包含变质岩分类三要素的主要变质岩分类表

变质岩分类的三要素是:变质岩的物质成分(化学成分、矿物成分)、变质岩的组构(结构、构造)和变质岩的成因(变质作用类型和形成变质岩的物理化学条件).由于变质岩的化学成分、矿物成分、组构特征和形成变质岩的地质环境十分复杂,致使至今尚无以变质岩分类三要素为基础的、内容比较完善的分类方案.本文中主要变质岩的分类是以其分类三要素为基础编制的,首次将不同成因的变质岩类并列于同一表中、将鉴定变质岩的主要标志性矿物成分和组构特征列入同一分类表中.该分类对鉴定变质岩石具有可操作性和实用性,分类表中涵盖了自然界主要的变质岩石.

Types of main metamorphic rocks by the composition fabric and genesis of metamorphic rocks

The three essential factors for classifying metamorphic rocks are composition (chemical and mineralogical), fabric (texture and structure) and genesis (types of metamorphism and physiochemical conditions for forming metamorphic rocks). So far, there is still not a perfect classification scheme based on the three essential factors due to the chemical, mineralogical and fabric characteristics, and the complex geological environments of metamorphic rocks. The classification scheme used in this paper is based on the three essential factors. For the first time, we put metamorphic rocks with different geneses into one classification scheme. We have also listed the main index mineral compositions and fabric characteristics into one classification scheme to indentify metamorphic rocks. Compared to previous schemes, this classification scheme is more useful and practicable, which has covered the main metamorphic rocks in nature.