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Geosciences LibreTexts

4: Plate Tectonics

  • Page ID
    3518
    • 4.0: Introduction to Plate Tectonics
      The surface of the Earth is divided into rigid blocks, called tectonic plates that are bounded by narrow regions of high deformation called plate boundaries. Tectonic plates are comprised of both crust (oceanic or continental) and mantle rock and owe their rigidity to the stiffness of mantle rock at low temperatures. Tectonic plates come in various shapes and sizes and are continuously changing shape.
    • 4.1: The Forces Driving Plate Motions
      The motion of tectonic plates is driven by one simple principle, convection. Convection is the idea that dense, cold things sink, and buoyant, warm things rise.
    • 4.2: Magnetic Anomalies on the Seafloor
      While there are multiple ways to determine the age of rocks, such as radiometric dating and fossil dating, for large-scale plate tectonic studies the most useful way of determining the age of plates is using magnetic stratigraphy.
    • 4.3: Plates Moving on a Plane
    • 4.4: Relative Velocity and Reference Frames
    • 4.5: Plate Motions on a Sphere
      Now that we understand plate motion on a plane, let's move to a sphere. In order to move to a sphere, we need to master five ideas/concepts: (1) Spherical Coordinates, (2) Euler Pole, (3) Angular Distance, (4) Relative motion from Euler Poles, and (5) Velocity and direction of motion at a point.
    • 4.6: Summary