【摘要】 本文报道首次用单颗粒锆石U Pb同位素测年技术在我国西北阿尔金山东端古老花岗片麻岩中发现36 0 5± 43Ma的锆石。这是塔里木地块存在始太古代基底的重要证据 ,对研究该地区的地壳演化及其与我国东部和全球其他古老地块的对比研究具有重要的意义。更多还原

【Abstract】 zircons in granite-gneiss from the Eastern Altyn Mountains were dated by single grain zircon U-Pb dating method. The reliable zircon age of 3605 +/-43 Ma is the first convincing evidence for existence of an Early Archean basement in Tarim Block and has important significance for study of crustal and tectonic evolution in this area and comparative study with those in the Eastern China and the other places in the world.更多还原