高级检索

    扬子陆核古元古代构造-岩浆演化

    Paleoproterozoic tectonic-magmatic evolution in the nucleus of the Yangtze Craton

    • 摘要: 扬子陆核黄陵穹隆是了解扬子克拉通前寒武纪地壳形成与演化的理想窗口。文章将近年来扬子陆核古元古代岩浆岩的锆石U-Pb年代学、Hf同位素以及地球化学特征进行了归纳总结,探讨了这些岩石的性质、成因及其形成的构造背景,以此对扬子陆核古元古代构造演化及其地球动力学过程进行约束。结果表明,扬子陆核古元古代构造-岩浆演化可划分为洋壳俯冲、弧陆碰撞和后碰撞伸展3个阶段,对应了俯冲增生、抬升剥蚀、高级变质和造山垮塌4个过程。

       

      Abstract: The Huangling Dome exposed in the nucleus of the Yangtze Craton is an ideal window for exploring the formation and evolution in the Precambrian continental crust of the craton. This paper summarized the research achievement on zircon U-Pb geochronology, Hf isotope and geochemical features of the Paleoproterozoic magmatic rocks in the nucleus of the Yangtze Craton, and discussed the nature, petrogenesis and tectonic setting of these rocks, so as to constrain the geodynamic and tectonic evolution processes in the nucleus of the Yangtze Craton during Paleoproterozoic. It is concluded that the Paleoproterozoic tectonic-magmatic evolution can be divided into four processes, namely the subduction and accretion, uplift and erosion, high-grade metamorphism, and orogenic collapse, which are associated with three stages: oceanic subduction, arc-continent collision, and post-collisional extension.

       

    /

    返回文章
    返回