王艺龙;敖光;王海鹏;王忠江;王岐;仲米山;谭超;杨运来;李琢;牛明伟;柯坤家;

• 1:辽宁省地质勘查院
• 2:高分辨率对地观测系统辽宁地质资源环境应用与服务中心
• 3:中国地质大学(武汉)

摘要(Abstract)：

对大兴安岭中部索伦地区花岗岩进行了年代学和地球化学研究,探讨了其成因类型及构造环境。LAICP-MS锆石U-Pb定年结果显示,明水河林场、索伦马场、索伦镇岩体年龄分别为(136±1),(134±1),(128±1)Ma,形成于早白垩世。明水河林场岩体高硅、富碱,贫钙、镁、钛和磷,A/CNK介于0.83～0.90,具有强烈的Eu负异常(δEu=0.33～0.38),明显富集Rb、Th、U、K等元素而亏损Ba、Sr、P、Ti等元素,具有A型花岗岩的特征。索伦马场和索伦镇岩体属高钾钙碱性系列,A/CNK介于0.88～1.0,富集大离子亲石元素LILE和LREE,亏损高场强元素HFSE,显示高分异I型花岗岩的特征。岩石地球化学组成显示索伦地区花岗岩岩浆源区为新增生的年轻地壳物质部分熔融。结合晚中生代大兴安岭地区的构造演化特征,认为索伦地区花岗岩形成于张性构造背景,可能与古太平洋俯冲作用引起的板内伸展作用有关。

关键词(KeyWords)： A型花岗岩;I型花岗岩;早白垩世;索伦地区;大兴安岭中段

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1∶5万明水河林场、索伦马场、索伦幅区域地质矿产调查”(12120114013001)

作者(Author): 王艺龙;敖光;王海鹏;王忠江;王岐;仲米山;谭超;杨运来;李琢;牛明伟;柯坤家;

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