Unit 3 MegaChart
Tectonic
Setting
Oc-Oc
Convergent
Oc-Cont
Convergent
Cont-Cont
Convergent
Oc
Divergent
Cont
Divergent
Transform
Oc
Hot Spot
Cont
Hot Spot
Denser plate
subducts- in
this case the
older and
colder plate is
densest
In this case the
oceanic plate is
denser
The plates
buckle up
against each
other, which
causes the
crust to
thicken
Ocean crust is
separating,
with new ocean
crust forming
at the rift
valley/midocean ridge
A continent is
rifting apart,
crust will thin
and eventually
form an ocean
basin
Two plates are
grinding past
each other – crust
is neither created
or destroyed
An area where
the mantle
below ocean
slab is
unusually hot
An area where
the mantle
below c
continental
slab is
unusually hot
Mafic to
intermediate
Felsic to
intermediate
Felsic
Mafic to
ultramafic
Felsic to mafic
XXXXXXXXXX
Mafic to
ultramafic
Felsic to mafic
Typical
Igneous Rx
Basalt
Gabbro
Rhyolite
Granite
Granite
Mafic to
ultramafic
All types
XXXXXXXXXX
Basalt
Gabbro
All types
Typical
Volcano(es)
Composite and
Cinder Cone
Composite and
Cinder Cone
Mid-ocean
ridges
Shield,
composite, and
cinder cone
Maybe some
“leaky” faults
Shield
Calderas
Typical
Eruption
Violent with
pyroclastic
flows
Violent with
pyroclastic
flows
Volcanoes
disappear once
ocean plate
completely
subducts and
crust thickens
XXXXXXXX
Lava flows –
pillow lavas
Violent with
pyroclastic
flows, or lava
flows
XXXXXXXXXX
Lava flows
Violent with
pyroclastics or
lava flows
Type of
Stress
Compression
Compression
Compression
Tension
Tension
Shear
XXXXXXXXX
XXXXXXXXX
Type of
Faults
Reverse
Thrust
Reverse
Thrust
Reverse
Thrust
Normal
Normal
Transform/Strikeslip/Lateral
Normal
Normal
Typical
Mountains
Volcanic Arc
forms on
overriding plate
Volcanic Arc
forms on
overriding plate
Divergent
Boundary
Mountains
Divergent
Boundary
Mountains
XXXXXXXXXX
Shield
volcanoes
Fault-Block or
Uplift
Do
Earthquakes
Occur?
YES
YES
-Continental
Collision Mtns
-Uplift
Mountains:
plateaus
YES
What is
happening
to plates?
Typical
Magma
YES
YES
YES
YES
YES
Other
Geologic
Features
-Deep ocean
trench
-Volcanic
islands
-Coral atolls
-Folds
-Accreted
terrain
-Ocean trench
-Volcanic
mountain
range
-Folds
-Accreted
terrain
-Large and very
tall mountain
range
-Folds
-Hydrothermal
vents
-Transform
Faults
-Fissures
-Rift valley
-Rift valley
-Hot springs
-Deep lakes
-Fissures and
flood basalts
-Fissures
-Offset landforms
-Volcanic
island chain
-Seamounts
-Coral atolls
-Geysers
-Hot springs
-Fissures and
flood basalts
-Faults
Example
Locations
Marianas
Trench, the
Caribbean
Islands
Cascade
Range, Andes
Mountains
Himalayas,
Appalachians
Mid-Atlantic
Ridge
East African
Rift Valley
San Andreas
Fault
Hawaii
Yellowstone