Graded bedding 4. Metamorphic rocks result from changes in temperature and from changes in presssure and from changes in chemistry of their pore fluids. Thes changes produce new minerals, new textures, and new structures within the rock body. During metamorphism, new minerals grow in the direction of least stress, producing a planar rock structure called foliation. The major types of metamorphic rocks are slate, schist, gneiss, quartzite, marble, amphibolite, metaconglomerate, and hornfels.
Regional metamorphism develops in the roots of mountain belts along convergent plate boundaries.
Contact metamorphism is a local phonomenon associated with thermal and chemical changes near the contacts of igneous intrusions. Along faults Agents of Metamorphism, Metamorphic Processes Act in combo or all at once 1. Meta conglomerate 5.