Title: A model of degassing at Galeras Volcano, Colombia, 1988-1993
Abstract: Research Article| November 01, 1993 A model of degassing at Galeras Volcano, Colombia, 1988-1993 John Stix; John Stix 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar José Arles Zapata G.; José Arles Zapata G. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia Search for other works by this author on: GSW Google Scholar Marta Calvache V.; Marta Calvache V. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia3Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Gloria Patricia Cortés J.; Gloria Patricia Cortés J. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia Search for other works by this author on: GSW Google Scholar Tobias P. Fischer; Tobias P. Fischer 4Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Diego Gómez M.; Diego Gómez M. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar Lourdes Narvaez M.; Lourdes Narvaez M. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar Milton Ordoñez V.; Milton Ordoñez V. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar Adriana Ortega E.; Adriana Ortega E. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar Roberto Torres C.; Roberto Torres C. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Search for other works by this author on: GSW Google Scholar Stanley N. Williams Stanley N. Williams 4Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Author and Article Information John Stix 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada José Arles Zapata G. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia Marta Calvache V. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia3Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Gloria Patricia Cortés J. 2Observatorio Vulcanológico del Sur, Apartado Aéreo 1795, Pasto, Colombia Tobias P. Fischer 4Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Diego Gómez M. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Lourdes Narvaez M. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Milton Ordoñez V. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Adriana Ortega E. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Roberto Torres C. 1Départment de Gélogie, Université de Montréal, Montréal, Québec H3C 3J7, Canada Stanley N. Williams 4Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (11): 963–967. https://doi.org/10.1130/0091-7613(1993)021<0963:AMODAG>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation John Stix, José Arles Zapata G., Marta Calvache V., Gloria Patricia Cortés J., Tobias P. Fischer, Diego Gómez M., Lourdes Narvaez M., Milton Ordoñez V., Adriana Ortega E., Roberto Torres C., Stanley N. Williams; A model of degassing at Galeras Volcano, Colombia, 1988-1993. Geology 1993;; 21 (11): 963–967. doi: https://doi.org/10.1130/0091-7613(1993)021<0963:AMODAG>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Galeras volcano reactivated in early 1988, as evidenced by increased seismicity, gas emissions, and fumarole temperatures, and had a series of explosive eruptions in May 1989. During 1989-1990 the volcano was characterized by high SO2 flux, reaching 5000 t (metric tons)/day. This period of strong degassing was followed by upward movement of magma (July-September 1991) and the emplacement of a lava dome (October-November 1991). Since November 1991, long- period seismicity and SO2 flux have decreased, indicating that the conduit has partially sealed itself, probably by crystallization and solidification of the magma. On July 16, 1992, the dome was destroyed by an explosion, consistent with pressurization due to sealing and degassing in a nonporous medium. Continued pressurization beneath the volcano is indicated by eruptions on January 14, March 23, April 4, April 13, and June 7, 1993. Glass inclusion and matrix glass analyses support a hypothesis of significant magma degassing at depth in the magma chamber and in the conduit. This degassing has reduced the H2O, S, and Cl contents of the magma, but the F content appears to have increased due to crystallization of anhydrous mineral phases and to the low fluid-melt partition coefficient for F. Despite its degassed state, Galeras is currently a dangerous volcano because the sealing process forces gas-saturated magma to release volatile components into confined spaces, thereby causing pressurization and explosive eruptions. This content is PDF only. Please click on the PDF icon to access. 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Publication Year: 1993
Publication Date: 1993-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 72
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