ASBOG FG Exam Reg Review Ch. 5 Rocks, Minerals, and Fossils Exam Review

ASBOG FG Exam Reg Review Ch. 5 Rocks, Minerals, and Fossils Exam Review Anion - ANS-A negatively charged ion Aphanitic - ANS-An igneous rock texture that refers to the grains not visible to the naked eye, and therefore indicative of fast cooling. Aureole - ANS-The zone of metamorphosed rock surrounding an igneous intrusion and showing the effects of contact metamorphism Bar - ANS-A unit of pressure equal to 10 to the 6th dynes/cm2, approximately one atmosphere (atm) Bowen's Reaction Series - ANS-The sequence of minerals that form in the process of fractional crystallization of a magma Burial Metamorphism - ANS-A type of low-grade regional metamorphism affecting sediments and interlayered volcanic rocks that has lower temperatures (200 to 450 C), without any influence of orogenesis or magmatic intrustion Cation - ANS-A positively charged ion Color Index - ANS-A number that represents the percent by weight or volume of dark-colored minerals in a rock. Contact Metamorphism - ANS-Metamorphism associated with the intrusion of an igneous mass. Metamorphic changes are caused principally by heat, but also by magma composition and deformation related to the intrusion. Pressures are relatively low (<3000 bars) while temperatures range from 200 to 1000 C. CONTINUES...