长江中下游地区燕山晚期基性岩浆活动的记录

孙洋; 马昌前; 刘彬

doi:10.3799/dqkx.2017.077

长江中下游地区燕山晚期基性岩浆活动的记录

doi: 10.3799/dqkx.2017.077

孙洋^1,,
马昌前^2,3, ,,
刘彬¹

1.
长江大学地球科学学院，湖北武汉 430100
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

基金项目:

国家自然科学基金项目 41272079

国家重点基础研究发展计划 2012CB416800

国家自然科学基金项目 41502050

详细信息

作者简介:
孙洋(1985-)，女，讲师，博士，主要从事矿物学、岩石学、矿床学专业研究.ORCID：0000-0002-8811-3020.E-mail：565765032@qq.com

通讯作者:
马昌前，E-mail：cqma@cug.edu.cn

中图分类号: P581
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出版历程
- 收稿日期: 2016-12-02
- 刊出日期: 2017-06-15

Record of Late Yanshanian Mafic Magmatic Activity in the Middle-Lower Yangtze River Metallogenic Belt

Sun Yang^1
,,
Ma Changqian^{2,3
, ,},
Liu Bin¹

1.
School of Geosciences, Yangtze University, Wuhan 430100, 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

摘要

摘要: 江苏省宁镇地区位于长江中下游沿江成矿带的最东端，是长江中下游成矿带的重要组成部分，蒋庙岩体是宁镇地区唯一的基性岩体.对此岩体进行了锆石U-Pb年代学、矿物化学、岩石地球化学和Sr-Nd-Hf同位素研究，讨论了其成因及地幔源区性质.岩体主要由橄榄辉长岩、角闪辉长岩和辉石闪长岩组成，其中辉石闪长岩的锆石LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometry) U-Pb年龄为121±1 Ma.锆石ε_Hf(t)值介于-2.9~-6.4.全岩地球化学研究显示岩石样品富钠低钾，富集轻稀土元素，重稀土元素亏损不明显，富集大离子亲石元素(如K、Ba、Sr等)，亏损高场强元素(如Nb、Ta、Ti、Zr、Hf等).蒋庙基性侵入岩在长江中下游地区中生代岩浆岩中具有最高的ε_Nd(t)值以及最低的(⁸⁷Sr/⁸⁶Sr)_i值，其Sr-Nd同位素组成介于软流圈地幔(depleted MORB mantle，DMM)-富集岩石圈地幔(enriched mantle Ⅱ，EMⅡ)之间.研究认为，蒋庙岩体应来源于软流圈地幔和富集岩石圈地幔的混合组分，可能有少量的俯冲板片物质加入源区，并在成岩过程中经历了一定程度的结晶分异.结合区域地质、年代学、矿物学和地球化学资料，表明蒋庙岩体的形成可能与古太平洋板块俯冲事件密切相关.
- 蒋庙岩体 /
- 锆石U-Pb定年 /
- 岩石学 /
- 地球化学 /
- 宁镇地区
Abstract: The Ningzhen region in Jiangsu Province, representing the easternmost magmatic region within the Middle-Lower Yangtze River Metallogenic belt, and is an important component of the Middle-Lower Yangtze River magmatic rock belt. The Jiangmiao pluton is the only mafic intrusive body in the Ningzhen region, and its zircon U-Pb dating, petrological, mineralogical and geochemical data were obtained in this paper to constrain its origin and mantle source characteristics. Olivine gabbros, hornblende gabbros and pyroxene diorites are the main rock types of the pluton. The zircons from the pyroxene diorite yield a U-Pb age of 121±1 Ma. The zircon ε_Hf(t) values are from -2.9 to -6.4. The Jiangmiao mafic rocks in the Ningzhen region are sodic, and are characterized by an enriched light rare earth elements(LREEs) pattern. They are enriched in large ion lithophile elements (LIEEs) such as K, Ba, Sr, but depleted in high field strength elements such as Nb, Ta, Ti, Zr and Hf.Jiangmiao mafic intrusive rocks have the highest ε_Nd(t) and the lowest value of (⁸⁷Sr/⁸⁶Sr)_i values among Mesozoic magmatic rocks in the Middle-Lower reaches of Yangtze River belt. Sr-Nd isotopic data suggest that asthenosphere-lithosphere interaction plays an important role in the generation of the Jiangmiao pluton. The trace element and isotopic data are consistent with crystallization fractionation and there is no significant crustal contamination during magma ascending and crystallization. Enriched LREEs and LILEs, together with depleted Nb, Ta, Ti, Zr and Hf, suggest that the mantle sources were metasomatized by slab-derived fluid/melt. Combining with regional geological, geochronological, mineralogical and geochemical data, the Jiangmiao maflc rocks in the Ningzhen region were probably formed in an extensional regime associated with westward subduction of the paleo-Paciflc plate.
- Jiangmiao pluton /
- zircon U-Pb chronology /
- petrology /
- geochemistry /
- Ningzhen region

