东昆仑祁漫塔格晚古生代末期幔源岩浆活动成因及地质意义:以鹰爪沟岩体为例

胡朝斌; 李猛; 查显锋; 高晓峰; 李婷

doi:10.3799/dqkx.2018.120

东昆仑祁漫塔格晚古生代末期幔源岩浆活动成因及地质意义:以鹰爪沟岩体为例

doi: 10.3799/dqkx.2018.120

胡朝斌^1,3,,
李猛^1,2,
查显锋^1,2,
高晓峰^1,2,
李婷^1,2

1.
中国地质调查局西安地质调查中心, 造山带地质研究中心, 陕西西安 710054
2.
自然资源部岩浆作用成矿与找矿重点实验室, 陕西西安 710054
3.
中国地质科学院矿产资源研究所, 北京 100037

基金项目:

中国地质调查局项目 DD20160002

国家自然科学基金项目 41602005

国家科技支撑专题 2015BAB05B01-01

详细信息

作者简介:
胡朝斌(1990-), 男, 助理工程师, 主要从事岩石学和地球化学研究

中图分类号: P59
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-07
- 刊出日期: 2018-12-15

Genesis and Geological Significance of Late Paleozoic Mantle-Derived Magmatism in Qimantag, East Kunlun: A Case Study of Intrusion in Yingzhuagou

Hu Chaobin^{1,3
,},
Li Meng^1,2,
Zha Xianfeng^1,2,
Gao Xiaofeng^1,2,
Li Ting^1,2

1.
Xi'an Center of Geological Survey, Orogen Research Center, China Geological Survey, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an 710054, China
3.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 幔源岩浆活动的成因研究，对约束区域构造演化历史具有重要意义.东昆仑祁漫塔格鹰爪沟镁铁-超镁铁质层状岩体由橄榄辉长苏长岩、含长橄榄二辉岩及橄榄二辉岩组成.获得橄榄辉长苏长岩的LA-ICP-MS锆石U-Pb年龄为263±4 Ma，指示岩体形成于中二叠世晚期.岩石地球化学特征显示，鹰爪沟岩体具有低SiO₂、高MgO、FeO_t含量，富集LREE、LILE，亏损HREE以及Th、U、Nb、Ta、Ti等不相容元素等特征.全岩ε_Nd（t）=0.73~0.92，锆石ε_Hf（t）=8.33~13.50.综合区域地质背景资料，认为其形成于古特提斯洋俯冲作用下的活动大陆边缘裂谷，源自于受软流圈熔体和俯冲流体交代的岩石圈地幔.结合同期具有壳幔混源特征的花岗岩资料，认为东昆仑地区在中二叠世已有幔源岩浆底侵活动，主要形成于古特提斯洋俯冲体制下局部的伸展背景.
- 祁漫塔格 /
- 中二叠世 /
- 镁铁-超镁铁质岩 /
- 交代岩石圈地幔 /
- 幔源岩浆底侵 /
- 地球化学
Abstract: The study of the origin of mantle-derived magmatism is of great significance to the tectonic evolution history. Located in the Yingzhuagou area of Qimantag, East Kunlun, the mafic-ultramafic layered intrusion consists of olivine gabbro-norite, feldspar-olivine websterite and olivine websterite.The LA-ICP-MS zircon U-Pb dating results suggest that the olivine gabbro-norite intruded at 263±4 Ma, belonging to late Middle Permian. All the rocks are characterized by low SiO₂, high MgO and FeO_t, enrichment of LREE and LILE, depletion of HREE and incompatible elements (e.g.Th, U, Nb, Ta, Ti). ε_Nd(t)=0.73-0.92, ε_Hf(t)=8.33-13.50. Based on the regional geological background, it is suggested that the rocks were formed in an active continental margin rift setting with the subduction of Paleo-Tethys Ocean. The magma came from the lithospheric mantle metasomatized by subduction fluid and asthenosphere melt. Combining the data of granite that originated from mixing of crustal and mantle materials in the same period, it is concluded that underplating of mantle-derived magmas should have started before Middle Permian in East Kunlun area and should have been controlled by the regional extensional setting in the subduction of Paleo-Tethys Ocean.
- Qimantag /
- Middle Permian /
- mafic-ultramafic rock /
- lithospheric mantle metasomatism /
- underplating of mantle-derived magma /
- geochemistry

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图 1 研究区构造位置图(a)、祁漫塔格区域(b)、阿达滩北缘岩体(c)和鹰爪沟岩体(d)地质简图

