地质通报Issue(2)：283-291,9.
西藏双湖纳若地区花岗闪长岩LA-ICP-MS锆石U-Pb年龄与地球化学特征
LA-ICP-MS zircon U-Pb ages and Geochemical features of the granodio-rite in Naru area of Shuanghu, Tibet
摘要
Abstract
The suture zone of Longmu Cuo-Shuanghu is the east-west intermittent and unequal size of rock mass of granite, accord⁃ing to the regional geological survey at the scale of 1∶250000 of results, which belongs to Early Jurassic-Late Jurassic LA-ICP-MS Zircon U-Pb dating for two sample granodiorite in Naru area of Shuanghu, Tibet, obtaining 215.1±1.8Ma, 217.0±1.5Ma age, be⁃longing to late Triassic. The geochemistry research showed that the granodiorite belongs to partial aluminium-peraluminous high po⁃tassium calc alkalinegranite, light and heavy REE fractionation is obnious, the high field strength elements Nb, Ta, Ti strongly deplet⁃ed. Formed in the Longmu Co-Shuanghu paleo-Tethys ocean closed after the collision of the late stage of post collision extensional environment, the Longmu Co-Shuanghu suture zone represents the northward subduction of Tethys oceanic lithosphere, after the subducting slab break off, upwelling of the asthenospheric material, reduced pressure and rise temperature, spur the partial crust mate⁃rial melting, the granodiorite is partial melting of the crust material.关键词
双湖纳若地区/LA-ICP-MS锆石U-Pb年龄/花岗岩闪长岩/龙木错-双湖古特提斯洋Key words
Naruo in Shuanghu area, Tibet/LA-ICP-MS zircon U-Pb age/Granodiorite/Longmu Co-Shuanghu paleo-tethys ocean分类
天文与地球科学引用本文复制引用
刘波,彭智敏,耿全如,张璋,关俊雷..西藏双湖纳若地区花岗闪长岩LA-ICP-MS锆石U-Pb年龄与地球化学特征[J].地质通报,2015,(2):283-291,9.基金项目
中国地质调查局项目（编号12120113036500、1212011121262）、国家自然科学基金项目 （）
