Cerro Chascon-Runtu Jarita complex
Coordinates: 21°53′02″S 67°54′18″W / 21.88389°S 67.90500°W Cerro Chascon-Runtu Jarita is a complex of lava domes located inside, but probably unrelated to, the Pastos Grandes caldera. It is part of the more recent phase of activity of the Altiplano-Puna volcanic complex.
Accompanied with little explosive activity on the main dome Cerro Chascon, it contains ten lava domes arranged in a chain. Located in the floor of the Pastos Grandes caldera, these domes were erupted after injection of mafic magmas in the deep less than 100,000 years ago. The largest dome has a volume of 5 cubic kilometres (1.2 cu mi).
The complex is a chain of seven lava domes named Runtu Jarita whose largest member is named Cerro Chascon. This chain is comparable with the Mono-Inyo craters in the United States. Together with other lava domes like Cerro Chao this complex is part of the young surface expression of the APVC and may indicate the future location of a caldera.
The lava domes are contained within the moat and floor of the Pastos Grandes caldera, but it may not be part of that caldera complex proper. The lava dome complex is part of the Altiplano-Puna volcanic complex, an igneous province located in the Central Andes. During the Late Miocene-, large ignimbrite eruptions took place covering an area of 70,000 square kilometres (27,000 sq mi) triggered by the formation of melts deep in the crust and their subsequent rise to the upper crust.
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