扬子陆核崆岭杂岩太古宙地壳演化

Crustal Evolution in Archean for the Kongling Complex in the Yangtze Craton Nucleus

扬子陆核黄陵穹隆出露了目前扬子克拉通已知的最古老结晶基底——崆岭杂岩,是了解扬子克拉通太古宙地壳形成与演化的理想窗口。本文将近年来崆岭杂岩太古宙岩石的锆石U-Pb年代学、Hf同位素以及地球化学研究成果进行了总结,揭示了扬子陆核太古宙岩石时空分布规律及地壳演化的动力学过程进行了约束。结果表明,扬子陆核地壳演化过程可分为始太古代原始地壳形成与演化、中太古代早期地壳生长、中太古代晚期加厚地壳熔融、新太古代地壳生长与再造以及新太古代末地壳岩石变质改造等五个阶段,对应了太古宙地质演化的五个阶段。

The Kongling Complex exposed in the Huangling Dome is the known oldest crystalline basement in the Yangtze Craton nucleus, thus being an ideal window for understanding the formation and evolution of Yangtze Craton Archean continental crust. This paper summarized the research achievement on Archean Kongling Complex through zircon U-Pb chronology, Hf isotope and geochemistry methods in recent years,and revealed the temporal and spatial distribution rules of Archean Yangtze nucleus rocks and constrained the geodynamic processes of crustal evolution. It is concluded that the formation and evolution has been divided into five periods, namely the formation and evolution of the primitive crust in the Eoarchean, the crustal growth in the early Mesoarchean, the melting of thickened crust during the late Mesoarchean, the growth and reformation of crust in the Neoarchean, and the metamorphism of crustal rocks at the late Neoarchean,corresponding to the five stages of the geological evolution of the Archean.