内蒙古索伦山蛇绿岩锆石U-Pb年代学、地球化学特征及其地质意义

doi:10.19657/j.geoscience.1000-8527.2020.011

现代地质 ›› 2020, Vol. 34 ›› Issue (03): 399-417.DOI: 10.19657/j.geoscience.1000-8527.2020.011

• 岩石学 • 下一篇

内蒙古索伦山蛇绿岩锆石U-Pb年代学、地球化学特征及其地质意义

柳志华¹^,²(), 顾雪祥¹^,³(), 章永梅¹^,²^,³, 王佳琳³, 刘涛⁴, 王文东⁴, 赵伟¹, 陈洋¹

1.中国地质大学(北京) 地球科学与资源学院,北京 100083
2.南京大学内生金属矿床成矿机制研究国家重点实验室,江苏南京 210046
3.中国地质大学(北京) 地质过程与矿产资源国家重点实验室,北京 100083
4.中国地质调查局哈尔滨自然资源综合调查中心,黑龙江哈尔滨 150081

收稿日期:2019-06-04 修回日期:2019-12-10 出版日期:2020-07-04 发布日期:2020-07-05
通讯作者: 顾雪祥
作者简介:顾雪祥,男,教授,1963年出生,矿床学专业,主要从事矿床学与矿床地球化学研究。Email: xuexiang_gu@cugb.edu.cn。
柳志华,男,硕士研究生,1996年出生,矿物学、岩石学、矿床学专业,主要从事矿床学与矿床地球化学研究。Email: liuzhihua_zh@163.com。
基金资助:
中国地质调查局“东北内蒙古沿边及特殊地区地质矿产调查”项目(DD20160078);国家自然科学基金项目(41572062);国家重点研发计划“深地资源勘查开采”重点专项(2018YFC0604003);中央高校基本科研业务费专项资金项目(2652017226);南京大学内生金属矿床成矿机制研究国家重点实验室开放基金项目(2019-LAMD-11)

Zircon U-Pb Geochronology, Geochemistry Characteristics and Geological Significance of the Solonker Ophiolite, Inner Mongolia

LIU Zhihua¹^,²(), GU Xuexiang¹^,³(), ZHANG Yongmei¹^,²^,³, WANG Jialin³, LIU Tao⁴, WANG Wendong⁴, ZHAO Wei¹, CHEN Yang¹

1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, Jiangsu 210046, China
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
4. Harbin Natural Resources Comprehensive Investigation Center, China Geological Survey, Harbin, Heilongjiang 150081, China

Received:2019-06-04 Revised:2019-12-10 Online:2020-07-04 Published:2020-07-05
Contact: GU Xuexiang

摘要/Abstract

摘要：

为加深对中亚造山带东段晚古生代构造背景的认识,选取内蒙古索伦山蛇绿岩中较新鲜的玄武岩和辉长岩开展岩相学、年代学和地球化学研究。结果表明,玄武岩和辉长岩的LA-ICP-MS锆石U-Pb谐和年龄分别为(276.4±1.4) Ma和(273.9±3.3) Ma,形成于早二叠世。二者均为亚碱性拉斑系列,Mg^#分别变化于41~50和62~65之间,均低于幔源原生岩浆值;主量元素与SiO₂含量之间具有一定的线性关系,反映岩浆演化过程中分离结晶占主要地位。两种岩石的Th/La、Th/Ce和Lu/Yb值均低于大陆地壳的平均值,而与幔源岩浆的比值接近,推测岩浆演化过程中地壳混染的影响不大。稀土元素组成上,玄武岩表现为轻稀土亏损的N-MORB特征,可能起源于尖晶石二辉橄榄岩亏损地幔的5%~10%部分熔融;辉长岩具有轻稀土略亏损、整体平坦的稀土特征,但稀土元素总量明显比N-MORB更亏损,是源区熔融程度更大所致。此外,二者都富集K、Sr、Ba和Pb等大离子亲石元素而亏损Nb、Ta等高场强元素,具有岛弧岩浆特征,指示它们遭受了俯冲板片含水流体或者俯冲沉积物熔体的影响。上述岩石地球化学特征表明,索伦山蛇绿岩应为俯冲带上盘(SSZ)型,推测其形成于洋内弧后盆地。索伦山SSZ型蛇绿岩的存在说明该区早二叠世仍存在洋内俯冲,综合分析认为古亚洲洋在晚二叠世—早三叠世沿索伦—西拉木伦一线闭合。

关键词: 蛇绿岩, 年代学, 地球化学, 古亚洲洋, 索伦山, 内蒙古

Abstract:

To deepen our understanding on the Late Paleozoic tectonics of the eastern Central Asian Orogenic Belt, a study of the petrology, geochronology and geochemistry of fresh basalts and gabbros in the Solonker ophiolitic mélange belt were reported. Zircon grains from these basalts and gabbros yielded²⁰⁶Pb/²³⁸U ages of (276.7±2.7) Ma and (274.1±3.2) Ma, respectively, indicating an Early Permian emplacement age. Both the basalts and gabbros are tholeiitic, and have low Mg^# values of 41-50 and 62-65, respectively, both below the primary magma value. Meanwhile, the basalt and gabbro samples fall along a fractionation trend in the Harker diagrams, suggesting a dominant role of fractional crystallization in the magma evolution.The Th/La, Th/Ce and Lu/Yb ratios of the two rock types are below those of the average continental crust, but similar to those of typical mantle-derived magmas. Therefore,it is inferred that crustal contamination had little influence on the mafic magmas.Rare earth element (REE) compositions show that the basalts are of the N-MORB-type with light REE (LREE) depletions,probably originated from 5%-10% partial melting of the depleted spinel lherzolite mantle. Gabbros are slightly LREE-depleted with a flat REE distribution pattern, and have clearly lower total REEs (Σ REEs) than N-MORB, probably due to a higher degree of partial melting than the basalts in the source region.In addition, both rock types are highly enriched in large ion lithophile elements (LILEs: Rb, Sr, Ba, Pb) and depleted in high-field-strength elements (HFSEs: Nb, Ta), similar to typical island arc magmas.These features imply that their magmas were affected by subduction-related fluids, or were derived from the melting of subducting sediments.The geochemical characteristics indicate that the Solonker ophiolites belong to the supra-subduction zone (SSZ)-type, and may have formed in an intra-oceanic backarc basin.This indicates that intra-oceanic subduction still persisted till at least the Early Permian in the study area.Comprehensive analyses suggest that the Paleo-Asian Ocean(PAO) was closed in the Late Permian to Early Triassic along the Solonker-Xar Moron suture zone.

