Rocks in the shear zone are strongly deformed, but no new lithosphere is created and none is consumed. Transform plate boundaries are zones of shearing, where two plates slide horizontally past each other. Metamorphism in transform fault zones creates rocks with strongly sheared fabrics, as well as hydrated crustal and even mantle rocks.Ĥ Characteristics of Transform Plate Boundaries Volcanism is rare along transform plate boundaries, but small amounts of basalt erupt locally from leaky transform faults. Shallow earthquakes are common along transform plate boundaries they are especially destructive on the continents. The structure and topography of oceanic fracture zones depend largely on the age difference across the fracture zone.ģ Major Concepts Continental transform fault zones are similar to oceanic transforms, but they lack fracture zone extensions. They may be several kilometers wide and thousands of kilometers long. Oceanic fracture zones trend perpendicular to the oceanic ridge. Compression and extension develop in only small areas. Parallel ridges and valleys, pull-apart basins, and belts of folds form. The three major types of transform boundaries are: (a) ridge-ridge transforms, (b) ridge-trench transforms, and (c) trench-trench transforms. Lithosphere is neither created nor destroyed. Chapter 20 Dynamic Earth Eric H ChristiansenĢ Major Concepts At transform plate boundaries plates move horizontally past each other on strike-slip faults.
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