| 青藏高原拉萨地体北部的前寒武纪变质作用及构造意义 |
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| 引用本文： | 张泽明,董昕,耿官升,王伟,于飞,刘峰.青藏高原拉萨地体北部的前寒武纪变质作用及构造意义[J].地质学报,2010,84(4):449-456. |
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| 作者姓名： | 张泽明 董昕 耿官升 王伟 于飞 刘峰 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 中国地质大学研究生院,地球科学学院,武汉,430074 |
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| 基金项目： | 中国地质调查局地质调查项目，国家自然科学基金，中国地质大学(武汉)地质过程与矿物资源国家重点实验室项目 |
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| 摘 要： | 青藏高原南部拉萨地体中分布的角闪岩相至麻粒岩相变质岩一直被认为是前寒武纪变质基底,但并没有获得可靠的年代学证据。本文运用原位锆石U-Pb定年方法,在拉萨地体北部那果地区的变质岩中获得了约720Ma的变质年龄,从而证明拉萨地体北部在新古元代经历了角闪岩相变质作用和近同期的岩浆作用。基于这一成果和在拉萨地体中、南部高级变质岩中陆续获得的中、新生代变质年龄,对拉萨地体变质作用的时、空变化及其成因进行了初步探讨。
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| 关 键 词： | 拉萨地体 念青唐古拉岩群 锆石U-Pb年龄 前寒武纪变质作用 青藏高原 |
| 收稿时间： | 2009/12/20 0:00:00 |
| 修稿时间： | 2010/2/15 0:00:00 |
Precambrian Metamorphism of the Northern Lhasa Terrane, South Tibet and Its Tectonic Implications |
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| ZHANG Zeming,DONG Xin,GENG Guansheng,WANG Wei,YU Fei and LIU Feng.Precambrian Metamorphism of the Northern Lhasa Terrane, South Tibet and Its Tectonic Implications[J].Acta Geologica Sinica,2010,84(4):449-456. |
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| Authors: | ZHANG Zeming DONG Xin GENG Guansheng WANG Wei YU Fei and LIU Feng |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037;;Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037;;Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037;;Graduate School, China University of Geosciences, Wuhan, 430074;Graduate School, China University of Geosciences, Wuhan, 430074;Graduate School, China University of Geosciences, Wuhan, 430074 |
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| Abstract: | The amphibolite facies and granulite facies metamorphic rocks in the Lhasa terrane, south Tibet, were considered traditionally as the Precambrian metamorphic basement, but the related geochronological evidence is lack. In this paper, we report a metamorphic age of ~720 Ma obtained from zircons of a marble collected from the Naguo area of northern Lhasa terrane. This data, together with the coeval magmatism in the same area, indicate that the northern Lhasa terrane has been subjected to the Neo Paleozoic tectonic thermal event. Based on this result and some Mesozoic and Cenozoic ages obtained recently from the high grade metamorphic rocks in the central and southern segments of the Lhasa terrane, we propose a preliminary temporal and spatial evolution model for the multistage metamorphic processes of the Lhasa terrane. |
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| Keywords: | Lhasa terrane Precambrian metamorphism zircon U Pb dating southern Tibet |
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