Impact Melt Rock
An impact melt rock is a type of rock typically found in impact structures. It is an impactite consisting of a mixture of solid and melt fragments all derived from the target rock, floating in a glassy, microcrystalline, or recrystallized matrix. The solid fragments may contain shocked minerals. An impact melt rock results from the cooling of the melt pool that formed within a crater because of the high temperature and pressure generated during the impact. The largest craters such as Sudbury (Ontario, Canada), Chicxulub (Mexico), Popigai (Siberia), or Manicouagan (Québec, Canada) contain a very large volume of impact melt. In the case of Sudbury, it also hosts important ore deposits of nickel.