青藏高原冈底斯带中部朱诺地区林子宗群火山岩锆石U-Pb年龄和地球化学特征

梁银平; 朱杰; 次邛; 何卫红; 张克信

doi:10.3799/dqkx.2010.021

青藏高原冈底斯带中部朱诺地区林子宗群火山岩锆石U-Pb年龄和地球化学特征

doi: 10.3799/dqkx.2010.021

梁银平^{1, 2},
朱杰³,
次邛⁴,
何卫红^{1, 2},
张克信^{1, 2, ,}

1.
中国地质大学生物与环境地质教育部重点实验室, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国地质大学资源学院, 湖北武汉 430074
4.
西藏地勘局第二地质大队, 西藏拉萨 850000

基金项目:

中国地质调查局项目矿调[2004]1-1

中国地质调查局项目 1212010610103

中国地质调查局项目 1212010733802

国家自然科学基金 40921062

国家自然科学基金 40830212

国家博士后科学基金 20070410971

详细信息

作者简介:
梁银平(1982-), 女, 博士研究生, 主要从事古生物学与地层学研究

通讯作者:
张克信, E-mail: kx_zhang@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: 2009-04-26
- 刊出日期: 2010-03-01

Zircon U-Pb Ages and Geochemistry of Volcanic Rock from Linzizong Group in Zhunuo Area in Middle Gangdise Belt, Tibet Plateau

LIANG Yin-ping^{1, 2},
ZHU Jie³,
CI Qiong⁴,
HE Wei-hong^{1, 2},
ZHANG Ke-xin^{1, 2
, ,}

1.
Key Laboratory of Geobiology and Environmental Geology, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
4.
No.2 Geological Party, Tibet Bureau of Geology and Exploration and Exploitation of Mineral Resources, Lhasa 850000, China

摘要

摘要: 林子宗火山岩是发育在青藏高原南部冈底斯带的古近纪火山岩, 被认为代表了新特提斯洋俯冲消减结束过渡到印度—亚洲大陆碰撞过程的产物, 其确切的时代对于限制印度—亚洲大陆的碰撞时限具有重要意义.对冈底斯带中部朱诺地区的林子宗火山岩进行了系统的LA-ICP-MS锆石U-Pb年代学、元素和Sr-Nd同位素地球化学研究, 获得的林子宗火山岩的典中组、年波组和帕那组LA-ICP-MS锆石U-Pb年龄分别为64.8±1.6 Ma、59.7±1.8 Ma和48.9±0.8 Ma.元素和同位素地球化学结果表明, 朱诺地区各组特征与区域上特征相似, 其中典中组和年波组火山岩属于钙碱性和高钾钙碱性系列, 具有岛弧火山岩特点; 帕那组出现大量的钾玄岩, 属于同碰撞火山岩.证明前人提出的雅鲁藏布江地区洋盆闭合和印度—亚洲大陆碰撞开始时间为50 Ma左右的观点.
- 锆石U-Pb年龄 /
- 地球化学 /
- 林子宗群火山岩 /
- 冈底斯中部
Abstract: The Paleogene volcanic rock in Linzizong Group is developed in the Gangdise belt, southern Tibet plateau and it is deemed to represent the result of Neo-Tethys from its subduction to the India-Asia collision. Its precise age is significant to constrain the time of the India-Asia collision. Herein a systematic study, including zircon U-Pb ages, major and trace elements and Sr-Nd isotopic geochemistry, has been done to volcanic rock from Linzizong Group in Zhunuo area in middle Gangdise belt. We obtain Linzizong Group volcanic rock LA-ICP-MS zircon U-Pb data showing the following ages: the Dianzhong Formation, 64.8±1.6 Ma, the Nianbo Formation, 59.7±1.8 Ma, the Pana Formation, 48.9±0.8 Ma. The data of elementary and isotopic geochemistry suggest that the characteristics of these formations in Zhunuo area are similar to regional characteristics. Among them, Dianzhong and Nianbo formations are calc-alkalic and high-K calc-alkalic rocks with characteristics of arc-island volcanic rocks. Pana Formation contains shoshonite and is syn-collision volcanic rock. It is proved that suture of the Yarlung Zangbo oceanic basin and the beginning of collision between India and Asia were about 50 Ma.
- zircon U-Pb age /
- geochemistry /
- Linzizong Group volcanic rock /
- middle Gangdise belt

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图 1 朱诺地区地质简图(a)及研究区构造位置图(b)(原图贾建称等，2005)

