滇西维西—德钦一带花岗岩年代学、地球化学和岩石成因

高睿; 肖龙; 何琦; 袁静; 倪平泽; 杜景霞

doi:10.3799/dqkx.2010.019

滇西维西—德钦一带花岗岩年代学、地球化学和岩石成因

doi: 10.3799/dqkx.2010.019

高睿¹,
肖龙^2, ,,
何琦¹,
袁静¹,
倪平泽¹,
杜景霞¹

1.
中国地质大学研究生院, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

国家自然科学基金 40772043

国家自然科学基金 40572031

详细信息

作者简介:
高睿(1985-), 男, 博士研究生, 岩石学、矿物学、矿床学专业

通讯作者:
肖龙, E-mail: longxiao@cug.edu.cn

中图分类号: P597
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- 被引次数: 0
出版历程
- 收稿日期: 2009-01-11
- 刊出日期: 2010-03-01

Geochronology, Geochemistry and Petrogenesis of Granites in Weixi-Deqin, West Yunnan

1.
Graduate School, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 金沙江弧盆体系消减与碰撞的确切时间存在较大的争议.运用LA-ICP-MS地质年代学、地球化学及Sr-Nd同位素方法研究金沙江缝合带周边的花岗岩体.贡卡花岗闪长岩(232 Ma)和羊拉花岗闪长岩(229.6 Ma)形成于印支期, 羊拉二长花岗岩(261 Ma)形成于海西—印支期.羊拉二长花岗岩地球化学特征类似O型埃达克岩, 由大洋板片熔融与地幔楔交代(Mg^#=55~61.8＞40), 且上升过程与岩浆房酸性岩浆混合, 形成于俯冲消减环境; 贡卡花岗闪长岩和羊拉花岗闪长岩可能由类似扬子地块的崇山群玄武质岩石和变质表壳岩部分熔融形成, 产于碰撞后环境.金沙江缝合带从中二叠世末期—晚二叠世早期持续俯冲; 碰撞阶段可能于晚二叠世末期开始, 在中三叠世早期结束.
- 古特提斯 /
- 埃达克质岩 /
- Ⅰ型花岗岩 /
- 地质年代学 /
- 地球化学 /
- Sr-Nd同位素 /
- 岩石成因
Abstract: There is still much dispute over the exact subduction and collision time of Jinshajiang arc-basin system, which reveals geological evolution history of the paleo-Tethys in West China. This study provides chronological, petrological, and geochemical data of Gongka and Yangla granitoid plutons that are situated on the western margin of Jinshajiang suture zone but poorly studied in Deqin-Weixi area, Yunnan Province. The Yangla granitoid complex is divided into granodiorite and monzonite. LA-ICP-MS zircon dating results are 229.6 Ma (Yangla granodiorite), 232 Ma (Gongka granodiorite) and 261 Ma (Yangla monzonite), respectively. Yangla monzonites, showing O-adakitic affinity, was generated through partial melting of oceanic slab when subducting, probably subjected to metasomatism of the mantle wedge. Gongka granodiorites and Yangla granodiorites were derived from partial melting of lower crustal rocks. In general, we conclude that the subduction started from Middle Permian to Late Permian and the collision started in Late Permian and terminated in early Middle Triassic.
- paleo-Tethys /
- adakitic rock /
- Ⅰ-type granite /
- geochronology /
- geochemistry /
- Sr-Nd isotope /
- petrogenesis

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图 1 滇西德钦—维西一带花岗岩岩类岩体地质图

a图据李兴振等(1999)修编；b图据孙晓猛和简平(2004)；1.甘孜－理塘缝合带；2.金沙江缝合带；3.澜沧江缝合带；4.哀牢山缝合带；5.昌宁－孟连缝合带；6.怒江缝合带；7.中咱—中甸地块；8.昌都地块；9.思茅地块；10.保山地块；11.察隅地块；12.扬子地块；①中间地块；②被动大陆边缘；③蛇绿混杂岩带；④岛弧火山岩；⑤蛇绿岩；⑥磨拉石建造；⑦变质岩；⑧断层；⑨花岗岩闪长岩；⑩二长花岗岩

Fig. 1. Geological map of granitoids in Deqin-Weixi district, West Yunnan

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图 2 滇西花岗岩类样品U-Pb一致和谐曲线

Fig. 2. U-Pb concordian curves of granitoids in West Yunnan

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图 3 滇西花岗岩类岩体及包体K₂O-SiO₂图解(a)与包体的铝饱和指数图解(b)(Rickwood, 1989)

