EARTH 10 Lecture Notes - Lecture 7: Deception Island, Stratovolcano, Metamorphism
Document Summary
Erebus - continuously erupting since observation in the 70s, stratovolcano. Sidley - highest volcano in aa (4,285 m) Caldera - large cauldron-like depression forms following the evacuation of a magma chamber/reservoir. Metamorphic rocks: original mineralogy, texture, or composition has been changed by effects of temperature, pressure, or gain/loss of chemical components. Foliation: parallel alignment of micas and others to make layering. Slaty cleavage: parallel fractures along foliation planes. Metamorphism: process by which elevated temperatures and other environmental changes transforms rocks and minerals. Contact = along magma intrusions, little to no deformation. Regional = most widespread, covers large areas, due to tectonic processes, Burial = deep burial in sedimentary basins, no deformation places like subduction zones. Sedimentary rocks: formed by accumulation and cementation of mineral grains by wind, water, or ice transported to the site of deposition or by chemical precipitation under normal conditions basically, weather or erosion. Clastic: composed of fragments of weathered rocks (ex: sandstone)
