Mafic magma recharge supplies high CO2 and SO2 gas fluxes from Popocatépetl volcano, Mexico

Abstract

Research Article| February 01, 2009 Mafic magma recharge supplies high CO2 and SO2 gas fluxes from Popocatépetl volcano, Mexico Julie Roberge; Julie Roberge 1Departamento de Geoquímica, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán D.F. 04510, Mexico Search for other works by this author on: GSW Google Scholar Hugo Delgado-Granados; Hugo Delgado-Granados 2Departamento de Volcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán D.F. 04510, Mexico Search for other works by this author on: GSW Google Scholar Paul J. Wallace Paul J. Wallace 3Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Julie Roberge 1Departamento de Geoquímica, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán D.F. 04510, Mexico Hugo Delgado-Granados 2Departamento de Volcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán D.F. 04510, Mexico Paul J. Wallace 3Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA Publisher: Geological Society of America Received: 16 Jun 2008 Revision Received: 24 Sep 2008 Accepted: 26 Sep 2008 First Online: 12 Oct 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (2): 107–110. https://doi.org/10.1130/G25242A.1 Article history Received: 16 Jun 2008 Revision Received: 24 Sep 2008 Accepted: 26 Sep 2008 First Online: 12 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Julie Roberge, Hugo Delgado-Granados, Paul J. Wallace; Mafic magma recharge supplies high CO2 and SO2 gas fluxes from Popocatépetl volcano, Mexico. Geology 2009;; 37 (2): 107–110. doi: https://doi.org/10.1130/G25242A.1 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 Since late 1994, open-vent eruptive activity and degassing at Popocatépetl volcano, Mexico, have released large masses of CO2 and SO2. Tephra and lava produced by these eruptions show evidence for mixing of mafic and silicic magmas shortly before eruption. We present the first measurements of dissolved CO2 in the mafic magma end member based on analyses of olivine-hosted melt inclusions that were trapped at pressures as high as ~400 MPa (~15 km depth) beneath the volcano. We combine our data with thermodynamic models to show that degassing of mafic magma at ~150–350 MPa pressure can explain the CO2/SO2 mass ratios (1–8) of volcanic gases released from the volcano during 1995–1997. Our results demonstrate that mafic magma recharge was responsible for the high measured fluxes of CO2 and SO2 from 1995 to 1997. The total SO2 emission of 9 Mt during this period requires intrusion and degassing of a minimum of 0.8 km3 of mafic magma. Only ~0.3% of this new mafic magma has been erupted in the form of mixed (hybrid) lava and tephra. Our results suggest that the ongoing eruption of Popocatépetl is essentially an intrusive event. More generally, we suggest that intrusion and deep degassing may explain the high gas fluxes at some other open-vent volcanoes rather than convection of magma in the uppermost parts of subvolcanic conduits. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.