Fig. 1. Tectonic location map of the study area (a), simplified geological maps of Qimantag (b), rock masses in the northern margin of Adatan region (c) and Yingzhuagou (d)

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图 2 鹰爪沟镁铁-超镁铁质层状岩体野外宏观特征

a.石英闪长岩中的暗色包体; b.橄榄辉长苏长岩露头; c.中粒橄榄辉长苏长岩; d.橄榄二辉岩差异风化特征; e、f.层状分异特征; g.岩体宏观出露特征

Fig. 2. Photographs of rock in Yingzhuagou mafic-ultramafic layered intrusion

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图 3 显微镜下照片

a.橄榄辉长苏长岩(+); b.橄榄二辉岩(+).Ol.橄榄石; Opx.斜方辉石; Cpx.单斜辉石; Phl.金云母; Hb.普通角闪石

Fig. 3. Microphotographs of the rocks

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图 4 锆石阴极发光图像

Fig. 4. CL images of zircons

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图 5 锆石U-Pb年龄谐和图(a)和锆石加权年龄图(b)

Fig. 5. Zircon U-Pb concordia diagram (a) and zircon weighted average age diagram (b)

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图 6 硅碱图(a)和FeO_t-FeO_t/MgO图解(b)

Fig. 6. SiO₂-K₂O+Na₂O (a) and FeO_t-FeO_t/MgO diagrams (b)

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图 7 稀土元素球粒陨石标准化配分模式图(a)和微量元素原始地幔标准化蛛网图(b)

标准化值据Sun and McDonough(1989)

Fig. 7. Chondrite-normalized REE patterns (a) and primitive mantle-normalized spider plots of trace elements (b) of samples

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图 8 La/Ba-La/Nb (a)、(Tb/Yb)_N-(La/Sm)_N (b)、Ba/La-Th/Yb (c)和Ba/Th-Th/Nb(d)图解

Fig. 8. La/Ba-La/Nb (a), (Tb/Yb)_N-(La/Sm)_N (b), Ba/La-Th/Yb (c) and Ba/Th-Th/Nb (d) diagrams

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图 9 Ta /Yb-Th/Yb(a)、Th/Zr-Ce /Pb (b)、Ba/La-Mg^#(c)和Th/Nb-Mg^#(d)图解

Fig. 9. Ta /Yb-Th/Yb (a), Th/Zr-Ce /Pb (b), Ba/La-Mg^# (c) and Th/Nb-Mg^# (d) diagrams

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图 10 Th/Yb-Ta/Yb(a)、Nb×2-Zr/4-Y(b)和Hf/3-Th-Ta(c)图解

b.板内碱性玄武岩=A1+A2;板内拉斑玄武岩=A2+C; P-MORB=B; N-MORB=D; 火山弧玄武岩=C.c.A=N-MORB; B=E-MORB; C=WPB; D=DPMB

