北祁连玉龙滩地区寒武纪花岗岩地质地球化学特征
Discovery and Geological Significance of Early Permian Mafic Dike Intrusive into Tuolai Paleo-proterozic Rockin Yulongtan Region
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摘要: 玉龙滩地区寒武纪花岗岩主要岩石组合为二长花岗岩-石英正长岩-正长花岗岩，LA-MC-ICP-MS测定年龄分别为（502.1±1.7）Ma和（492.7±1.9）Ma，岩石具有过铝质、高钾（K2O>Na2O）特征，属于钙碱性系列。构造环境判别形成于同碰撞构造环境。综合分析后，认为寒武纪花岗岩应当是南部盆地扩张阶段，北部浪士当微地块遭受挤压导致陆壳部分熔融而形成的产物。Abstract: The Precambrian granite rock in Yulongtan region is composed ofmonzonitic granite, quartz syenite and yenogranite.The LA-MC-ICP-MA ages of this granite rockare (502.1+1.7)Ma and (492.7+1.9)Ma. This granite rocks show the geochemical characteristic of aluminum and potassium (K2O>Na2O), belonging to the calc-alkaline series.Tectonic environment discrimination shows that this granite rock was formed in the syn-collision tectonic environment.After comprehensively analyzing the related geological data, it is concluded that the Cambrian granite should be formed in the expansion phase of the basin in the south, and caused by the melting of the continental crust in the north when the Langshidang micro block was subjected to extrusion.
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Key words:
- Northern Qilian /
- Cambrian /
- granite /
- geochemistry
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