1 Geotectonic Concepts
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Modul 1GEO TECTONIC
CONCEPTS
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PLATE TECTONICS
Continental drift
The theory that the continents have moved in
relation to one another
Plate tectonics
The theory of global dynamics in which the
lithosphere is believed to be broken into
individual plates that move in response to
convection in the (upper) mantle. The margins of
the plates are sites of considerable geologic
activity.
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GEO-TECTONIC HYPOTHESIS PRIOR TO PLATE TECTONICS THEORY
(Van Der Pluijm & Marshak, 2004)
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Plate Tectonic Theory
• Lithosphere is broken into individual pieces called plates
• Plates move over the asthenosphere
– as a result of underlying convection cells
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Antonio Snider-Pelligrini’ Map (1858)
Continental Drift
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(from Tomecek, 2009)
EARLY CONTINENTAL DRIFT
CONCEPT
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(from : Frisch et al 2011)
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(from Tomecek, 2009)
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(from Tomecek, 2009)
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(from Tomecek, 2009)
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Alfred Wegener’ Map (1915)
Continental Drift
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Wegener’s Concept of Continental Drift and Orogenesis
Note:
Most geologists and geophysicists rejected Wegener’s ideas
because they violated what was known about the STRENGTH
OF ROCKS.
Also, centrifugal force (from Earth’s rotation) along with tidal
forces were deemed to be TOO SMALL to move the continents!
Continental Drift
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Continents Fit
Together
Evidence on Continent
Best fit at 100 m below sea level
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Evidence on Continent
Rocks and
Structures Match Up
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Evidence on Continent
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Appalachians
AppalachiansCaledonides
Mauritanides
Mountain Belts of
the Same Age
Evidence on Continent
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Evidence on Continent
Glacial Features
Direction of ice flow
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Evidence on Continent
Fossils
Lystrosaurus
Glossopteris
Cynognathus
Mesosaurus
Permian-Pennsylvanian
Early Triassic
Permian
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Evidence on Continent
Paleoclimate
of Pangea
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Evidence on Seafloor
Seafloor
Morphology
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Evidence on Seafloor
Paleomagnetism and
seafloor spreading
Magnetic Time Scale Magnetic Stripe Formation at Ridge Crest
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Evidence on Seafloor
Paleomagnetism and
seafloor spreading
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Evidence on Seafloor
Seafloor Age Map
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Reconstruction
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PLATES OF THE EARTH
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Results in the formation of Oceanic Crust
Plate Tectonics
Divergent Boundary
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Transform Boundary
Plate Tectonics
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Results in the formation & growth of Continental Crust
and destruction of Oceanic Crust
Melting
Produce
s More
Felsic
Magma
Plate Tectonics
Convergent Boundary: Subduction
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Results in the growth of Continental Crust
Convergent Boundary: Collision
Plate Tectonics
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WILSON CYCLE
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BASIC PLATE TECTONICS – Revised
• Earth’s lithosphere is broken into 12-24 rigid
plates
• Plates move about 1-10 cm/yr on the plastic
Asthenosphere
• “Geology happens” where the plates
interact with one another along Divergent,
Transform, Subduction and Collisional
Boundaries