C₁y.永珠组；J₃K₁S.桑日群；K₁t.塔克那组；Q.第四系

Fig. 1. Simplied geological map of Zhunuo area (a) and the location of the study area

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图 2 研究区林子宗群火山岩锆石U-Pb谐和图解

Fig. 2. Zircon U-Pb concordian diagrams of Linzizong Group volcanic rocks in the study area

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图 3 研究区林子宗群火山岩锆石阴极发光图像

a.典中组样品D1253/39-1；b.年波组样品D1253/38-1；c.帕那组样品D1195/1；图中年龄值单位为Ma

Fig. 3. Cathodolum inescence images of zircons from Linzizong Group volcanic rocks in the study area

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图 4 研究区林子宗群火山岩地球化学图解(a据Le Bas et al., 1986; b据Rickwood, 1989; c, d据Sun and McDonough, 1989)

Fig. 4. Classification of Linzizong Group volcanic rocks in the study area

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图 5 林子宗群火山岩(⁸⁷Sr/⁸⁶Sr)_i-ε_Nd(t)图

空心图例引自Mo et al., 2008；实心图例为本次研究数据

Fig. 5. (⁸⁷Sr/⁸⁶Sr)_i-ε_Nd(t) plot of Linzizong Group volcanic rocks

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图 6 研究区林子宗群火山岩(La/Sm)_N-(Ba/La)_N和(Yb+Ta)-Rb图解(a据Othman et al., 1989; b据Pearce et al., 1984)

Fig. 6. (La/Sm)_N-(Ba/La)_N and (Yb+Ta)-Rb diagrams for Linzizong Group volcanic rocks in the study area

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表 1 研究区林子群宗火山岩样品概况

Table 1. Petrography of studied samples from Linzizong Group in Zhunuo area, southern Tibet

样品号	岩石名称	组	采样位置	岩性描述
D0988/1	流纹岩	帕那组	29°44′03″N 87°57′36″E	斑晶由石英(8%)、斜长石(10%)和黑云母(2%)组成，粒径0.5~1.5 mm；基质包括石英(22%)、正长石(3%)、绢云母(5%)和长英颗粒(50%)，粒径0.05~0.4 mm
D1039/1	晶屑玻屑凝灰岩	帕那组	29°48′45″N 87°25′15″E	晶屑15%、粒径0.3~1.5 mm，见石英(6%)、正长石(4%)和隧石(5%)等；基质约85%.其中含有弱重结晶微细玻屑(30%)、未结晶玻璃质和微细粒状铁质(55%)
D1195/1	流纹质玻屑晶屑凝灰岩	帕那组	29°39′02″N 87°24′40″E	斜长石晶屑8%、石英晶屑12%，粒径0.1~1.2 mm；流纹岩和安山岩岩屑 < 3%，粒径1~1.7 mm；隐晶状长英质集合体60%~68%、粒径0.01~0.2 mm；粒状方解石和斜状黑云母 < 5%.锆石为无色透明颗粒，少数为棕红色颗粒
D1250/1-1	流纹质晶屑玻屑凝灰岩	帕那组	29°48′59″N 87°25′15″E	斜长石晶屑10%、粒径0.2~2 mm，石英晶屑10%、黑云母晶屑3%、脱玻化粘土化玻屑80%~85%
D1240/1	晶屑岩屑凝灰岩	年波组	29°49′07″N 87°28′57″E	晶屑为石英(2%)和长石(3%)，粒径0.15~1.5 mm；岩屑为流纹岩岩屑(5%)和安山岩岩屑(5%)，粒径0.2~1 mm；基质包括微晶隧石(75%)、伊利石和绢云母(10%)
D1251/12-1	流纹质玻屑熔结凝灰岩	年波组	29°49′14″N 87°25′19″E	斜长石晶屑和正长石晶屑 < 2%，粒径0.5~1.2 mm；玻屑粒径 < 0.15 mm，见隐晶纤维状长英矿物(85%)和云雾状铁质玻屑(10%)、微粒状碳酸盐和石英(< 3%)
D1253/38-1	英安质岩屑晶屑凝灰岩	年波组	29°50′05″N 87°25′44″E	流纹岩2%~3%、安山岩岩屑10%，粒径1~1.7mm；斜长石晶屑8%和石英晶屑10%，粒径0.1~1.2 mm；隐晶状长英质集合体60%~65%，粒径0.01~0.2 mm；粒状方解石和斜状黑云母 < 5%；锆石为无色透明颗粒
D1253/39-1	流纹质含岩屑晶屑凝灰岩	典中组	29°50′05″N 87°25′44″E	晶屑含石英(6%)、正长石(2%)和斜长石(2%)，粒径0.15~1.5 mm；岩屑为流纹岩和安山岩(5%)，粒径0.2~1 mm；基质为隧石(75%)、伊利石和绢云母(10%).锆石为无色透明颗粒，少数为棕红色颗粒
D1032/1	流纹质含岩屑晶屑玻屑凝灰岩	典中组	29°48′41″N 87°27′19″E	岩屑10%、粒径为0.5~7 mm；石英晶屑35%、粒径为0.05~4 mm；黑云母晶屑粒径为0.2~0.5 mm；基质(50%)主要由隐晶长英矿物集合体组成
L02/1G	中酸性晶屑岩屑凝灰岩	典中组	29°41′16″N 87°39′10″E	晶屑粒径0.2~2.5 mm，含石英(5%)和斜长石(5%)；岩屑粒径2~5 mm，含细砂岩屑(5%)、凝灰岩屑(5%)和流纹岩屑(10%)；基质60%，由微粒硅质组成
L01/1G	蚀变微晶安山岩	典中组	29°41′22″N 87°39′06″E	斑晶15%、粒径0.3~1.5 mm，有斜长石(3%)、绿泥石(3%)和绿帘石(9%)；基质85%、粒径0.05~0.3 mm，包括斜长石(40%)、绢云母(5%)和钾长石(40%)

