西准噶尔晚古生代中基性岩墙群岩石学成因及地质意义

贺新星; 肖龙; 王国灿; 高睿; 杨钢; 鄢圣武

doi:10.3799/dqkx.2015.064

西准噶尔晚古生代中基性岩墙群岩石学成因及地质意义

doi: 10.3799/dqkx.2015.064

贺新星^{1, 2,},
肖龙^2, ,,
王国灿^{2, 3},
高睿^{2, 4},
杨钢^{2, 5},
鄢圣武^{2, 6}

1.
江苏省地质调查研究院，江苏南京 210018
2.
中国地质大学地球科学学院，湖北武汉 430074
3.
中国地质大学地质过程与矿产资源国家重点实验室，湖北武汉 430074
4.
成都理工大学地球科学学院，四川成都 610059
5.
中国地震局地震研究所地震大地测量重点实验室，湖北武汉 430071
6.
四川省地质调查院，四川成都 610081

基金项目:

新疆1∶25万铁厂沟镇幅(L45C002001)与克拉玛依市幅(L45C003001)区调修测项目 1212011120502

西准噶尔克拉玛依后山地区三维地质调查试点项目 1212011220245

详细信息

作者简介:
贺新星(1987-)，男，助理工程师，主要从事区域地质矿产调查.E-mail：hxx_king01@163.com

通讯作者:
肖龙，E-mail：Longxiao@cug.edu.cn

中图分类号: P581
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出版历程
- 收稿日期: 2014-10-15
- 刊出日期: 2015-05-15

Petrogenesis and Geological Implications of Late Paleozoic Intermediate-Basic Dyke Swarms in Western Junggar

He Xinxing^{1, 2
,},
Xiao Long^{2
, ,},
Wang Guocan^{2, 3},
Gao Rui^{2, 4},
Yang Gang^{2, 5},
Yan Shengwu^{2, 6}

1.
Geological Survey of Jiangsu Province, Nanjing 210018, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
5.
Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
6.
Geological Survey of Sichuan Province, Chengdu 610081, China

