摘要
区域变质作用与花岗岩的形成具有不可分割的成因联系。区域变质岩、混合岩、交代花岗岩、侵入花岗岩四者均属同一作用(深成作用)过程不同发展阶段所形成的产物。南岭地区两个时期(晋宁旋回和加里东旋回)区域变质岩、混合岩和花岗岩的规律伴生与相互依存的关系,证明了这一客观规律的存在。不论交代花岗岩抑或侵入花岗岩,均是业已形成的花岗质岩浆冷凝结晶的产物。所谓花岗岩化,其确切涵义是指固态原岩经选择熔融转变为花岗岩浆的过程,是花岗岩类形成初期阶段(岩浆发生阶段)的特征作用。混合岩化则系花岗岩化过程的低级阶段,也可称为低级花岗岩化。成矿作用主要与这一演化系列的高级阶段所形成的侵入花岗岩,特别是地槽发展末期的后构造期侵入花岗岩密切相关。
The regional metamorphism and granite generation possess an undivi-ded genetic relation. Regional metamorphic rocks, migmatites, metasomaticgranites and intrusive granites are products formed in different developmen-tal stages of the same process (plutonic). The dependent relationshipshows a regular association among regional metamorphic rocks, migmatitesand granites of two periods (Jinling and Caledonian cycles) in southeas-tern China. Both metasomatic granites and intrusive granites are products formedby condensation and crystallization of granitic magma. The precise defini-tion of granitization is the Frccess of original rocks of the solid state re-forming granitic magma through selective melting. It is characterized bygranite generation during the early stage (magma generation). Migmatiza-tion is a lower-rank of granitization, which may be called lower-rankgranitization. Metallogenesis is primarily related to the product formed during thehigh-ranking stage of the evolutionary series-intrusive granites, especiallyto post-tectonic intrusive granites during the late stage of geosynclinaldevelopment.
关键词
花岗岩
区域变质
混合岩化
regional metamorphism
migmatization
granitization
granitoid
petrogenesis
South China
