| 洪文武.大兴安岭北段喀喇其花岗斑岩体地球化学特征、锆石U-Pb年龄及构造背景[J].地质找矿论丛,2023,38(2):209-214 |
| 大兴安岭北段喀喇其花岗斑岩体地球化学特征、锆石U-Pb年龄及构造背景 |
| Geochemical characteristis, zircon U-Pb age and tectonic setting of Kalaqi granitic porphyre in northern Daxinganling mountain |
| 投稿时间：2022-08-17 |
| DOI：10.6053/j.issn.1001-1412.2023.02.010 |
| 中文关键词: 花岗岩 地球化学 锆石U-Pb年龄 早白垩世 喀喇其地区 内蒙古 |
| 英文关键词:Granite geochemistry zircon U-Pb age Early Cretaceous Epoch Kalaqi area Inner Mongolia |
| 基金项目:内蒙古自治区地勘基金项目(编号:NMKD2014-20)资助。 |
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| 中文摘要: |
| 本文对大兴安岭北部喀喇其花岗斑岩体进行了岩石学、地球化学及锆石U-Pb年代学的研究,探讨了其形成的构造背景。结果表明:喀喇其花岗斑岩体锆石U-Pb年龄为132 Ma±1 Ma,表明其形成时代应为早白垩世晚期;岩石具有高钾钙碱性系列,过铝质特征;稀土元素属于轻稀土富集型,分布模式为右倾、左陡右平型式,具有较明显的Eu负异常特征。认为该花岗岩为铝质A型花岗岩,属于地壳岩石部分熔融的产物;该期岩浆侵位活动受蒙古—鄂霍茨克构造体系影响,形成于后造山大陆弧或后碰撞弧环境。 |
| 英文摘要: |
| This paper deals with petrology, geochemistry and zircon U-Pb age of Kalaqi granitic porphyre in northern Daxinganling mountain and discusses tectonic setting of the porphyre. The U-Pb dating age is 132 Ma±1 Ma corresponding to Early Cretaceous Epoch. The geochemical data are characterized by high K calc-alkalinity, paraaluminous material, LREE enrichment. The REE pattern is left leaning, right flatting with evident negative Eu anomaly. It belongs to paraaluminous A type granite and is the product of patially melted crystal material. The magma emplacement is influenced by Mogolia-Okhotsk tectonic system and emplaced in post orogenic continental arc or post collisional arc environment. |
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