Key words: ophiolite, geochronology, geochemistry, Paleo-Asian Ocean, Solonker, Inner Mongolia

中图分类号:

柳志华, 顾雪祥, 章永梅, 王佳琳, 刘涛, 王文东, 赵伟, 陈洋. 内蒙古索伦山蛇绿岩锆石U-Pb年代学、地球化学特征及其地质意义[J]. 现代地质, 2020, 34(03): 399-417.

LIU Zhihua, GU Xuexiang, ZHANG Yongmei, WANG Jialin, LIU Tao, WANG Wendong, ZHAO Wei, CHEN Yang. Zircon U-Pb Geochronology, Geochemistry Characteristics and Geological Significance of the Solonker Ophiolite, Inner Mongolia[J]. Geoscience, 2020, 34(03): 399-417.

图/表 14

图1 区域大地构造位置图(a)、区域构造简图(b)和乌珠尔少布特地区地质图(c) ((a)据张晓飞等[8]修改;(b)据Jian等[5]和Luo等[23]修改;(c)据Jian等[5]和付冬[21]修改 (a)图中:①乌里雅斯太活动大陆边缘;②贺根山蛇绿混杂岩带;③北部增生造山带;④索伦缝合带;⑤南部增生造山带;⑥华北克拉通北缘。(b)图中年代学数据来源:(1)—(6)标记的年代学数据分别来源于文献[16,23,21,22,5,24]。1. 中新生代沉积;2. 下二叠统大石寨组;3. 上石炭统本巴图组;4. 蛇绿岩基质(硅泥质、粉砂岩、砂岩);5. 超基性岩;6. 纯橄岩;7. 方辉橄榄岩;8. 玄武岩;9. 辉绿岩;10. 辉长岩;11. 闪长岩;12. 石英二长岩;13. 硅质岩块;14. 灰岩岩块;15. 砂岩岩块;16. 断层;17. 实测剖面;18. 同位素年龄样品采样点;19. 地球化学样品采样点

Fig.1 Regional geotectonic map (a), schematic map of regional tectonics (b) and geological map of the Uzhur Shaobute (c)

图2 索伦山蛇绿岩野外地质特征及各组分间的接触关系 (a)硅化-碳酸盐化超基性岩风化壳;(b)超基性岩与玄武岩及硅质岩呈断层接触;(c)超基性岩岩块与基质呈断层接触,覆盖于基质之上;(d)硅质岩覆盖在玄武岩上;(e)灰绿色硅质岩;(f)层状辉长岩,层理被劈理置换;(g)脉状辉绿岩侵入碎屑沉积岩;(h)超基性岩块分布在粉砂质基质中;(i)硅质岩岩块分布在硅泥质沉积物中

Fig.2 Field geological photos of the Solonker ophiolite components and their contact relationship

图3 乌珠尔地区实测剖面图(蛇绿岩组分接触关系及北部蛇绿混杂岩与南部混杂岩的接触关系)

Fig.3 Geological profile in the Uzhur area, showing the contact relationships among ophiolite components and those between the northern and southern mélanges

图4 索伦山蛇绿岩代表性岩石的岩相学特征(手标本及镜下照片) (a)蛇纹石化纯橄榄岩,含有浸染状-条带状铬铁矿;(b)墨绿色粗粒辉长岩;(c)灰绿色辉绿岩;(d)灰黑色玄武岩;(e)灰绿色玄武岩;(f)灰绿色硅质岩;(g)方辉橄榄岩,橄榄岩发生蛇纹石化,具反应边结构;(h)辉长岩,主要由单斜辉石和斜长石组成,含少量橄榄石和角闪石,具辉长-堆晶结构;(i)蚀变辉绿岩,辉石发生闪石化,长石普遍绢云母化;(j)玄武岩呈斑状结构,斑晶为单斜辉石和斜长石,基质具间粒-间隐结构;(k)玄武岩为斑状结构,斑晶为斜长石,基质为间粒结构;(l)放射虫硅质岩;Ol. 橄榄石;En. 顽火辉石;Srp. 蛇纹石;Am. 角闪石;Chr. 铬铁矿;Pl. 斜长石;Cpx. 单斜辉石;Opx. 斜方辉石;Tr. 透闪石;Qtz. 石英

Fig.4 Hand-specimen photos and thin-section microphotographs, showing the petrographic characteristics of representative rock types in the Solonker ophiolite

表1 索伦山蛇绿岩中玄武岩和辉长岩的锆石LA-ICP-MS U-Pb年龄分析结果

Table 1 LA-ICP-MS zircon U-Pb data of basalts and gabbros in the Solonker ophiolite

