Opening of the Tethys in southwest China and its significance to the breakup of East Gondwanaland in late Paleozoic:Evidence from SHRIMP U-Pb zircon analyses for the Garzêophiolite block  

作　　者：YANQuanren WANGZongqi LIUShuwen LIQiugen ZHANGHongyuan WANGTao LIUDunyi SHIYuruo JIANPing WANGJianguo ZHANGDehui ZHAOJian 

机构地区：[1]InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China//BeijingSHRIMPCenter,InstituteofGeology,ChineseAcademyofGeologicalSciences,aeijing100037,China [2]InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China [3]SchoolofEarthandSpaceSciences,PekingUniversity,Beijing100871,China [4]BeijingSHRIMPCenter,InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China [5]SchooloftheEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100029,China [6]InstituteofGeomechanics,ChineseAcademyofGeologicalSciences,Beijing100081,China

出　　处：《Chinese Science Bulletin》2005年第3期256-264,共9页

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.40472119 and 40172071);the Progranme of Excelent Young Scientists of the Ministry of Land and Resources,the Ministry of Science and Technology of the People's Republic of China(Grant No.2002CB412608);the China Geological Survey(Grant No.200313000057).

摘　　要：SHRIMP U-Pb zircon analyses for a gabbro sample from the Garzê ophiolite block yielded a mean 206Pb/238U age of 292±4 Ma, which indicated that the spread- ing time of the Garzê-Litang Tethys was most likely at the earliest Permian. Combined with previous studies, we sug- gest that the opening of the Tethys in southwest China was derived from breakup of the East Gondwanaland in the late Paleozoic.SHRIMP U-Pb zircon analyses for a gabbro sample from the Garze ophioliteblock yielded a mean ^(206)Pb/^(238)U age of 292 + - 4 Ma, which indicated that the spreading timeof the Garze-Litang Tethys was most likely at the earliest Permian. Combined with previous studies,we suggest that the opening of the Tethys in southwest China was derived from breakup of theGondwanaland in the late Paleozoic.

关 键 词：特提斯海 中国 冈瓦纳大陆 古生代 分析方法 蛇纹石 辉长岩 地球化学分析 

分 类 号：P588.125[天文地球—岩石学]