| 王玉平,武悦,张妍,吴文彬,李海洋,王晓亮.内蒙古赤峰市柴火沟正长花岗岩年代学、地球化学特征及地质意义[J].地质找矿论丛,2023,38(4):468-476 |
| 内蒙古赤峰市柴火沟正长花岗岩年代学、地球化学特征及地质意义 |
| Geochronology, geochemical characteristics of the orthoclase granite in Chaihuogou, Chifeng, Inner Mongolia and the geological significance |
| 投稿时间：2023-05-15 |
| DOI：10.6053/j.issn.1001-1412.2023.04.008 |
| 中文关键词: 柴火沟正长花岗岩 U-Pb年龄 侏罗纪 赤峰地区 内蒙古 |
| 英文关键词:Chaihuogou orthoclase granite U-Pb age Jurassic Period Chifeng region Inner Mongolia |
| 基金项目:内蒙古自治区地质勘查基金管理中心项目"内蒙古自治区赤峰市四道湾子等五幅1∶5万区域矿产地质调查"(编号:NMKD2012-14)资助。 |
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| 中文摘要: |
| 通过对内蒙古赤峰地区柴火沟正长花岗岩的岩相学观察、岩石地球化学测试和锆石U-Pb测年分析,其结果表明:柴火沟正长花岗岩锆石U-Pb年龄为168.49 Ma±0.78 Ma,形成于中侏罗世;岩体主量元素具有富Si、K、Na,贫Mg、Ca等特征,A/CNK值为0.94~1.06;微量元素具有Eu、Ba、P负异常,岩石具有较高的DI值,属于高分异I型花岗岩;柴火沟正长花岗岩形成于蒙古-鄂霍茨克缝合带闭合过程中的陆-陆碰撞环境。 |
| 英文摘要: |
| Petrographic observation, chronology and geochemical tests were carried out on Chaihuogou orthoclase granite in Chifeng area, Inner Mongolia. The zircon U-Pb age is 168.49 Ma±0.78 Ma, corresponding to Middle Jurassic epoch. The major elements is characterized by enrichment of Si, K, Na, and depletion of Mg, Ca with A/CNK values in range 0.94~1.06; the trace elements Eu, Ba, and P negative anomaly with high DI value indicating that the granite is a highly differentiated I-type granite. It is believed that the Chaihuogou syenite granite was formed in the continental collision environment during the closing process of the Mongol-Okhotsk suture zone according the petro-geochemical and regional geological characteristics. |
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