点号	含量/10^-6			Th/U	同位素比值						年龄/Ma
点号	Th	U	Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
SL-PM2-Zr2-1	58	77	24	0.75	0.088 4	0.002 6	2.891 9	0.085 3	0.236 9	0.003 2	1 390.7	27.8	1 379.8	22.3	1 370.6	16.8
SL-PM2-Zr2-2	195	378	34	0.51	0.053 4	0.002 0	0.527 5	0.017 9	0.071 8	0.000 8	346.4	87.0	430.1	11.9	447.0	5.1
SL-PM2-Zr2-3	115	219	20	0.52	0.055 3	0.002 1	0.556 9	0.022 0	0.072 9	0.001 0	433.4	82.4	449.5	14.3	453.3	6.3
SL-PM2-Zr2-4	136	230	149	0.59	0.159 9	0.003 0	10.442 2	0.228 6	0.470 0	0.005 2	2 454.0	32.9	2 474.8	20.4	2 483.6	22.6
SL-PM2-Zr2-5	145	251	14	0.58	0.053 9	0.002 4	0.323 0	0.015 0	0.043 3	0.000 6	368.6	100.0	284.2	11.5	273.1	3.6
SL-PM2-Zr2-6	74	130	12	0.56	0.056 7	0.002 4	0.568 7	0.023 2	0.073 0	0.001 1	479.7	94.4	457.1	15.0	454.0	6.5
SL-PM2-Zr2-7	32	75	4	0.42	0.057 9	0.003 9	0.342 2	0.021 6	0.043 0	0.000 9	524.1	147.0	298.8	16.3	271.4	5.6
SL-PM2-Zr2-8	121	282	14	0.43	0.054 3	0.00 3 0	0.293 7	0.016 2	0.039 0	0.000 5	388.9	125.9	261.5	12.7	246.7	3.3
SL-PM2-Zr2-9	108	126	8	0.86	0.053 2	0.003 6	0.318 7	0.020 4	0.044 3	0.000 9	338.9	153.7	280.9	15.7	279.5	5.5
SL-PM2-Zr2-10	120	208	12	0.58	0.054 0	0.002 5	0.337 0	0.015 8	0.045 0	0.000 6	368.6	108.3	294.9	12.0	283.9	3.8
SL-PM2-Zr2-11	83	128	7	0.65	0.051 0	0.003 8	0.304 2	0.021 3	0.043 5	0.000 8	242.7	202.8	269.7	16.6	274.7	5.1
SL-PM2-Zr2-12	109	224	20	0.48	0.056 5	0.002 4	0.566 4	0.023 4	0.072 4	0.000 9	472.3	92.6	455.7	15.2	450.4	5.3
SL-PM2-Zr2-13	124	281	25	0.44	0.056 2	0.002 1	0.565 8	0.021 8	0.072 4	0.001 1	461.2	81.5	455.3	14.1	450.9	6.4
SL-PM2-Zr2-14	91	172	16	0.53	0.055 6	0.002 5	0.544 4	0.023 1	0.071 2	0.000 9	438.9	134.2	441.3	15.2	443.3	5.6
SL-PM2-Zr2-15	83	138	13	0.60	0.056 5	0.003 0	0.563 0	0.029 3	0.072 4	0.001 5	472.3	116.7	453.5	19.0	450.8	9.2
SL-PM2-Zr2-16	42	101	9	0.42	0.055 0	0.003 5	0.542 5	0.032 4	0.072 0	0.001 3	413.0	108.3	440.1	21.3	448.5	8.0
SL-PM2-Zr2-17	116	223	14	0.52	0.052 4	0.001 9	0.361 3	0.012 9	0.050 2	0.000 7	305.6	81.5	313.2	9.6	315.8	4.5
SL-PM2-Zr2-18	168	219	13	0.77	0.053 6	0.002 2	0.323 6	0.014 2	0.043 9	0.000 8	353.8	92.6	284.7	10.9	276.7	4.9
SL-PM2-Zr2-19	90	146	14	0.62	0.056 1	0.002 8	0.546 6	0.027 3	0.071 4	0.001 2	453.8	109.2	442.8	17.9	444.6	7.2
SL-PM2-Zr2-20	120	207	12	0.58	0.050 4	0.002 4	0.305 7	0.014 8	0.044 0	0.000 7	213.0	111.1	270.8	11.5	277.5	4.4
SL-PM2-Zr2-21	34	76	7	0.45	0.055 5	0.004 2	0.540 9	0.036 9	0.071 1	0.001 4	435.2	168.5	439.0	24.3	443.0	8.4
SL-PM2-Zr2-22	124	240	21	0.52	0.055 1	0.002 0	0.553 1	0.023 0	0.072 0	0.001 2	416.7	83.3	447.0	15.0	448.2	7.2
SL-PM2-Zr2-23	93	176	16	0.53	0.055 1	0.002 1	0.549 8	0.021 2	0.072 1	0.001 1	413.0	83.3	444.9	13.9	448.7	6.4
SL-PM2-Zr2-24	135	235	21	0.58	0.054 8	0.001 9	0.546 5	0.019 7	0.071 7	0.001 1	405.6	75.9	442.7	12.9	446.2	6.6
SL-PM2-Zr2-25	82	190	17	0.43	0.055 3	0.001 9	0.549 4	0.018 9	0.071 9	0.000 9	433.4	77.8	444.6	12.4	447.6	5.5
SL-PM2-Zr2-26	180	266	25	0.68	0.056 5	0.002 2	0.558 6	0.018 7	0.072 0	0.001 2	472.3	89.8	450.6	12.2	448.5	7.5
SL-PM2-Zr2-27	122	241	22	0.51	0.056 6	0.002 8	0.555 3	0.026 0	0.071 3	0.001 0	476.0	112.0	448.5	17.0	443.7	6.0
SL-PM2-Zr2-28	84	153	8	0.55	0.051 5	0.003 3	0.299 3	0.017 7	0.043 4	0.000 8	261.2	150.0	265.9	13.8	274.2	4.9
SL-PM2-Zr2-29	129	212	12	0.61	0.050 4	0.002 3	0.304 8	0.014 2	0.043 9	0.000 7	213.0	107.4	270.1	11.0	276.7	4.2
SL-PM2-Zr2-30	77	128	7	0.60	0.053 3	0.003 9	0.325 1	0.024 1	0.044 3	0.001 0	342.7	164.8	285.8	18.4	279.6	5.9
SL-PM2-Zr2-31	144	212	12	0.68	0.052 4	0.002 7	0.316 2	0.016 8	0.043 4	0.000 8	301.9	116.7	279.0	13.0	273.7	4.9
SL-LT-Zr3-1	159	407	22	0.39	0.051 5	0.001 9	0.308 8	0.010 8	0.043 7	0.000 7	261.2	83.3	273.2	8.4	275.6	4.4
SL-LT-Zr3-2	109	355	19	0.31	0.055 5	0.002 1	0.334 8	0.013 3	0.043 8	0.001 0	431.5	88.0	293.2	10.1	276.2	6.2
SL-LT-Zr3-3	536	1 070	58	0.50	0.054 6	0.001 8	0.320 1	0.010 0	0.042 5	0.000 5	398.2	76.8	282.0	7.7	268.0	2.8
SL-LT-Zr3-4	219	542	30	0.40	0.055 2	0.002 0	0.332 9	0.012 8	0.043 8	0.000 8	420.4	79.6	291.7	9.8	276.1	5.2
SL-LT-Zr3-5	55	123	37	0.44	0.087 7	0.002 2	2.906 4	0.074 5	0.239 1	0.003 1	1 376.9	52.8	1 383.6	19.4	1 381.8	16.1
SL-LT-Zr3-6	224	369	152	0.61	0.105 4	0.002 2	4.533 0	0.105 6	0.309 5	0.004 1	1 721.9	38.7	1 737.1	19.4	1 738.0	20.4
SL-LT-Zr3-7	132	299	16	0.44	0.051 4	0.001 9	0.311 2	0.012 0	0.044 0	0.000 8	261.2	87.0	275.1	9.3	277.6	4.7
SL-LT-Zr3-8	104	242	13	0.43	0.053 1	0.002 3	0.322 2	0.013 6	0.044 1	0.000 5	331.5	96.3	283.6	10.5	278.4	3.2
SL-LT-Zr3-9	264	572	30	0.46	0.054 1	0.001 9	0.327 2	0.013 0	0.043 9	0.000 8	372.3	75.0	287.4	9.9	277.1	4.8
SL-LT-Zr3-10^*	204	508	28	0.40	0.057 1	0.002 3	0.346 3	0.013 5	0.044 2	0.000 6	494.5	91.7	301.9	10.2	278.7	3.9
SL-LT-Zr3-11	487	966	54	0.50	0.051 3	0.001 5	0.308 9	0.009 3	0.043 8	0.000 4	257.5	68.5	273.4	7.2	276.0	2.8
SL-LT-Zr3-12	486	953	53	0.51	0.054 5	0.001 9	0.320 6	0.011 6	0.042 8	0.000 5	394.5	77.8	282.4	8.9	269.9	3.3

