锆石对地球早期地壳演化和构造体制转换的启示

锆石是研究早期地球演化的重要矿物之一,它的U-Pb年龄结合其微量元素以及同位素成分是反演寄主岩石成因乃至地球动力学背景的重要手段.本文从锆石矿物包裹体、微量元素、U-Pb同位素体系、Lu-Hf同位素、O同位素以及Si、Zr和Ti同位素这6个方面综述了近10年来前人取得的主要研究成果,总结了次生矿物包裹体可能产生的方式以...

The implications of zircon on the evolution of the early Earth crust and tectonic transformation

Zircon is one of the important minerals for studying the early Earth evolution, because its U-Pb age, trace elements and isotopic compositions can place important constraints on the petrogenesis and even the geodynamic background of host rocks. This article summarizes the main research results obtained in the past 10 years from six aspects: mineral inclusions in zircon, trace elements, U-Pb isotope system, Lu-Hf isotope, O isotope and Si, Zr and Ti isotopes. The previous studies have suggested different mechanisms of generation of secondary mineral inclusion and the restrictions of primary mineral inclusions on the early crustal composition, the relationship between the increase of S-type granites and the transformation of tectonic system, the mechanism and recognition of radioactive Pb enrichment, the mechanism of craton stability reflected by the Lu-Hf isotope,and the determination of the primary O isotope and its restriction on the early Earth hydrosphere state. The above research results show that zirconology is an indispensable and important research method for studying the evolution and tectonic system of the early Earth crust.