滇西金沙江-红河构造带鲁甸始新世煌斑岩成因及动力学背景

贺娟; 王启宇; 闫国川

doi:10.3799/dqkx.2018.105

滇西金沙江-红河构造带鲁甸始新世煌斑岩成因及动力学背景

doi: 10.3799/dqkx.2018.105

1.
中国地质调查局成都地质调查中心, 四川成都 610081
2.
山东科技大学地球科学与工程学院, 山东青岛 266590
3.
中国地质大学地球科学与资源学院, 北京 100083

基金项目:

国家重点研究发展计划 2015CB452601

中国地质调查局项目 DD20160016

国家自然科学基金项目 41603038

详细信息

作者简介:
贺娟(1986-), 女, 博士研究生, 主要从事岩石学与岩石地球化学研究

中图分类号: P597
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出版历程
- 收稿日期: 2018-05-30
- 刊出日期: 2018-08-15

Genesis and Geodynamic Settings of the Eocene Lamprophyres from Jinshajiang-Red River Tectonic Belt, Ludian, Western Yunnan Province

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
College of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 前人对金沙江-红河构造带上的煌斑岩研究工作主要集中在南段哀牢山地区.对构造带中段鲁甸地区新发现的煌斑岩脉进行了锆石U-Pb年代学和全岩地球化学研究.结果表明，煌斑岩形成时代为始新世末期，与滇西新生代富碱斑岩高峰期一致.鲁甸煌斑岩具有高钾、富碱、高Mg^#，富集大离子亲石元素（LILE）和轻稀土元素（LREE），亏损高场强元素（HFSE，尤其是Ta-Nb-Ti）的特征.其岩浆源区为受俯冲流体和熔体交代的岩石圈地幔，源区组分为含金云母的尖晶石相方辉橄榄岩.结合同期的镁铁质火山岩和富碱斑岩研究成果，滇西区域的岩石圈地幔富集过程可能为元古宙时期与罗迪尼亚超大陆聚合相关的俯冲作用.始新世时期，在印度和亚洲大陆碰撞过程中，金沙江-红河构造带的富集岩石圈地幔发生拆沉或对流减薄，软流圈物质上涌，引发富集的岩石圈地幔部分熔融，形成本期煌斑岩岩浆作用.
- 煌斑岩 /
- 金沙江-红河构造带 /
- 富集地幔 /
- 岩石成因 /
- 鲁甸 /
- 滇西 /
- 地质年代学 /
- 地球化学
Abstract: Researches on the lamprophyres from the Jinshajiang-Red River tectonic belt are mainly concentrated in the southern Ailaoshan area.The zircon U-Pb geochronology and the whole rock geochemistry of the newly discovered Ludian lamprophyres located in the middle segment of the belt are applied in this paper.Zircon U-Pb dating proves Eocene emplacement age of Ludian lamprophyres, which is consistent with the peak age of the Cenozoic magmatism in the Jingshajiang-Red River alkali-rich intrusion belt.Geochemical data indicate that Ludian lamprophyres have the characteristics of high K₂O, high (K₂O + Na₂O) and Mg^#, low TiO₂, being enriched in LILE and LREE, depleted in HFSE (especially Ta-Nb-Ti).The source of the Ludian lamprophyres should be the lithosphere mantle which had been enriched by subduction-related fluids and melts, and the source should be phlogopite bearing spinel harzburgite.Combined with the study of coeval mafic lava and felsic intrusion, we put forward that the mantle in western Yunnan might have been enriched by the Protozoic subduction related to the assembly of the Rodinia supercontinent.In the Eocene, following the collision between Indian and Asia, the continental lithosphere in the Jingshajiang-Red River tectonic belt underwent convective thinning or delamination, which induced rising of the asthenosphere, and then partial melting of the enriched lithosphere mantle which generated the lamprophyre melt.
- lamprophyres /
- Jingshajiang-Red River tectonic belt /
- enriched mantle /
- petrogenesis /
- Ludian /
- western Yunnan /
- geochronology /
- geochemistry

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图 1 区域地质构造简图(a)和金沙江-红河构造带区域构造简图(b)

