plate tectonics drives 2 stages of crust-making 1. mantle partially melts to make ocean crust
DESCRIPTION
Plate Tectonic Theory – The Earth’s outer shell (lithosphere) is composed of rigid plates that are moving relative to one another. Plate Tectonics drives 2 Stages of Crust-making 1. Mantle partially melts to make ocean crust 2. Ocean crust melts to make continental crust. - PowerPoint PPT PresentationTRANSCRIPT
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Plate Tectonic Theory – The Earth’s outer shell (lithosphere) is
composed of rigid plates that are moving relative to one another.
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Plate Tectonics drives 2 Stages of Crust-making1. Mantle partially melts to make ocean crust2. Ocean crust melts to make continental crust
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What moves the Plates?
Slab Pull Mantle Push Ridge Slide
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Types of Plate Boundaries
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Divergent Plate BoundariesMid-ocean Ridges
Where Stage 1 Crust is Made
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Youthful Oceanic Crust
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Basalt – Rock Typeof the OceanicCrust
Remember:Melting the mantle makesmafic magma!! Always
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Continental Rifting The creationof new ocean basins
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The Break-up of Pangea
200 Ma
125 Ma 75 Ma
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Convergent Boundaries Making 2nd Stage Crust
Ancient Continental Crust
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Convergent Boundaries- Where the Action Is!!
Ocean-Continent
Continent - Continent
Ocean - Ocean
Earthquakes
Volcanoes
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Mt. St. HelensMay 18, 1980
Consequences of ConvergenceExplosive Volcanism
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Consequences of ConvergenceMountain Building and Rock Deformation
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Consequences of ConvergenceEarthquakes
Banda Ache, Dec. 26, 2004
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OROGENESISThe Culmination of Convergence
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San Francisco EarthquakeApril 18, 1906 Mag 7.8Transform
Boundaries
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Mantle
Hotspots
Creation of overthickened oceanic crust
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Famous Hotspots
Hawaii
Yellowstone?
Iceland