Granite Tor

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  • They are not bedding planes because granite, as you mentioned is an igneous rather than a sedimentary rock. The horizontal joints are caused by denudation of the original rock releasing surface pressure causing the granite to fracture horizontally.
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Granite Tor

  1. 1. The Formation of a Granite Tor
  2. 2. Granite Tors start to form when magma that has intruded into the crust cools to form a batholith. The softer rock above the batholith erodes away over time leaving the batholith exposed to the elements. While the rock is cooling it starts to contract causing cracks- these also occur when the batholith is exposed and pressure is released. The cracks in the Granite rock are made worse by the process of freeze-thaw weathering, this is the process where water gets into the cracks in the rocks and freezes when the temperature drops, expanding by 9%, this repeated process causes the cracks in the rock to widen. This process affects the Tor more where the joints are closer together.
  3. 3. As this freeze-thaw weathering continues bits of Rock start to break off, the name for these pieces of rock is scree. <ul><li>This type of weathering leaves the Tor with certain characteristics: </li></ul><ul><li>The joints also become visible in the Tor, </li></ul><ul><li>The Tors edges are smooth and round. </li></ul>Horizontal Bedding Planes Smooth Round Edges Vertical Joints
  4. 4. Case study: Dartmoor Dartmoor has many Tors and is a popular popular place with tourists. Most of the Dartmoor Tors are located in the Dartmoor national park, this makes it an ideal place to visit for tourists.
  5. 5. Bowermans nose: Here are a few of the Dartmoor Tors: Black Tor Hay Tor Hound Tor
  6. 6. Thank You For Watching Created By S.Hayes

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