摘要

摘要: 中基性岩墙群的形成及产出对研究区域大地构造背景和岩浆演化过程具有重要的地质意义.对西准噶尔地区的夏尔蒲中基性岩墙群和小西湖中基性岩墙群中样品(共18件)进行了岩石学、锆石U-Pb年代学、岩石地球化学和同位素地球化学等方面的研究.结果显示，夏尔蒲和小西湖岩墙群岩石类型以闪长玢岩为主，含少量辉绿岩.LA-ICP-MS锆石U-Pb年代学表明夏尔蒲岩墙群的侵位年龄为308.6±5.5 Ma.岩石均具有高Mg^#(＞40)、MgO(＞3%)、Al₂O₃(＞16%)；全岩A/CNK值多在0.9左右，A/NK＞2，属准铝质岩石；岩石整体属钙碱性玄武岩/安山岩系列.岩石具有较低的稀土总量(多在40×10^-6~60×10^-6)，具轻稀土富集、重稀土亏损及Eu正异常等特征((La/Yb)_N为3.03~11.32，δEu=1.00~1.20)；明显富集大离子亲石元素K、Rb、Ba、Sr，亏损高场强元素Nb、Ta、Ti、Th，呈现了俯冲消减带岩石的地球化学特征.同时，岩石具有较高的Sr(均大于500 ×10^-6)、较低的Y(大多小于10×10^-6)和Yb(多在1×10^-6左右)含量，较高的Sr/Y比值(36~95)，大多数样品具有富镁埃达克质岩石的组成特征.岩石具有亏损的Sr-Nd同位素组成((⁸⁷Sr/⁸⁶Sr)_i=0.703 58~0.703 80，ε_Nd(t)=5.76~6.34).元素及同位素地球化学资料表明岩浆源区中既有亏损地幔组分的参与，又有俯冲消减作用的印迹.结合区域地质特征及前人研究成果，结果表明晚石炭世时西准噶尔地区已进入后碰撞阶段.由于俯冲残留大洋板片部分熔融，产生的熔体在与亏损地幔一定程度相互作用后，经单斜辉石的分离结晶而形成了夏尔蒲和小西湖岩墙群中富镁埃达克质岩石；而来源于亏损地幔的岩浆同样经单斜辉石的分离结晶后，形成了夏尔蒲岩墙群中的辉绿岩和小西湖岩墙群中的角闪闪长玢岩.大规模中基性岩墙群的产出则进一步表明晚石炭世时西准噶尔地区处于后碰撞的伸展拉张构造背景之下.
- 西准噶尔 /
- 中基性岩墙群 /
- 残余俯冲大洋板片 /
- 亏损地幔 /
- 岩石学 /
- 地球化学
Abstract: Understanding of the formation and occurrence of intermediate-basic dyke swarms can facilitate future studies on the magmatic evolution and tectonic settings. The Xiaerpu and Xiaoxihu intermediate-basic dyke swarms in West Junggar are principally composed of dioritic porphyrite, with minor diabase. LA-ICP-MS zircon U-Pb dating results indicate that the Xiaerpu dyke swarm is emplaced with age of 308.6±5.5 Ma. It is concluded that these dykes are the products of magmatism in Late Carboniferous based on the geological relationship between the dykes and host granitic rocks, and previous chronological studies. The dykes are characterized by high Mg^#(> 40), high MgO(> 3%) and Al₂O₃(> 16%), belonging to calc-alkaline rocks and metaluminous rocks (with A/CNK approximately at 0.9 and A/NK > 2). The rocks have lower total REE (most are concentrated in 40×10^-6-60 ×10^-6), with enriched LREE and slightly positive Eu anomalies ((La/Yb)_N=3.03-11.32, δEu=1.00-1.20). All samples are highly depleted in (Nb, Ta, Ti and Th), and enriched in (Sr, Ba, K and Rb). Meanwhile, the high contents of Sr (> 500×10^-6), low contents of Y and Yb, high values of Sr/Y ratios (36.98-95.74), indicate the rocks (except sample XEP01, XEP02 and XXH06) are analogous to Mg-enriched adakitic rocks. Dykes have depleted Sr-Nd isotopic composition ((⁸⁷Sr/⁸⁶Sr)_i=0.703 58-0.703 80, ε_Nd(t)=5.76-6.34). Geochemical and isotopic compositions indicate that depleted-mantle components and materials related to subduction have prominent significance in the origin source of these dykes. Combined with the district geological evolution history and previous studies, we propose that West Junggar was under a post-collisional regime in Late Carboniferous. Due to the melting of remnant subducted oceanic slab, the slab melts interacted with the mantle materials to varying extent during ascent, and then accompanied fractional crystallization of clinopyroxene that generated the Mg-enriched adakitic rocks in Xiaerpu and Xiaoxihu intermediate-basic dyke swarms; and fractional crystallization of clinopyroxene of depleted-mantle materials metasomatised by slab melts can account for the formation of the diabase in Xiaerpu dyke swarm and the amphibolic diorite in Xiaoxihu dyke swarm. The emplacement of large-scale intermediate-basic dyke swarms further show that West Junggar was under a post-collisional extensional environment in Late Carboniferous.
- western Junggar /
- intermediate-basic dyke swarm /
- remnant subducted oceanic slab /
- depleted-mantle /
- petrology /
- geochemistry

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图 1 中亚造山带大地构造纲要图(a)，西准噶尔地区地质简图(b)及夏尔蒲和小西湖岩墙群地质简图(c)

图a, b改自Chen et al.(2010)

Fig. 1. Tectonic sketch of Central Asian orogenic belt (a), simplified geological sketch of western Junggar (b) and geological sketch of Xiaerpu and Xiaoxihu intermediate-basic dyke swarms (c)

