GEOS 1004 Lecture Notes - Lecture 11: Metamorphic Rock, Magma Chamber, Subduction
Document Summary
Lecture 11: consequences of tectonics: the rock cycle i. The rock cycle: three types of rocks form from each other due to tectonic motions and surface processes. Driven by earth"s internal heat engine, energy from the sun. When rock is melted, the new rock that forms is igneous. Intrusive form in magma chamber below the surface. Metamorphic rock minerals recrystallize (while remaining solid) under high heat and pressure into new minerals/rocks; maintain equilibrium. They get transported (carried) by water, wind, ice, or just gravity; this is called sediment. Sedimentary rock: sediment is deposited physically (sand, gravel) or chemically (ions, like salt), buried by later sediment, then hardened into rock. The rock cycle: melt and re-solidify = igneous rock cook in solid state = metamorphic rock weather, erode, deposit = sedimentary rock. Any type of rock can become another type of rock. For example, any type of rock can become a sedimentary rock through steps; like a grinding mill.
