GEOL 104 Lecture Notes - Lecture 5: Metamorphic Rock, Metasomatism, Metamorphism

• School: Queen's University
• Department: Geological Sciences and Geological Engineering
• Course: GEOL 104
• Professor: Daniel Layton- Matthews

Document Summary

Metamorphic rock type is largely dependent on the parent (original) rock. It is also depended on: temperature, pressure (amount and direction, time, higher temperature, pressure, and (often) a longer time period lead to higher-grade metamorphic rock. Types of metamorphism: there are two major types of metamorphism: regional and contract, there are also several sub-categories, including dynamic (cataclastic), metasomatic (hydrothermal), and shock (impact) Regional metamorphism occurs over a large area and is most often related to burial or plate tectonics. It often involves differential stress and tends to develop foliated rocks. Contact metamorphism occurs around intruding igneous bodies and involves high temperature and low pressure: metamorphism is restricted to the zone around the intruding body and the grade decreasing moving away from the intrusion. Host rock is re-crystallized and chemically altered by heat, pressure, and hydrothermal solutions emanating from intruding igneous body. Hot- iron-rich fluids moving through limestone creates aureoles of metal-rich deposits called skarns.