Fig. 3. The K₂O-SiO₂ diagram (a) and Al-saturation index diagram (b) of two granitoids and their enclaves in West Yunnan

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图 4 滇西花岗岩类岩体与包体稀土元素配分型式图解(a)与微量元素配分型式图解(b)(标准化的球粒陨石REE含量引自Sun and McDonough, 1989)

Fig. 4. Chondrite-normalized REE diagram (a) and primitive mantle-normalized trace element diagram (b) of granitoids and enclaves in West Yunnan

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图 5 滇西羊拉二长花岗岩Sr/Y-Y图解(a)和Mg^#-SiO₂图(b)(Sen and Dunn, 1994; Rapp and Watson, 1995; Rapp et al., 1999)

Fig. 5. Sr/Y-Y diagram (a) and Mg^#-SiO₂ diagram (b) of granitoids in West Yunnan

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图 6 (¹⁴³Nd/¹⁴⁴Nd)_t-(⁸⁷Sr/⁸⁶Sr)_i(a)和ε_Nd(t)-ε_Sr(b)图解

DM.亏损地幔；BSE.全硅酸岩地球；HIMU.高²³⁸U/²⁰⁴Pb比值地幔；EMI.富集Ⅰ型地幔；EMⅡ.富集Ⅱ型地幔；点苍山群，崇山群，大勐龙群，惠民变火山岩和粟义变火山岩属于扬子地块西南缘，分布于滇西地区的前寒武纪变质基底的岩石单位；高黎贡群属于缅泰马地块前寒武纪变质基底岩石单位(钟大赉，1998)

Fig. 6. Diagrams of (¹⁴³Nd/¹⁴⁴Nd)_t-(⁸⁷Sr/⁸⁶Sr)_i (a) and ε_Nd(t)-ε_Sr(b)

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图 7 滇西花岗岩类岩体Nb-Y、Rb-(Y+Nb)判别图(Pearce et al., 1984)

Syn-COLG.同碰撞环境；Post-COLG.后碰撞环境；WPG.板内花岗岩；ORG.大洋脊花岗岩

Fig. 7. Nb-Y discriminant diagram and Rb-(Y+Nb) discriminant diagram of granitoids in West Yunnan

