Report on Lonquimay (Chile) — March 1997
Bulletin of the Global Volcanism Network, vol. 22, no. 3 (March 1997)
Managing Editor: Richard Wunderman.
Lonquimay (Chile) 1988-89 lava flows continue emitting steam
Please cite this report as:
Global Volcanism Program, 1997. Report on Lonquimay (Chile). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 22:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199703-357100.
38.379°S, 71.586°W; summit elev. 2832 m
All times are local (unless otherwise noted)
A late-March overflight made after a prolonged dry season enabled observations with relatively low snow levels. The volcano lacked signs of fumarolic or other activity. However, during fieldwork S of La Holandesa crater, the 1988-89 lava flows to the NE of the main cone within the Las Paramelas valley continued to emit steam.
Geologic Background. Lonquimay is a small, flat-topped, symmetrical stratovolcano of late-Pleistocene to dominantly Holocene age immediately SE of Tolguaca volcano. A glacier fills its summit crater and flows down the S flank. It is dominantly andesitic, but basalt and dacite are also found. The prominent NE-SW Cordón Fissural Oriental fissure zone cuts across the entire volcano. A series of NE-flank vents and scoria cones were built along an E-W fissure, some of which have been the source of voluminous lava flows, including those during 1887-90 and 1988-90, that extended out to 10 km.
Information Contacts: Jose Antonio Naranjo, Servicio Nacional de Geología e Minería (SERNAGEOMIN), Av. Santa María 0104, Casilla 10465, Santiago, Chile; Hugo Moreno Roa, Observatorío Volcanogía de los Andes del Sur (OVDAS), Manantial 1710-Carmino del Alba, Temuco, Chile; Simon R. Young, British Geological Survey (BGS), Murchison House, West Mains Road, Edinburgh EH9 3LA, United Kingdom.