.17	0.26	0.15	0.2	0.05	0.07	0.08
Nb/La	0.32	0.59	0.47	0.32	0.38	0.53	0.3	0.54	0.54	0.93	1.32	1.3
Hf/Th	0.39	9.23	4.82	11.65	0.98	10.43	9.61	10.96	9.04	17.08	5.67	1.95
Ce/Nb	0.12	0.93	2.41	1.39	0.65	0.85	0.97	0.87	1.6	3.22	1.81	1.67
Ti/Y	363	282	213	288	222	259	284	259	232	271	273	593
La/Ta	37	26	32	53	36	29	58	31	34	19	7	12
Hf/Ta	4.41	23.08	20.65	31.53	10.78	26.55	42.94	27.91	32.5	15.77	4.03	2.6
Sm/Nd	0.19	0.36	0.35	0.35	0.28	0.35	0.36	0.36	0.38	0.36	0.29	0.26
∑REE	202.41	53.04	34.26	54.35	62.51	56.35	73.07	60.05	42.45	39.16	49.09	200.52
LREE/HREE	9.6	1.37	1.45	1.43	2.57	1.37	1.4	1.38	1.21	1.32	2.71	7.98
(La/Yb)_n	11.48	0.6	0.77	0.91	2.07	0.56	0.7	0.56	0.46	0.59	1.91	12.29
(La/Sm)_n	3.9	0.54	0.63	0.75	1.56	0.51	0.61	0.51	0.45	0.61	1.56	2.39
δEu	0.66	1	0.98	1.03	0.94	0.91	0.9	0.88	0.97	1	1	1.05
测试单位：西北大学大陆动力学国家重点实验室，2009.

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表 2 石鸡河地区火山岩Sr-Nd同位素测定值

Table 2. Sr-Nd isotopic analyses of the metamorphic basic lava in the Shijihe area

样号	08p1	08p2	08p3	08p4	08p5	08p6	08p7	08p8	08p9
Rb	112.62	10.04	35.59	22.99	64.67	4.62	63.94	8.78	9.02
Sr	90.20	245.00	528.00	332.00	435.00	130.00	110.00	100.00	243.00
⁸⁷Rb/⁸⁶Sr	3.609 9	3.609 9	0.118 2	0.194 4	0.1997	0.428 9	0.102 6	1.678 4	0.253 3
⁸⁷Sr/⁸⁶Sr	0.731 01	0.731 01	0.706 82	0.707 35	0.707 38	0.708 97	0.706 71	0.717 61	0.707 76
2s	14	14	14	16	23	16	21	18	20
Nd		10.321		11.211	12.122	11.463	13.501	12.030	8.050
Sm		1.761		3.860	4.509	4.248	5.091	4.548	3.146
¹⁴⁷Sm/¹⁴⁴Nd		0.228 7		0.208 3	0.103 2	0.228 1	0.225 1	0.224 1	0.236 3
¹⁴³Nd/¹⁴⁴Nd		0.513 121		0.513 055	0.512 723	0.513 118	0.513 101	0.513 108	0.513 141
2σ		17		13	15	13	15	13	18
Rb/Sr	1.25	0.04	0.07	0.07	0.15	0.04	0.58	0.09	0.04
Sm/Nd		0.17		0.34	0.37	0.37	0.38	0.38	0.39
ε_Sr(t)	34	30	30	30	30	30	31	30	29
ε_Nd(t)		7.5		7.4	7.4	7.5	7.3	7.5	7.4
ε_Sr(0)	376	33	40	41	64	31	186	46	32
ε_Nd(0)		9.4		8.1	1.7	9.4	9.0	9.2	9.8
测试单位：西北大学大陆动力学国家重点实验室，2009.Sr-Nd同位素测定时t=480 Ma；Rb、Sr、Nd和Sm单位为10^-6.

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