底图据He et al.(2016).年龄数据来源：北衙(和文言等，2014；Lu et al., 2015)；马厂箐(贾丽琼等，2013；徐恒等，2015)；小水井(符德贵等，2010)；镇沅(陈福川等，2015)；白马寨(管涛等，2006)；大坪(王江海等，2001；Chen et al., 2014)

Fig. 1. Simplified geological map of study area (a) and simplified geological map of Jinshajiang-Red River tectonic belt (b)

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图 2 云南鲁甸地质简图

Fig. 2. Geological sketch of Ludian, Yunnan Province

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图 3 鲁甸煌斑岩野外露头和镜下特征

Ol.橄榄石；Bi.黑云母；Pl.斜长石；CPX.单斜辉石

Fig. 3. Outcrop and microphotographs of Ludian lamprophyres

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图 4 鲁甸煌斑岩代表性锆石CL图像和U-Pb年龄谐和图

实线圈及数字代表U-Pb同位素测试点位及点号

Fig. 4. Zircon CL images and U-Pb concordia diagrams of Ludian lamprophyres

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图 5 鲁甸煌斑岩TAS分类图解(a)和nK/n(K+Na)-nK/nAl图解(b)

图a据Rock(1987)；CAL.钙碱性煌斑岩，UML.超基性煌斑岩，AL.碱性煌斑岩，LL.钾镁煌斑岩.图b据路凤香等(1991)；金沙江-红河构造带煌斑岩数据来自黄智龙和王联魁(1996)，管涛等(2006), 贾丽琼等(2013)，和文言等(2014)

Fig. 5. TAS diagram (a) and nK/n(K+Na)-nK/nAl diagram (b) of Ludian lamprophyres

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图 6 鲁甸煌斑岩K₂O-Na₂O图解

金沙江-红河构造带煌斑岩数据来源同图 5；金沙江-红河构造带富碱斑岩数据来自Lu et al.(2013)；金沙江-红河构造带镁铁质火山岩数据来自Huang et al.(2010)

Fig. 6. K₂O-Na₂O diagram for Ludian lamprophyres

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图 7 鲁甸煌斑岩球粒陨石标准化稀土元素配分模式(a)和原始地幔标准化微量元素蛛网图(b)

金沙江-红河构造带煌斑岩、富碱斑岩和镁铁质火山岩数据来源同图 5和6；标准化数据引自Sun and McDonough (1989)

Fig. 7. The chondrite-normalized REE pattern (a) and the PM-normalized trace element spider diagram (b) for Ludian lamprophyres

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图 8 鲁甸煌斑岩的Ce/Yb-Sm图解(a)和La/Sm-La图解(b)

图a底图据Guo et al.(2005)；图b数据来源同图 5

Fig. 8. Ce/Yb-Sm diagram (a) and La/Sm-La diagram (b) for Ludian lamprophyres

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图 9 鲁甸煌斑岩的Zr/Hf-Nb/Ta图解(a)和TiO₂-TFe₂O₃图解(b)

图a据Sun and McDonough (1989)；CC.陆壳平均值，PM.原始地幔平均值.图b据Lu et al.(2015)；数据来源同图 6

Fig. 9. Zr/Hf-Nb/Ta diagram (a) and TiO₂-TFe₂O₃ diagram (b) for Ludian lamprophyres

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图 10 煌斑岩的Rb/Sr-Ba/Rb图解(a)和Dy/Yb-La/Yb图解(b)

图b据和文言等(2014)；数据来源同图 5和6

Fig. 10. Rb/Sr-Ba/Rb diagram (a) and Dy/Yb-La/Yb diagram (b) for Ludian lamprophyres

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图 11 鲁甸煌斑岩的Nb/Zr-Th/Zr图解(a)和Ba/La-La/Yb图解(b)

图b底图据朱弟成等(2006)

Fig. 11. Nb/Zr-Th/Zr diagram (a) and Ba/La-La/Yb diagram (b) for Ludian lamprophyres

