地质通报2018，Vol.37Issue(5)：853-862,10.
大兴安岭扎兰屯地区晚奥陶世石英闪长岩体岩石地球化学特征及其地质意义
Petrogeochemistry of the Late Ordovician quartz diorite in Zhalantun area of Da Hinggan Mountains and its geological significance
摘要
Abstract
Yinhe rock mass is divided into two parts (north and south) by the Yinhe River system,and the age of southern rock mass (named Ercun rock mass) is different fiom that of the northern rock mass.The Ercun intrusive body is mainly composed of quartz diorite-tonalite.The LA-ICP-MS zircon U-Pb age of the quartz diorite is 444.0 ± 4.6Ma,suggesting Late Ordovician.The chemical composition of the rock is relatively rich in sodium and poor in potassium,and Na2O/K2O ratio is higher than 1 (1.73～3.17),suggesting the potassium calc-alkaline series.The rocks are rich in LREE,depleted in HREE,and enriched with LILE,Rb,Ba,and K,with significant losses of HFSE such as Nb,Ta,P and Ti.Mineral composition and petrological geochemical characteristics indicate that it should belong to type Ⅰ granite.The age and tectonic setting of the rock mass is similar to that of the Duobaoshan island arc igneous rock,which provides a new constraint for the southwest extension of the Duobaoshan island arc.关键词
石英闪长岩/地球化学/奥陶纪/多宝山岛弧/大兴安岭Key words
quartz diorite/geochemistry/Ordovician/Duobaoshan arc/Da Hinggan Mountains分类
天文与地球科学引用本文复制引用
马庆,刘建峰,迟效国..大兴安岭扎兰屯地区晚奥陶世石英闪长岩体岩石地球化学特征及其地质意义[J].地质通报,2018,37(5):853-862,10.基金项目
国家自然科学基金项目《内蒙古东南部早—中三叠世镁铁质火山岩的成因及地质意义》(批准号:41472055)和中国地质调查局项目《兴蒙造山带关键地区构造格架与廊带地质调查》(编号:DD20160201-01) （批准号:41472055）
