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在西藏普兰县石英片岩中,利用SHRIMP U-Pb法测年发现4.1Ga碎屑锆石,该年龄为目前中国最老单颗粒碎屑锆石年龄,>4.0Ga两测点仅为一颗锆石中测得,其Th/U值介于0.76～0.86之间,属岩浆锆石.24颗锆石的35个测点的年龄值可分为六个年龄段,认为研究区可能至少存在六期古岩浆活动.这一发现,为研究青藏高原的地质演化提供了重要的年龄数据.
In the Pulan quartzite schist in Tibet, the age of 4.1Ga detrital zircon was found by SHRIMP U-Pb dating, which is the age of the oldest single-grain detritus in China. The measurement point of> 4.0Ga is only a zirconium Measured in stone, the Th / U values ranged from 0.76 to 0.86 and belonged to magmatic zircons. The age values of the 35 measuring points of 24 zircons can be divided into six age ranges and the study area may have at least six Period magmatic activity.This finding provides important age data for studying the geological evolution of the Qinghai-Tibet Plateau.