Fig. 10. Th/Yb-Ta/Yb (a), Nb×2-Zr/4-Y (b) and Hf/3-Th-Ta (c) diagrams

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表 1 锆石U-Pb同位素分析结果

Table 1. Zircon U-Pb isotopic analysis compositions

编号	同位素比值								年龄(Ma)								Th/U	含量(10^-6)			谐和度
编号	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	Th/U	U	Th	Pb	谐和度
038D301	0.050 6	0.002 9	0.287 6	0.016 9	0.041 3	0.001 3	0.012 7	0.000 3	221.0	125.77	256.7	13.33	260.7	8.01	254.3	6.26	2.56	276.50	706.63	78.52	0.98
039D302	0.052 5	0.004 6	0.301 1	0.026 4	0.041 6	0.001 4	0.012 6	0.000 4	308.0	187.02	267.3	20.64	262.8	8.78	253.0	7.47	2.24	151.68	340.28	45.33	1.02
040D303	0.050 9	0.003 3	0.294 4	0.019 4	0.042 0	0.001 3	0.012 4	0.000 3	236.4	141.78	262.0	15.23	265.0	8.30	248.5	6.42	2.47	223.37	551.27	73.69	0.99
041D304	0.060 4	0.007 6	0.325 0	0.040 8	0.039 0	0.001 5	0.011 8	0.000 5	619.5	250.81	285.8	31.23	246.8	9.07	237.1	10.39	1.53	60.95	93.11	20.76	1.16
042D305	0.051 9	0.004 0	0.298 2	0.023 1	0.041 7	0.001 4	0.011 6	0.000 4	278.8	165.29	2 650.0	18.04	263.6	8.39	233.2	6.97	1.73	181.41	314.47	42.20	1.01
046D306	0.052 1	0.005 2	0.295 3	0.029 4	0.041 2	0.001 4	0.010 9	0.000 4	289.0	211.17	262.7	23.02	260.0	8.63	219.7	8.46	1.21	130.11	157.66	28.11	1.01
047D307	0.050 4	0.004 0	0.291 1	0.023 2	0.041 9	0.001 4	0.012 3	0.000 4	212.4	172.70	259.4	18.25	264.8	8.49	246.9	7.38	1.64	180.75	296.77	42.22	0.98
048D308	0.057 7	0.009 9	0.333 8	0.056 7	0.042 0	0.001 7	0.014 0	0.000 7	517.3	336.77	292.4	43.14	265.2	10.32	249.0	13.91	1.39	53.79	74.79	12.33	1.10
049D309	0.048 6	0.006 8	0.283 5	0.039 3	0.042 3	0.001 5	0.010 6	0.000 5	129.2	297.43	253.4	31.07	267.2	9.54	213.7	9.76	1.38	73.13	100.83	16.37	0.95
050D310	0.051 9	0.006 3	0.300 3	0.036 1	0.042 0	0.001 5	0.011 9	0.000 5	279.4	254.23	266.7	28.18	265.4	9.51	239.6	9.31	1.62	101.01	163.67	34.96	1.00
052D311	0.072 3	0.006 4	0.422 0	0.037 1	0.042 4	0.001 5	0.013 7	0.000 5	994.5	169.74	357.5	26.52	267.4	9.38	274.6	10.21	1.42	124.02	176.56	49.94	1.34
053D312	0.052 9	0.003 5	0.303 6	0.020 6	0.041 7	0.001 3	0.011 7	0.000 3	322.4	143.75	269.2	16.06	263.3	8.31	235.9	6.47	2.18	248.02	541.31	73.41	1.02
054D313	0.052 5	0.003 8	0.299 5	0.022 2	0.041 4	0.001 4	0.012 0	0.000 3	306.3	157.63	266.0	17.35	261.6	8.36	241.0	6.71	2.19	186.15	408.11	59.27	1.02
055D314	0.049 8	0.004 7	0.279 5	0.026 6	0.040 8	0.001 4	0.012 5	0.000 4	183.9	206.36	250.2	21.10	257.6	8.40	251.3	8.52	1.27	136.08	172.55	37.71	0.97
056D315	0.053 3	0.004 2	0.302 8	0.024 0	0.041 3	0.001 4	0.012 0	0.000 4	340.8	167.74	268.6	18.69	260.6	8.39	240.2	7.43	1.62	167.28	271.54	47.81	1.03
060D316	0.051 9	0.007 0	0.296 7	0.040 0	0.041 5	0.001 6	0.013 0	0.000 6	282.7	283.27	263.8	31.29	261.9	9.65	260.0	11.00	1.54	94.21	144.85	35.62	1.01
061D317	0.052 5	0.006 2	0.304 1	0.035 6	0.042 0	0.001 5	0.013 9	0.000 6	308.7	247.61	269.6	27.72	265.3	9.51	278.1	11.00	1.36	119.52	162.32	42.03	1.02
062D318	0.047 9	0.007 3	0.271 2	0.041 1	0.041 1	0.001 5	0.012 2	0.000 5	95.0	326.63	243.6	32.86	259.4	9.55	244.1	10.68	1.39	68.09	94.63	22.17	0.94
063D319	0.051 7	0.012 3	0.291 0	0.068 6	0.040 9	0.001 8	0.013 9	0.000 8	271.1	468.03	259.4	53.95	258.3	10.94	279.6	15.78	1.30	51.22	66.40	21.86	1.00
064D320	0.051 7	0.004 9	0.295 3	0.028 2	0.041 4	0.001 4	0.012 6	0.000 5	273.9	203.58	262.7	22.07	261.7	8.74	253.9	8.95	1.44	119.14	172.01	36.33	1.00
066D321	0.050 5	0.004 0	0.292 2	0.023 2	0.042 0	0.001 4	0.014 1	0.000 5	217.9	171.81	260.3	18.20	265.2	8.48	283.3	10.00	0.78	183.97	144.03	47.76	0.98
067D322	0.053 7	0.005 1	0.307 1	0.029 5	0.041 5	0.001 4	0.011 9	0.000 5	356.5	203.16	271.9	22.92	262.4	8.80	238.3	9.22	1.30	138.81	179.86	46.95	1.04
068D323	0.051 6	0.004 8	0.303 0	0.028 4	0.042 6	0.001 5	0.013 0	0.000 4	268.3	200.40	268.7	22.11	269.0	9.01	260.5	8.70	1.55	134.38	208.22	39.67	1.00
069D324	0.053 1	0.004 5	0.304 2	0.026 0	0.041 6	0.001 4	0.012 6	0.000 4	334.0	181.65	269.7	20.23	262.6	8.68	253.7	7.79	1.83	176.00	322.07	52.42	1.03
070D325	0.054 2	0.003 9	0.305 5	0.022 3	0.040 9	0.001 3	0.011 6	0.000 4	377.8	153.78	270.7	17.34	258.7	8.21	233.3	6.96	1.66	223.83	371.44	62.79	1.05

