Unformatted text preview: um
rich …and the composition
of magma changes from ultramafic to andesitic. Intermediate,
(low silica) Partial melting creates a magma of a particular composition.
Cooling causes minerals
to crystallize and settle. Crystallizing
chamber A Magma
chamber B Partial melting
of country rock A basaltic magma chamber breaks through.
Mixing results in andesitic magma. Basaltic
chamber B Crystals may accumulate on the sides and roof of the chamber due to turbulence. Thought questions for this chapter
What observations would show that a pluton solidified
during fractional crystallization?
during 5. Igneous Processes
View Full Document
- Summer '08
- Igneous rocks, Basalt