GEO 101 Lecture Notes - Lecture 8: Schist, Mylonite, Phyllite

• School: University of Alabama
• Department: Geological Sciences
• Course: GEO 101
• Professor: William Lambert

Document Summary

Geology chapter 7: smith hall- constructed 1910. He (cid:271)elieved ala(cid:271)a(cid:373)a"s (cid:374)atural resour(cid:272)es (cid:894)(cid:272)oal, et(cid:272). (cid:895) (cid:272)ould help struggli(cid:374)g. Smith was on the 1917 ua football team. Metamorphism occurs without the rock first becoming a melt or a sediment. Example: igneous rock (granite) + high heat and pressure = metamorphic rock (gneiss: protolith- the original rock from which a metamorphic rock formed. One example is granite is the protolith for gneiss. Increase temperature- addition of heat helps to break chemical bonds, allowing atoms to move and form new bonds (new minerals) Increase pressure- tremendous pressures can cause atoms to pack more closely together, sometimes forming new minerals. Increase pressure and temperature- certain minerals are stable at specific temperatures and pressure. Changing these variables promote new mineral formation: compression and shear. Compression- a push or squeezing felt by a body. Shear- when one part of a material moves sideways, relative to another: results of compression and shear on mineral grains in rocks: