Magma eruption rates constrained by 40Ar/39Ar chronology and GIS for the Ceboruco–San Pedro volcanic field, western Mexico

Abstract

Research Article| March 01, 2004 Magma eruption rates constrained by 40Ar/39Ar chronology and GIS for the Ceboruco–San Pedro volcanic field, western Mexico Holli M. Frey; Holli M. Frey 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Search for other works by this author on: GSW Google Scholar Rebecca A. Lange; Rebecca A. Lange 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Search for other works by this author on: GSW Google Scholar Chris M. Hall; Chris M. Hall 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Search for other works by this author on: GSW Google Scholar Hugo Delgado-Granados Hugo Delgado-Granados 2Instituto de Geofisica, Universidad Nacional Autónoma de México, Coyoacán, D.F. 04510, Mexico Search for other works by this author on: GSW Google Scholar Author and Article Information Holli M. Frey 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Rebecca A. Lange 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Chris M. Hall 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1063, USA Hugo Delgado-Granados 2Instituto de Geofisica, Universidad Nacional Autónoma de México, Coyoacán, D.F. 04510, Mexico Publisher: Geological Society of America Received: 22 Jan 2003 Revision Received: 11 Jul 2003 Accepted: 24 Jul 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2004) 116 (3-4): 259–276. https://doi.org/10.1130/B25321.1 Article history Received: 22 Jan 2003 Revision Received: 11 Jul 2003 Accepted: 24 Jul 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Holli M. Frey, Rebecca A. Lange, Chris M. Hall, Hugo Delgado-Granados; Magma eruption rates constrained by 40Ar/39Ar chronology and GIS for the Ceboruco–San Pedro volcanic field, western Mexico. GSA Bulletin 2004;; 116 (3-4): 259–276. doi: https://doi.org/10.1130/B25321.1 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 SocietyGSA Bulletin Search Advanced Search Abstract 40Ar/39Ar geochronology is coupled with quantitative volume determinations (utilizing field mapping, digital elevation models, orthophotos, and geographic information system [GIS] software) to constrain magma eruption rates at the Ceboruco–San Pedro volcanic field (1600 km2) in the western Trans-Mexican arc. Ages are reported for 40 volcanic units, including Volcán Ceboruco (an active, andesitic stratovolcano), peripheral domes, shields, cinder cones, and fissure-fed flows. After a hiatus of ∼3 m.y., volcanic activity recommenced to produce 80.5 ± 3.5 km3 of magma at a rate of 63 m3/km2 per year over the past 0.8 m.y. However, 75% of this volume erupted in the past 100 k.y., including the 51 ± 2.5 km3 of Volcán Ceboruco, equivalent to an eruption rate of ∼377 m3/km2 per year. There have been at least two stages of cone-building activity at Volcán Ceboruco. The main edifice is composed of ∼38 km3 of precaldera andesites, the youngest dated at 45 ± 8 ka. Their eruption was followed by a hiatus, interrupted by a Plinian eruption at 1 ka. The Plinian eruption and subsequent lava flows are andesite to dacite in composition and constitute ∼13 km3 of the total volume of Volcán Ceboruco. Overall, the relative proportions of lava types erupted in the past 0.8 m.y. are 18%–19% basaltic andesite, 56%–60% andesite, 18%–22% dacite, and 3% rhyolite. The peripheral lavas are each of small volume, geochemically diverse, and show little evidence of prior storage in an upper-crustal chamber. The eruptive sequence, proportions of lava types, phenocryst assemblages, textures, and geochemistry imply that the lavas do not reflect the differentiation of a single parental liquid in a long-lived magma chamber. The distinct geochemical signatures were present prior to magma emplacement in the upper crust, whereupon subsequent degassing and crystallization led to variable phenocryst abundances and assemblages. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.