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Discussion

Contact metamorphism differs from regional metamorphism in being

  • A.local to an igneous intrusion
  • B.spread over many hundreds of square kilometres
  • C.caused by pressure without heat
  • D.confined to sedimentary rocks

Answer: A

The heat of a pluton bakes a narrow aureole around it, producing non-foliated rocks such as hornfels and marble. Regional metamorphism acts over orogenic belts with directed pressure and produces foliated rocks instead.

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