Igneous rocks Flashcards
2 main categories
Intrusive-form underground-course
Extrusive-form on earths surface-fine
Aphanitic texture
Fine grained rock
phaneritic
Course grained
What is the composition of plutons
made of quarts and feldspar
how do porphyritic textures form
when the magma cools very slowly
how does vesicular texture form
when gas bubbles are trapped in the lava and stay in place as it cools
What plutons are associated with volcanoes.
Batholiths
What are hot spots
what are plutons
Bodies of igneous rock intruded in country rock or formed in place or far beneath the surface Defined by volume and geomatry
Different types of magma and silica content
Felsic-high in silica
intermediate-medium
Mafic-Low
Partial melting and effect on magma
How does volcanic glass form
when lava cools rapidly, becoming an amorphous solid.
