孙吴地区中侏罗世白云母花岗岩的年_省略_对蒙古_鄂霍茨克洋闭合时间的限定_李宇.pdf

1000-0569 /2015 /031 (01)-0056-66 Acta Petrologica Sinica 岩石学报 孙吴地区中侏罗世白云母花岗岩的年代学与地球 * : - 化学 对蒙古 鄂霍茨克洋闭合时间的限定 ＊ 李宇1 丁磊磊2 许文良1＊ 王枫1 唐杰1 赵硕1 王子进1 1 2 1 ＊ 1 1 1 1 LI Yu ，DING LeiLei ，XU WenLiang ＊ ，WANG Feng ，TANG Jie ，ZHAO Shuo and WANG ZiJin 1. ， 130061 吉林大学地球科学学院 长春 2. ， 100029 中国科学院地质与地球物理研究所 北京 1. College of Earth Sciences，Jilin University ，Changchun 130061，China 2. Institute of Geology and Geophysics ，Chinese Academy of Sciences，Beijing 100029，China 2014-05-02 收稿，2014-10-29 改回. Li Y ，Ding LL ，Xu WL ，Wang F ，Tang J ，Zhao S and Wang ZJ. 2015. Geochronology and geochemistry of muscovite granite in Sunwu area ，NE China :Implications for the timing of closure of the Mongol-Okhotsk Ocean. Acta Petrologica :56 － 66 Sinica ，31 (1) Abstract Zircon U-Pb dating and whole-rock geochemical analyses are undertaken for the muscovite granite in Sunwu area ，NE China ，with the aim of constraining its formation time ，petrogenesis and the regional tectonic setting. Zircons from the muscovite granite in the study area are euhedral-subhedral in shape ，and display fine-scale oscillatory growth zoning ，indicating a magmatic origin. LA- ICP-MS zircon U-Pb dating indicates that the muscovite granite formed in the Middle Jurassic (～ 168Ma). The muscovite granites have SiO = 74. 61% ～ 80. 16% ，Al O = 10. 59% ～ 13. 90% ，Fe O = 0. 11% ～ 0. 30% ，and belong chemically to metaluminous- 2 2 3 2 3 peraluminous series (A /CNK = 0. 97 ～ 1. 13 ). In addition，these muscovite granites are e