沉积与特提斯地质2023，Vol.43Issue(4)：734-746,13.DOI:10.19826/j.cnki.1009-3850.2021.08010
西藏聂荣微陆块变质基底新元古代—侏罗纪构造-岩浆事件:来自LA-ICP-MS锆石U-Pb定年的启示
Neoproterozoic-Jurassic Tectonic-Magmatic Events of the Metamorphic Basement in the Nyainrong Microcontinent of Tibet:Implications from Zircon LA-ICP-MS Geochronology
摘要
Abstract
In order to further research the Nyainrong microcontinent and the regional geological conditions of the Tibet Plateau,this paper systematically studied the geochronology of orthogneisses from the Nyainrong microcontinent in Tibet.We obtained the zircon U-Pb ages of nine samples by LA-ICP-MS,which were 502.8±1.2 Ma,532.7±3.4 Ma,833.2±2.8 Ma,734.8±3.3 Ma,495.3±1.7 Ma,496.6±2.0 Ma,495.1±1.2 Ma,803.8±2.8 Ma,811.7±2.8 Ma.To analyze these age results,we could divide these ages into three groups:830-730 Ma,580-470 Ma,185-160 Ma.It concludes that the metamorphic basement of Nyainrong microcontinent underwent three tectonic-magmatic events which occurred in the early Neoproterozoic,the late Neoproterozoic to the early Paleozoic,and the early-middle Jurassic.Combined with previous studies,it suggests that the Nyainrong microcontinent has Neoproterozoic basement and occurred the breakup of the Rodinia Supercontinent.The metamorphic basement underwent Pan-African and early Paleozoic tectonic events.Then it underwent early-middle Jurassic magmatic-metamorphic events which were related to the Bangong-Nujiang suture zone subduction and closure.关键词
聂荣微陆块/正片麻岩/锆石U-Pb年龄/新元古代—侏罗纪/青藏高原Key words
Nyainrong microcontinent/orthogneisses/zircon U-Pb age/Neoproterozoic-Jurassic/Tibet Plateau分类
天文与地球科学引用本文复制引用
陆露,钱程,赵珍,吴珍汉..西藏聂荣微陆块变质基底新元古代—侏罗纪构造-岩浆事件:来自LA-ICP-MS锆石U-Pb定年的启示[J].沉积与特提斯地质,2023,43(4):734-746,13.基金项目
中国地质调查局项目"羌塘盆地隆鄂尼-鄂斯玛地区油气地质构造调查"(DD20160161) （DD20160161）
辽宁省教育厅项目"西藏聂荣微陆块片麻岩年代格架重建"(LQN201915) （LQN201915）
沈阳师范大学博士引进人才科技项目启动基金项目"西藏聂荣微陆块侏罗纪花岗岩类研究"(BS201705) （BS201705）
