阿尔金江尕勒萨依榴辉岩和围岩锆石微区原位定年及其地质意义精选.pdfVIP

14 1 ( ( ) ; ) Vol. 14 No. 1 2007 1 Earth Science Frontiers ( China University of Geosciences, Beijing; eking University) Jan. 2007 LAIC MS 1 1 1 1, 2 1 1 刘! 良, ! 张安达 , ! 陈丹玲 , ! 杨家喜 , ! 罗金海 , ! 王! 超 1 , , 710069 2 , 710054 1 1 1 1,2 1 1 Liu Liang , ! Zhang Anda , ! Chen Danling , ! Yang Jiaxi , ! Luo Jinhai , ! Wang Chao 1State Key Laboratory of Continental Dy namics, Department of Geology , N orthwest University , X ian 710069, China 2College of Earth science and land esources, Changan University , X ian 710054, China Liu Liang, Zhang Anda, Chen Danling, et al. Implications based on LAICPMS zircon UPb ages of eclogite and its countr rock from Jianggalesa i area, Alt n Tagh.Earth Science Fr ontiers , 2007, 14(1) : 098107 Abstract: Based on Cathodoluminescence ( CL) and LAIC MS in situ trace element analyses and dating, this paper presents new zircon U b data for the eclogite and its country rock ( garnet biotite gneiss ) from the Jianggalesayi Area, Altyn Tagh, reveal interesting geodynamic implications. T he zircon grains in the eclogite mainly display homogeneous internal texture, w ith residual cores being found in a few grains. These residual cores show that they are typical magmat ic products, characterized by the enrichment in HREE and high ratio of Th/ U (mostly is larger than 04) . On the other hand the rims of these zircons and the homogeneous zircon grains show flat REE or slightly depleted H REE patterns, which are typical for metamorphic zircons coexis ting w ith garnet. The zircon grains of the garnetbiot ite gneiss display a coremantlerim internal structure. The cores show t he features of detrital zircons, wher