论文部分内容阅读
金佛寺岩体为北祁连华力西早期形成的一个较大的复式深成岩基,主要岩石类型为二长花岗岩、黑云二长花岗岩和正长花岗岩,为高钾钙碱性岩系,具高钾、高铝和低钛的特点;REE分布模式为弱Eu异常;在Peace的Rb-Y-Nb图解中位于后碰撞花岗岩类区。岩体的同位素锆石U-Pb年龄为345.0±75.0Ma,代表其形成时代为晚泥盆世。综合分析,该深成岩体不是形成于主碰撞造山期,而是形成于陆内块体之间的继续会聚方式下的后碰撞造山期。
The Jinfosi rock mass is a large complex deep plutonic rock formed in the early Waili West of the North Qilian. The main rock types are monzogranite, biotite monzogranite and orthoclase granite, and are high-K calc-alkaline rock series with high potassium, High aluminum and low titanium; REE distribution patterns are weak Eu anomalies; and in Peace's Rb-Y-Nb scheme, they are located in the area of post-collision granites. The isotopic zircon U-Pb age of the rock mass is 345.0 ± 75.0Ma, indicating that the formation age is Late Devonian. According to the comprehensive analysis, the deep pluton is not formed during the main collision orogeny, but formed in the post-collisional orogeny under continuous convergence between intracontinental blocks.