San Jerónimo volcano
San Jerónimo is a volcano in Argentina.
It is a monogenetic volcano like Negro de Chorrillos. It formed on top of ignimbrites of Miocene age of the Aguas Calientes caldera about 780,000 ± 100,000 years ago and is formed by lava, lava bombs and scoria. The volcano erupted basaltic-trachyandesitic lava which propagated to distances of from the vent.
San Jerónimo is part of a long alignment of volcanoes along the Calama-Olacapato-El Toro fault. This string of volcanoes is diverse, including calderas and stratovolcanoes on the one hand and plutons and monogenetic volcanoes on the other hand. One volcano that is part of this structure is Aguas Calientes caldera, on whose border the San Jerónimo volcano is constructed.
