北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义

何宇; 赵宇洁; 张文祥; 王浩; 周光颜; 吴元保

doi:10.3799/dqkx.2017.597

北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义

doi: 10.3799/dqkx.2017.597

何宇^1,2,,
赵宇洁^1,2,
张文祥^1,2,
王浩^3,4,
周光颜^1,2,
吴元保^1,2, ,

1.
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
2.
中国地质大学地球科学学院, 湖北武汉 430074
3.
中国科学院岩石圈演化国家重点实验室, 北京 100029
4.
中国科学院地质与地球物理研究所, 北京 100029

基金项目:

国家自然科学基金项目 41273035

国家重点基础研究发展计划("973"计划)项目 2015CB856106

国家自然科学基金项目 41625008

国家自然科学基金项目 41173016

详细信息

作者简介:
何宇(1994-), 男, 硕士研究生, 主要从事造山带地球化学方面的研究.

通讯作者:
吴元保

中图分类号: P597
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- 被引次数: 0
出版历程
- 收稿日期: 2017-10-24
- 刊出日期: 2018-02-15

Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications

He Yu^{1,2
,},
Zhao Yujie^1,2,
Zhang Wenxiang^1,2,
Wang Hao^3,4,
Zhou Guangyan^1,2,
Wu Yuanbao^{1,2
, ,}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Lithospheric Evolution, Chinese Academy of Sciences, Beijing 100029, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 北秦岭地区的早古生代超高压变质作用是整个秦岭-桐柏-红安-大别-苏鲁造山带内最古老的超高压变质记录, 代表华南与华北板块之间最早的一期增生碰撞事件, 然而目前对于该地区早古生代的构造演化过程仍存在较大争议.对北秦岭官坡超高压榴辉岩中的一个长英质脉体开展了详细的锆石形态学、微量元素和U-Pb年代学研究.结果表明, 脉体中的锆石呈自形的棱柱状晶形, 发育弱的振荡环带、面状分带或无明显分带特征, 具有高的HREE、Y、U含量, 低的Th含量和Th/U比值, 说明锆石生长自含水熔体.另外, 这些变质锆石具有LREE亏损、HREE相对富集的配分模式以及明显的Eu负异常, 表明含水熔体形成于角闪岩相退变质过程.锆石的²⁰⁶Pb/²³⁸U加权平均年龄为494±10 Ma (MSWD=2.2), 与北秦岭超高压变质作用的峰期年龄(490.4±5.8 Ma)在误差范围内基本一致.北秦岭地体经历深俯冲作用之后发生快速折返, 并在折返过程中发生角闪岩相退变质作用诱发俯冲板片部分熔融产生含水熔体.
- 北秦岭 /
- 长英质脉体 /
- 锆石U-Pb /
- 锆石微量元素 /
- 快速折返 /
- 地球化学 /
- 地质年代学
Abstract: The Early Paleozoic high pressure (HP) to ultrahigh pressure (UHP) metamorphism in the North Qinling (NQ) terrane preserves the oldest UHP record in the whole Qinling-Tongbai-Hong'an-Dabie-Sulu orogenic belt and thus registers the first accretionary collision process between the South China block (SCB) and the North China block (NCB).However, its evolution processes remain the subject of heated debate.This paper presents an integrated study of CL image, trace elements, and U-Pb age of zircons from a felsic vein within a UHP eclogite outcrop from the Guanpo area, NQ terrane.Zircons from the vein are euhedral in shape, displaying oscillatory, planar or no zoning, high U but low Th contents resulting in low Th/U ratios, indicating that they precipitated from hydrous melts responsible for the vein formation.In addition, these metamorphic zircons are characterized by low LREE contents, relatively high HREE patterns, and significant negative Eu anomalies, suggesting the hydrous melts formed during the amphibolite-facies retrogression.The weighted mean ²⁰⁶Pb/²³⁸U age of 494±10 Ma of these zircons is similar to the age of the peak UHP metamorphism (490.4±5.8 Ma) of the NQ unit, within the analytical error.Based on the above observations, we suggest that the NQ terrane underwent fast exhumation after deep subduction in the Early Paleozoic, and released hydrous melts derived from partial melting during exhumation, which was triggered by the significant amphibolite-faices retrogression.
- North Qinling /
- felsic vein /
- zircon U-Pb age /
- zircon trace element /
- fast exhumation /
- geochemistry /
- geochronology

HTML全文

图 1 北秦岭地区地质简图

NQ.北秦岭地区, SQ.南秦岭地区, TB.桐柏地区, HA.红安地区, DB.大别地区, SL.苏鲁地区; 据Wang et al.(2014)修改

Fig. 1. Geological sketch of the North Qinling terrane

下载: 全尺寸图片幻灯片

图 2 北秦岭长英质脉样品11QL98野外及显微结构照片

Mus.白云母; Qtz.石英; Pl.斜长石

Fig. 2. Field photographs and micrographs of felsic vein 11QL98 in the North Qinling terrane

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图 3 北秦岭长英质脉样品11QL98中典型锆石的阴极发光图像