表1 索伦山蛇绿岩中玄武岩和辉长岩的锆石LA-ICP-MS U-Pb年龄分析结果

Table 1 LA-ICP-MS zircon U-Pb data of basalts and gabbros in the Solonker ophiolite

点号	含量/10^-6			Th/U	同位素比值						年龄/Ma
点号	Th	U	Pb	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
SL-PM2-Zr2-1	58	77	24	0.75	0.088 4	0.002 6	2.891 9	0.085 3	0.236 9	0.003 2	1 390.7	27.8	1 379.8	22.3	1 370.6	16.8
SL-PM2-Zr2-2	195	378	34	0.51	0.053 4	0.002 0	0.527 5	0.017 9	0.071 8	0.000 8	346.4	87.0	430.1	11.9	447.0	5.1
SL-PM2-Zr2-3	115	219	20	0.52	0.055 3	0.002 1	0.556 9	0.022 0	0.072 9	0.001 0	433.4	82.4	449.5	14.3	453.3	6.3
SL-PM2-Zr2-4	136	230	149	0.59	0.159 9	0.003 0	10.442 2	0.228 6	0.470 0	0.005 2	2 454.0	32.9	2 474.8	20.4	2 483.6	22.6
SL-PM2-Zr2-5	145	251	14	0.58	0.053 9	0.002 4	0.323 0	0.015 0	0.043 3	0.000 6	368.6	100.0	284.2	11.5	273.1	3.6
SL-PM2-Zr2-6	74	130	12	0.56	0.056 7	0.002 4	0.568 7	0.023 2	0.073 0	0.001 1	479.7	94.4	457.1	15.0	454.0	6.5
SL-PM2-Zr2-7	32	75	4	0.42	0.057 9	0.003 9	0.342 2	0.021 6	0.043 0	0.000 9	524.1	147.0	298.8	16.3	271.4	5.6
SL-PM2-Zr2-8	121	282	14	0.43	0.054 3	0.00 3 0	0.293 7	0.016 2	0.039 0	0.000 5	388.9	125.9	261.5	12.7	246.7	3.3
SL-PM2-Zr2-9	108	126	8	0.86	0.053 2	0.003 6	0.318 7	0.020 4	0.044 3	0.000 9	338.9	153.7	280.9	15.7	279.5	5.5
SL-PM2-Zr2-10	120	208	12	0.58	0.054 0	0.002 5	0.337 0	0.015 8	0.045 0	0.000 6	368.6	108.3	294.9	12.0	283.9	3.8
SL-PM2-Zr2-11	83	128	7	0.65	0.051 0	0.003 8	0.304 2	0.021 3	0.043 5	0.000 8	242.7	202.8	269.7	16.6	274.7	5.1
SL-PM2-Zr2-12	109	224	20	0.48	0.056 5	0.002 4	0.566 4	0.023 4	0.072 4	0.000 9	472.3	92.6	455.7	15.2	450.4	5.3
SL-PM2-Zr2-13	124	281	25	0.44	0.056 2	0.002 1	0.565 8	0.021 8	0.072 4	0.001 1	461.2	81.5	455.3	14.1	450.9	6.4
SL-PM2-Zr2-14	91	172	16	0.53	0.055 6	0.002 5	0.544 4	0.023 1	0.071 2	0.000 9	438.9	134.2	441.3	15.2	443.3	5.6
SL-PM2-Zr2-15	83	138	13	0.60	0.056 5	0.003 0	0.563 0	0.029 3	0.072 4	0.001 5	472.3	116.7	453.5	19.0	450.8	9.2
SL-PM2-Zr2-16	42	101	9	0.42	0.055 0	0.003 5	0.542 5	0.032 4	0.072 0	0.001 3	413.0	108.3	440.1	21.3	448.5	8.0
SL-PM2-Zr2-17	116	223	14	0.52	0.052 4	0.001 9	0.361 3	0.012 9	0.050 2	0.000 7	305.6	81.5	313.2	9.6	315.8	4.5
SL-PM2-Zr2-18	168	219	13	0.77	0.053 6	0.002 2	0.323 6	0.014 2	0.043 9	0.000 8	353.8	92.6	284.7	10.9	276.7	4.9
SL-PM2-Zr2-19	90	146	14	0.62	0.056 1	0.002 8	0.546 6	0.027 3	0.071 4	0.001 2	453.8	109.2	442.8	17.9	444.6	7.2
SL-PM2-Zr2-20	120	207	12	0.58	0.050 4	0.002 4	0.305 7	0.014 8	0.044 0	0.000 7	213.0	111.1	270.8	11.5	277.5	4.4
SL-PM2-Zr2-21	34	76	7	0.45	0.055 5	0.004 2	0.540 9	0.036 9	0.071 1	0.001 4	435.2	168.5	439.0	24.3	443.0	8.4
SL-PM2-Zr2-22	124	240	21	0.52	0.055 1	0.002 0	0.553 1	0.023 0	0.072 0	0.001 2	416.7	83.3	447.0	15.0	448.2	7.2
SL-PM2-Zr2-23	93	176	16	0.53	0.055 1	0.002 1	0.549 8	0.021 2	0.072 1	0.001 1	413.0	83.3	444.9	13.9	448.7	6.4
SL-PM2-Zr2-24	135	235	21	0.58	0.054 8	0.001 9	0.546 5	0.019 7	0.071 7	0.001 1	405.6	75.9	442.7	12.9	446.2	6.6
SL-PM2-Zr2-25	82	190	17	0.43	0.055 3	0.001 9	0.549 4	0.018 9	0.071 9	0.000 9	433.4	77.8	444.6	12.4	447.6	5.5
SL-PM2-Zr2-26	180	266	25	0.68	0.056 5	0.002 2	0.558 6	0.018 7	0.072 0	0.001 2	472.3	89.8	450.6	12.2	448.5	7.5
SL-PM2-Zr2-27	122	241	22	0.51	0.056 6	0.002 8	0.555 3	0.026 0	0.071 3	0.001 0	476.0	112.0	448.5	17.0	443.7	6.0
SL-PM2-Zr2-28	84	153	8	0.55	0.051 5	0.003 3	0.299 3	0.017 7	0.043 4	0.000 8	261.2	150.0	265.9	13.8	274.2	4.9
SL-PM2-Zr2-29	129	212	12	0.61	0.050 4	0.002 3	0.304 8	0.014 2	0.043 9	0.000 7	213.0	107.4	270.1	11.0	276.7	4.2
SL-PM2-Zr2-30	77	128	7	0.60	0.053 3	0.003 9	0.325 1	0.024 1	0.044 3	0.001 0	342.7	164.8	285.8	18.4	279.6	5.9
SL-PM2-Zr2-31	144	212	12	0.68	0.052 4	0.002 7	0.316 2	0.016 8	0.043 4	0.000 8	301.9	116.7	279.0	13.0	273.7	4.9
SL-LT-Zr3-1	159	407	22	0.39	0.051 5	0.001 9	0.308 8	0.010 8	0.043 7	0.000 7	261.2	83.3	273.2	8.4	275.6	4.4
SL-LT-Zr3-2	109	355	19	0.31	0.055 5	0.002 1	0.334 8	0.013 3	0.043 8	0.001 0	431.5	88.0	293.2	10.1	276.2	6.2
SL-LT-Zr3-3	536	1 070	58	0.50	0.054 6	0.001 8	0.320 1	0.010 0	0.042 5	0.000 5	398.2	76.8	282.0	7.7	268.0	2.8
SL-LT-Zr3-4	219	542	30	0.40	0.055 2	0.002 0	0.332 9	0.012 8	0.043 8	0.000 8	420.4	79.6	291.7	9.8	276.1	5.2
SL-LT-Zr3-5	55	123	37	0.44	0.087 7	0.002 2	2.906 4	0.074 5	0.239 1	0.003 1	1 376.9	52.8	1 383.6	19.4	1 381.8	16.1
SL-LT-Zr3-6	224	369	152	0.61	0.105 4	0.002 2	4.533 0	0.105 6	0.309 5	0.004 1	1 721.9	38.7	1 737.1	19.4	1 738.0	20.4
SL-LT-Zr3-7	132	299	16	0.44	0.051 4	0.001 9	0.311 2	0.012 0	0.044 0	0.000 8	261.2	87.0	275.1	9.3	277.6	4.7
SL-LT-Zr3-8	104	242	13	0.43	0.053 1	0.002 3	0.322 2	0.013 6	0.044 1	0.000 5	331.5	96.3	283.6	10.5	278.4	3.2
SL-LT-Zr3-9	264	572	30	0.46	0.054 1	0.001 9	0.327 2	0.013 0	0.043 9	0.000 8	372.3	75.0	287.4	9.9	277.1	4.8
SL-LT-Zr3-10^*	204	508	28	0.40	0.057 1	0.002 3	0.346 3	0.013 5	0.044 2	0.000 6	494.5	91.7	301.9	10.2	278.7	3.9
SL-LT-Zr3-11	487	966	54	0.50	0.051 3	0.001 5	0.308 9	0.009 3	0.043 8	0.000 4	257.5	68.5	273.4	7.2	276.0	2.8
SL-LT-Zr3-12	486	953	53	0.51	0.054 5	0.001 9	0.320 6	0.011 6	0.042 8	0.000 5	394.5	77.8	282.4	8.9	269.9	3.3

