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Tectonic Processes at Each Plate Boundary (Collision Zone (Neither of them…
Tectonic Processes at Each Plate Boundary
Destructive Plate Boundary
The oceanic plate subducts under the continental plate as it is much denser and heavier.
Continental plate: lighter, less dense, older (over 150 million years old)
Oceanic plate: Heavier, denser, younger, has ocean on top
These have a 10 - 400km focal depth.
It creates an ocean trench, fold mountain, composite volcano and earthquakes.
Example
: Nazca plate subducts under the South American plate creating the Andes Mountains.mountain, composite volcano and earthquakes.
Collision Zone
Neither of them subducts because they both have the same density.
Magma is being generated at depth but cools and solidifies beneath the surface so eruptions are very rare.
An Example of a collision zone is the Himalaya mountains (the Indo-Australian and the Eurasian plate). This is when the plates are the same density, so subduction is not possible. Instead, the plates have ‘crumpled’, creating enormous tectonic uplift in the form of the Himalaya and the Tibetan Plateau.
The plates are still slipping which means that earthquakes occur.
A collision zone is where two continental plates are in a collision together.
Transform Zone
It is on a conservative plate boundary
Earthquakes can occur often, e.g. San Francisco and the San Andreas fault
Transform zones are where the two plates are together and it consists of transform faults. These faults ‘join up’ sections of constructive plate boundary as they traverse the earth’s surface in a zig-zag pattern.
There is no volcanic activity as the plates slide past each other.
Constructive Plate Boundary
Both plates are oceanic (has the ocean on top) and they are both heavy and dense.
Example
: Mid-Atlantic Ridge - South American plate moves away from African plate and the North American plate moves away from the Eurasian Plate.
How it happens
: two oceanic plates move apart, the new land is created in the gap between the new plate, magma rises in the gap to create a shield volcano.
Move away from each other
