Magnetotelluric images of magma distribution beneath Volcán Uturuncu, Bolivia: Implications for magma dynamics

Abstract

Research Article| March 01, 2015 Magnetotelluric images of magma distribution beneath Volcán Uturuncu, Bolivia: Implications for magma dynamics Matthew J. Comeau; Matthew J. Comeau 1Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1, Canada Search for other works by this author on: GSW Google Scholar Martyn J. Unsworth; Martyn J. Unsworth * 1Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1, Canada *E-mail: unsworth@ualberta.ca Search for other works by this author on: GSW Google Scholar Faustino Ticona; Faustino Ticona 2Universidad Mayor de San Andrés, Casilla 10077 Correo Central, La Paz, Bolivia Search for other works by this author on: GSW Google Scholar Mayel Sunagua Mayel Sunagua 3Empresa Kawsaqi, Correo Central, La Paz, Bolivia Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew J. Comeau 1Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1, Canada Martyn J. Unsworth * 1Department of Physics, University of Alberta, Edmonton, Alberta T6E 2E1, Canada Faustino Ticona 2Universidad Mayor de San Andrés, Casilla 10077 Correo Central, La Paz, Bolivia Mayel Sunagua 3Empresa Kawsaqi, Correo Central, La Paz, Bolivia *E-mail: unsworth@ualberta.ca Publisher: Geological Society of America Received: 09 Sep 2014 Revision Received: 19 Dec 2014 Accepted: 09 Jan 2015 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (3): 243–246. https://doi.org/10.1130/G36258.1 Article history Received: 09 Sep 2014 Revision Received: 19 Dec 2014 Accepted: 09 Jan 2015 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Matthew J. Comeau, Martyn J. Unsworth, Faustino Ticona, Mayel Sunagua; Magnetotelluric images of magma distribution beneath Volcán Uturuncu, Bolivia: Implications for magma dynamics. Geology 2015;; 43 (3): 243–246. doi: https://doi.org/10.1130/G36258.1 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 The Altiplano-Puna volcanic complex in the central Andes records a history of major caldera-forming eruptions over the past 10 m.y. Geophysical and geodetic data indicate that magma is still present, and perhaps mobile, in the crust. Broadband magnetotelluric data were used to generate two-dimensional and three-dimensional electrical resistivity models of the Altiplano-Puna magma body (APMB) with a focus on the zone of inflation around Volcán Uturuncu in southern Bolivia. Low electrical resistivities (<3 Ωm) at a depth of ∼15 km below sea level are interpreted as being due to the presence of andesitic melts of the APMB and require a melt fraction >20%. The upper surface of the APMB is shallowest beneath Uturuncu and the geometry is consistent with geodynamic models that require the upward movement of a melt layer at this location. The shallower resistivity structure is characterized by discrete electrically conductive bodies, oriented east-west near sea level (depth of 5 km), which are interpreted as a combination of partial melt and fluids. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.