再论定向压力对岩体的影响——岩浆的压滤作用及其地质意义

THE EFFECTS OF THE ORIENTED PRESSURE ON ROCK MASSES AND SOME MINERALS—REEXPOSITION

摘要: 作者认为只有当岩浆缓慢冷却结晶到塑性阶段时,定向压力才能起作用,并且通过压滤方式,析出衍生塑性熔体,影响岩体的形态及造岩矿物的结晶习性,甚至形成岩浆岩韵律层理和矿床。

Abstract: With the removal of phenocrysts, fluids become less and less and the viscosity increases during slow cooling and crystallization. Once the fluids become a plastic mass, there will appear effects of stress on early phenocrysts, thus bringing about oriented arrangement and plastic or brittle deformation. Meanwhile relict plastic masses occurring among the phenocrysts will form mineral aggregates with a fine-grained mosaic crystalloblastic texture and elongated and venlike plastic quartz; moreover the elict plastic mass will be exsolved to form fine-grained rhythmic layerring due to pressure filtration, and even the usefull components will be further concentrated under the oriented pressure to form a mineral deposit.