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图 2 中基性岩墙典型显微照片

a.辉绿岩；b~d.闪长玢岩；Pl.斜长石；Amp.角闪石；Cpx.单斜辉石；Ep.绿帘石；Chl.绿泥石

Fig. 2. Microphotographs of the intermediate-basic dykes

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图 3 XEP04锆石CL图像

圆圈为U-Pb年龄分析点，蓝色圆圈代表所选结晶年龄

Fig. 3. CL images of zircons from XEP04

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图 4 XEP04锆石U-Pb谐和图(a)及加权平均年龄(b)

Fig. 4. Zircon U-Pb concordia data (a) and weighted average age (b) for XEP04

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图 5 Zr/TiO₂-Nb/Y图解(a)和AFM图解(b)

图a据Winchester and Floyd(1977)；图b据Irvine and Baragar(1971)

Fig. 5. Zr/TiO₂-Nb/Y relationship (a) and AFM relationships (b)

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图 6 岩墙哈克图解

Fig. 6. Hark relationships of geochemistry for dykes

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图 7 夏尔蒲岩墙群球粒陨石标准化稀土配分模式(a)，小西湖岩墙群球粒陨石标准化稀土配分模式(b)，夏尔蒲岩墙群原始地幔标准化蛛网图(c)和小西湖岩墙群原始地幔标准化蛛网图(d)

球粒陨石及原始地幔标准化数据来自Sun and Mcdonough(1989)

Fig. 7. Chondrite-normalized REE abundances in the Xiaerpu dyke swarm (a), Chondrite-normalized REE abundances in the Xiaoxihu dyke swarm (b), Primitive mantle-normalized trace element abundances in the Xiaerpu dyke swarm (c) and Primitive mantle-normalized trace element abundances in the Xiaoxihu dyke swarm (d)

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图 8 ε_Nd(t)-(⁸⁷Sr/⁸⁶Sr)_i图解(a)和Nd同位素演化趋势(b)

早-中元古代地壳数据来自于Hu et al.(2000)，北疆早-中古生代地壳数据引自Chen and Arakawa(2005)

Fig. 8. Initial Sr isotopic compositions (⁸⁷Sr/⁸⁶Sr)_i-ε_Nd(t) relationship (a) and Nd isotopic evolution (b) of the intermediate-basic dykes and hosted granites in West Junggar

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图 9 Nb-Nb/Ta图解(a)和Nb-Nb/La图解(b)

据Rudnick et al.(2000)

Fig. 9. Relationships of Nb-Nb/Ta (a) and Nb-Nb/La (b)

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图 10 Mg^#-(⁸⁷Sr/⁸⁶Sr)_i图解(a)，SiO₂-(⁸⁷Sr/⁸⁶Sr)_i图解(b)和Mg^#-Nb/La图解(c)

图c据He et al.(2010)

Fig. 10. Relationships of Mg^#-(⁸⁷Sr/⁸⁶Sr)_i (a), SiO₂-(⁸⁷Sr/⁸⁶Sr)_i (b) and Mg^#-Nb/La (c)

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图 11 埃达克质岩成因图解

俯冲洋壳的数据来自Defant and Drummond(1990), Drummond et al.(1996)和Aguillon-Robles et al.(2001)资料；拆沉下地壳的数据来自Xu et al.(2002)和Wang et al.(2006)资料；加厚下地壳的数据来源于Petford and Atherton(1996)和Wang et al.(2006)资料；西藏埃达克质岩数据来源于Chung et al.(2003)，Hou et al.(2004)和Wang et al.(2005)资料；安第斯火山岩带数据来自Stern and Kilian(1996)

Fig. 11. Geochemical data for adakitic rocks from different petrogenesis

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图 12 K-Rb图解(a)和Sr/Y-Y图解(b)

据Martin et al.(2005)

Fig. 12. Relationships of K-Rb (a) and Sr/Y-Y (b)

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表 1 XEP04锆石LA-ICP-MS U-Pb定年结果