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表 1 滇西花岗岩类岩体锆石U-Pb测年数据

Table 1. Zircon U-Pb data of granitoids in West Yunnan

分析点	U(10^-6)	Th(10^-6)	Th/U	比值						t (Ma)
分析点	U(10^-6)	Th(10^-6)	Th/U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ
贡卡花岗闪长岩
GK34-01	541	235	0.44	0.036 5	0.037 0	0.286 3	0.525 0	0.055 6	0.094 0	231	2	184	2
GK34-02	582	304	0.52	0.036 7	0.036 0	0.264 0	0.397 0	0.051 9	0.074 0	232	2	170	3
GK34-03	901	597	0.66	0.037 5	0.037 0	0.294 4	0.457 0	0.057 1	0.083 0	237	2	184	3
GK34-04	349	205	0.59	0.038 1	0.037 0	0.277 6	0.464 0	0.052 3	0.081 0	241	2	181	3
GK34-05	75	70	0.93	0.173 8	0.156 0	1.761 4	3.492 0	0.072 0	0.104 0	1 033	9
GK34-06	802	425	0.53	0.036 5	0.035 0	0.261 6	0.387 0	0.051 9	0.072 0	231	2	176	4
GK34-07	553	229	0.41	0.035 5	0.035 0	0.264 6	0.435 0	0.054 7	0.083 0	225	2	193	4
GK34-08	545	230	0.42	0.035 9	0.035 0	0.254 2	0.419 0	0.051 3	0.077 0	227	2	184	4
羊拉花岗闪长岩
YL09-01	1 526	598	0.39	0.035 2	0.034 0	0.257 6	0.342 0	0.052 4	0.067 0	223	2	145	2
YL09-02	999	365	0.37	0.035 9	0.035 0	0.304 0	0.448 0	0.060 8	0.085 0	228	2	179	2
YL09-03	1 216	472	0.39	0.036 4	0.035 0	0.296 9	0.388 0	0.058 3	0.074 0	231	2	170	3
YL09-04	739	227	0.31	0.036 7	0.036 0	0.342 6	0.677 0	0.067 7	0.150 0	232	2	225	3
YL09-05	1 115	417	0.37	0.036 7	0.036 0	0.276 0	0.397 0	0.053 7	0.073 0	232	2	174	3
YL09-06	923	361	0.39	0.035 9	0.035 0	0.328 2	0.502 0	0.064 7	0.092 0	228	2	200	4
YL09-07	1 093	394	0.36	0.035 4	0.034 0	0.273 2	0.413 0	0.055 6	0.078 0	224	2	187	4
YL09-08	827	304	0.37	0.035 0	0.034 0	0.318 5	0.784 0	0.066 0	0.175 0	222	2	215	4
YL09-09	956	396	0.41	0.036 7	0.037 0	0.339 4	0.939 0	0.067 0	0.197 0	233	2	225	2
YL09-10	893	310	0.35	0.038 5	0.040 0	0.275 9	0.390 0	0.050 9	0.000 7	243	2	243	2
羊拉二长花岗岩
YL17-01	704	268	0.38	0.041 3	0.000 7	0.348 4	0.016 6	0.060 2	0.002 3	261	4	312	3
YL17-02	2 934	531	0.18	0.041 2	0.000 5	0.303 0	0.011 2	0.051 8	0.001 2	261	3	329	9
YL17-03	1 313	607	0.46	0.041 0	0.000 4	0.296 2	0.009 9	0.052 9	0.001 1	259	3	234	4
YL17-04	363	142	0.39	0.041 6	0.000 5	0.309 5	0.015 9	0.053 0	0.002 4	262	3	277	9
YL17-05	583	242	0.41	0.041 3	0.000 5	0.304 7	0.013 3	0.053 5	0.001 7	261	3	284	7
YL17-06	1 094	553	0.51	0.041 2	0.000 4	0.300 8	0.011 2	0.051 8	0.001 1	260	2	248	4
YL17-07	329	163	0.50	0.041 4	0.000 5	0.283 4	0.013 3	0.049 7	0.002 0	262	3	274	8
YL17-08	3 370	1 606	0.48	0.041 0	0.000 3	0.296 7	0.009 6	0.049 7	0.000 8	259	2	272	3
YL17-09	411	133	0.33	0.041 3	0.000 5	0.297 3	0.013 2	0.052 0	0.001 9	261	3	293	9
YL17-10	591	269	0.45	0.041 5	0.000 5	0.292 2	0.011 3	0.051 0	0.001 6	262	3	295	6
YL17-11	409	150	0.37	0.041 5	0.001 1	0.337 2	0.019 3	0.058 5	0.002 0	262	3	305	6

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表 2 滇西花岗岩类岩体及包体主量元素(%)、微量元素和稀土元素含量(10^-6)

Table 2. Trace elements (%) and REE contents (10^-6) of granitoids and enclaves in West Yunnan