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图 1 长江中下游成矿带主要矿集区分布示意

区段：1.鄂东南；2.九瑞；3.安庆-贵池；4.庐枞；5.铜陵；6.宁芜；7.宁镇；据翟裕生等(1992)和薛怀民等(2010)修改

Fig. 1. Schematic illustration of the seven magmatic and metallogenic districts of the Middle-Lower Yangtze River metallogenic belt

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图 2 宁镇地区燕山期侵入岩分布

据夏嘉生(2000)修改

Fig. 2. The distribution of Mesozoic intrusive rocks in the Ningzhen region

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图 3 蒋庙岩体地质简图

1.角闪橄榄辉长岩相；2.辉长岩相；3.闪长岩相；4.碱基性交代-混染岩相；5.青龙群(T_1-2)；6.黄马青组(T₃)；7.象山群(J_1-2)；8.第四系(Q)；据周新民(1964)修改

Fig. 3. Sketch geological map of the Jiangmiao intrusion

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图 4 蒋庙岩体野外及镜下照片

a.航空公墓辉石闪长岩野外露头；b.蒋庙橄榄辉长岩辉长结构(正交偏光)；c.蒋庙橄榄辉长岩中斜长石呈嵌晶产于橄榄石中(正交偏光)；d.蒋庙橄榄辉长岩中斜方辉石外的角闪石反应边(单偏光)；e.蒋庙角闪辉长岩中辉石的席勒构造(单偏光)；f.蒋庙角闪辉长岩中角闪石包裹辉石、斜长石和磁铁矿产出(正交偏光)；g.蒋庙辉石闪长岩中黑云母包裹辉石产出(单偏光)；Opx.斜方辉石；Cpx.单斜辉石；Ol.橄榄石；Hb.普通角闪石；Bi.黑云母；Pl.斜长石；Mt.磁铁矿

Fig. 4. Field photographs and photomicrographs of the Jiangmiao intrusion

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图 5 蒋庙辉石闪长岩(09NJ09) 中代表性锆石的CL图像及分析点位

Fig. 5. Cathodoluminescence (CL) images and analysis position for the representative zircons from Jiangmiao pyroxene diorite

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图 6 蒋庙辉石闪长岩(09NJ09)(a)锆石U-Pb谐和图和(b)年龄误差分析

Fig. 6. Zircon U-Pb concordia diagram and (b) weighted mean ²⁰⁶Pb/²³⁸U age for the Jiangmiao pyroxene diorite

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图 7 蒋庙岩体Harker图

文献洪文涛等(2010)

Fig. 7. Harker diagram for Jiangmiao intrusion

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图 8 蒋庙岩体的(a)稀土配分图解和(b)微量元素蛛网图

球粒陨石标准值和原始地幔标准值均引自Sun and McDonough(1989)

Fig. 8. (a)Chondrite-normalized REE patterns and (b) primitive mantle normalized element spider diagram for the Jiangmiao intrusion

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图 9 蒋庙岩体的(⁸⁷Sr/⁸⁶Sr)_i-ε_Nd(t)图

DMM.亏损地幔单元；EM(Ⅰ，Ⅱ).富集地幔单元引自Zindler and Hart(1986)；角闪岩相元古代崆岭群引自Ma et al.(2000)和Ames et al.(1996)；长江中下游地区早白垩世基性岩引自Yan et al.(2008)；新生代玄武岩数据引自Zou et al.(2000)；上地壳引自Taylor and McLennan(1985)；扬子下地壳引自Jahn et al.(1999)；文献洪文涛等(2010)

Fig. 9. Initial ⁸⁷Sr/⁸⁶Sr vs. ε_Nd(t) diagram of the Jiangmiao intrusion

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图 10 蒋庙岩体(a)SiO₂-ε_Nd(t)和(b)(⁸⁷Sr/⁸⁶Sr)_i-1 000/Sr关系

文献洪文涛等(2010)

Fig. 10. (a)SiO₂ vs. ε_Nd(t) and (b) (⁸⁷Sr/⁸⁶Sr)_i vs. 1 000/Sr diagram of the Jiangmiao intrusion

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图 11 蒋庙岩体(a)Y-Zr图解和(b)10×Ba/Zr-100×Nb/Zr图解

文献1洪文涛等(2010)；文献2李顺庭(2008)；据李昌年(1992)

Fig. 11. (a) Y versus Zr and (b) 10×Ba/Zr vs. 100×Nb/Zr diagram of the Jiangmiao intrusion

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图 12 (a)单斜辉石F₁-F₂图解和(b)单斜辉石Al_Z-TiO₂图解

图a中WPT.板内拉斑玄武岩；WPA.板内碱性玄武岩；VAB.岛弧玄武岩；OFB.洋底玄武岩；图b中Al_Z是指单斜辉石中进入四面体位置的Al占全铝的百分比；图a据Nisbet and Pearce(1977)；图b据Loucks(1990)；F₁=－0.012 0SiO₂－0.080 7TiO₂+0.002 6Al₂O₃－0.001 2FeO－0.062 6MnO+0.008 7MgO－0.012 8CaO－0.041 9Na₂O；F₂=－0.046 9SiO₂－0.081 8TiO₂－0.021 2Al₂O₃－0.004 1FeO－0.143 5MnO－0.002 9MgO+0.008 5CaO+0.016 0Na₂O

Fig. 12. (a)F₁ versus F₂ diagram of clinoproxenes and (b) Al_Z versus TiO₂ diagram of clinoproxenes

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表 1 蒋庙辉石闪长岩的LA-ICP-MS锆石U-Pb年龄分析结果

Table 1. LA-ICP-MS zircon U-Pb data for the Jiangmiao pyroxene diorite

点号	元素(10^-6)				同位素比值								年龄(Ma)
点号	Th	U	Pb_Total	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	601	542	14.69	1.11	0.048 53	0.001 69	0.127 14	0.004 53	0.018 96	0.000 17	0.006 04	0.000 11	122	4	121	1
2	618	1 027	24.15	0.60	0.047 17	0.001 21	0.121 71	0.003 15	0.018 69	0.000 14	0.005 74	0.000 10	117	3	119	1
3	2 198	1 417	42.32	1.55	0.048 55	0.001 06	0.127 67	0.002 88	0.019 04	0.000 15	0.005 86	0.000 08	122	3	122	1
4	2 267	1 886	52.94	1.20	0.049 59	0.001 11	0.132 67	0.003 16	0.019 33	0.000 16	0.006 14	0.000 10	126	3	123	1
5	2 298	1 418	43.45	1.62	0.047 62	0.001 16	0.127 66	0.003 21	0.019 39	0.000 17	0.005 91	0.000 10	122	3	124	1
6	919	738	20.23	1.25	0.048 05	0.001 49	0.123 92	0.003 92	0.018 66	0.000 16	0.005 74	0.000 10	119	4	119	1
7	638	904	22.04	0.71	0.049 90	0.001 31	0.128 20	0.003 36	0.018 64	0.000 15	0.005 91	0.000 10	122	3	119	1
8	617	625	16.57	0.99	0.050 35	0.001 56	0.131 96	0.004 23	0.019 04	0.000 20	0.006 05	0.000 11	126	4	122	1
9	2 001	1 595	44.21	1.25	0.050 63	0.001 14	0.131 34	0.003 07	0.018 79	0.000 14	0.005 92	0.000 08	125	3	120	1
10	786	1 324	31.33	0.59	0.048 98	0.001 21	0.126 12	0.003 17	0.018 66	0.000 14	0.005 73	0.000 10	121	3	119	1
11	1 599	1 436	39.74	1.11	0.050 33	0.001 15	0.133 93	0.003 07	0.019 34	0.000 17	0.006 20	0.000 11	128	3	123	1
12	635	851	21.55	0.75	0.049 69	0.001 38	0.131 71	0.003 59	0.019 31	0.000 18	0.006 33	0.000 11	126	3	123	1
13	1 931	1 059	32.59	1.82	0.050 43	0.001 34	0.129 93	0.003 39	0.018 69	0.000 14	0.005 77	0.000 09	124	3	119	1
14	451	607	14.79	0.74	0.047 69	0.001 57	0.124 50	0.003 96	0.018 96	0.000 16	0.005 91	0.000 11	119	4	121	1
15	538	532	13.78	1.01	0.050 14	0.001 79	0.131 28	0.004 48	0.019 06	0.000 18	0.005 99	0.000 13	125	4	122	1
16	362	385	9.90	0.94	0.052 06	0.002 11	0.138 19	0.005 50	0.019 27	0.000 19	0.005 95	0.000 14	131	5	123	1
