Huambo volcanic field
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. 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. The formation of these fields may have been influenced by magma ascent along deep fault systems.
Trachyandesite is the major eruption product of Huambo. The magmas forming this field formed in deep magma chambers with little modification in shallower magma chambers. Basement lava flows have been dated at 1.05±0.04 mya. The Huambo field is located within the Arequipa crustal domain.
- "Huambo". Global Volcanism Program. Smithsonian Institution.
- Delacour, Adélie; Gerbe, Marie-Christine; Thouret, Jean-Claude; Wörner, Gerhard; Paquereau-Lebti, Perrine (17 November 2006). "Magma evolution of Quaternary minor volcanic centres in southern Peru, Central Andes" (PDF). Bulletin of Volcanology. 69 (6): 581–608. doi:10.1007/s00445-006-0096-z.
- Andean Volcanism: Nevado Hualca Hualca Volcano, Southern Peru, and El Reventador Volcano, Ecuador. ProQuest. 2008. pp. 34–35. ISBN 978-0-549-36997-4.
- Mamani, M.; Worner, G.; Sempere, T. (25 September 2009). "Geochemical variations in igneous rocks of the Central Andean orocline (13 S to 18 S): Tracing crustal thickening and magma generation through time and space". Geological Society of America Bulletin. 122 (1–2): 162–182. doi:10.1130/B26538.1.
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