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表 2 锆石Hf同位素分析结果

Table 2. Zircon Hf isotopic analysis compositions

样品编号	t(Ma)	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	±2σ	Hf_i	ε_Hf(t)	±1σ	T_DM(Ga)	±1σ	fs
Hf-04-1	260.7	0.027 993	0.001 023	0.282 960	0.000 021 1	0.282 955 457	12.217	0.738	0.414	0.030	-0.969
Hf-04-2	262.8	0.024 318	0.000 881	0.282 892	0.000 023 4	0.282 887 649	9.864	0.819	0.509	0.033	-0.973
Hf-04-3	265.0	0.036 071	0.001 292	0.282 977	0.000 022 2	0.282 970 218	12.834	0.778	0.394	0.032	-0.961
Hf-04-4	246.8	0.013 888	0.000 532	0.282 870	0.000 024 0	0.282 867 210	8.788	0.839	0.536	0.034	-0.984
Hf-04-5	263.6	0.038 423	0.001 373	0.282 970	0.000 024 0	0.282 963 421	12.563	0.841	0.404	0.035	-0.959
Hf-04-6	260.0	0.012 570	0.000 460	0.282 884	0.000 022 6	0.282 881 728	9.593	0.790	0.515	0.032	-0.986
Hf-04-7	264.8	0.048 623	0.001 666	0.283 026	0.000 026 4	0.283 018 076	14.523	0.924	0.326	0.038	-0.950
Hf-04-8	265.2	0.009 791	0.000 366	0.282 845	0.000 022 5	0.282 842 703	8.327	0.786	0.569	0.031	-0.989
Hf-04-9	267.2	0.011 567	0.000 438	0.282 904	0.000 023 9	0.282 902 303	10.480	0.837	0.486	0.033	-0.987
Hf-04-10	265.4	0.023 397	0.000 861	0.282 940	0.000 028 5	0.282 935 303	11.608	0.996	0.442	0.040	-0.974
Hf-04-11	267.4	0.032 006	0.001 150	0.282 922	0.000 028 1	0.282 916 247	10.977	0.982	0.470	0.040	-0.965
Hf-04-12	263.3	0.027 358	0.000 941	0.282 926	0.000 026 4	0.282 921 634	11.078	0.923	0.461	0.037	-0.972
Hf-04-13	261.6	0.054 075	0.001 810	0.283 041	0.000 026 1	0.283 032 054	14.947	0.914	0.306	0.038	-0.945
Hf-04-14	257.6	0.013 925	0.000 501	0.282 897	0.000 022 8	0.282 894 281	9.984	0.799	0.498	0.032	-0.985
Hf-04-15	260.6	0.021 626	0.000 790	0.282 952	0.000 025 9	0.282 947 842	11.946	0.907	0.424	0.037	-0.976
Hf-04-16	261.9	0.015 951	0.000 600	0.282 920	0.000 023 5	0.282 917 002	10.883	0.823	0.466	0.033	-0.982
Hf-04-17	265.3	0.019 917	0.000 751	0.282 930	0.000 029 8	0.282 926 166	11.282	1.042	0.454	0.042	-0.977
Hf-04-18	259.4	0.024 285	0.000 906	0.282 905	0.000 023 3	0.282 900 871	10.257	0.817	0.491	0.033	-0.973
Hf-04-19	258.3	0.020 660	0.000 789	0.282 897	0.000 025 7	0.282 893 322	9.966	0.901	0.501	0.036	-0.976
Hf-04-20	261.7	0.020 204	0.000 769	0.282 867	0.000 025 3	0.282 863 003	8.968	0.886	0.543	0.036	-0.977
Hf-04-21	265.2	0.015 121	0.000 563	0.282 886	0.000 023 2	0.282 883 209	9.760	0.813	0.513	0.033	-0.983
Hf-04-22	262.4	0.028 083	0.001 034	0.282 955	0.000 022 9	0.282 949 531	12.045	0.803	0.422	0.033	-0.969
Hf-04-23	269.0	0.041 886	0.001 530	0.282 994	0.000 023 7	0.282 986 648	13.504	0.829	0.371	0.034	-0.954
Hf-04-24	262.6	0.035 270	0.001 289	0.282 982	0.000 026 6	0.282 975 672	12.974	0.930	0.386	0.038	-0.961
Hf-04-25	258.7	0.011 529	0.000 458	0.282 935	0.000 024 0	0.282 932 690	11.368	0.841	0.443	0.034	-0.986