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表 2 研究区林子宗群火山岩锆石分析结果

Table 2. LA-ICP-MS zircon U-Pb data of Linzizong Group volcanic rocks in the study area

样品号及分析点号	含量(10^-6)			Th/U	同位素比值			t(Ma)
样品号及分析点号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb±1σ	²⁰⁷Pb/²³⁵U±1σ	²⁰⁶Pb/²³⁸U±1σ	²⁰⁶Pb/²³⁸U±1σ
D1253/39-1	(典中组)
01	8	275	290	0.95	0.046 05±0.003 23	0.056 29±0.003 88	0.008 87±0.000 12	56.9±0.7
02	24	2 129	1 612	1.32	0.046 95±0.001 24	0.066 20±0.001 71	0.010 23±0.000 12	65.6±0.8
03	5	443	375	1.18	0.045 54±0.002 47	0.060 88±0.003 24	0.009 70±0.000 14	62.2±0.9
04	3	257	170	1.51	0.049 55±0.005 23	0.064 58±0.006 73	0.009 45±0.000 19	61.0 ±1.0
05	8	511	556	0.92	0.063 57±0.003 32	0.082 78±0.004 22	0.009 45±0.000 15	60.6±1.0
06	3	269	222	1.21	0.047 52±0.003 81	0.064 53±0.005 11	0.009 85±0.000 16	63.0 ±1.0
07	6	529	412	1.28	0.048 30±0.002 82	0.067 11±0.003 86	0.010 08±0.000 25	64.7±1.0
08	8	345	505	0.68	0.050 13±0.002 55	0.078 87±0.003 92	0.011 41±0.000 27	73.0±1.0
09	18	1 204	1 313	0.92	0.049 34±0.001 59	0.069 09±0.002 18	0.010 15±0.000 12	65.1±0.8
10	5	345	367	0.94	0.047 79±0.003 50	0.068 25±0.004 92	0.010 36±0.000 18	66.0±1.0
11	4	171	282	0.61	0.050 93±0.003 58	0.075 55±0.005 23	0.010 76±0.000 17	69.0±1.0
12	10	1 053	452	2.33	0.091 76±0.003 21	0.134 30±0.004 55	0.010 61±0.000 15	68.0±1.0
13	4	274	248	1.10	0.049 30±0.003 68	0.072 63±0.005 33	0.010 68±0.000 18	68.0 ±1.0
14	8	979	405	2.42	0.055 84±0.002 78	0.077 67±0.003 78	0.010 09±0.000 15	64.7±1.0
15	2	150	84	1.79	0.043 55±0.008 27	0.061 92±0.011 68	0.010 31±0.000 16	66.0±2.0
D1253/38-1	(年波组)
01	4	298	245	1.22	0.048 97±0.002 50	0.067 65±0.003 38	0.010 02±0.000 14	64.3±0.9
02	40	3 200	2 974	1.08	0.053 98±0.001 31	0.067 85±0.001 60	0.009 12±0.000 10	58.5±0.6
03	8	998	562	1.78	0.047 71±0.001 97	0.059 03±0.002 38	0.008 97±0.000 12	57.6±0.8