图5 索伦山蛇绿岩中玄武岩((a),样品SL-PM2-Zr2)和辉长岩((b),样品SL-LT-Zr3)锆石CL图像(年龄单位:Ma)

Fig.5 Representative CL images of zircons from the basalts ((a), sample SL-PM2-Zr2) and gabbros ((b), sample SL-LT-Zr3) in the Solonker ophiolite(age unit:Ma)

图6 索伦山蛇绿岩中玄武岩(样品SL-PM2-Zr2)锆石稀土元素球粒陨石标准化配分曲线(a)和锆石U-Pb年龄谐和图((b)、(c)、(d))

Fig.6 Chondrite-normalized REE patterns (a) and concordia U-Pb diagrams ((b), (c) and (d)) of zircons from the basalts(sample SL-PM2-Zr2) in the Solonker ophiolite

图7 索伦山蛇绿岩中辉长岩(样品SL-LT-Zr3)锆石稀土元素球粒陨石标准化配分曲线(a)和锆石U-Pb年龄谐和图(b)

Fig.7 Chondrite-normalized REE patterns (a) and concordia U-Pb diagram (b) of zircons from gabbros (sample SL-LT-Zr3) in the Solonker ophiolite

表2 索伦山蛇绿岩中玄武岩和辉长岩主量元素(%)、稀土元素(10-6)和微量元素(10-6)分析结果

Table 2 Major(%), rare earth(10-6)and trace element(10-6)contents of basalts and gabbros in the Solonker ophiolite

