福建沿海中生代变质带的混合岩化作用特征

    THE CHARACTERISTICS OF MIGMATIZATION OF THE MESOZOIC METAMORPHIC ZONE ALONG THE COAST OF FUJIAN PROVINCE

    • 摘要: 本文从岩石学、矿物学、交代结构、稀土元素地球化学方面阐述了不同混合岩类型的基本特征,并建立了三个混合岩化演变系列、论述了岩化特征。

       

      Abstract: The migmatization of the Mesozoic metamorphic zone along the coast of Fujian province is strong and rock types are complex, forming a complete, symmetrical intensity zoning which coincides with the framework of folds. In this paper, the authors deal with the basic characteristics of different types of migmatite with reference to petrology, mineralogy, metasomatic textures and REE geochemistry. On that basis three evolutionary series of migmatiza- tion are established. This paper discusses the features of changes in mineral composition, textures and structures and petrochemistry in the process of mig- matization of the rocks of various series. The granitic rocks widespread in the metamorphic zone may be classified into the zonal-marginal mixing type, the magma contamination type, the magma intrusion type, the volcanic intru- sion type. These granitic rocks have a close genetic relation to migmatite; they originated in different space and in different stages of the Mesozoic tec- tono-thermal cycle. It has been preliminarily ascertained that the migmati- zation of this zone possesses the characteristics of palingenetic migmatization. From a plate tectonic perspective, an attempt has been made to discuss the mechanism of migmatization.

       

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