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

作　　者：ZHANGHongfei NigelHarris RandyParrish ZHANGLi ZHAOZidan 

机构地区：[1]FacultyofEarthSciences,ChinaUniversityofGeosciences,Wuhan430074.China [2]DepartmentofEarthSciences,TheOpenUniversity,MiltonKeynes,MK76AA,UK [3]NERCIsotopeGeosciencesLaboratory,BritishGeologicalSurvey,Nottingham,NG125GG,UK [4]SchoolotEarthScienceandLandResources.ChinaUniversityofGeosciences,Beijing100083,China

出　　处：《Chinese Science Bulletin》2004年第19期2087-2092,共6页

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.

关 键 词：U-Pb年龄测定法 沙江 淡色花岗岩 喜马拉雅山 地质学 

分 类 号：P588.121[天文地球—岩石学] P942.76[天文地球—地质学]