A permitted intrusion is an igneous intrusion where the space that it occupies has been created by forces other than those created by the intrusion of magma. For example if a volcano collapses after eruption in a cauldron subsidence event to make a caldera, any magma intruded along the faults that occur will follw those faults and result in a permitted intrusion. An example of this type of intrusion is a ring dyke.
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