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, Alaska ]] A dike or '''dyke''' in Digital Data Series]] Dikes often form as either radial or concentric swarms around plutonic intrusives or around Volcanic Neck s or feeder vents in Volcanic Cone s. These are known as " Ring Dike "s. Dikes can vary in texture and composition from Diabase or Basalt ic to Granitic or Rhyolitic . Pegmatite dikes are extremely coarsely crystalline granitic rocks often associated with late stage granite intrusions or Metamorphic segregations. Aplite dikes are fine grained or sugary textured intrusives of granitic composition. SEE ALSO
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