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表 3 样品全岩主量(%)及微量元素(10^-6)分析结果

Table 3. Major element (%) and trace element (10^-6) analysis data

样品	橄榄辉长苏长岩					含长橄榄二辉岩		橄榄二辉岩
样品	PM04-1-1H	PM04-2-1H	PM04-4-1H	PM04-7-1H	PM04-9-1H	PM04-3-1H	PM04-10-1H	PM04-5-1H	PM04-6-1H	PM04-8-1H
SiO₂	42.52	43.35	45.52	42.87	43.63	41.96	41.40	41.40	41.20	39.97
Al₂O₃	9.36	9.95	11.78	8.96	11.04	6.74	6.78	6.23	7.14	5.77
Fe₂O₃	2.68	2.43	1.23	3.05	2.26	3.46	3.89	2.66	3.25	3.53
FeO	9.06	8.98	9.42	8.22	8.45	8.90	9.45	10.00	8.95	8.65
CaO	4.57	4.71	5.75	4.84	5.26	3.23	3.42	3.71	3.51	2.98
MgO	23.92	23.32	20.44	24.71	22.35	28.18	27.62	28.75	28.02	30.41
K₂O	0.44	0.45	0.47	0.29	0.36	0.41	0.38	0.35	0.32	0.39
Na₂O	1.67	1.92	2.14	1.55	1.99	1.08	1.24	0.89	1.19	0.73
TiO₂	0.63	0.63	0.71	0.60	0.62	0.47	0.61	0.62	0.66	0.28
P₂O₅	0.13	0.14	0.13	0.09	0.12	0.09	0.14	0.10	0.07	0.07
MnO	0.19	0.20	0.20	0.20	0.18	0.20	0.21	0.21	0.20	0.19
H₂O⁺	3.57	2.96	1.62	3.78	2.88	4.58	3.62	3.16	4.46	5.56
灼失量	4.52	3.59	1.95	4.26	3.45	4.89	4.54	4.66	5.08	6.60
Total	99.69	99.67	99.74	99.64	99.71	99.61	99.68	99.58	99.59	99.57
Mg^#	81.39	81.41	80.28	82.54	81.72	83.11	81.73	82.95	83.19	84.36
FeO_t	11.47	11.17	10.53	10.96	10.48	12.01	12.95	12.39	11.87	11.83
Fe₂O_3t	12.75	12.41	11.70	12.18	11.65	13.35	14.39	13.77	13.20	13.14
La	8.52	8.59	8.21	5.27	8.64	6.02	7.34	5.86	4.97	3.49
Ce	19.00	19.10	18.60	12.60	18.50	14.10	16.70	14.50	11.60	8.01
Pr	2.44	2.41	2.43	1.75	2.40	1.80	2.13	2.02	1.52	1.06
Nd	10.20	10.00	10.30	7.96	10.00	7.69	9.16	9.00	6.62	4.40
Sm	2.29	2.37	2.37	2.04	2.37	1.63	2.04	2.25	1.66	1.10
Eu	0.72	0.72	0.80	0.67	0.80	0.52	0.68	0.65	0.58	0.41
Gd	2.02	2.11	2.23	1.92	2.20	1.50	1.99	2.17	1.62	1.00
Tb	0.36	0.35	0.36	0.34	0.38	0.26	0.34	0.36	0.29	0.17
Dy	2.02	1.97	2.06	1.98	2.13	1.54	1.90	2.16	1.66	1.02
Ho	0.40	0.40	0.42	0.39	0.40	0.31	0.37	0.42	0.33	0.20
Er	1.09	1.05	1.16	1.07	1.10	0.86	1.04	1.15	0.91	0.53
Tm	0.16	0.16	0.17	0.16	0.16	0.13	0.16	0.17	0.14	0.08
Yb	1.08	1.06	1.10	1.05	1.06	0.84	0.97	1.10	0.91	0.52
Lu	0.16	0.16	0.17	0.15	0.16	0.12	0.15	0.16	0.14	0.08
Y	10.60	10.10	10.40	9.45	10.20	7.41	9.49	10.60	7.84	4.92
