Transcript igneous rocks - Heritage Collegiate

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Volcanic
Properties
Spur of
the moment
According
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The dominant factor affecting
crystal size.
What is rate of cooling?
A factor affecting the crystal size.
(Involves silica)
What is the amount of silica?
A factor affecting the crystal size.
(Involves gases)
What is the amount of dissolved
gas?
A high amount of this in
magma results in greater
viscosity.
What is silica content?
This tends to increase the
fluidity of magma.
What is dissolved gas?
Rocks formed from the
crystallization of magma.
What are igneous rocks?
The formation and growth of a
crystalline solid from a liquid or
gase.
What is crystallization?
The size, shape and distribution
of the particles that collectively
constitute a rock.
What is texture?
The measure of a fluids
resistance to flow.
What is viscosity?
One of the primary factors
determining how eruptive a
volcano is.
What is temperature?
This series illustrates the
relationships between magma and
the minerals crystallizing from it
during the formation of igneous
rocks.
What is Bowen’s Reaction
Series?
A group of igneous rocks
showing the rock is composed
almost entirely of lightcoloured silicates.
What are felsic rocks?
A group of igneous rocks
showing the rock contains
substantial dark silicate minerals
and calcium-rich plagioclase
feldspar.
What are mafic rocks?
A group of igneous rocks in
which the rocks contain at least
25% of dark silicate minerals.
What are intermediate rocks?
A group of igneous rocks
containing mostly olivine and
pyroxene.
What are ultramafic rocks?
A chain of volcanic islands
located a few hundred
kilometres from a trench.
What is a volcanic island arc?
Mountains formed in part by
igneous activity associated
with the subduction of oceanic
lithosphere beneath a
continent.
What is a continental
volcanic arc?
A long narrow trough bounded
by normal faults.
What is a rift valley?
A mass of hotter mantle that
ascends towards the surface
where it may lead to igneous
activity.
What is mantle plume?
Igneous activity that occurs
within a tectonic plate away
from the plate boundaries.
What is intraplate volcanism?
What is a pyroclastic
texture?
What is a pegmatitic texture?
What is pumice?
What is magma?
What is glass?