The relationship between fumarole gas composition and eruptive activity at Galeras Volcano, Colombia

Abstract

Research Article| June 01, 1996 The relationship between fumarole gas composition and eruptive activity at Galeras Volcano, Colombia Tobias P. Fischer; Tobias P. Fischer 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Greg B. Arehart; Greg B. Arehart 2Argonne National Laboratory, CMT-205, Argonne, Illinois 60439 Search for other works by this author on: GSW Google Scholar Neil C. Sturchio; Neil C. Sturchio 2Argonne National Laboratory, CMT-205, Argonne, Illinois 60439 Search for other works by this author on: GSW Google Scholar Stanley N. Williams Stanley N. Williams 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Search for other works by this author on: GSW Google Scholar Author and Article Information Tobias P. Fischer 1Department of Geology, Arizona State University, Tempe, Arizona 85287-1404 Greg B. Arehart 2Argonne National Laboratory, CMT-205, Argonne, Illinois 60439 Neil C. Sturchio 2Argonne National Laboratory, CMT-205, Argonne, Illinois 60439 Stanley N. Williams 1Department 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 (1996) 24 (6): 531–534. https://doi.org/10.1130/0091-7613(1996)024<0531:TRBFGC>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Tobias P. Fischer, Greg B. Arehart, Neil C. Sturchio, Stanley N. Williams; The relationship between fumarole gas composition and eruptive activity at Galeras Volcano, Colombia. Geology 1996;; 24 (6): 531–534. doi: https://doi.org/10.1130/0091-7613(1996)024<0531:TRBFGC>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 Forecasting volcanic eruptions is critical to the mitigation of hazards for the millions of people living dangerously close to active volcanoes. Volcanic gases collected over five years from Galeras Volcano, Colombia, and analyzed for chemical and isotopic composition show the effects of long-term degassing of the magma body and a gradual decline in sulfur content of the gases. In contrast, short-term (weeks), sharp variations are the precursors to explosive eruptions. Selective absorption of magmatic SO2 and HCl due to interaction with low-temperature geothermal waters allows the gas emissions to become dominated by CO2. Absorption appears to precede an eruption because magmatic volatiles are slowed or retained by a sealing carapace, reducing the total flux of volatiles and allowing the hydrothermal volatiles to dominate gas emissions. Temporal changes in gas compositions were correlated with eruptive activity and provide new evidence bearing on the mechanism of this type of "pneumatic" explosive eruptions. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.