Portal de Periódicos da CAPES

Formation of cristobalite nanofibers during explosive volcanic eruptions

2009; Geological Society of America; Volume: 37; Issue: 5 Linguagem: Inglês

10.1130/g25457a.1

1943-2682

Martín Reich, Alejandro Zúñiga, Á. Amigo, Gabriel Vargas, Diego Morata, Carlos Palacios, Miguel A. Parada, René Garreaud,

earthquake and tectonic studies

Research Article| May 01, 2009 Formation of cristobalite nanofibers during explosive volcanic eruptions Martin Reich; Martin Reich * 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile *E-mail: mreich@ing.uchile.cl. Search for other works by this author on: GSW Google Scholar Alejandro Zúñiga; Alejandro Zúñiga 22Departamento de Ingeniería Mecánica, Universidad de Chile, Avenida Beauchef 850, Torre Central, Santiago, Chile Search for other works by this author on: GSW Google Scholar Álvaro Amigo; Álvaro Amigo 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile 33Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK Search for other works by this author on: GSW Google Scholar Gabriel Vargas; Gabriel Vargas 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Diego Morata; Diego Morata 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Carlos Palacios; Carlos Palacios 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Miguel Ángel Parada; Miguel Ángel Parada 11Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar René D. Garreaud René D. Garreaud 44Departamento de Geofísica, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile Search for other works by this author on: GSW Google Scholar Geology (2009) 37 (5): 435–438. https://doi.org/10.1130/G25457A.1 Article history received: 19 Aug 2008 rev-recd: 16 Dec 2008 accepted: 04 Jan 2009 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 Martin Reich, Alejandro Zúñiga, Álvaro Amigo, Gabriel Vargas, Diego Morata, Carlos Palacios, Miguel Ángel Parada, René D. Garreaud; Formation of cristobalite nanofibers during explosive volcanic eruptions. Geology 2009;; 37 (5): 435–438. doi: https://doi.org/10.1130/G25457A.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 High-resolution transmission electron microscopy (HRTEM) observations of unaltered volcanic air-fall deposits from the ongoing lava dome explosive eruption at Chaitén Volcano, Chilean Patagonia, revealed the presence of highly crystalline silica nanofibers in the respirable fraction of the volcanic ash ( 240 °C), beta form of cristobalite, with average lengths of hundreds of nanometers and widths on the order of tens of nanometers. We propose that the beta-cristobalite nanofibers are formed during explosive eruptions by the reduction of amorphous silica by carbon monoxide to its reactive suboxide SiO, which is later oxidized to form one-dimensional crystalline silica nanostructures. Nucleation and growth of the nanofibers are enhanced by the high surface area of the micrometer- to nanometer-sized fragments of silica glass in the volcanic column. The formation of nanocrystalline cristobalite fibers during explosive lava dome eruptions poses new challenges for the assessment of the short- and long-term health hazards associated with the respirable nanofibrous components of volcanic ash. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.