试论熔结凝灰岩中塑性碎屑内晶质结构的成因

The Genesis of the Crystalline Textures in Plastical Fragments of Welded Tuffs

本文在岩相学研究的基础上,将熔结凝灰岩中的各种晶质结构分成两类,即浆屑和塑变玻屑等塑性碎屑中的晶质结构及刚性玻屑和火山微尘中的晶质结构。依据过冷结晶理论,结晶实验成果,本文重点讨论了浆屑和塑变玻屑等塑性碎屑中晶质结构的成因,指出它们不是由脱玻化形成的,而是由过冷结晶形成的。

Having study of the petrography of the welded tuffs, the author divided the crystalline textures in the welded turfs into two types, i. e., the crystalline texture in the plastical fragments, such as pumice and plastically deformed glass shard, and the texture in rigid glass shard and volcanic dust. Using the theory and the experimental achivement of supercooling crystallization, this paper puts the stress on discussing the genesis of the first type and suggests that it may be formed not by devitrification, but by supercooling crystallization.