Northernmost paleo-tethyan oceanic basin in Tibet:Geo-chronological evidence from ^(40)Ar/^(39)Ar age dating of Dur'ngoi ophiolite  

作　　者：CHEN Liang, SUN Yong, PEI Xianzhi, GAO Ming, FENG Tao, ZHANG Zhongqing & CHEN Wen1. Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China 2. Department of Geology, Northwest University, Xi’an, 710069, China 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China 

出　　处：《Chinese Science Bulletin》2001年第14期1203-1205,共3页

基　　金：This work was supported by the NationalNatural Science Foundation of China (Grant No. 49732080); the State Major Basic Research Development Program (Grant No. G1999075508) ;and the Natural Science Foundation of Northwest University (Grant No. 99NW28)

摘　　要：Whole rock 40Ar/39Ar age dating has been conducted on a basalt sample from Dur’ngoi ophiolite, Qinghai Province, which was reported to be the northernmost pa-leo-tethyan oceanic basin in Tibet. A high temperature pla-teau age (345.3±7.9 Ma) with an isochorn age (336.6±7.1 Ma) has been obtained, representing the eruption time of oceanic crust Considering related geological settings, the new age provides constraints on the northernmost pa-leo-tethyan suture zone in Tibet and the tectonic evolution of Paleo-tethys in Northeast Tibet and adjacent areas.Whole rock 40Ar/39Ar age dating has been conducted on a basalt sample from Dur'ngoi ophiolite, Qinghai Province, which was reported to be the northernmost pa-leo-tethyan oceanic basin in Tibet. A high temperature pla-teau age (345.3±7.9 Ma) with an isochorn age (336.6±7.1 Ma) has been obtained, representing the eruption time of oceanic crust Considering related geological settings, the new age provides constraints on the northernmost pa-leo-tethyan suture zone in Tibet and the tectonic evolution of Paleo-tethys in Northeast Tibet and adjacent areas.

关 键 词：Dur’ngoi ophlolite 40Ar -39Ar age Paleo-tethys. 

分 类 号：P736[天文地球—海洋地质]