地质论评2026，Vol.72Issue(2)：343-354,12.DOI:10.16509/j.georeview.2025.06.015
北拉萨地体西段昂龙岗日角闪岩金红石与花岗闪长岩磷灰石U-Pb年龄及意义
Rutile andapatite U-Pb dating for the Anglonggangri amphibolite and granodiorite,western northern Lhasa subterrane,Xizang,and their geological significance
摘要
Abstract
The rutile and apatite U-Pb dating is one of the important methods in the study of diagenetic geochronology.However,there is often a phenomenon of inconsistency or decoupling between the U-Pb timing of rutile and apatite and zircon in the same rocks.It has caused the problems to effectively constraint the formation timing of rocks,especially in the region with multi-stage magmatism.In this study,the rutile and apatite U-Pb ages for the Anglonggangri amphibolite and granodiorite were dated.These ages also have large derivations from the corresponding zircon U-Pb ages.Based on previous studies on the granites developed in the Anglonggangri area,as well as the timing of magmatism in the neighboring areas of Zuozuo—Xiongba,this study analyzes the reasons for the inconsistent U-Pb ages between rutile and apatite and zircon.It is believed that the regionally widespread multi-stage magmatic activities have led to the reset of the U-Pb closed system of rutile and apatite in the Anglonggangri amphibolite and granodiorite.The U-Pb ages recorded by rutile and apatite reflect magmatism of the Late Cretaceous-Early Paleocene,Eocene,and Oligocene-Miocene,respectively.When using the rutile and apatite U-Pb ages to determine the timing of their hosted rocks in the areas with multi-stage magmatism,someone should be cautious and should carefully evaluate the real geological significances on the rutile and apatite U-Pb isotopic systems.关键词
金红石U-Pb年龄/磷灰石U-Pb年龄/昂龙岗日/拉萨地体Key words
rutile U-Pb dating/apatite U-Pb dating/Anglonggangri/Lhasa terrane引用本文复制引用
王焕,王春连,王庆飞,王立强..北拉萨地体西段昂龙岗日角闪岩金红石与花岗闪长岩磷灰石U-Pb年龄及意义[J].地质论评,2026,72(2):343-354,12.基金项目
本文为国家重点研发计划项目(编号:2021YFC2900100 （）
2023YFC2906605)、中国地质科学院基本科研业务费项目(编号:KK2306,KK2322)和中国地质调查局地质调查项目(编号:DD20230360)的成果. This paper is jointly by the National Key R&D Program of China(Nos.2021YFC2900100,2023YFC2906605),the Basic Research found of the Chinese Academy of Geological Sciences(Nos.KK2306,KK2322),and the Geological Survey Program of China Geological Survey(No.DD20230360) （编号:KK2306,KK2322）
