1. Review Guide For Exam 2 Igneous Mineralogy Bowen’s Reaction Series
Silicate sub-classes; mineral structures
and compositions
Polytypes
Solid solutions
Twinning; simple , polysynthetic,
penetration
Zoning

2. Igneous Rocks
Textures and cooling history
Rock names; compositional
classification and mineralogical
Origin of magmas; decompression,
flux and thermal melting
Gas content and viscosity; controls
and consequences
Water content; role in melting and
explosive volcanism
Caldera formation

3. Tectonic environments
Basalts; MORB, OIB (intraplate), Flood
Basalts and LIPs, Subduction Zones
Know the controls on the production
of calc-alkaline versus tholeiitic
basaltic magmas
Understand layered intrusions and
processes of mineral accumulation
in a magma chamber

4. Understand Source, Path and Evolution !!!
Andesites and Granites; predominantly
at subduction zones
Andesites; fractional crystallization versus contamination
Granites; fractional crystallization versus crustal melting
Bi-modal volcanism
Understand Source, Path and
Evolution !!!