Table 1. Zircon LA-ICP-MS U-Pb dating result for XEP04

分析点号	²³²Th (10^-6)	²³⁸U (10^-6)	Th/U	²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U
分析点号	²³²Th (10^-6)	²³⁸U (10^-6)	Th/U	比值	1σ	比值	1σ	年龄(Ma)	1σ	年龄(Ma)	1σ
XEP04-01	71.25	115.46	0.62	0.421 73	0.036 46	0.052 41	0.000 68	357	26	329	4
XEP04-02	43.32	48.10	0.90	0.395 28	0.020 05	0.052 70	0.000 80	338	15	331	5
XEP04-03	1 352.92	2 171.99	0.62	0.412 61	0.005 97	0.055 48	0.000 32	351	4	348	2
XEP04-04^*	183.93	234.67	0.78	0.330 98	0.037 63	0.047 34	0.000 78	290	29	298	5
XEP04-05	23.19	37.86	0.61	0.427 74	0.041 98	0.051 26	0.001 12	362	30	322	7
XEP04-06	41.44	88.56	0.47	0.407 52	0.027 57	0.051 32	0.000 78	347	20	323	5
XEP04-07^*	47.25	59.84	0.79	0.368 99	0.032 75	0.050 44	0.001 12	319	24	317	7
XEP04-08^*	94.45	137.27	0.69	0.368 19	0.015 24	0.049 00	0.000 67	318	11	308	4
XEP04-09^*	141.60	517.26	0.27	0.370 90	0.009 36	0.050 14	0.000 61	320	7	315	4
XEP04-10^*	32.92	69.10	0.48	0.390 98	0.029 49	0.047 82	0.000 95	335	22	301	6
XEP04-11^*	32.23	50.68	0.64	0.375 10	0.026 61	0.048 43	0.001 00	323	20	305	6
XEP04-12^*	241.33	668.75	0.36	0.374 16	0.007 10	0.050 78	0.000 75	323	5	319	5
XEP04-13^*	45.75	59.25	0.77	0.379 82	0.016 23	0.049 45	0.000 62	327	12	311	4
XEP04-14	212.03	226.43	0.94	0.518 31	0.019 17	0.052 25	0.001 06	424	13	328	6
XEP04-15^*	106.12	173.01	0.61	0.363 19	0.039 22	0.046 86	0.001 02	315	29	295	6
XEP04-16^*	128.94	244.85	0.53	0.379 18	0.033 44	0.049 46	0.001 49	326	25	311	9
XEP04-17	71.87	100.11	0.72	0.655 23	0.358 96	0.050 84	0.003 47	512	220	320	21
XEP04-18	89.00	180.09	0.49	0.400 68	0.063 60	0.063 11	0.001 08	342	46	395	7
XEP04-19	54.85	651.35	0.08	0.355 96	0.061 59	0.056 07	0.001 33	309	46	352	8
XEP04-20	186.18	187.84	0.99	0.452 47	0.067 03	0.071 27	0.001 43	379	47	444	9
注：*所选取的代表岩墙结晶年龄的锆石U-Pb年龄.

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表 2 夏尔蒲和小西湖岩墙群地球化学分析结果

Table 2. Chemical analysis for Xiaerpu and Xiaoxihu intermediate-basic dyke swarms