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图 12 鲁甸煌斑岩构造岩浆成因模式

Fig. 12. Tectono-magmatic model for Ludian lamprophyres

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表 1 鲁甸煌斑岩锆石U-Pb测年结果

Table 1. Zircon U-Pb ages for Ludian lamprophyres

测点号	元素含量(10^-6)			Th/U	同位素比值						年龄(Ma)
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
1	375	865	660	1.31	0.071 2	0.002 3	1.521 2	0.048 5	0.154 6	0.001 8	0.049 3	0.001 2	939	20	927	10
2	212	1 283	1 820	0.70	0.051 3	0.001 8	0.306 4	0.011 4	0.043 1	0.000 5	0.013 6	0.000 4	271	9	272	3
3	475	1 135	1 239	0.92	0.071 0	0.002 2	0.913 0	0.039 2	0.091 4	0.002 0	0.055 5	0.001 2	659	21	564	12
4	1 011	2 238	1 780	1.26	0.083 1	0.001 9	1.750 6	0.040 3	0.152 2	0.001 4	0.051 7	0.001 1	1 027	15	913	8
5	176	8 589	7 227	1.19	0.047 0	0.002 1	0.044 2	0.002 0	0.006 8	0.000 1	0.002 4	0.000 1	44	2	44	1
8	1 051	1 604	2 819	0.57	0.071 5	0.003 1	1.327 1	0.040 7	0.136 0	0.001 9	0.051 0	0.002 0	858	18	822	11
9	170	9 827	9 471	1.04	0.048 2	0.002 2	0.035 7	0.001 6	0.005 4	0.000 1	0.001 8	0.000 1	36	2	35	0
10	600	2 161	7 247	0.30	0.048 1	0.001 4	0.254 1	0.007 8	0.038 1	0.000 5	0.012 4	0.000 4	230	6	241	3
11	878	1 656	2 094	0.79	0.066 7	0.001 8	1.325 8	0.037 1	0.143 6	0.001 7	0.044 3	0.001 1	857	16	865	10
12	367	2 690	2 964	0.91	0.049 4	0.001 9	0.270 1	0.009 9	0.039 9	0.000 5	0.012 7	0.000 3	243	8	252	3
14	242.6	225	2 651	0.08	0.051 7	0.002 2	0.296 2	0.013 7	0.041 5	0.000 6	0.052 7	0.002 3	263	11	262	4
15	292	290	1 559	0.19	0.058 7	0.002 5	0.703 9	0.032 8	0.087 4	0.001 2	0.041 2	0.001 6	541	20	540	7
16	115.6	4 151	6 294	0.66	0.048 3	0.002 9	0.043 9	0.002 9	0.006 6	0.000 1	0.002 4	0.000 1	44	3	42	1
17	215	1 309	2 038	0.64	0.049 6	0.002 8	0.260 2	0.015 9	0.038 3	0.000 5	0.013 6	0.000 5	235	13	242	3
18	1 400	1 980	2 209	0.90	0.076 6	0.003 8	2.128 7	0.119 6	0.202 6	0.002 6	0.067 8	0.001 8	1 158	39	1 189	14
19	300	18 923	10 451	1.81	0.051 3	0.003 1	0.043 8	0.002 9	0.006 3	0.000 1	0.002 3	0.000 1	44	3	40	1
22	553	1 172	1 141	1.03	0.068 3	0.002 7	1.345 9	0.058 1	0.143 3	0.002 0	0.051 1	0.001 4	866	25	863	11
26	1 367	2 503	1 902	1.32	0.077 7	0.002 1	2.148 1	0.058 2	0.199 4	0.002 2	0.062 3	0.001 4	1 164	19	1 172	12
27	138	1 052	1 176	0.90	0.051 3	0.002 6	0.280 1	0.013 9	0.039 4	0.000 5	0.012 6	0.000 4	251	11	249	3

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表 2 鲁甸煌斑岩岩石化学分析(%)和稀土元素(10^-6)分析结果

Table 2. Chemical analysis (%) and rare earth elements (10^-6) results for the samples of Ludian lamprophyres