Fig. 3. CL images of typical zircon crystals in felsic vein 11QL98 in the North Qinling terrane

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图 4 北秦岭长英质脉样品11QL98锆石U-Pb年龄谐和图

Fig. 4. The concordia diagram for U-Pb ages of zircon grains in felsic vein 11QL98 from the North Qinling terrane

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图 5 北秦岭长英质脉样品11QL98锆石球粒陨石标准化稀土元素配分模式

球粒陨石标准化值据McDonough and Sun(1995)

Fig. 5. The chondrite-normalized REE pattern of zircon grains in felsic vein 11QL98 from the North Qinling terrane

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表 1 北秦岭长英质脉样品11QL98 SIMS锆石U-Pb年龄测定结果

Table 1. Zircon U-Pb isotopic data obtained by SIMS for felsic vein 11QL98 from the North Qinling terrane

分析点	U(10^-6)	Th(10^-6)	Th/U	f₂₀₆(%)	²⁰⁷Pb/²⁰⁶Pb	±σ(Ma)(%)	²⁰⁷Pb/²³⁵U	±σ(Ma)(%)	²⁰⁶Pb/²³⁸U	±σ(Ma)(%)	²⁰⁷Pb/²⁰⁶Pb	±σ(Ma)	²⁰⁷Pb/²³⁵U	±σ(Ma)	²⁰⁶Pb/²³⁸U	±σ(Ma)
1	704	1.44	0.002	0.14	0.056 08	1.45	0.529 24	2.11	0.068 4	1.53	455.4	31.9	431.3	7.4	426.8	6.3
2	3 130	20.4	0.007	0.72	0.056 62	1.06	0.584 30	1.85	0.074 9	1.51	476.6	23.3	467.2	6.9	465.3	6.8
3	1 862	5.38	0.003	0.20	0.057 60	0.74	0.615 33	1.67	0.077 5	1.50	514.4	16.2	486.9	6.5	481.1	7.0
4	2 576	2.29	0.001	0.39	0.056 85	0.86	0.615 13	1.73	0.078 5	1.50	485.8	18.8	486.8	6.7	487.0	7.0
5	1 332	26.0	0.020	0.08	0.057 34	0.78	0.622 88	1.69	0.078 8	1.50	504.6	17.0	491.7	6.6	488.9	7.1
6	298	0.48	0.002	0.05	0.056 35	1.52	0.616 52	2.13	0.079 4	1.50	466.0	33.2	487.7	8.3	492.3	7.1
7	3 018	4.14	0.001	0.02	0.056 98	0.53	0.632 25	1.59	0.080 5	1.50	490.9	11.7	497.5	6.3	498.9	7.2
8	1 873	44.0	0.023	0.11	0.056 93	0.67	0.640 58	1.64	0.081 6	1.50	488.9	14.7	502.7	6.5	505.7	7.3
9	4 797	10.4	0.002	0.21	0.057 39	0.53	0.653 35	1.59	0.082 6	1.50	506.4	11.6	510.5	6.4	511.5	7.4

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表 2 北秦岭长英质脉样品11QL98中锆石微量元素(10^-6)分析结果

Table 2. Trace elements (10^-6) analyses for zircon in felsic vein 11QL98 from the North Qinling terrane

分析点	Y	Nb	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	Th	U	Ti	T(℃)^†	∑REE	∑HREE	(Yb/Gd)_N	δEu
1	2 955	2.29	2.75	10.1	1.45	8.99	6.67	3.08	46.6	20.5	248	87.8	381	73.0	707	126	17 838	1.70	45.9	2 484	17.3	800	1 723	1 690	18.8	0.39
2	471	0.96	1.35	5.24	0.98	5.85	3.38	3.43	6.65	2.44	30.8	13.6	75.0	18.5	214	48.2	11 456	0.33	5.35	1 062	6.20	703	429	409	39.8	2.17
3	997	0.72	0.18	0.83	0.11	0.79	0.67	0.33	5.15	3.07	55.2	27.9	161	39.2	471	105	14 487	0.27	2.41	1480	4.00	667	870	868	113	0.39
4	82.3	0.17	0.09	0.54	0.13	0.50	0.70	0.23	1.63	0.47	6.17	2.29	11.0	2.45	29.0	6.10	14 033	0.19	1.81	632	2.84	640	61.3	59.1	22.0	0.64
5	1 804	1.19	0.97	5.31	0.57	3.94	3.12	4.27	31.1	12.9	150	52.9	241	50.8	517	97.1	13 673	0.80	19.5	820	11.5	760	1 171	1 153	20.5	0.86
6	1 780	0.92	0.21	2.31	0.23	1.42	2.12	1.70	23.1	10.8	139	52.3	243	50.1	527	103	13 494	0.78	16.9	705	11.1	756	1 156	1 148	28.1	0.46
7	1 025	0.83	1.11	4.65	0.60	5.52	2.49	1.51	8.96	3.99	62.6	29.6	167	43.1	528	116	13 147	0.32	6.71	1 341	7.04	714	975	959	72.8	0.87
注：†T值据Ferry and Watson (2007)锆石中Ti含量温度计计算.

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