∑REE	61.06	60.55	60.78	46.80	60.50	44.73	54.46	52.57	40.79	26.99
LREE	43.17	43.19	42.71	30.29	42.71	31.76	38.05	34.28	26.95	18.47
HREE	17.89	17.36	18.07	16.51	17.79	12.97	16.41	18.29	13.84	8.52
LREE/HREE	2.41	2.49	2.36	1.83	2.40	2.45	2.32	1.87	1.95	2.17
La_N/Yb_N	5.66	5.81	5.35	3.60	5.85	5.14	5.43	3.82	3.92	4.81
Cu	186	102	61.9	59.5	56.5	100	71.8	41.6	119	53.1
Pb	3.34	3.24	4.00	2.40	3.12	2.76	2.77	2.57	2.36	2.47
Zn	80.6	74.6	80.4	82.3	74.8	89.2	86.8	84.8	87.5	87.2
Cr	1 210	1 150	996	1 570	1 080	1 700	1 210	1 640	1 690	1 780
Ni	851	721	501	578	522	826	720	823	827	982
Co	105	99.0	86.0	99.5	89.0	113	117	111	110	120
Li	6.22	4.96	4.36	6.13	4.67	5.10	6.14	4.11	5.94	4.32
Rb	13.6	8.71	7.35	5.13	12.8	7.52	8.19	5.67	5.24	9.84
Cs	0.34	0.29	0.18	0.20	0.36	0.38	0.64	0.22	0.19	1.20
Sr	387	407	497	337	460	281	275	242	284	240
Ba	136	136	198	106	140	113	199	148	92.7	79.5
V	72.2	71.3	79.1	85.3	66.9	62.9	66.6	83.6	82.2	52.3
Sc	11.0	12.1	13.8	12.8	10.8	10.7	11.7	13.7	11.1	9.06
Nb	3.02	2.99	2.72	2.07	2.43	2.62	2.43	2.39	2.31	1.18
Ta	0.28	0.32	0.26	0.24	0.25	0.26	0.26	0.27	0.27	0.12
Zr	71.2	84.1	67.0	51.4	45.3	55.2	67.2	49.7	51.1	27.3
Hf	1.70	1.87	1.63	1.27	1.18	1.38	1.57	1.32	1.26	0.71
Be	1.02	0.93	0.42	0.64	0.70	0.82	0.84	0.59	0.66	0.64
Ga	8.95	9.22	10.8	9.24	9.78	7.81	7.34	7.28	7.95	5.95
Ge	1.05	1.08	1.01	1.18	1.17	1.35	1.22	1.28	1.17	1.02
U	0.18	0.21	0.12	0.15	0.12	0.12	0.23	0.096	0.089	0.034
Th	1.12	1.22	0.90	0.74	1.10	0.90	1.04	0.72	0.70	0.44
注：FeO_t、Fe₂O_3t表示全铁，Mg^#=100×(Mg²⁺/(Mg²⁺+Fe_t²⁺)，下标N为球粒陨石标准化.

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表 4 全岩Sr-Nd同位素分析结果

Table 4. Sr-Nd isotope analysis data

岩性	编号	T(Ma)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	±2σ	(⁸⁷Sr/⁸⁶Sr)_i	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	±2σ	ε_Nd(t)	T_DM1^Nd(Ga)	T_DM2^Nd(Ga)
含长橄榄二辉岩	PM04-3-1	263	0.077 491	0.706 848	0.000 007	0.706 558	0.128 145	0.512 567	0.000 007	0.92	1.04	0.96
橄榄苏长辉长岩	PM04-4-1	263	0.042 822	0.706 523	0.000 005	0.706 363	0.139 107	0.512 576	0.000 007	0.73	1.17	0.97
橄榄二辉岩	PM04-5-1	263	0.067 843	0.706 781	0.000 007	0.706 527	0.151 140	/	/	/	/	/

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