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• W3188049806 abstract "云南镇沅地区位于哀牢山构造带中段，是古特提斯哀牢山洋关闭及碰撞造山的关键部位。本文对该地区出露的花岗斑岩进行了年代学、岩石地球化学与同位素地球化学研究。锆石U-Pb年代学给出加权平均年龄为253.3±2.0Ma，表明花岗斑岩形成于晚二叠世。3个花岗斑岩脉共5个样品分析结果表明，其SiO₂含量65.30%~70.79%，全碱含量（K₂O+Na₂O）3.53%~4.39%，Al₂O₃含量13.42%~16.40%，为高钾钙碱性亚碱性系列岩石，成分上与花岗闪长岩类似，为S型花岗岩。稀土元素含量较低，轻重稀土分异程度较高，稀土配分曲线为右倾，无明显Ce异常，具弱负Eu异常，微量元素配分曲线为右倾，大离子亲石元素相对富集，高场强元素相对亏损，与典型地壳相一致。锆石Hf同位素<i>ε</i>_Hf（<i>t</i>）为-1.0~4.1，显示岩浆源区为亏损地幔和古老地壳物质部分熔融。岩石大地构造环境分析表明，该花岗斑岩形成于晚二叠世同碰撞构造环境。" @default.
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• W3188049806 date "2021-01-01" @default.
• W3188049806 modified "2023-10-14" @default.
• W3188049806 title "U-Pb chronology, Lithogeochemistry and tectonic significance of Late Permain granite porphyry in Zhenyuan gold deposit, the middle section of Ailaoshan" @default.
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• W3188049806 doi "https://doi.org/10.18654/1000-0569/2021.06.03" @default.
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