样品编号		岩性		SiO₂				TiO₂				Al₂O₃		Fe₂ $O 3 T$			MnO			MgO		CaO			Na₂O			K₂O			P₂O₅			烧矢量			总量			Mg^#			FeO^T
SL-LT22-1		辉长岩		44.22				0.51				17.77		9.37			0.15			9.38		15.03			0.53			0.31			0.02			2.13			99.40			63			8.43
SL-LT22-2		辉长岩		44.35				0.63				17.19		11.06			0.16			10.36		12.74			0.69			0.31			0.03			2.73			100.27			62			9.95
SL-LT22-3		辉长岩		46.41				0.43				16.29		9.58			0.16			10.23		14.28			0.41			0.67			0.03			2.19			100.68			65			8.62
SL-LT22-4		辉长岩		45.43				0.46				18.25		8.60			0.14			8.84		13.29			0.55			1.24			0.08			2.18			99.05			64			7.74
SL-LT22-21		辉长岩		47.26				0.49				13.97		8.50			0.13			8.46		18.47			0.17			0.05			0.05			1.82			99.36			63			7.65
SL-LT22-22		辉长岩		46.30				0.44				15.98		8.55			0.14			9.31		17.20			0.11			0.05			0.05			1.99			100.12			65			7.69
SL-LT22-23		辉长岩		46.15				0.50				15.03		8.67			0.13			9.29		17.14			0.12			0.04			0.05			2.34			99.46			65			7.80
SL-PM2-13		玄武岩		50.79				1.19				15.14		11.03			0.16			6.45		10.76			2.76			0.23			0.07			1.66			100.26			50			9.92
SL-PM2-15		玄武岩		51.17				1.39				13.45		11.56			0.16			6.30		10.58			3.37			0.10			0.10			1.65			99.83			48			10.40
SL-PM2-17		玄武岩		51.94				1.32				13.85		11.53			0.16			5.98		9.81			3.53			0.11			0.10			1.47			99.80			47			10.38
SL-PM2-26		玄武岩		47.75				1.03				19.83		10.31			0.14			3.64		9.94			3.45			0.89			0.44			2.10			99.51			38			9.27
SL-PM2-28		玄武岩		47.86				0.97				18.84		9.90			0.24			3.53		11.33			2.96			0.97			0.14			2.82			99.54			38			8.91
SL-PM2-29		玄武岩		50.57				1.11				17.02		9.70			0.16			4.58		10.37			3.96			0.30			0.19			1.64			99.60			45			8.73
SL-PM3-1		玄武岩		50.21				1.18				14.63		11.39			0.18			5.51		11.23			3.26			0.52			0.09			1.40			99.59			45			10.25
SL-PM3-4		玄武岩		48.81				1.20				15.44		11.95			0.20			5.25		11.42			3.14			0.51			0.13			1.92			99.96			43			10.75
SL-PM3-8		玄武岩		48.81				1.10				14.83		11.52			0.18			6.06		12.13			2.43			0.86			0.08			1.78			99.78			48			10.37
SL-PM3-16		玄武岩		48.33				1.12				15.19		11.11			0.17			4.56		12.46			2.85			0.39			0.11			3.24			99.54			41			10.00
样品编号		岩性		Cr				V				Rb		Ba			Th			U		Ta			Nb			Sr			Hf			Zr			Y			La			Ce
SL-LT22-1		辉长岩		396		326			6.69				1 306.00				0.06			0.13		0.06			0.61			450.00			0.70			20.10			14.30			1.25			4.16
SL-LT22-2		辉长岩		382		444			8.49				175.00				0.08			0.16		0.05			0.60			140.00			0.74			21.20			13.70			1.30			4.19
SL-LT22-3		辉长岩		455		319			21.40				554.00				0.04			0.07		0.06			0.56			122.00			0.67			19.40			12.00			1.34			4.14
SL-LT22-4		辉长岩		270		291			35.20				1 764.00				0.04			0.08		0.06			0.50			276.00			0.62			17.40			12.60			1.27			4.04
SL-LT22-21		辉长岩		447		276			0.61				28.80				0.26			0.14		0.12			0.66			88.60			0.80			26.40			14.20			1.69			4.23
SL-LT22-22		辉长岩		519		255			0.58				37.00				0.41			0.28		0.12			0.74			99.60			0.91			36.00			14.20			1.91			4.60
SL-LT22-23		辉长岩		535		265			0.70				21.50				0.40			0.24		0.11			0.76			78.60			0.91			29.70			16.60			2.00			4.93
SL-PM2-13		玄武岩		375		299			5.89				54.70				0.06			0.21		0.13			0.99			260.00			1.93			64.20			37.90			2.00			7.28
SL-PM2-15		玄武岩		186		342			2.05				26.80				0.09			0.29		0.16			1.57			109.00			1.99			55.80			44.70			2.50			8.92
SL-PM2-17		玄武岩		184		316			2.07				20.90				0.08			0.16		0.15			1.55			108.00			1.92			47.90			43.60			2.46			8.45
SL-PM2-26		玄武岩		262		348			23.60				97.00				0.07			0.54		0.10			0.96			175.00			1.63			48.70			73.90			3.28			6.92
SL-PM2-28		玄武岩		315		361			23.60				71.20				0.07			0.18		0.10			0.92			165.00			1.60			44.30			62.20			3.06			6.49
SL-PM2-29		玄武岩		270		317			7.14				37.30				0.06			0.16		0.14			0.91			133.00			1.61			46.70			57.10			2.41			6.73
SL-PM3-1		玄武岩		229		411			12.20				33.10				0.10			0.27		0.20			1.54			198.00			2.44			120.00			44.90			2.36			7.94
SL-PM3-4		玄武岩		202		391			16.40				33.70				0.10			0.57		0.18			1.57			188.00			2.49			122.00			47.50			2.57			8.05
SL-PM3-8		玄武岩		353		387			26.80				47.50				0.11			0.22		0.15			1.48			226.00			2.60			131.00			45.50			2.46			8.15
SL-PM3-16		玄武岩		323		327			9.28				30.70				0.10			0.36		0.17			1.48			85.20			2.51			123.00			43.40			2.50			8.11
样品编号		岩性		Pr			Nd				Sm		Eu			Gd			Tb		Dy		Ho			Er			Tm			Yb			Lu			ΣREE				(La/Yb)_N
SL-LT22-1		辉长岩		0.72			4.14				1.34		0.65			1.68			0.29		1.89		0.39			1.20			0.16			1.13			0.17			19.17				0.79
SL-LT22-2		辉长岩		0.69			3.95				1.26		0.44			1.62			0.28		1.81		0.39			1.15			0.16			1.06			0.16			18.47				0.88
SL-LT22-3		辉长岩		0.68			3.80				1.15		0.51			1.37			0.23		1.52		0.32			0.98			0.14			0.95			0.15			17.27				1.01
SL-LT22-4		辉长岩		0.67			3.88				1.22		0.60			1.52			0.26		1.66		0.35			1.04			0.15			0.96			0.15			17.76				0.95
SL-LT22-21		辉长岩		0.61			3.38				1.13		0.43			1.49			0.27		1.77		0.39			1.17			0.17			1.13			0.17			18.03				1.07
SL-LT22-22		辉长岩		0.64			3.42				1.10		0.43			1.49			0.26		1.78		0.39			1.20			0.17			1.18			0.18			18.75				1.16
SL-LT22-23		辉长岩		0.72			3.95				1.28		0.47			1.72			0.31		2.02		0.44			1.33			0.19			1.27			0.20			20.83				1.13
SL-PM2-13		玄武岩		1.32			8.11				2.85		1.07			3.85			0.69		4.48		0.95			2.77			0.37			2.46			0.35			38.55				0.58
SL-PM2-15		玄武岩		1.59			9.75				3.41		1.27			4.45			0.79		5.09		1.05			3.00			0.40			2.52			0.35			45.10				0.71
样品编号	岩性		Pr		Nd					Sm			Eu		Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			ΣREE		(La/Yb)_N
SL-PM2-17	玄武岩		1.55		9.54					3.39			1.22		4.43			0.80			5.09			1.05			2.96			0.40			2.39			0.31			44.03		0.74
SL-PM2-26	玄武岩		1.54		9.56					3.38			1.20		4.88			0.87			6.04			1.36			4.19			0.59			3.85			0.59			48.25		0.61
SL-PM2-28	玄武岩		1.52		9.42					3.30			1.26		4.66			0.83			5.58			1.24			3.64			0.49			3.12			0.46			45.07		0.70
SL-PM2-29	玄武岩		1.33		8.42					3.04			1.13		4.24			0.77			5.19			1.16			3.50			0.48			3.11			0.45			41.96		0.56
SL-PM3-1	玄武岩		1.37		8.38					3.02			1.10		4.13			0.75			4.94			1.04			3.15			0.44			2.91			0.44			41.97		0.58
SL-PM3-4	玄武岩		1.41		8.61					3.04			1.10		4.14			0.75			5.01			1.08			3.28			0.46			3.02			0.45			42.98		0.61
SL-PM3-8	玄武岩		1.41		8.67					3.06			1.11		4.12			0.74			4.96			1.07			3.17			0.45			2.91			0.45			42.73		0.61
SL-PM3-16	玄武岩		1.39		8.39					2.97			1.08		3.99			0.72			4.68			1.02			3.06			0.43			2.84			0.43			41.61		0.63

