西北地质2017，Vol.50Issue(4)：51-58,8.
大兴安岭北上其地区晚石炭世花岗岩类LA-ICP-MS锆石U-Pb测年及地质意义
LA-ICP-MS Zircon U-Pb Ages of Late Carboniferous Granites from Shangqi Area in Great Xing'an Range and its significance
摘要
Abstract
The Shangqi area ofGreat Xing'an Range is tectonically located at the Xing'an Block in the eastern part of the Xingmeng oregenic belt.Large quantities of late Carboniferous granitic rocks are distributed in this area.Thesegranitic rocks are mainly composed of the quartz diorite and quartz monzodiorite.The LA-ICP-MS U-Pb zircon dating has yielded an age of (315.9±2.1) Ma,showing that the granite was mainly emplaced in late Carboniferousperiod.The petrogeochemical characteristics show that these granites are high-potassium,Si-saturated and quasi-aluminous rocks,belonging to calc-alkaline series.Discrimination diagrams show that the late Carboniferous granite belongs to Ⅰ-type granite.These graniteswere formed in a post-orogenic or post-collisional tectonic setting,whichrepresents an extensional tectonic environment.The petrography,petrogeochemistry,chronology study and regional tectonic evolution reveal that these late Carboniferous intrusions from Shangqi area in Great Xing'an Range were formed under a tectonic setting from late-orogenic to post-orogenic extension during the collision between Xing'an and Songnen Massifs.关键词
晚石炭世/石英二长闪长岩/LA-ICP-MS/岩石地球化学特征/大兴安岭Key words
late Carboniferous/quartz monzodiorite/LA-ICP-MS/petrogeochemical characteristics/Great Xing'an Range分类
天文与地球科学引用本文复制引用
王粉丽,王海鹏,鲁红峰..大兴安岭北上其地区晚石炭世花岗岩类LA-ICP-MS锆石U-Pb测年及地质意义[J].西北地质,2017,50(4):51-58,8.基金项目
中国地质调查局国大调基础地质调查“内蒙古上其尼克其、年米尼克奇河、温布奇河、温河防火站等四幅1∶5万区域地质矿产调查”(1212011220427) （1212011220427）