样品	闪长(玢)岩					辉绿岩	闪长(玢)岩				辉绿岩		闪长(玢)岩
样品	XXH01	XXH02	XXH03	XXH04	XXH05	XXH06	XXH07	XXH08	XXH09	XXH10	XEP01	XEP02	XEP03	XEP04	XEP05	XEP06	XEP07	XEP08
SiO₂	60.49	58.10	57.32	57.50	55.34	52.82	55.67	53.64	57.02	61.99	50.87	49.24	57.75	58.86	57.80	56.71	58.72	57.85
TiO₂	0.63	0.58	0.64	0.61	0.82	0.91	0.73	0.96	0.73	0.52	0.84	1.42	0.75	0.61	0.60	0.76	0.56	0.64
Al₂O₃	16.86	16.55	17.07	17.26	16.85	16.25	17.57	15.66	16.60	17.39	16.29	16.83	16.16	17.05	16.91	17.38	17.21	18.51
Fe₂O₃	1.98	0.64	1.90	1.56	2.07	2.74	1.95	2.02	2.40	1.72	5.61	2.76	2.63	1.38	1.14	1.27	0.92	2.35
FeO	3.10	4.10	3.80	4.22	4.18	4.72	4.32	4.35	3.67	2.38	1.82	6.70	3.87	3.77	4.18	4.55	4.18	3.47
MnO	0.09	0.07	0.08	0.09	0.09	0.11	0.09	0.10	0.10	0.07	0.18	0.16	0.11	0.11	0.15	0.11	0.12	0.09
MgO	2.90	3.92	3.50	3.90	4.21	6.64	3.76	5.27	4.41	1.95	4.99	6.17	5.47	4.05	4.04	4.43	3.84	3.33
CaO	5.66	5.31	4.95	7.40	6.12	8.00	5.48	6.22	6.50	4.87	7.30	7.59	6.05	6.45	6.17	6.49	6.17	6.41
Na₂O	3.91	4.15	4.16	3.29	3.89	3.18	3.85	3.73	3.68	3.90	3.37	3.65	3.67	4.12	3.54	3.91	3.66	4.22
K₂O	0.83	1.03	2.03	0.47	2.13	0.83	2.17	1.42	1.36	2.78	1.19	1.43	0.55	1.12	2.12	1.41	1.34	0.83
P₂O₅	0.14	0.13	0.13	0.11	0.17	0.21	0.14	0.22	0.17	0.12	0.31	0.23	0.13	0.14	0.11	0.16	0.10	0.14
H₂O⁺	1.93	2.91	2.74	2.23	2.34	3.29	2.97	3.28	2.64	2.03	3.69	3.10	2.39	1.68	2.04	2.22	2.16	1.82
CO₂	1.25	2.31	1.45	1.15	1.55	0.10	1.05	2.91	0.50	0.04	3.31	0.50	0.28	0.45	1.00	0.40	0.80	0.12
Total	99.77	99.80	99.77	99.79	99.76	99.80	99.75	99.78	99.78	99.76	99.77	99.78	99.81	99.79	99.80	99.80	99.78	99.78
FeO_T	4.88	4.68	5.51	5.62	6.04	7.19	6.07	6.17	5.83	3.93	6.87	9.18	6.24	5.01	5.21	5.69	5.01	5.58
Alk	4.74	5.18	6.19	3.76	6.02	4.01	6.02	5.15	5.04	6.68	4.56	5.08	4.22	5.24	5.66	5.32	5.00	5.05
Mg^#	52	60	53	56	56	62	53	61	58	47	57	55	61	59	58	58	58	52
A/CNK	0.96	0.94	0.95	0.89	0.85	0.78	0.94	0.82	0.86	0.95	0.81	0.79	0.92	0.86	0.87	0.88	0.92	0.95
A/NK	2.30	2.08	1.89	2.91	1.93	2.65	2.02	2.04	2.20	1.84	2.38	2.23	2.44	2.13	2.08	2.18	2.30	2.36
La	6.08	5.47	5.83	6.21	7.95	13.4	5.40	8.70	8.01	13.8	22.9	8.21	5.64	5.58	6.85	5.89	6.11	5.27
Ce	13.75	12.74	13.33	13.43	18.14	29.90	12.58	19.88	18.39	30.89	51.98	20.18	13.22	12.59	15.21	17.36	13.27	12.31
