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青藏高原羌塘中部蓝片岩的地球化学特征及其构造意义
引用本文:邓希光 AnYIN.青藏高原羌塘中部蓝片岩的地球化学特征及其构造意义[J].岩石学报,2002,18(4):517-525.
作者姓名:邓希光  AnYIN
作者单位:1. 中国科学院地质与地球物理研究所岩石圈构造演化开放研究实验室,北京,100029;中国科学院广洲地球化学研究所,广洲,510640
2. 中国科学院地质与地球物理研究所岩石圈构造演化开放研究实验室,北京,100029
3. Department of Earth and Space Sciences,University of California,Los Angeles,CA 90095-156702,U.S.A.
基金项目:国家重点基础研究专项 ( G1 9980 4 0 80 0 )经费资助,中科院青藏高原研究项目 ( KZ951 - A 1 - 2 0 4 KZ95T- 0 6 ),国家博士后基金“西藏中部冈玛日蓝片岩的地球化学及年代学研究”成果
摘    要:青藏高原羌塘中部的冈玛日-桃形错地区蓝片岩被认为是板块构造边界的产物,通过对其主量元素、微量元素和稀土元素的地球化学特征的综合研究,其原岩属于洋岛型碱性玄武岩。再结合该地区的地质研究,表明在该地区存在一个古提斯洋,可以作为晚古生代冈瓦纳与劳亚大陆的分界线。

关 键 词:蓝片岩  地球化学特征  洋岛型碱性玄武岩  古特提斯洋  青藏高原  晚古生代  稀土元素
文章编号:1000-0569/2002/018(04)-0517-25
修稿时间:2000年1月17日

Geochem ical characteristics of the blueschists and its tectonic significance in the cen tral Qiangtang area, Tibet
DENG XiGuang,DING Lin,LIU XiaoHan,An YIN,Paul A KAPP,M ichael A MURPHY and Craig E MANNING . Laboratory of Lithosphere Tectonic Evolution.Geochem ical characteristics of the blueschists and its tectonic significance in the cen tral Qiangtang area, Tibet[J].Acta Petrologica Sinica,2002,18(4):517-525.
Authors:DENG XiGuang  DING Lin  LIU XiaoHan  An YIN  Paul A KAPP  M ichael A MURPHY and Craig E MANNING Laboratory of Lithosphere Tectonic Evolution
Institution:DENG XiGuang,DING Lin,LIU XiaoHan,An YIN,Paul A KAPP,M ichael A MURPHY and Craig E MANNING . Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophy sics,Chinese Academy of Sciences,Beijing,Chin,. Guangzhou Institute of Ceochemistry,Chinese Acaelemy of Sciences,Guangzhou,Chin,. Department of Earth and Space Sciences,University of Californi,Los Angeles,CA -,U.S.A.
Abstract:Blueschists are considered as the mark of plate tectonic boundary in the Gangmar -Taoxing Co area, central Qiangtang, Tibet. Based on geochemical characteristic s of major, trace and rare earth elements and the geochemical diagram, the proto lith of blueschists belongs to alkali basalt that is a skin to intraplate ocean island basalts, and formed on seamount-like structures under an intraplate plum e. Together with the geological features, it shows that it presents a Palaeo-Te thyan ocean in the central Qiangtang area. Therefore, the area may represent the boundary between Gondwana and Laurasia continents during the Late Paleozoic per iod.
Keywords:Blueschist  Geochemical characteristics  Oceanic island alkali basalt  Palaeo-T ethyan ocean  Tibet
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