北祁连缝合带油葫芦沟玄武岩地球化学特征

李冰; 张耀玲; 王超群; 胡道功

北祁连缝合带油葫芦沟玄武岩地球化学特征

李冰^{1, 2,},
张耀玲¹,
王超群¹,
胡道功¹

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质科学院, 北京 100037

基金项目:

中国地质科学院基本科研业务费专项项目 YYWF201401

中国地质调查局"祁连山及邻区天然气水合物资源勘查(控矿因素综合研究及编图)"项目 GZHL20120301

详细信息

作者简介:
李冰(1987-), 男, 硕士研究生, 构造地质学专业。E-mail:libing@cags.ac.cn

中图分类号: P632
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出版历程
- 收稿日期: 2015-09-15
- 刊出日期: 2016-03-28

GEOCHEMICAL CHARACTERISTICS OF THE YOUHULUGOU BASALTS IN THE SUTURE ZONE OF THE NORTH QILIAN MOUNTAIN

1.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China
2.
Chinese Academy of Geological Science, Beijing 100037, China

摘要

摘要: 对油葫芦沟蛇绿岩中玄武岩进行了地球化学研究, 以探讨其形成环境。油葫芦沟蛇绿岩中玄武岩的主量和微量元素具有低钾富钠的特征, 属低钾(拉斑)系列。玄武岩的球粒陨石标准化稀土元素分配模式图表现为近平坦型, 轻重稀土富集不明显, 属于亏损地幔(N型)。大离子亲石元素(LILE)Rb、K和Sr出现负异常, 高场强元素(HFSE)Nb、Ta、Hf、Zr无负异常, 表现出大洋中脊幔源岩浆作用的特征。构造环境判别图显示, 油葫芦沟玄武岩属于典型的亏损型大洋中脊玄武岩(MORB)。研究结果表明油葫芦沟蛇绿岩中玄武岩为北祁连洋洋壳的组成部分, 北祁连洋在晚元古代—晚寒武世为典型的大洋中脊环境。
- 北祁连缝合带 /
- 油葫芦沟 /
- 玄武岩 /
- 地球化学 /
- 洋中脊
Abstract: Geochemical study for the basalt of Youhulugou ophiolite was carried out and discussed its genesis environment. Major and trace element in basalt is one of the representative ophiolite fragments in the suture zone of the North Qilian Mountain. In this study, geochemical study and indicates that the basalts from the Youhulugou ophiolite have N-MORB type characteristics. And according to the REE distribution patterns with no anomaly, the basalts are also similar to mid-ocean ridge basalt. Meanwhile, these basalts are generally depleted in large ion lithophile elements (LILE) of Rb、K and Sr, and high field strength elements (HFSE) are normal, indicating the characteristics of mantle-derived magma from mid oceanic ridge. Tectonic environment discrimination diagrams also suggest that these basalts are typical mid oceanic ridge basalts (MORB). Combined with regional geological characters and geochemical data, we conclude that the Youhulugou basalts represents a part of the dismembered North Qianlian oceanic crust of the era. And the tectonic setting of the North Qilian Ocean was mid-ocean ridge during the late Proterozoic to late Cambrian.
- North Qilian suture zone /
- Youhulugou basalts /
- geochemical characteristics /
- MOR /

HTML全文

图 1 北祁连主要蛇绿岩带分布及年龄图(据文献[16]修编)

蛇绿岩年龄: (1) 文献[17 ~ 19]; (2) 文献[16, 20]; (3) 文献[7]

Figure 1. Geological map of the North Qilian Orogen with localities of major ophiolite suites and their ages

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图 2 玄武岩岩石特征

Figure 2. photography of basalts

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图 3 玄武岩显微结构

Figure 3. Microstructure of basalt samples

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图 4 油葫芦沟地区玄武岩岩性判别图

a—(Na₂O+K₂O)-SiO₂分类图(原图据文献[21]；Pc—苦橄玄武岩；B—玄武岩；O1—玄武安山岩；O2—安山岩；O3—英安岩；R—流纹岩；S1—粗面玄武岩；S2—玄武质粗面安山岩；S3—粗面安山岩；T—粗面岩、粗面英安岩；F—副长石岩；U1—碱玄岩、碧玄岩；U2—响岩质碱玄岩；U3—碱玄质响岩；Ph—响岩；Ir—Irvine分界线，上方为碱性，下方为亚碱性)；b—K₂O-SiO₂分类图(实线据文献[22]，虚线据文献[23])

