高压/超高压地体的形成和演化是一个非常复杂的地球动力学过程。新近的研究显示，挪威西片麻岩区超高压域内的Blåhø Nappe在加里东造山运动期间可能经历过两次俯冲-折返，然而目前还没有研究从变质演化的角度为该地质过程提供关键的P-T-t轨迹制约。本项目将针对Blåhø Nappe中的变质沉积-基性火成岩序列开展详细的岩石学、矿物学和年代学研究，重点探寻其经历多次俯冲-折返的矿物学标志和年代学证据并构建相应的P-T-t演化轨迹，基于此约束Blåhø Nappe在加里东造山运动间期的变质构造演化过程。通过实施本项目，将为深入认识和理解斯堪的纳维亚加里东造山带的形成与演化以及俯冲带的深部地球动力学过程提供重要科学依据。

The formation and evolution of high/ultrahigh-pressure terranes is a complex geodynamic process. Recent studies indicate that the Blåhø Nappe in the UHP domains, Western Gneiss Region, Norway, could have experienced two subduction-exhumation cycles during the Caledonian Orogeny. Nevertheless, metamorphic and P-T-t constraints have not been placed on this important geological process. This project is designed to conduct a comprehensive petrological, mineralogical, and geochronological study on meta-sedimentary and -magmatic rocks in the Blåhø Nappe, by focusing on searching for mineralogical and geochronological evidence on this multiple subduction-exhumation process and establishing corresponding P-T-t path. Based on these studies, tectonometamorphic evolution of the Blåhø Nappe during the Caledonian Orogeny will be constrained. This project will contribute to understanding the formation and evolution of the Scandinavian Caledonides as well as geodynamic processes operating in deep subduction zones.