GLGY 209 Study Guide - Midterm Guide: Metamorphic Rock, Clastic Rock, Lithification
5 May 2019
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Eruptions are frequent: anhedral crystal face and crystal form. Don"t have enough room to grow and develop, therefore have the least smooth surfaces. Last to form during crystallization: aphanitic crystal size. Presence of small-sized crystals, which cannot be seen with the unaided eye. Minerals can only be seen through the rock when a section is cut out and put under a microscope. Formed through crystallization of molten matter which flows at the surface of the earth. Example: banded rhyolite: augite minerals, azurite, bacolith, basalt. Minerals in its composition are very large in size and numbers. To allow for intergrowth, there must be a discrete structure inside. Consists of collection of smaller igneous bodies. Over 100 square km of surface exposure. Crystallized magma chambers that are raised to surface due to crustal movement. Not all look the same: burial metamorphism. Originally formed rocks that remained at the surface of earth begin burial process.
