构造动力变质作用初论
A PRELIMINARY NOTE ON DYNAMOMETAMORPHISM DUE TO TECTONIC FORCES
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摘要: 本文提出了构造动力变质作用的基本概念。即在构造动力及其引发的动力热流共同作用下,岩石、矿物在构造运动中发生的形变、相变而呈现的变质作用。按构造动力变质作用的物理化学条件,动力变质岩的结构构造、动态重结晶和混合岩化作用、应力矿物共生组合关系及其空间分布等特征,将构造动力变质作用由弱到强划分为4个发展阶段和相应的4种基本变质类型——脆性、脆-塑性、塑性和动力热流变形变质,并论述了它们各自的基本特征。Abstract: In this article a basic concept on dynamometamorphism as a result of the action of tectonic forces is presented. This means the metamorphism caused by the deformation and factes transformations of rocks and minerals during the tectonic movement in response to the tectonic forces and the resulting rise of temperature. In terms of the texture and structure of the metamorphic rocks,the dynamic recrystallization and the migmatization,as well as the association of stress minerals and their spatial distribution etc.,there can be divided four stages in increasing grade of metamorphism and four corresponding metamorphic rock types as follows:(a)brittle deformation/metamorphism stage; (b)brittle-ductile transition deformation/metamorphic stage; (c)ductile deformation stage and (d) a fourth stage in which significant flow occurs due to local high heat flow stage. A brief description of the main features is here given.
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