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Tectonic Plates
1.
2. Where did we use the term tectonic plates in the
previous lecture?
What is the age of the earth?
3. What is tectonic plates?
What are the different tectonic plates?
What is the history of tectonic plates?
Do the tectonic plates move?
Briefly explain the movement of plates?
What is continental drift?
What is the evidence of continental drift?
5. CANZA, (Clue : The 4th theatre in Coimbatore is still
kicking, Akka)
AABRAIN (Clue : Dubaia, Bahraina, Sharjahava?)
RICARBEAN (Clue : West Indies)
6.
7. The lithosphere is divided into several slabs or
blocks or plates. These plates are supported from
below by Asthenosphere. These plates are called
Lithosphere plates or Tectonic Plates.
Some of these plates encompass continents, some
of these plates encompass oceans and some of the
plates encompass both oceans and continents.
8.
9. The plates are divided into three categories
Primary Plates
Secondary Plates
Tertiary Plates
The primary plates and secondary plates are together
called major plates.
The tertiary plates are sub divisions of Primary and
Secondary Plates
10. Primary
African Plate
Antarctic Plate
Eurasian Plate
Indo-Australian Plate (sometimes Indian and Australian)
North American Plate
Pacific Plate
South American Plate
Secondary
Arabian Plate
Caribbean Plate
Cocos Plate
Juan de Fuca Plate
Nazca Plate
Philippine Sea Plate
Scotia Plate
11.
12.
13.
14. 225 million years ago (Permian)
PANGAEA
200 million years ago (Triassic)
LAURASIA, GONDWANA
125 million years ago (Jurassic)
NENA,COLUMBIA,ZEALANDIA
65 million years ago (Cretaceous)
LEMURIA
CURRENT
150 million years later
AMASIA
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21.
22. The movement of tectonic plates is believed to be induced
by the asthenosphere which induces heat and convection
currents.
The plates are capable of drifting with respect to each other
along their plate boundaries.
Based on the plate movement, there are 3 principal type of
boundaries namely
Diverging Boundaries
Converging Boundaries
Transform Boundaries
27. EXAMPLES
Divergent Boundaries
North American Plate & Eurasian Plate
Convergent Boundaries
South American Plate & Nazca Plate
Transform Boundaries
North American Plate & Pacific Plate near the JDF Plate
28.
29. PLEASE NOTE
When two continental plates diverge, a rift is created.
Eg. East African Rift
When two oceanic plates diverge, a ridge is created. Sea
Floor Spreading is said to occur.
Eg. Mid Atlantic Ridge
When two oceanic plates converge, an island arc and
trench are created.
When an oceanic and convergent plate converge, a volcano
and trench are created.
When two continental plates converge, a mountain range is
formed.
30. PLEASE NOTE
When two continental plates or oceanic plates or
continental/oceanic plates transform, ______
PLATE MARGIN, ANY GUESSES?