Pr	1.93	1.83	1.85	1.81	2.61	4.07	1.86	2.74	2.53	3.09	7.15	2.96	1.88	1.91	1.95	1.96	1.73	1.76
Nd	8.38	7.79	8.17	7.61	11.50	17.60	8.42	11.9	10.9	12.1	31.4	13.6	8.67	9.32	8.13	8.60	7.23	7.77
Sm	2.04	1.97	2.11	1.87	2.61	3.90	2.12	2.85	2.58	2.32	6.56	3.51	2.51	1.98	1.98	2.10	1.77	1.95
Eu	0.68	0.66	0.73	0.65	0.87	1.22	0.79	0.98	0.87	0.83	1.93	1.30	0.85	0.71	0.69	0.79	0.61	0.71
Gd	1.70	1.58	1.92	1.68	2.41	3.19	1.86	2.71	2.25	1.97	4.90	3.63	2.54	1.76	1.70	1.84	1.50	1.75
Tb	0.26	0.25	0.28	0.27	0.37	0.47	0.30	0.40	0.34	0.31	0.60	0.60	0.41	0.28	0.27	0.31	0.24	0.25
Dy	1.56	1.31	1.68	1.58	2.20	2.57	1.74	2.31	2.04	1.72	3.04	3.79	2.34	1.61	1.56	1.67	1.41	1.51
Ho	0.31	0.27	0.33	0.31	0.44	0.46	0.34	0.44	0.41	0.33	0.51	0.75	0.44	0.30	0.32	0.33	0.29	0.28
Er	0.82	0.73	0.90	0.88	1.16	1.34	0.96	1.20	1.13	0.95	1.38	2.15	1.23	0.94	0.88	0.92	0.78	0.73
Tm	0.11	0.10	0.12	0.12	0.17	0.18	0.14	0.16	0.15	0.14	0.19	0.30	0.18	0.14	0.13	0.12	0.11	0.11
Yb	0.79	0.69	0.80	0.80	1.06	1.08	0.83	1.06	1.04	0.90	1.16	1.95	1.03	0.82	0.76	0.81	0.72	0.63
Lu	0.12	0.11	0.13	0.12	0.17	0.18	0.12	0.16	0.16	0.13	0.17	0.28	0.17	0.13	0.11	0.12	0.11	0.10
Y	8.12	7.31	8.86	8.05	10.70	12.60	9.18	11.50	10.70	9.09	13.50	19.60	11.90	8.50	8.62	8.51	7.86	7.39
δEu	1.09	1.11	1.08	1.09	1.04	1.03	1.18	1.06	1.08	1.15	4.78	1.50	1.62	2.22	2.42	2.51	2.36	2.34
(La/Sm)_N	1.92	1.79	1.78	2.14	1.97	2.22	1.64	1.97	2.00	3.85	2.25	1.51	1.45	1.82	2.23	1.81	2.22	1.74
(La/Yb)_N	5.25	5.48	4.77	5.64	5.10	8.19	4.78	5.75	5.24	11.32	14.09	3.03	3.91	4.87	6.50	5.24	6.06	6.02
Zr	52.49	61.02	51.92	50.48	65.21	85.86	54.38	88.86	75.62	100.90	84.35	105.90	55.91	55.99	47.21	53.05	47.28	48.30
Nb	1.16	1.48	1.11	1.48	1.98	2.63	1.16	3.53	2.02	2.06	2.13	2.58	1.59	1.08	1.61	1.61	1.49	1.08
Ba	452.10	292.90	596.20	270.90	625.60	325.40	859.30	442.60	443.30	932.00	323.90	370.10	255.30	346.70	380.10	306.60	347.10	411.30
Hf	1.86	1.93	1.69	1.77	2.11	2.57	1.79	2.51	2.27	3.21	2.52	2.89	2.04	1.88	1.53	1.67	1.62	1.65
Ta	0.09	0.19	0.09	0.21	0.20	0.15	0.09	0.17	0.14	0.22	0.17	0.21	0.12	0.69	0.14	0.13	0.11	0.06
Li	37.54	30.77	30.31	19.86	17.81	23.93	27.19	27.21	40.39	23.26	37.20	21.63	18.79	14.48	23.13	17.05	16.50	17.41
