_5-PlateTectonics_9Sept08

_5-PlateTectonics_9Sept08 - Global Tectonics: Plates and...

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Unformatted text preview: Global Tectonics: Plates and Plumes What is the evidence for rigid plates? What The Earth’s lithospheric plates QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. What is the evidence that plates are rigid? What Plate tectonic theory: – Strong lithospheric plates move atop a weak Strong asthenosphere asthenosphere – Deformation occurs at or near the edges of Deformation plates plates – The plates themselves are relatively The undeformed undeformed Key Concept: rigid “lithosphere” = crust + third rock layer of mantle peridotites QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. What is the evidence that plates are rigid? What Plate tectonic theory: – Strong lithospheric plates move atop a weak Strong asthenosphere asthenosphere – Deformation occurs at or near the edges of Deformation plates plates – The plates themselves are relatively The undeformed undeformed What is the evidence for rigid plates? What The Earth’s lithospheric plates What is the evidence that plates are rigid? Sea ice provides a reasonable visualization of what occurs at plate boundaries as broken slabs either diverge (a), or buckle as they converge (b). What is the evidence that plates are rigid? What surface deformation reveals: What – Deformation occurs preferentially at plate Deformation boundaries due to motion along plate boundaries. boundaries – Earthquakes are located almost exclusively along Earthquakes these boundaries. these What is the evidence that plates are rigid? Earthquakes: 1960–2000 ...
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This note was uploaded on 02/17/2011 for the course MSCI 101 taught by Professor Douglas during the Fall '08 term at South Carolina.

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