04	16	1 206	1 161	1.04	0.048 39±0.002 89	0.064 62±0.003 76	0.009 68±0.000 13	62.1±0.8
05	173	12 630	7 953	1.59	0.089 93±0.013 71	0.088 61±0.013 39	0.007 15±0.000 14	45.9±0.9
06	4	138	141	0.98	0.058 91±0.011 80	0.076 65±0.015 25	0.009 44±0.000 22	60.1±1.0
07	5	415	243	1.71	0.078 65±0.007 68	0.101 86±0.009 75	0.009 79±0.000 18	60.1±1.0
08	3	275	184	1.49	0.046 05±0.004 30	0.057 12±0.005 26	0.009 00±0.000 14	57.7±0.9
09	6	523	344	1.52	0.046 34±0.003 54	0.061 85±0.004 64	0.009 68±0.000 13	62.1±0.8
D1195/1	(帕那组)
01	2	122	132	0.92	0.056 67±0.005 09	0.060 49±0.005 34	0.007 74±0.000 13	49.7 ±0.8
02	18	1 113	1 732	0.64	0.075 60±0.004 54	0.048 16±0.001 74	0.007 55±0.000 09	48.5±0.6
03	13	896	1 441	0.62	0.050 11±0.003 14	0.050 50±0.001 06	0.007 51±0.000 08	48.2±0.5
04	15	866	1 401	0.62	0.052 12±0.001 29	0.048 50±0.001 62	0.007 64±0.000 09	49.0±0.6
05	3	343	239	1.44	0.048 65±0.002 10	0.047 46±0.003 53	0.007 40±0.000 10	47.5±0.6
06	3	295	226	1.31	0.050 90±0.002 91	0.052 23±0.005 47	0.007 46±0.000 11	47.9±0.7
07	5	307	279	1.10	0.078 76±0.018 03	0.046 02±0.002 27	0.007 25±0.000 10	46.6±0.6
08	9	786	803	0.98	0.046 25±0.001 75	0.049 04±0.002 27	0.007 47±0.000 08	48.0±0.5
09	11	649	1 109	0.59	0.048 77±0.001 05	0.054 61±0.001 21	0.007 91±0.000 09	50.8±0.6
10	26	1 668	1 946	0.86	0.046 05±0.001 62	0.079 28±0.004 65	0.007 61±0.000 10	48.8±0.6
11	27	1 432	1 700	0.84	0.046 55±0.003 52	0.051 14±0.003 14	0.007 40±0.000 09	47.5±0.6
12	11	716	1 073	0.67	0.050 75±0.005 37	0.058 19±0.001 40	0.008 10±0.000 09	52.0±0.6
13	3	209	251	0.83	0.056 67±0.005 09	0.052 41±0.002 22	0.007 81±0.000 10	50.2±0.6
14	21	1 043	1 487	0.70	0.075 60±0.004 54	0.055 25±0.003 08	0.007 87±0.000 10	50.5±0.7
15	5	148	155	0.95	0.050 11±0.003 14	0.084 83±0.019 29	0.007 81±0.000 21	50.0±1.0

