论文部分内容阅读
西藏日土岩基三宫岩石序列由花岗闪长岩、英云闪长岩、石英闪长岩组成,富含包体,包体由砂板岩捕掳体、角闪石析离体和镁铁质暗色深源包体组成。寄主岩的地球化学性质显示高硅、铝不饱和-弱饱和、钙碱性-高钾钙碱性、富集轻稀土、弱-中等的铕异常,寄主岩地球化学协和图指示岩浆来源为壳幔混源,花岗闪长岩锆石~(206)Pb/~(238)U年龄为115.5±0.4Ma,该混源花岗岩序列与狮泉河带闭合过程中岛弧与班戈地体的碰撞有关。
The rock series of the Rizhimen base Sannongdi of Tibet is composed of granodiorite, diorite and quartz diorite, and is rich in inclusions. The inclusions are characterized by entrapment of sand-slate, detachment of amphibole and Magma iron dark dark source package body composition. The geochemical characteristics of the host rock show high silicon, aluminum unsaturated - weakly saturated, calc-alkaline-high-K calc-alkaline, enriched in light rare earths and weakly-moderately europium anomalies. The host rock geochemistry shows that the source of magma Mantle mixed source, the zircon ~ 206 Pb / 238 U ages of granodiorite are 115.5 ± 0.4Ma, and the sequence of mixed source granites is similar to that of island arc and Bangor terrestrial Collision related.