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U-Pb ages of Kude and Sajia leucogranites in Sajia dome from North Himalaya and their geological implications

机译:喜马拉雅北部萨加穹顶的库德和萨加白垩纪花岗岩的U-Pb年龄及其地质意义

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摘要

U-Pb ages of zircon, monazite and xenotime from the Kude and the Sajia leucogranites in the Sajia dome of the North Himalayan tectonic unit are measured using TIMS method. The results show that the magma emplacement ages for the Kude and the Sajia leucogranite are 27.5 ± 0.5 and 14.4±0.2 Ma, respectively. Combined with published U-Pb data from the North Himalayan leucogranites, the time-span for the formation of the North Himalayan leucogranites is updated from 27.5 to 10 Ma, instead of previous 15to 10 Ma. According to the U-Pb ages, the petrogenesis for the North Himalayan leucogranites can be constrained. It is suggested that the North Himalayan leucogranites have variety in their petrogenesis.
机译:利用TIMS方法测量了北部喜马拉雅构造单元萨迦穹顶中库德和萨迦白垩纪花岗岩,锆石,独居石和异铀矿的U-Pb年龄。结果表明,库德和萨加白垩纪花岗岩的岩浆沉积年龄分别为27.5±0.5 Ma和14.4±0.2 Ma。结合已发布的北喜马拉雅无色花岗岩的U-Pb数据,将北喜马拉雅无色花岗岩的形成时间范围从27.5更新为10 Ma,而不是以前的15至10 Ma。根据U-Pb年龄,可以限制北喜马拉雅无色花岗岩的成岩作用。有人认为,北喜马拉雅白云岩的成岩作用多种多样。

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