Concepts of metamorphism, metamorphic reaction, prograde and retro – metamorphisms.
变的一般概念、变反应、进变和退变。
Concepts of metamorphism, metamorphic reaction, prograde and retro – metamorphisms.
变的一般概念、变反应、进变和退变。
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的结构,在区域性变(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的物基础,区域变及混合化作用、构造活动是硼矿形成的必要条件。
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,其造分别为火山造、碳酸盐造及碎屑造。
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号煤层属高变无烟煤,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变作用的主要过程。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的叠加改造。
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