表2 索伦山蛇绿岩中玄武岩和辉长岩主量元素(%)、稀土元素(10-6)和微量元素(10-6)分析结果

Table 2 Major(%), rare earth(10-6)and trace element(10-6)contents of basalts and gabbros in the Solonker ophiolite

样品编号		岩性		SiO₂				TiO₂				Al₂O₃		Fe₂ $O 3 T$			MnO			MgO		CaO			Na₂O			K₂O			P₂O₅			烧矢量			总量			Mg^#			FeO^T
SL-LT22-1		辉长岩		44.22				0.51				17.77		9.37			0.15			9.38		15.03			0.53			0.31			0.02			2.13			99.40			63			8.43
SL-LT22-2		辉长岩		44.35				0.63				17.19		11.06			0.16			10.36		12.74			0.69			0.31			0.03			2.73			100.27			62			9.95
SL-LT22-3		辉长岩		46.41				0.43				16.29		9.58			0.16			10.23		14.28			0.41			0.67			0.03			2.19			100.68			65			8.62
SL-LT22-4		辉长岩		45.43				0.46				18.25		8.60			0.14			8.84		13.29			0.55			1.24			0.08			2.18			99.05			64			7.74
SL-LT22-21		辉长岩		47.26				0.49				13.97		8.50			0.13			8.46		18.47			0.17			0.05			0.05			1.82			99.36			63			7.65
SL-LT22-22		辉长岩		46.30				0.44				15.98		8.55			0.14			9.31		17.20			0.11			0.05			0.05			1.99			100.12			65			7.69
SL-LT22-23		辉长岩		46.15				0.50				15.03		8.67			0.13			9.29		17.14			0.12			0.04			0.05			2.34			99.46			65			7.80
SL-PM2-13		玄武岩		50.79				1.19				15.14		11.03			0.16			6.45		10.76			2.76			0.23			0.07			1.66			100.26			50			9.92
SL-PM2-15		玄武岩		51.17				1.39				13.45		11.56			0.16			6.30		10.58			3.37			0.10			0.10			1.65			99.83			48			10.40
SL-PM2-17		玄武岩		51.94				1.32				13.85		11.53			0.16			5.98		9.81			3.53			0.11			0.10			1.47			99.80			47			10.38
SL-PM2-26		玄武岩		47.75				1.03				19.83		10.31			0.14			3.64		9.94			3.45			0.89			0.44			2.10			99.51			38			9.27
SL-PM2-28		玄武岩		47.86				0.97				18.84		9.90			0.24			3.53		11.33			2.96			0.97			0.14			2.82			99.54			38			8.91
SL-PM2-29		玄武岩		50.57				1.11				17.02		9.70			0.16			4.58		10.37			3.96			0.30			0.19			1.64			99.60			45			8.73
SL-PM3-1		玄武岩		50.21				1.18				14.63		11.39			0.18			5.51		11.23			3.26			0.52			0.09			1.40			99.59			45			10.25
SL-PM3-4		玄武岩		48.81				1.20				15.44		11.95			0.20			5.25		11.42			3.14			0.51			0.13			1.92			99.96			43			10.75
SL-PM3-8		玄武岩		48.81				1.10				14.83		11.52			0.18			6.06		12.13			2.43			0.86			0.08			1.78			99.78			48			10.37
SL-PM3-16		玄武岩		48.33				1.12				15.19		11.11			0.17			4.56		12.46			2.85			0.39			0.11			3.24			99.54			41			10.00
样品编号		岩性		Cr				V				Rb		Ba			Th			U		Ta			Nb			Sr			Hf			Zr			Y			La			Ce
SL-LT22-1		辉长岩		396		326			6.69				1 306.00				0.06			0.13		0.06			0.61			450.00			0.70			20.10			14.30			1.25			4.16
SL-LT22-2		辉长岩		382		444			8.49				175.00				0.08			0.16		0.05			0.60			140.00			0.74			21.20			13.70			1.30			4.19
SL-LT22-3		辉长岩		455		319			21.40				554.00				0.04			0.07		0.06			0.56			122.00			0.67			19.40			12.00			1.34			4.14
SL-LT22-4		辉长岩		270		291			35.20				1 764.00				0.04			0.08		0.06			0.50			276.00			0.62			17.40			12.60			1.27			4.04
SL-LT22-21		辉长岩		447		276			0.61				28.80				0.26			0.14		0.12			0.66			88.60			0.80			26.40			14.20			1.69			4.23
SL-LT22-22		辉长岩		519		255			0.58				37.00				0.41			0.28		0.12			0.74			99.60			0.91			36.00			14.20			1.91			4.60
SL-LT22-23		辉长岩		535		265			0.70				21.50				0.40			0.24		0.11			0.76			78.60			0.91			29.70			16.60			2.00			4.93
SL-PM2-13		玄武岩		375		299			5.89				54.70				0.06			0.21		0.13			0.99			260.00			1.93			64.20			37.90			2.00			7.28
SL-PM2-15		玄武岩		186		342			2.05				26.80				0.09			0.29		0.16			1.57			109.00			1.99			55.80			44.70			2.50			8.92
SL-PM2-17		玄武岩		184		316			2.07				20.90				0.08			0.16		0.15			1.55			108.00			1.92			47.90			43.60			2.46			8.45
SL-PM2-26		玄武岩		262		348			23.60				97.00				0.07			0.54		0.10			0.96			175.00			1.63			48.70			73.90			3.28			6.92
SL-PM2-28		玄武岩		315		361			23.60				71.20				0.07			0.18		0.10			0.92			165.00			1.60			44.30			62.20			3.06			6.49
SL-PM2-29		玄武岩		270		317			7.14				37.30				0.06			0.16		0.14			0.91			133.00			1.61			46.70			57.10			2.41			6.73
SL-PM3-1		玄武岩		229		411			12.20				33.10				0.10			0.27		0.20			1.54			198.00			2.44			120.00			44.90			2.36			7.94
SL-PM3-4		玄武岩		202		391			16.40				33.70				0.10			0.57		0.18			1.57			188.00			2.49			122.00			47.50			2.57			8.05
SL-PM3-8		玄武岩		353		387			26.80				47.50				0.11			0.22		0.15			1.48			226.00			2.60			131.00			45.50			2.46			8.15
SL-PM3-16		玄武岩		323		327			9.28				30.70				0.10			0.36		0.17			1.48			85.20			2.51			123.00			43.40			2.50			8.11
样品编号		岩性		Pr			Nd				Sm		Eu			Gd			Tb		Dy		Ho			Er			Tm			Yb			Lu			ΣREE				(La/Yb)_N
SL-LT22-1		辉长岩		0.72			4.14				1.34		0.65			1.68			0.29		1.89		0.39			1.20			0.16			1.13			0.17			19.17				0.79
SL-LT22-2		辉长岩		0.69			3.95				1.26		0.44			1.62			0.28		1.81		0.39			1.15			0.16			1.06			0.16			18.47				0.88
SL-LT22-3		辉长岩		0.68			3.80				1.15		0.51			1.37			0.23		1.52		0.32			0.98			0.14			0.95			0.15			17.27				1.01
SL-LT22-4		辉长岩		0.67			3.88				1.22		0.60			1.52			0.26		1.66		0.35			1.04			0.15			0.96			0.15			17.76				0.95
SL-LT22-21		辉长岩		0.61			3.38				1.13		0.43			1.49			0.27		1.77		0.39			1.17			0.17			1.13			0.17			18.03				1.07
SL-LT22-22		辉长岩		0.64			3.42				1.10		0.43			1.49			0.26		1.78		0.39			1.20			0.17			1.18			0.18			18.75				1.16
SL-LT22-23		辉长岩		0.72			3.95				1.28		0.47			1.72			0.31		2.02		0.44			1.33			0.19			1.27			0.20			20.83				1.13
SL-PM2-13		玄武岩		1.32			8.11				2.85		1.07			3.85			0.69		4.48		0.95			2.77			0.37			2.46			0.35			38.55				0.58
SL-PM2-15		玄武岩		1.59			9.75				3.41		1.27			4.45			0.79		5.09		1.05			3.00			0.40			2.52			0.35			45.10				0.71
样品编号	岩性		Pr		Nd					Sm			Eu		Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			ΣREE		(La/Yb)_N
SL-PM2-17	玄武岩		1.55		9.54					3.39			1.22		4.43			0.80			5.09			1.05			2.96			0.40			2.39			0.31			44.03		0.74
SL-PM2-26	玄武岩		1.54		9.56					3.38			1.20		4.88			0.87			6.04			1.36			4.19			0.59			3.85			0.59			48.25		0.61
SL-PM2-28	玄武岩		1.52		9.42					3.30			1.26		4.66			0.83			5.58			1.24			3.64			0.49			3.12			0.46			45.07		0.70
SL-PM2-29	玄武岩		1.33		8.42					3.04			1.13		4.24			0.77			5.19			1.16			3.50			0.48			3.11			0.45			41.96		0.56
SL-PM3-1	玄武岩		1.37		8.38					3.02			1.10		4.13			0.75			4.94			1.04			3.15			0.44			2.91			0.44			41.97		0.58
SL-PM3-4	玄武岩		1.41		8.61					3.04			1.10		4.14			0.75			5.01			1.08			3.28			0.46			3.02			0.45			42.98		0.61
SL-PM3-8	玄武岩		1.41		8.67					3.06			1.11		4.12			0.74			4.96			1.07			3.17			0.45			2.91			0.45			42.73		0.61
SL-PM3-16	玄武岩		1.39		8.39					2.97			1.08		3.99			0.72			4.68			1.02			3.06			0.43			2.84			0.43			41.61		0.63

