Pocho volcanic field
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31°50′S 65°20′W / 31.833°S 65.333°W[1]
Pocho volcanic field is a volcanic field in Argentina.[2] It is associated with a crustal lineament known as the Ojo de Agua Lineament.[3]
It is located in the Sierras de Cordoba mountain chain.[4] It formed during the late Miocene, when a progressive shallowing of the subducting Nazca Plate caused volcanic activity to retreat 500 kilometres (310 mi) from the main Andes into the land behind the mountain chain.[2] This did result in a typical shallow slab chemistry of the Pocho rocks.[4] Volcanic activity at Pocho is dated about 4.7 +- 0.3 million years ago[5] and took place over two cycles.[6] Seismic activity in the area may indicate the presence of a residual magma chamber however,[7] which would also explain anomalous crustal seismic velocities in the area.[8]
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