样号	YL13	YL14-3	YL15-2	YL17	GK35-1	GK35-2	GK35-3
样号	羊拉花岗闪长岩		羊拉二长花岗岩		贡卡花岗闪长岩		贡卡二长闪长质包体
SiO₂	63.11	65.55	67.21	67.72	61.96	64.90	65.01
Al₂O₃	16.31	15.31	17.61	16.17	15.81	14.31	15.65
FeO	4.77	4.17	1.67	2.42	5.02	3.75	3.27
Fe₂O₃	0.70	0.71	0.43	0.17	0.89	0.96	0.49
TiO₂	0.61	0.54	0.31	0.39	0.77	0.59	0.59
MgO	2.23	1.87	1.48	1.72	2.66	3.28	1.89
MnO	0.09	0.08	0.03	0.04	0.10	0.07	0.04
CaO	5.08	4.15	3.55	2.79	5.89	4.38	3.84
K₂O	2.80	3.55	1.49	1.77	2.40	3.14	3.83
Na₂O	2.83	2.61	4.96	4.45	1.75	2.49	2.81
P₂O₅	0.16	0.13	0.05	0.14	0.15	0.22	0.20
H₂O⁺	1.02	1.08	0.90	1.77	2.31	1.58	1.80
CO₂	0.09	0.05	0.12	0.28	0.09	0.09	0.37
Total	99.80	99.80	99.81	99.83	99.80	99.76	99.79
Rb	116.42	144.77	42.12	132.77	165.72	118.72	47.66
Ba	557.05	684.56	269.48	501.68	681.83	298.57	231.29
Th	13.91	13.52	1.41	19.33	21.00	3.12	2.39
U	3.74	3.14	0.29	7.54	5.26	4.69	0.82
Ta	1.02	1.14	0.11	1.45	1.15	1.67	0.17
Nb	9.93	10.88	2.73	12.79	11.20	12.96	2.61
Sr	339.60	320.33	382.48	430.91	412.11	366.83	430.29
Zr	110.63	139.12	95.65	173.62	192.81	116.11	95.37
Hf	3.21	3.96	2.34	4.90	5.43	3.84	2.61
La	26.75	26.37	7.60	10.97	33.70	47.62	16.66
Ce	52.26	50.50	14.86	19.89	67.67	96.63	57.77
Pr	5.70	5.46	1.82	2.23	7.89	10.26	9.90
Nd	21.37	19.95	7.15	8.27	30.43	36.97	47.10
Sm	4.42	3.78	1.39	1.54	6.11	6.56	13.06
Eu	1.02	0.96	0.51	0.63	1.37	1.43	2.23
Gd	3.73	3.18	1.12	1.41	5.01	5.14	10.93
Tb	0.56	0.47	0.14	0.18	0.69	0.69	1.64
Dy	3.55	2.96	0.78	1.07	4.02	3.76	10.05
Ho	0.74	0.62	0.13	0.21	0.79	0.7	2.08
Er	2.21	1.73	0.35	0.49	2.10	1.78	5.43
Tm	0.32	0.25	0.05	0.07	0.29	0.24	0.77
Yb	2.16	1.79	0.34	0.39	1.88	1.61	5.15
Lu	0.33	0.30	0.05	0.06	0.30	0.23	0.76
Y	21.74	17.48	3.94	5.29	22.00	19.71	57.30
∑REE	146.84	135.80	40.26	52.69	184.25	233.33	240.84
LREE	111.51	107.02	33.34	43.53	147.16	199.47	146.73
HREE	13.59	11.30	2.98	3.87	15.09	14.15	36.81
La/Sm	3.76	4.34	3.40	4.42	3.43	4.51	0.79
Ce/Y	5.64	6.77	8.85	8.82	7.21	11.49	2.36
δEu	0.61	0.67	0.99	1.03	0.60	0.60	0.45
(La/Yb)_N	8.35	9.97	15.10	19.06	12.11	20.58	2.19
Sr/Y	15.67	18.29	109.14	72.21	19.59	20.84	6.40
Rb/Sr	0.34	0.45	0.11	0.11	0.31	0.40	0.32
注：(La/Yb)_N为La/Nb对球粒陨石标准化的值.

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表 3 滇西花岗岩类岩体及包体Sr-Nd同位素数据

Table 3. Sr-Nd isotopic data of granitoids and enclaves in West Yunnan

样号	岩性	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ	(⁸⁷Sr/⁸⁶Sr)_i	Sm(10^-6)
YL14-3	花岗闪长岩	145	320	1.308	0.713 613	2	0.709 4	3.78
YL15-2	二长花岗岩	47.7	430	0.32	0.705 261	2	0.7040	1.39
GK35-1	花岗闪长岩	133	431	0.892	0.713 088	2	0.710 2	6.11
GK35-2	花岗闪长岩	167	421	1.151	0.713 689	3	0.709 9	6.77
GK35-3	二长闪长质包体岩	119	367	0.937	0.713 576	2	0.710 5	13.10

样号	岩性	Nd(10^-6)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	2σ	(¹⁴³Nd/¹⁴⁴Nd)_i	ε_Nd(t)	T_DM(Ga)
YL14-3	花岗闪长岩	20	0.114 3	0.512 216	2	0.512	-5.85	1.43
YL15-2	二长花岗岩	7.15	0.117 5	0.512 494	7	0.512 3	-0.169	1.04
GK35-1	花岗闪长岩	30.4	0.121 5	0.512 177	1	0.512	-6.79	1.61
GK35-2	花岗闪长岩	36	0.113 7	0.512 139	2	0.512	-7.30	1.54
GK35-3	二长闪长质包体岩	47.1	0.168 1	0.512 259	1	0.512	-6.56	2.97

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