GEOL 1001 : Exam 2 Spring 2015
Document Summary
Concordant intrusion boundaries lie parallel to the country rock layers. Decompression melting as material rises and the pressure on it decreases, it spontaneously melts. Produces the greatest volume of magma anywhere on earth. Dike the major route of magma transport to the crust. Diorite (intermediate) less silica & dominated by plagioclase feldspar. Discordant intrusion plutons that cut across layers of country rock they intrude. (stocks/batholiths) Extrusive rock fast cooling, formed from erupted volcanos. Fractional crystallization crystals formed in a cooling magma are segregated from remaining rock. Gabbro coarse grained, dark gray intrusive rock. Granodiorite like granite, but instead has more plagioclase than orthoclase. (intermediate)(intrusive) Intermediate igneous rock between felsic/mafic in silica content. Intrusive igneous rock forced its way into surrounding rock (slow cooling) Magmatic differentiation a single melt can produce a wide variety of different igneous rocks. Ophiolite suites unusual assemblages of seafloor rocks that were found on land.
