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Lecture

Plate Tectonics History.docx

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Department
Geology
Course
GEOL 2207
Professor
B.Ward
Semester
Summer

Description
Plate Tectonics History Brought together by J. Tuzo Wilson Plate tectonics, Plate tectonic cycle – evolution of continental drift, sea rifts Seafloor Dynamics  ~200 Ma from floor birth (MOR) to death (Subduction)  Oldest: 175 Ma in W Pacific and W&E Atlantic Continental Dynamics  Buoyant, do not subduct  Oldest in North America: 4 ~Ga, repeated in fragmentation and reaggregation Relative Plate Motion: Boundaries: Divergent – Where oceanic crust/floor forms  upwelling of magma Convergent – Where boundaries come together – ocean-continent, o-o, c-c. Transform – Two plates sliding side by side Divergent Plate Boundaries  New crust created  Upwelling in asthenosphere,
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