42.02 S, 70.18 W
summit elevation 1359 m
Crater Basalt volcanic field is located in southern Argentina, 130 km SE of San Carlos de Bariloche. The volcano is located 400 km east of the Perú-Chile trench. The volcano is related to the Gastre Fault System.
The volcanic field covers an area of 700 sq km, and consists of nine cinder cones and spatter cones which produced blocky lava flows.
Cerro Fermín (1153 m) is a large cinder cone which produced six lava flows. It is
composed of spatter, cinder and blocks. At its base are two black, blocky lava flows.
Pinchuleu is (1005 m) extruded at least four flows.
Cerro Contreras (1004 m) is deeply eroded, only two volcanic conduits are well preserved.
Cerro Ventana is a partially eroded spatter cone, 1008 m high. Seven lava flows have erupted from this cone.
Cerro Volcán is a scoria cone, 1025 m high, with a 100 m wide, 30 m deep crater.
Loma Huacha is a pyroclastic cone (959 m) with a small parasitic cone on its northeast flank. The crater is 50 m wide and is breached to the north.
Cerro Negro is the highest cone (1159 m) at Crater Basalt Volcano. It produced at
least four blocky flows that flowed in channels to the west and the east and then to the north-east joining the flows of the Gastre trench, near provincial road 4.
Cerro Antitruz (1100 m) is a pyroclastic cone located to the west of the volcanic field, and shows different characteristics to the other cones.
No recent eruptions.