图8 索伦山蛇绿岩中玄武岩和辉长岩TAS分类图解(a)和SiO2-FeOT/MgO判别图解(b)(底图分别据文献[31]和[32])

Fig.8 TAS classification diagram (a) and SiO2-FeOT/MgO discrimination diagram (b) for basalts and gabbros in the Solonker ophiolite (base map after ref.[31] and [32], respectively)

图9 索伦山蛇绿岩中玄武岩和辉长岩稀土元素球粒陨石标准化配分曲线((a)、(c))和微量元素N-MORB标准化蛛网图((b)、(d))(N-MORB、E-MORB及OIB数据来源于文献[28],IAB数据源自文献[33])

Fig.9 Chondrite-normalized REE patterns ((a) and (c)) and N-MORB-normalized trace element spidergrams ((b) and (d)) of basalts and gabbros in the Solonker ophiolite

图10 索伦山蛇绿岩中玄武岩和辉长岩的哈克图解

Fig.10 Harker diagrams for basalts and gabbros in the Solonker ophiolite

图11 索伦山蛇绿岩中玄武岩和辉长岩Sm-Sm/Yb图解(a)和Th/Nb-U/Th图解(b)(底图据文献[41,44];尖晶石二辉橄榄岩、石榴子石二辉橄榄岩和石榴子石+尖晶石二辉橄榄岩数据引自文献[44];DMM(亏损地幔)、PM(原始地幔)、N-MORB(正常洋脊玄武岩)、WAM(安纳托利亚西部地幔)和E-MORB(富集洋脊玄武岩)数据引自文献[44]及其参考文献;DM(亏损地幔)、UCC(上大陆地壳)、LCC(下大陆地壳)、OIB(洋岛玄武岩)和GLOSS(全球俯冲沉积物)数据引自[41]及其参考文献)

Fig.11 Sm-Sm/Yb diagram (a) and Th/Nb-U/Th diagram (b) of the basalts and gabbros in the Solonker ophiolite

图12 索伦山蛇绿岩中玄武岩2Nb-Zr/4-Y(a)、Zr-Zr/Y(b)、Ta/Yb-Th/Yb(c)和Ti/1000-V(d)图解(底图据文献[47,48,49,50]) 玄武岩(1)和(2)的数据来源于文献[21,23];N-MORB.正常洋脊玄武岩;E-MORB.富集洋脊玄武岩;WPB.板内玄武岩;WPT.板内拉斑玄武岩;WPAB.板内碱性玄武岩;IAB.岛弧玄武岩;IAT.岛弧拉斑玄武岩;ICA.岛弧钙碱性玄武岩;CAB.钙碱性玄武岩;SHO.钾玄岩;TH.拉斑玄武岩;TR.过渡玄武岩;ALK.碱性玄武岩;OIB.洋岛玄武岩;AB.碱性玄武岩;CFB.大陆溢流玄武岩

Fig.12 Tectonic discrimination diagrams of 2Nb-Zr/4-Y (a), Zr-Zr/Y(b), Ta/Yb-Th/Yb(c), and Ti/1000-V (d) of basalts in the Solonker ophiolite

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内蒙古索伦山蛇绿岩锆石U-Pb年代学、地球化学特征及其地质意义

Zircon U-Pb Geochronology, Geochemistry Characteristics and Geological Significance of the Solonker Ophiolite, Inner Mongolia

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