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| 东昆仑高Nb-Ta流纹岩的年代学、地球化学及成因 | |
| 引用本文： | 丁烁,黄慧,牛耀龄,赵志丹,喻学惠,莫宣学.东昆仑高Nb-Ta流纹岩的年代学、地球化学及成因[J].岩石学报,2011,27(12):3603-3614. |
| 作者姓名： | 丁烁 黄慧 牛耀龄 赵志丹 喻学惠 莫宣学 |
| 作者单位： | 1. 地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083 2. 地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083;Department of Earth Sciences, Durham University, Durham DH1 3LE 3. 地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院,北京100083;Department of Earth Sciences, Durham University, Durham DH1 3LE;兰州大学地质科学与矿产资源学院,兰州730000 |
| 基金项目： | 本文受国家973项目(2011CB403102、2009CB421002)、国家自然科学基金项目(91014003、40830317、41130314)和中国地质调查局工作项目(1212011121260、1212011121066)联合资助. |
| 摘 要： | 东昆仑高Nb-Ta流纹岩位于东昆仑造山带东段,其锆石U-Pb年龄为213Ma,该时期东昆仑造山带正处于俯冲-碰撞造山阶段的晚期.与同时期东昆仑地区的其它酸性火山岩及世界其它处于俯冲-碰撞造山阶段的流纹岩相比较,这一套流纹岩显示高硅、高钾,低铝、低钙,高Nb、Ta及强烈亏损Sr、Eu的独特地球化学特征.东昆仑高Nb-Ta流纹岩的Sr、Nd同位素组成显示该流纹岩可能具有分别来源于地幔和上地壳的两个端元组分.通过讨论,本文认为这套高Nb-Ta流纹岩可能由以下机制形成:地幔碱性玄武岩浆(具有高Nb-Ta的特征)侵入花岗闪长质地壳,并在上地壳某处停留,大量斜长石发生分离结晶,导致岩浆Eu-Sr的极度亏损；同时,幔源岩浆的侵入引起上地壳围岩部分熔融,从而受到上地壳混染.新生壳源岩浆与幔源岩浆混合,并进一步结晶分异演化,最终导致东昆仑高Nb-Ta流纹岩的形成. |
| 关 键 词： | 流纹岩 高Nb-Ta 东昆仑 |
| 收稿时间： | 5/1/2011 12:00:00 AM |
| 修稿时间： | 2011/6/28 0:00:00 |
Geochemistry, geochronology and petrogenesis of East Kunlun high Nb-Ta rhyolites |
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| DING Shuo,HUANG Hui,NIU YaoLing,ZHAO ZhiDan,YU XueHui and MO XuanXue.Geochemistry, geochronology and petrogenesis of East Kunlun high Nb-Ta rhyolites[J].Acta Petrologica Sinica,2011,27(12):3603-3614. | |
| Authors: | DING Shuo HUANG Hui NIU YaoLing ZHAO ZhiDan YU XueHui and MO XuanXue |
| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;Department of Earth Sciences, Durham University, Durham DH1 3LE, UK;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;Department of Earth Sciences, Durham University, Durham DH1 3LE, UK;School of Earth Sciences, Lanzhou University, Lanzhou 730000, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China |
| Abstract: | The East Kunlun high Nb-Ta rhyolite is located at the eastern end of the Kunlun orogenic belt. Zircon U-Pb analysis gives a magmatic age of about 213Ma, corresponding to the subduction/collision stage of the Kunlun Orogeny. Compared to the felsic volcanic rocks of similar ages in the region and rhyolites associated with subduction and collision zones worldwide, the rhyolite has high SiO2 and K2O, and low CaO and Al2O3. For trace elements, the rhyolite is enriched in Nb and Ta (with only a very weak negative... |
| Keywords: | Rhyolite High Nb-Ta East Kunlun |
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