GEO 1111 Lecture Notes - Lecture 10: Overburden Pressure, Carbonate Minerals, Protolith

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Robert Jack Cornett

Document Summary

Abundance of rock on surface is sedimentary rocks (75%) Process which temperature, pressure, and chemical reactions alter mineral content and structure of pre-existing rocks. Solid phase reaction it is never really goes under magma or liquid form. Occur when temperature and pressure breaks some chemical bonds as it cannot break all because some bonds are stronger than others. Metamorphic rocks produced from igneous rocks, sedimentary rocks, and metamorphic rocks. Lithostatic/confining: pushes on rock equal from all direction, rock becomes more dense no shape change. Directed: pressure is greater in one direction, rock and mineral change in shape, new mineral growth aligns perpendicular to pressure = foliation. Fluid activity: h20, co2, enhances migration of ions. Composition of the rock is controlled by the protolith (parent rock) Relative amount of elements do not change, only mineral restructuring and crystal regrowth. Co2 is released and can diffuse from the rock. If co2 leaves reaction cannot go back when rock cools.