15°50′S72°08′W / 15.83°S 72.13°W /-15.83; -72.13[1]
Huambo volcanic field is avolcanic field inPeru.Andahua-Orcopampa lies north-northeast andSabancaya east of Huambo,[1] east of theRio Colca.[2] The town ofHuambo lies between the two fields.[3]
The northern part of the field was active 700 BCE ± 50 years, forming a large lava flow field and a cinder cone Cerro Keyocc. The southern part of the field contains other cinder cones and lava flows. Some may be of Holocene age.[1]Lava flows are a few 10 metres (33 ft) thick. Four among the volcanoes of the southern field are Marbas Grande, Marbas, Marbas Chico I and Marbas Chico II.[2] The formation of these fields may have been influenced by magma ascent along deepfault systems.[4]
Trachyandesite is the major eruption product of Huambo.[1] The magmas forming this field formed in deep magma chambers with little modification in shallower magma chambers.[2] Basement lava flows have been dated at 1.05±0.04mya.[3] The Huambo field is located within the Arequipa crustal domain.[4]
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