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In data from the New Horizons encounter with Pluto in 2015, attention wascalled to a crater named Kiladze and its surroundings because of the water icespectral properties, which contrast with the primarily methane ice regionalsurface composition. The water ice carries the spectral signature of anammoniated compound, similar to that seen at two other sites on Pluto wherecryovolcanism has been identified. The faulted structure of Kiladze, includingshaping by numerous collapse pits and the distorted shape of the crater, arecompatible with the surroundings in Hayabusa Terra, east of Spunik Planitia.They are further compatible with an interpretation as a resurgent calderaformed during a past era of active cryovolcanic period that appears to besignificantly more recent than the overall age of the planet's surface,possibly in the last several million years. In view of the size of the calderaand the large scale of the surrounding distribution of water ice, we proposethat Kiladze is a "supervolcano" in which one or more explosive events hasscattered more than ~1000 km$^{3}$ of icy cryomagma erupted from the interioronto the surface.

Kiladze Caldera: A possible "supervolcano" on Pluto*