Download Section 10-4 Igneous rock features

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Transcript 
Section 10-4
Igneous rock features
Batholith

Batholith




Large intrusive rock
body
Hundreds kilometers
wide
Magma cools
underground
Old magma chamber
laccolith

Laccoliths are
somewhat large
intrusions that result
in uplift and folding of
the preexisting rocks
above the
intrusion. They are
also concordant types
of intrusions.

Dike –

Vertical intrusion that
cuts across rock layers
Shiprock volcanic neck and dike, symbols of
New Mexico geology,
west of Farmington, NM.
sill

Sill

Horizontal intrusion of
magma between
vertical layers or
cracks
Volcanic neck

Volcanic neck –


Hardened magma
inside of the vent
Volcanic cone is
eroded away leaving
the neck exposed
caldera


Top/crater of volcano
collapses in on itself
leaving a larger
crater.
Caldera lake –

Sometimes the crater
fills in with water
creating a lake
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