17	708	854	21.59	0.83	0.050 29	0.001 28	0.134 35	0.003 67	0.019 27	0.000 16	0.006 01	0.000 10	128	3	123	1
18	561	664	16.83	0.85	0.048 87	0.001 68	0.129 86	0.004 54	0.019 25	0.000 17	0.005 93	0.000 12	124	4	123	1
19	365	502	12.46	0.73	0.045 98	0.002 06	0.121 69	0.005 39	0.019 27	0.000 22	0.006 18	0.000 14	117	5	123	1

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表 2 蒋庙辉石闪长岩的锆石Lu-Hf同位素组成

Table 2. Zircon Lu-Hf isotopes for the Jiangmiao pyroxene diorite

点号	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	(¹⁷⁶Hf/¹⁷⁷Hf)_i	ε_Hf(t)	2σ	t_DM1(Ma)	2σ	t_DM2(Ma)	2σ	f_Lu/Hf
1	0.027 591	0.001 063	0.282 615	0.000 013	0.282 276	-3.0	0.5	904	36	1 365	57	-0.97
2	0.038 367	0.001 453	0.282 524	0.000 013	0.282 298	-6.2	0.5	1 043	37	1 571	58	-0.96
3	0.023 648	0.000 946	0.282 605	0.000 012	0.282 281	-3.3	0.4	916	34	1 388	55	-0.97
6	0.045 574	0.001 701	0.282 528	0.000 013	0.282 297	-6.1	0.5	1 044	38	1 563	60	-0.95
7	0.041 393	0.001 612	0.282 521	0.000 015	0.282 283	-6.4	0.5	1 052	42	1 579	66	-0.95
8	0.033 299	0.001 295	0.282 572	0.000 011	0.282 241	-4.5	0.4	971	31	1 462	48	-0.96
9	0.048 941	0.001 900	0.282 529	0.000 011	0.282 257	-6.1	0.4	1 048	32	1 562	49	-0.94
10	0.050 310	0.001 982	0.282 529	0.000 013	0.282 274	-6.1	0.5	1 051	39	1 563	60	-0.94
11	0.036 302	0.001 439	0.282 574	0.000 011	0.282 192	-4.5	0.4	972	31	1 460	49	-0.96
12	0.033 546	0.001 274	0.282 532	0.000 012	0.282 292	-5.9	0.4	1 027	35	1 553	55	-0.96
14	0.024 261	0.000 945	0.282 616	0.000 014	0.282 279	-2.9	0.5	900	39	1 363	63	-0.97
15	0.017 886	0.000 724	0.282 593	0.000 013	0.282 221	-3.7	0.5	927	36	1 414	57	-0.98
16	0.034 840	0.001 324	0.282 544	0.000 014	0.282 285	-5.5	0.5	1 011	41	1 525	65	-0.96
17	0.032 442	0.001 260	0.282 570	0.000 012	0.282 313	-4.6	0.4	973	33	1 467	52	-0.96
18	0.033 450	0.001 281	0.282 569	0.000 011	0.282 198	-4.6	0.4	975	31	1 471	49	-0.96
19	0.031 932	0.001 254	0.282 551	0.000 016	0.282 297	-5.3	0.6	999	46	1 509	73	-0.96

