metamorphism

Concepts of metamorphism, metamorphic reaction, prograde and retro – metamorphisms.

一般概念、反应、进和退。

It has a prismatic and splintery texture and is abundant in regionally metamorphosed (see metamorphism) rocks such as schists.

具有棱柱形和易碎裂结构，在区（参阅metamorphism）中非常丰富，如片。

Thus, the boron-bearing rock system and the magnesian rocks are the foundation of the borate deposits, whereas regional metamorphism and migmatitization and tectonism are the necessary conditions.

含硼系、镁容矿石是硼矿形成物基础，区及混合化作用、构造活动是硼矿形成必要条件。

Xiaertai rock group,a set of metamorphic rock system in Xiaertai area,has experienced strong ductilebrittle deformation and then thermal contact metamorphism and dynamometamorphism in the late stage.

经原恢复可将下二台群分为三个组：盘岭组，黄顶子组及烧锅屯组，其原建造分别为火山建造、碳酸盐建造及碎屑建造。

No.39 coal is one of high-metamorphism anthracite with black color and near-metallic luster in which semibright coal and semidull coal are dominant lithetype and there is a little dull coal.

大田水井坑井田39号煤层属高无烟煤,灰黑色至黑色为主,似金属光泽,宏观煤类型以半亮型和半暗型为主,少量为暗淡型;

The former three stages reflect the major process of eclogite facies metamorphism and the latest stages the light overprinting of greenschist facies retrometamorphism at the shallow level of crust.

前三个阶段反映了榴辉相作用主要过程。后一阶段，反映了榴辉在地壳浅部层次绿片相环境下遭受轻微叠加改造。