Comparison of eastern paleo-Tethyan ophiolites and its geodynamic significance--Evidence from Dur'ngoi ophiolite  

作　　者：CHEN Liang1,2, SUN Yong1,2, PEI Xianzhi2, Feng Tao2 & Zhang Guowei2 1. Open Laboratory of Continental Dynamics, Ministry of Education, Northwest University, Xi抋n 710069, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 

出　　处：《Science China Earth Sciences》2004年第4期378-384,共7页中国科学（地球科学英文版）

基　　金：This project was supported by the NationalNatural Science Foundation of China (Grant No. 49732080) ;the Major Basic Research Development Program (Grant No.G1999075508).

摘　　要：Nd-Pb isotopic geochemistry of metabasalt from Dur抧goi ophiolite, Qinghai Prov-ince, NW China reveals the presence of DMM mixing with EMII components in its upper mantle source, which is comparable with present Indian MORB. Comparisons indicate that the geo-chemistry, chronology and source characteristics of Dur抧goi ophiolite coincide with Pa-leo-tethyan ophiolites from 揝anjiang?area. Together with evidences from regional geology in adjacent areas, this study proves that independent paleo-tethyan basins evolved contemporarily, the dynamics of which is attributed to the interaction of mantle plume with over-riding lithosphere.Nd-Pb isotopic geochemistry of metabasalt from Dur抧goi ophiolite, Qinghai Prov-ince, NW China reveals the presence of DMM mixing with EMII components in its upper mantle source, which is comparable with present Indian MORB. Comparisons indicate that the geo-chemistry, chronology and source characteristics of Dur抧goi ophiolite coincide with Pa-leo-tethyan ophiolites from 揝anjiang?area. Together with evidences from regional geology in adjacent areas, this study proves that independent paleo-tethyan basins evolved contemporarily, the dynamics of which is attributed to the interaction of mantle plume with over-riding lithosphere.

关 键 词：ophiolite  Paleo-Tethys  DUPAL anomaly  INDOSINIAN movement. 

分 类 号：P59[天文地球—地球化学]