摘要
U-Pb ages of zircon,monazite and xenotime from the Kude and the Sajia leucogranites in the Sajia dome of the North Hima- layan tectonic unit are measured using TIMS method. The results show that the magma emplacement ages for the Kude and the Sajia leu- cogranite are 27.5±0.5 and 14.4±0.2 Ma,respectively. Combined with published U-Pb data from the North Himalayan leu- cogranites,the time-span for the formation of the North Himalayan leucogranites is updated from 27.5 to 10 Ma,instead of previous 15 to 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 leu- cogranites have variety in their petrogenesis.
U-Pb ages of zircon,monazite and xenotime from the Kude and the Sajia leucogranites in the Sajia dome of the North Hima- layan tectonic unit are measured using TIMS method. The results show that the magma emplacement ages for the Kude and the Sajia leu- cogranite are 27.5±0.5 and 14.4±0.2 Ma,respectively. Combined with published U-Pb data from the North Himalayan leu- cogranites,the time-span for the formation of the North Himalayan leucogranites is updated from 27.5 to 10 Ma,instead of previous 15 to 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 leu- cogranites have variety in their petrogenesis.
