王粉丽;王海鹏;鲁红峰;于海峰;陈垚;杨欢;杨宾;仲米山;

• 1:辽宁省地质勘查院
• 2:辽宁省地质矿产研究院

摘要(Abstract)：

大兴安岭上其地区中生代花岗岩位于西伯利亚板块东南陆缘增生带中的乌尔其汉火山型被动陆缘与东乌旗-扎兰屯火山型被动陆缘接触带,该区构造研究可为大兴安岭的隆升研究提供信息。对研究区中生代花岗岩进行了系统的岩石地球化学特征及锆石U-Pb同位素年代学研究,并对其构造背景进行了讨论。LA-ICP-MS锆石U-Pb测年结果显示,这些花岗岩主要形成于早侏罗世和晚侏罗世,修正了前人把测区二长花岗岩、正长花岗岩划归晚石炭世的观点。岩石化学特征表明,研究区花岗岩均属于碱性岩,具有高钾、硅饱和、准铝质-弱铝质岩石的特征;系列判别图解显示研究区早侏罗世花岗岩为I型花岗岩,晚侏罗世花岗岩为高分异I型花岗岩,形成于后造山或碰撞后的构造环境,代表了伸展的大地构造背景。

关键词(KeyWords)： 中生代花岗岩;构造背景;大兴安岭;岩石地球化学特征

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局基础地质调查项目“内蒙古上其尼克其、年米尼克奇河、温布奇河、温河防火站四幅1∶5万区域地质矿产调查”(1212011220427)

作者(Author): 王粉丽;王海鹏;鲁红峰;于海峰;陈垚;杨欢;杨宾;仲米山;

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