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表 3 蒋庙橄榄辉长岩中辉石的电子探针分析结果(%)

Table 3. Chemical compositions of the clinopyroxenes from the Jiangmiao olivine gabbros

样品编号	09NZ44-1	09NZ44-2	09NZ44-3	09NZ44-4	09NZ44-5	09NZ44-6	09NZ44-7	09NZ44-8	09NZ44-9	09NZ44-10	10NZ07-1	10NZ07-2	10NZ07-3	10NZ07-4	10NZ07-5	10NZ07-6	10NZ07-7
SiO₂	50.86	52.11	53.04	51.94	50.96	51.62	47.54	49.91	51.27	50.78	51.77	51.49	51.52	51.92	51.25	52.00	52.07
TiO₂	1.03	0.58	0.31	0.72	0.67	0.69	0.70	0.53	0.72	0.66	0.46	0.41	0.60	0.48	0.60	0.37	0.33
Al₂O₃	3.83	2.18	1.35	2.42	2.63	2.52	2.73	2.15	2.37	2.45	1.48	1.57	2.09	1.67	2.22	1.58	1.64
Cr₂O₃	0.02	0.00	0.00	0.05	0.09	0.04	0.03	0.00	0.01	0.02	0.00	0.02	0.00	0.02	0.00	0.02	0.04
FeO	7.76	7.61	7.72	7.77	8.32	7.69	6.50	6.18	7.79	7.64	8.64	8.78	8.28	8.69	8.74	8.93	8.72
MnO	0.24	0.30	0.38	0.29	0.33	0.25	0.23	0.24	0.24	0.35	0.44	0.39	0.38	0.39	0.38	0.33	0.39
MgO	13.86	15.51	15.32	15.21	14.74	14.88	14.33	15.24	14.94	15.08	14.94	14.79	14.74	15.58	15.39	15.47	15.19
CaO	21.60	22.01	20.94	21.84	21.98	21.11	19.27	20.60	21.92	21.96	21.48	21.88	22.16	20.90	21.04	20.89	21.52
Na₂O	0.39	0.39	0.36	0.34	0.43	0.37	0.34	0.30	0.36	0.39	0.40	0.43	0.30	0.38	0.36	0.38	0.38
K₂O	0.02	0.01	0.00	0.00	0.03	0.01	0.03	0.00	0.01	0.00	0.01	0.00	0.00	0.00	0.01	0.00	0.00
Total	99.60	100.70	99.41	100.57	100.19	99.17	91.70	95.16	99.62	99.32	99.63	99.75	100.06	100.03	99.99	99.99	100.29
Mg^#	76.10	78.42	77.97	77.72	75.96	77.53	79.72	81.46	77.38	77.88	75.52	75.01	76.04	76.18	75.84	75.54	75.64
Si	1.894	1.908	1.971	1.908	1.882	1.924	1.909	1.927	1.902	1.887	1.925	1.912	1.908	1.918	1.895	1.924	1.921
Al(Ⅳ)	0.104	0.078	0.027	0.082	0.100	0.071	0.085	0.067	0.085	0.095	0.060	0.069	0.079	0.067	0.088	0.061	0.063
Al(Ⅵ)	0.064	0.017	0.032	0.024	0.016	0.040	0.044	0.032	0.019	0.013	0.005	0.001	0.013	0.007	0.010	0.008	0.009
Ti	0.029	0.016	0.009	0.020	0.018	0.019	0.021	0.015	0.020	0.018	0.013	0.011	0.017	0.013	0.017	0.010	0.009
Cr	0.001	0.000	0.000	0.001	0.003	0.001	0.001	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.001
Fe³⁺	0.227	0.150	0.234	0.179	0.146	0.212	0.181	0.160	0.167	0.131	0.183	0.163	0.179	0.182	0.167	0.190	0.179
Fe²⁺	0.015	0.085	0.006	0.061	0.113	0.028	0.038	0.040	0.076	0.108	0.088	0.113	0.080	0.089	0.106	0.089	0.092
Mn	0.008	0.009	0.012	0.009	0.010	0.008	0.008	0.008	0.007	0.011	0.014	0.012	0.012	0.012	0.012	0.010	0.012
Mg	0.769	0.847	0.849	0.833	0.812	0.827	0.857	0.877	0.826	0.835	0.828	0.819	0.814	0.858	0.848	0.853	0.836
Ca	0.862	0.863	0.834	0.860	0.870	0.843	0.829	0.852	0.871	0.874	0.856	0.871	0.879	0.827	0.833	0.828	0.851
Na	0.028	0.028	0.026	0.024	0.031	0.027	0.026	0.023	0.026	0.028	0.029	0.031	0.021	0.027	0.026	0.027	0.027
K	0.001	0.001	0.000	0.000	0.002	0.000	0.002	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.000	0.000
Wo	45.83	44.18	43.10	44.27	44.58	43.96	43.33	43.97	44.72	44.60	43.47	44.04	44.79	42.03	42.39	42.03	43.19
En	40.90	43.33	43.88	42.90	41.60	43.11	44.82	45.28	42.42	42.63	42.08	41.41	41.45	43.61	43.14	43.32	42.42
Fs	13.27	12.49	13.02	12.82	13.82	12.93	11.85	10.74	12.86	12.77	14.45	14.55	13.76	14.37	14.48	14.65	14.39
注：单斜辉石阳离子数以4个氧原子为基础计算出，Fe³⁺和Fe²⁺利用电价差值法求得，Mg^#=100×molarMgO/(MgO+FeO).

