摘要
阿鲁包格山花岗斑岩体地处天山-兴蒙造山系南缘,位于大兴安岭弧盆系锡林浩特岩浆弧之中,与中二叠统大石寨组上段地层和下白垩统白音高老组地层相邻。通过岩相学分析以及结合前人研究表明花岗斑岩与酸性熔岩及酸性火山碎屑岩的矿物组成与化学成分相似,指示两者为同源岩浆活动的产物。通过LA-ICP-MS U-Pb年龄测定的花岗斑岩的加权平均年龄值为(133.68±0.76) Ma(MSWD=1.04),略晚于下白垩统白音高老组酸性熔岩及酸性火山碎屑岩,表明了阿鲁包格山岩体与酸性熔岩及酸性火山碎屑岩为同期异相岩浆活动的产物。
Alubaogeshan granite-porphyry is located in the southern margin of Tianshan Xingmeng orogenic system,and in the Xilinhaote magmatic arc of the arc basin system of Da Hinggan Mountains. The petrographic analysis and previous research results show that the mineral composition and chemical composition of granite-porphyry acidic lava and acidic volcaniclastic rocks are similar,indicating they are products of homologous magmatic activities. The weighted average age of granite porphyry determined by LA-ICP-MS U-Pb dating is 133.68 Ma( +0.76 Ma)( MSWD = 1.04),slightly later than acidic lava and acid volcaniclastic rocks in the lower Cretaceous Baiyin Gao Lao formation,It is indicated that the Alubaogeshan intrusion,acidic lava and acidic volcaniclastic rocks are products formed by magmatism of synchronous and different lithofacies.
作者
刘传宝
王强
王建忠
郎欣欣
张猛
侯冠宇
LIU Chuan-bao;WANG Qiang;WANG Jian-zhong;LANG Xin-xin;ZHANG Meng;HOU Guan-yu(Inner Mongolia Tenth geological mineral Exploration Institute,Inner Mongolia,Chifehg 024000)
出处
《矿产勘查》
2018年第7期1316-1321,共6页
Mineral Exploration
基金
全国重要矿集区找矿预测的子项目内蒙古毛登矿集区找矿预测(编号:0747-1761SITCN072/3)资助
关键词
阿鲁宝格山
花岗斑岩
地质特征
年代学特征
Alubageshan
granite porphyry
geological features
chronological characteristics