Figure 4. Discrimination diagrams of basalt in Youhulugou area

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图 5 油葫芦沟地区玄武岩类构造环境判别图

a—Zr/Y-Zr分类图(原图据文献[24])；b—TiO₂-Zr分类图(原图据文献[25])；c—P₂O₅-TiO₂分类图(原图据文献[26])；d—Th/Yb-Ta/Yb分类图(原图据文献[25])；IAB—岛弧玄武岩；IAT—岛弧拉斑系列；ICA—岛弧钙碱系列；SHO—岛弧橄榄玄粗岩系列；WPB—板内玄武岩；MORB—洋中脊玄武岩；TH—拉斑玄武岩；TR—过渡玄武岩；ALK—碱性玄武岩

Figure 5. Tectonic environment discrimination diagrams of basalts from Youhulugou area

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图 6 北祁连油葫芦沟玄武岩类稀土元素球粒陨石标准化配分模式图和微量元素原始地幔标准化多元素蛛网图(原图据文献[27~28])

Figure 6. Chondrite-normalized REE distribution patterns and primitive mantle-normalized trace element spider diagram of volcanic rocks in Youhulugou of North Qilian Orogen

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表 1 油葫芦沟玄武岩主量元素分析结果

Table 1. Major elements of basalts in Youhulugou area%

%
样品号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	CO₂	H₂O⁺	TOTAL
B063-1	48.32	1.50	13.09	5.82	5.34	0.15	5.05	7.08	4.63	0.03	0.14	5.14	3.34	99.63
B063-2	45.73	1.51	13.03	3.69	7.38	0.16	5.68	8.26	3.75	0.04	0.12	6.26	3.68	99.29
B063-3	46.07	1.38	12.06	5.21	5.35	0.17	4.11	9.90	4.39	0.02	0.13	7.20	3.30	99.29
B063-4	46.47	1.58	13.13	2.99	7.35	0.16	5.99	7.77	3.77	0.02	0.13	6.17	4.04	99.57
B063-6	47.64	1.77	15.10	5.89	6.41	0.14	6.25	5.06	4.61	0.14	0.15	2.49	3.88	99.53

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表 2 油葫芦沟玄武岩微量元素分析结果

Table 2. Trace elements of basalts in Youhulugou areaμg/g

μg/g
样品号	Sr	Rb	Ba	Th	Ta	Nb	Zr	Hf	Sc	Cr	Ni	Co	V	U	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y
B063-1	127	0.59	45.6	0.34	0.25	3.56	83.9	2.77	45.2	172	60.1	39.8	297	0.25	3.04	8.57	1.35	7.94	2.79	0.84	4.03	0.87	4.92	1.28	3.24	0.61	3.26	0.53	40.0
B063-2	126	1.11	29.5	0.35	0.26	3.58	83.5	2.69	45.2	163	62.1	46.9	329	0.14	3.82	10.6	1.69	9.35	2.89	1.03	4.09	0.85	4.68	1.18	3.09	0.58	3.12	0.51	36.0
B063-3	133	0.49	31.5	0.33	0.25	3.44	80.2	2.61	42.4	144	49.8	36.9	294	0.28	3.51	9.45	1.54	8.74	2.80	1.03	3.73	0.79	4.66	1.15	3.02	0.57	3.01	0.49	37.0
B063-4	98.6	0.46	16.2	0.38	0.29	3.79	91.8	2.96	47.0	158	68.1	46.4	322	0.29	4.01	11.5	1.86	10.4	3.17	1.07	3.93	0.93	5.37	1.32	3.40	0.66	3.41	0.55	41.1
B063-6	98.3	3.65	56.0	0.41	0.29	4.23	97.2	3.03	39.3	29.4	31.5	49.2	367	0.14	5.89	15.7	2.29	11.3	3.08	1.17	4.38	0.85	4.91	1.22	3.14	0.59	3.16	0.51	36.7

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