A process of rock alteration or mineral formation brought about by the action of gases emitted from solidifying magma.
气成作用; 气成通过从岩浆凝固中释放气体的作用下引起的岩石改变或矿物形成的过程
solidifying chiefly as a minor intrusion, especially as a dike or sill, before reaching the earth's surface. Used of rocks.
半深成的, 浅成的在到达地球表面之前的主要作为小型岩石群固化的, 尤其象岩脉或岩床的凝固用于指岩石