GLGY 209 Study Guide - Final Guide: Syncline, Oxbow Lake, Neve Electronics
Document Summary
Meta(cid:373)o(cid:396)phis(cid:373) o(cid:272)(cid:272)u(cid:396)s : at pressures (p) and temperatures (t) much higher than those on the ea(cid:396)th(cid:859)s surface, but below pressure and temperature conditions that cause melting. Metamorphic rocks form in the middle and lower crust. Categories of metamorphic rocks: foliated (layered, non-foliated (non-descript, gives you an idea of the rock type and conditions that formed it) Metamorphic textures: foliated (progressive metamorphism of a shale) Slate phyllite schist gneiss migmatite. Slate: protolith: shale, elongated and platy minerals aligned and compressed, breaks smoothly along foliation planes, very fine grained, phyllite, micas start growing perpendicular to stress, shiny surface due to micas, fine grained. Schist: micas grow parallel, coarser than phyllite, will break along cleavage planes, often folded (ex. Some sedimentary structures (bedding, cross-bedding) survive the recrystallization: contact or regional metamorphism, marble, non-foliated recrystallized limestone, composed of calcite (caco2) Impurities result in secondary minerals, streaks and bands: these impurities are valuable in commercial marble quarries, contactor regional metamorphism, heat (t)