样品号	HB-01-H1	HB-02-H1	HB-02-H2	HB-03-H1	HB-04-H1	HB-05-H1	HB-06-H1	HB-07-H1
SiO₂	52.91	57.33	56.75	57.57	56.89	56.2	56.72	55.96
TiO₂	0.78	0.74	0.82	0.73	0.73	0.74	0.70	0.71
Al₂O₃	11.16	12.98	13.05	12.61	12.92	12.04	12.62	13.34
Fe₂O₃	1.58	1.63	1.40	1.54	1.09	1.16	1.69	1.64
FeO	6.77	5.65	5.85	5.58	6.25	6.25	5.90	5.89
MnO	0.10	0.14	0.14	0.13	0.14	0.13	0.14	0.14
MgO	8.28	7.15	6.68	7.20	7.46	8.64	8.31	7.82
CaO	5.42	5.60	6.09	5.78	5.84	5.67	6.29	6.44
Na₂O	1.56	2.70	2.63	2.64	2.61	2.25	2.54	2.62
K₂O	3.84	3.58	3.52	3.55	3.57	3.36	3.05	3.52
P₂O₅	0.33	0.35	0.38	0.34	0.32	0.32	0.33	0.37
LOI	5.80	1.14	1.77	1.44	1.20	2.24	0.84	0.69
Total	98.53	98.99	99.08	99.11	99.02	99.00	99.13	99.14
Sc	18.6	21.9	21.5	21.0	22.8	22.3	21.9	24.6
Ti	4 660	4 912	4 927	4 742	4 833	4 788	4 176	4 694
V	147	180	165	162	176	178	157	178
Cr	269	479	261	256	534	617	511	685
Mn	776	1 212	1 102	1 141	1 256	1 079	1 127	1 233
Co	33.3	34.9	31.9	33.1	36.1	34.7	35.6	39.6
Ni	246	246	219	243	252	253	307	280
Cu	81.0	71.0	67.9	57.6	69.0	59.6	56.5	67.5
Zn	57.8	83.1	83.2	81.4	87.8	63.2	77.1	75.2
Ga	16.0	17.0	16.1	16.7	17.2	16.5	14.2	15.8
Ge	7.93	7.82	6.32	6.56	7.86	7.62	6.89	7.49
Rb	186	152	139	146	151	161	123	156
Sr	575	1 113	915	1 080	1 064	694	715	901
Y	23.5	27.6	26.2	26.4	27.2	26.0	24.6	24.5
Zr	228	254	125	135	244	231	204	216
Nb	9.82	9.99	9.98	9.88	10.1	9.39	8.54	8.60
Cs	17.8	14.2	11.8	15.2	14.2	21.9	8.10	9.00
Ba	846	1 065	946	1 080	1 052	877	754	894
La	24.0	29.4	27.2	28.9	28.4	24.6	22.1	22.6
Ce	48.1	62.2	57.8	60.9	60.3	51.2	46.4	47.0
Pr	5.98	7.99	7.42	7.81	7.76	6.46	5.87	5.94
Nd	23.9	32.1	29.8	31.5	30.8	25.8	23.8	24.0
Sm	4.96	6.30	5.96	6.11	6.05	5.47	5.08	5.09
Eu	1.09	1.51	1.45	1.45	1.43	1.27	1.19	1.25
Gd	4.21	5.22	5.04	5.05	5.02	4.67	4.37	4.39
Tb	0.71	0.87	0.84	0.84	0.85	0.82	0.76	0.75
Dy	4.09	5.01	4.88	4.85	4.97	4.73	4.44	4.41
Ho	0.83	1.01	0.97	0.97	0.98	0.94	0.89	0.87
Er	2.37	2.88	2.73	2.73	2.81	2.69	2.55	2.52
Tm	0.36	0.42	0.40	0.39	0.41	0.40	0.37	0.37
Yb	2.30	2.70	2.48	2.51	2.63	2.54	2.40	2.35
Lu	0.35	0.41	0.37	0.37	0.40	0.39	0.36	0.36
Hf	3.47	3.90	2.33	2.58	3.76	3.54	3.10	3.25
Ta	0.69	0.72	0.70	0.70	0.72	0.67	0.60	0.62
Pb	22.3	29.0	27.2	29.1	29.0	20.4	26.1	24.5
Th	8.88	8.72	8.08	8.84	8.98	8.25	7.47	8.00
U	3.04	3.21	2.68	2.98	3.11	2.87	2.62	2.76

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参考文献(56)

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