【摘要】 对青海省格尔木窑洞山地区四道沟侵入岩进行岩石学、岩石化学、微量元素的分析及研究,主要岩石类型有二长花岗岩、二云母二长花岗岩和白云母花岗岩等,SiO₂含量为65. 65%～77. 32%,K₂O、Na₂O分别含量为2.78%～7.73%和1.26%～5.78%,显示钙碱性系列特征,σ=0.61～2.07,Al₂O₃>CaO+K₂O+Na₂O,A,CNK=1. 09～2.48,为中高钾过铝质岩石。LREE/REE=3. 30～6.24,δEu=0.37～0. 56,均小于1,具明显的负铕异常。K、Rb、Ba、Th、Ce富集,其中Ba具负异常特征,Ta、Zr亏损,具碰撞花岗岩特征。由上述特征表明,窑洞山地区的晚奥陶世花岗岩具壳源花岗岩（S型）特征,是非典型碰撞型花岗岩,形成于岛弧或陆缘弧部位。同时在四道沟西侧的二云母二长花岗岩中获得（471±2）Ma LA-ICP-MS锆石U-Pb年龄,为东昆仑地区古生代多级构造—岩浆演化提供了精确的地质时代证据。更多还原

【Abstract】 The analysis and study of petrology, petrochemistry and trace elements of the Sidao gou in Yaodongshan area of Golmud City, Qinghai Province, the main rock types are monzonite granites, Biotite-Mus monzonite granites and muscovite granites, the rocks have the following chemical composition:siO₂= 65. 65%～77. 32%,K₂O and Na₂O are different between 2. 78% ～7. 73 %and 1. 26% ～5. 78 %, This indicates the granite rocks with the character of calcium alkalescence siries. σ = 0. 61 ～2.07,Al₂O₃>CaO+ K₂O+Na₂O,A/CNK = 1. 09 ～ 2. 48, They are medium-high potassium aluminum rocks. LREE/REE = 3. 30 ～ 6. 24,△Eu = 0. 37～ 0. 56, all less than 1, indicate Eu pronounced Obviously negative abnormalty. K, Rb, Ba, Th, Ce are abundant, of which Ba has negative abnormalty, Ta, Zr are loss-making, with collision granite characteristics. From the above characteristics, it is shown that the late Ordovician granites in the Yaodongshan area are Crustal granite（S-type granite）, Atypical Syn-Collision granite,formed in island arcs or continental margin arcs. At the same time, We took a sample of the Biotite-Mus monzonite granites in the Yaodongshan area to analys U-Pb age. The LA-ICP-MS U-Pb age analyses show that the granite ages of late Ordovician are（471±2）Ma, the zircon trace elements age provide accurately Geological Age on the Paleozoic multi-stage tectonic-magmatic events of the Eastern Kunlun area.更多还原