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表 4 蒋庙岩体主量元素(%)、微量元素(10^-6)及Sr-Nd同位素组成

Table 4. Major (%), trace element (10^-6) and Sr-Nd isotopic compositions of the Jiangmiao intrusion

样品号	10NZ07	09NZ44	09NZ45	09NJ09	09NZ46
SiO₂	46.09	44.25	53.67	57.14	55.16
TiO₂	1.33	1.71	1.01	0.90	0.65
Al₂O₃	17.46	17.74	16.88	17.13	16.98
FeO_t	11.84	12.95	8.25	7.06	3.28
MnO	0.20	0.22	0.15	0.13	0.05
MgO	6.52	6.17	4.26	3.13	5.29
CaO	11.03	10.53	7.25	6.26	12.94
Na₂O	2.33	3.09	3.49	3.84	3.92
K₂O	0.18	0.32	2.56	2.82	0.2
P₂O₅	0.79	1.21	0.45	0.41	0.18
H₂O⁺	1.19	0.76	1.24	0.56	0.89
CO₂	0.15	0.08	0.06	0.08	0.06
LOI	0.71	0.04	0.88	-	0.89
Total	99.82	99.07	100.15	99.46	100.49
Na₂O/K₂O	12.94	9.66	1.36	1.36	19.60
Mg^#	50	46	48	44	74
Li	6.57	2.68	16.50	13.20	9.87
Be	0.49	0.97	1.36	1.97	0.81
Sc	30.6	26.0	19.1	16.3	28.7
V	398	383	224	184	127
Cr	43.50	20.20	40.00	9.59	55.20
Co	53.9	49.4	24.2	20.3	11.0
Ni	36.2	28.1	22.4	11.0	22.2
Cu	169.0	25.0	182.0	72.0	38.5
Zn	106.0	140.0	86.7	81.2	17.3
Ga	21.4	24.6	20.0	21.0	17.3
Rb	1.70	2.56	79.30	104.00	2.49
Sr	1633	1345	870	853	896
Y	21.8	32.5	19.2	21.4	13.4
Zr	14.0	25.8	148.0	215.0	52.8
Nb	0.70	3.94	11.80	16.60	2.24
Cs	0.63	0.23	2.20	3.98	0.16
Ba	429	604	862	985	123
La	34.10	53.50	37.00	44.20	8.36
Ce	72.1	105.0	67.6	79.4	17.1
Pr	9.28	13.30	7.78	8.95	3.01
Nd	41.4	57.6	31.1	34.5	14.0
Sm	8.63	11.3	6.30	6.44	3.40
Eu	2.85	2.92	1.74	1.76	0.89
Gd	7.13	9.59	5.17	5.49	3.22
Tb	0.89	1.21	0.71	0.76	0.48
Dy	4.49	6.09	3.83	4.11	2.64
Ho	0.79	1.06	0.72	0.77	0.51
Er	1.89	2.76	1.97	2.12	1.34
Tm	0.24	0.34	0.27	0.31	0.20
Yb	1.48	2.04	1.80	2.04	1.24
Lu	0.22	0.28	0.25	0.32	0.19
Hf	0.62	1.05	3.96	5.44	1.71
Ta	0.08	0.22	0.63	0.92	0.19
Pb	2.40	7.63	10.90	18.70	4.30
Th	0.32	1.62	9.41	14.90	1.23
U	0.07	0.37	2.15	4.04	0.16
Sr/Y	74.9	41.4	45.3	39.9	66.8
(La/Yb)_N	16.5	18.8	14.8	15.6	4.8
δEu	1.08	0.83	0.91	0.88	0.81
⁸⁷Rb/⁸⁶Sr	-	0.005 5	0.263 7	-	-
⁸⁷Sr/⁸⁶Sr(2σ)	-	0.704 591(6)	0.705 065(4)	-	-
¹⁴⁷Sm/¹⁴⁴Nd	-	0.118 9	0.122 3	-	-
¹⁴³Nd/¹⁴⁴Nd(2σ)	-	0.512 581(9)	0.512 487(5)	-	-
⁸⁷Sr/⁸⁶Sr(t)	-	0.704 582	0.704 612	-	-
ε_Nd(t)	-	0.1	-1.8	-	-
注：FeO_t表示全铁；“-”处表示未测试或计算；Mg^#=100×Mg²⁺/(Mg²⁺+Fe_t²⁺)，t=121 Ma.

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长江中下游地区燕山晚期基性岩浆活动的记录

doi: 10.3799/dqkx.2017.077

作者简介:
孙洋(1985-)，女，讲师，博士，主要从事矿物学、岩石学、矿床学专业研究.ORCID：0000-0002-8811-3020.E-mail：565765032@qq.com

通讯作者:
马昌前，E-mail：cqma@cug.edu.cn

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Record of Late Yanshanian Mafic Magmatic Activity in the Middle-Lower Yangtze River Metallogenic Belt

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长江中下游地区燕山晚期基性岩浆活动的记录

doi: 10.3799/dqkx.2017.077

作者简介: 孙洋(1985-)，女，讲师，博士，主要从事矿物学、岩石学、矿床学专业研究.ORCID：0000-0002-8811-3020.E-mail：565765032@qq.com

通讯作者: 马昌前，E-mail：cqma@cug.edu.cn

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Record of Late Yanshanian Mafic Magmatic Activity in the Middle-Lower Yangtze River Metallogenic Belt

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出版历程

目录

作者简介:
孙洋(1985-)，女，讲师，博士，主要从事矿物学、岩石学、矿床学专业研究.ORCID：0000-0002-8811-3020.E-mail：565765032@qq.com

通讯作者:
马昌前，E-mail：cqma@cug.edu.cn