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表 3 研究区林子宗群火山岩样品主量元素(%)、微量元素(μg/g)含量和Sr-Nd同位素组成

Table 3. Major, trace element and Sr-Nd isotope compositions of samples from Linzizong group volcanic rocks in the study area

组名样号	典中组				年波组			帕那组
组名样号	D1032/1	D1253/39-1	L01/1G	L02/1G	D1253/38-1	D1240/1	D1251/12-1	D1250/1-1	D0988/1	D1039/1	D1195/1
SiO₂	76.92	76.73	61.31	72.52	76.17	72.09	74.36	69.58	71.72	75.95	77.63
TiO₂	0.16	0.14	1.05	0.31	0.13	0.23	0.11	0.37	0.26	0.15	0.11
Al₂O₃	12.70	11.67	15.89	14.06	12.35	13.15	12.72	14.69	13.76	12.27	11.81
MnO	0.02	0.04	0.16	0.12	0.02	0.07	0.02	0.04	0.06	0.03	0.07
MgO	0.31	0.25	0.64	0.35	0.19	0.67	0.08	0.63	0.29	0.21	0.13
CaO	0.32	1.04	4.23	2.47	0.29	1.21	0.43	0.57	1.07	0.89	0.20
Fe₂O₃	0.57	1.37	5.58	1.47	1.27	0.57	1.48	3.13	1.93	0.66	0.78
FeO	0.92	0.37	2.75	0.68	0.43	1.73	0.42	0.22	0.25	0.33	0.18
Na₂O	3.54	2.43	4.47	3.14	3.22	3.31	3.51	2.62	3.02	3.27	3.46
K₂O	2.68	3.74	2.04	3.35	4.26	3.60	5.46	6.11	5.57	5.54	4.80
P₂O₅	0.04	0.03	0.36	0.07	0.03	0.06	0.02	0.08	0.07	0.03	0.03
H₂O⁺	1.49	1.37	1.23	1.10	1.30	1.56	1.11	1.64	1.14	0.32	0.54
CO₂	0.14	0.64	0.10	0.12	0.10	0.73	0.14	0.08	0.69	0.20	0.12
Total	99.81	99.82	99.81	99.76	99.76	99.79	99.86	99.76	99.83	99.85	99.86
Na+K	6.22	7.48	7.69	6.51	6.49	6.91	8.97	8.73	8.59	8.81	8.26
K/Na	0.76	1.54	0.46	1.07	1.32	1.09	1.56	2.33	1.84	1.69	1.39
A/CNK	1.36	1.17	0.92	1.06	1.18	1.14	1.02	1.23	1.06	0.94	1.05
La	29.60	30.49			26.66	35.35	61.98	48.49	56.34	50.02	30.25
Ce	58.77	61.90			52.03	63.73	113.1	88.05	99.54	82.47	60.16
Pr	7.70	7.59			6.57	7.85	13.86	11.07	11.37	9.13	7.52
Nd	28.35	27.83			24.52	29.52	48.34	39.00	37.89	29.02	24.84
Sm	6.04	5.72			5.34	5.62	9.43	7.45	6.67	4.56	4.87
Eu	0.78	0.76			0.67	0.97	0.38	1.46	0.87	0.60	0.34
Gd	5.08	5.21			5.12	5.09	7.83	6.34	5.19	3.36	4.15
Tb	0.84	0.88			0.86	0.84	1.27	0.99	0.84	0.54	0.71
Dy	4.80	4.95			5.02	4.93	7.22	5.46	4.65	2.96	4.24
Ho	0.91	0.98			0.97	0.99	1.39	1.06	0.94	0.60	0.85
Er	2.44	2.77			2.77	2.86	3.91	3.05	2.63	1.75	2.55
Tm	0.36	0.44			0.43	0.46	0.59	0.48	0.41	0.30	0.42
Yb	2.06	2.76			2.86	2.92	3.66	3.11	2.50	1.92	2.79
Lu	0.28	0.39			0.38	0.43	0.52	0.46	0.36	0.29	0.42
Y	21.02	24.41			24.67	25.10	34.93	26.91	23.33	15.37	22.81
ΣREE	169.0	177.1			158.9	186.7	308.4	243.4	253.5	202.9	166.9
Eu/Eu^*	0.42	0.42			0.39	0.54	0.13	0.63	0.44	0.45	0.23
LREE/HREE	3.47	3.14			2.69	3.28	4.03	4.09	5.21	6.49	3.29
(La/Yb)_N	10.31	7.92			6.69	8.68	12.15	11.18	16.17	18.69	7.78
Sc	8.4	7.0			6.1	7.4	5.0	7.0	3.8	3.0	3.2
V	16.4	15.9			13.8	29.6	13.7	32.6	18.4	10.1	5.3
Cr	2.2	3.6			5.5	8.0	2.9	3.0	3.0	2.2	2.4
Co	1.8	2.6			2.7	3.2	1.5	4.4	3.4	2.2	0.76
Rb	132	163			162	176	184	137	226	182	183
Sr	145	82.7			80.7	150	65.8	147	149	72.9	55.2
Zr	131	116			130	156	255	284	202	102	189
Nb	8.9	7.6			8.6	8.1	16.8	13.0	16.1	11.0	18.0
Ba	591	620			740	724	107	1035	561	370	173
Hf	4.1	3.1			4.7	4.9	7.1	6.7	6.1	3.1	4.7
Ta	0.72	0.68			0.75	0.74	1.4	1.1	1.5	1.0	1.5
Pb	22.0	19.1			105	18.3	34.8	33.3	24.7	29.2	41.2
Th	16.3	14.6			12.2	13.5	18.7	22.1	28.7	20.8	18.4
U	1.7	1.6			1.8	1.0	3.7	2.7	3.1	2.7	3.5
Rb/Sr	0.91	1.99			2.01	1.17	2.80	0.93	1.52	2.50	3.32
I_Sr					0.709 33		0.704 87				0.705 43
I_Nd					0.512 14		0.512 34				0.512 51
ε_Nd(t)					-8.14		-4.39				-1.19

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