Sc	14.47	15.64	17.02	19.19	18.88	24.69	17.28	17.65	17.31	10.91	20.82	25.98	18.19	17.01	18.00	18.42	17.25	13.42
Cr	19.41	107.50	22.93	48.75	61.59	344.70	28.61	179.20	107.00	10.76	88.21	134.40	210.20	55.04	55.86	114.70	53.59	13.41
Co	20.20	21.82	24.18	26.11	26.61	40.18	26.20	31.76	26.25	12.50	29.30	40.61	27.71	22.72	24.21	26.68	21.45	22.43
Ni	30.52	73.61	37.83	57.41	51.16	152.20	36.50	109.20	81.27	12.36	76.19	105.60	101.20	57.05	57.40	72.31	58.55	33.07
Rb	15.35	20.76	39.20	13.35	40.52	17.94	61.88	37.09	39.73	82.60	45.36	43.70	12.68	36.15	65.07	39.26	41.50	12.93
Cs	0.86	0.54	1.05	0.80	0.84	0.39	1.53	1.26	1.54	1.93	1.13	1.90	0.91	1.28	3.28	1.15	1.02	1.24
Pb	15.17	7.16	10.06	8.24	12.55	7.84	8.70	10.90	9.85	11.29	7.34	6.78	6.99	5.88	4.73	2.79	5.61	4.09
Th	1.36	0.81	1.68	1.95	1.06	2.31	0.92	1.40	1.41	4.63	3.19	1.78	1.27	1.45	1.78	1.43	1.61	0.90
U	0.75	0.49	0.69	0.78	0.51	0.95	1.00	0.56	0.66	1.86	0.89	0.57	0.38	0.55	0.86	0.34	0.77	0.44
Sr	777.60	621.50	644.50	593.40	721.60	592.20	664.40	631.80	708.20	519.40	790.50	726.30	521.90	745.60	533.70	651.50	603.80	676.10
V	131.40	125.40	151.50	150.60	168.80	168.80	158.80	144.70	143.70	93.81	171.40	208.30	132.80	140.80	150.50	149.20	143.30	136.30
Sr/Y	95.74	85.06	72.72	73.70	67.57	46.93	72.41	55.18	66.50	57.16	58.43	36.98	44.04	87.74	61.89	76.54	76.87	91.46
Nb/Ta	13.44	8.02	13.07	6.98	10.02	17.10	13.60	20.99	14.04	9.21	12.93	12.28	12.85	1.56	11.49	12.89	13.81	18.00
Zr/Hf	28.25	31.60	30.67	28.46	30.92	33.41	30.41	35.40	33.34	31.45	33.54	36.69	27.45	29.81	30.92	31.86	29.19	29.25
注：主量元素单位：%；微量元素单位：10^-6；稀土元素单位：10^-6.

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表 3 岩墙全岩Sr-Nd同位素组成

Table 3. Whole-rock Sr-Nd isotope compositions for intermediate-basic dykes

样号	XEP01	XEP03	XXH06
⁸⁷Rb/⁸⁶Sr	0.166 0	0.070 3	0.087 6
⁸⁷Sr/⁸⁶Sr	0.704 525	0.704 101	0.703 966
¹⁴⁷Sm/¹⁴⁴Nd	0.126 3	0.175 1	0.134 3
¹⁴³Nd/¹⁴⁴Nd	0.512 791	0.512 896	0.512 837
ε_Sr(t)	-4.90	-4.96	-7.96
(⁸⁷Sr/⁸⁶Sr)_i	0.703 80	0.703 79	0.703 58
ε_Nd(0)	2.98	5.03	3.88
ε_Nd(t)	5.76	5.89	6.34
(¹⁴³Nd/¹⁴⁴Nd)_i	0.512 536	0.512 543	0.512 566
f_Sm/Nd	-0.36	-0.11	-0.32
T_DM(Ga)	0.63	1.00	0.60

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