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• W2000558366 abstract "Research Article| February 01, 2013 Direct observations of degassing-induced crystallization in basalts L. Jane. Applegarth; L. Jane. Applegarth 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Search for other works by this author on: GSW Google Scholar Hugh Tuffen; Hugh Tuffen * 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK *E-mail: h.tuffen@lancaster.ac.uk. Search for other works by this author on: GSW Google Scholar Mike R. James; Mike R. James 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Search for other works by this author on: GSW Google Scholar Harry Pinkerton; Harry Pinkerton 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Search for other works by this author on: GSW Google Scholar Katharine V. Cashman Katharine V. Cashman 2Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA3School 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 Author and Article Information L. Jane. Applegarth 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Hugh Tuffen * 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Mike R. James 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Harry Pinkerton 1Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK Katharine V. Cashman 2Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403-1272, USA3School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, UK *E-mail: h.tuffen@lancaster.ac.uk. Publisher: Geological Society of America Received: 17 May 2012 Revision Received: 29 Aug 2012 Accepted: 05 Sep 2012 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2013) 41 (2): 243–246. https://doi.org/10.1130/G33641.1 Article history Received: 17 May 2012 Revision Received: 29 Aug 2012 Accepted: 05 Sep 2012 First Online: 09 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 L. Jane. Applegarth, Hugh Tuffen, Mike R. James, Harry Pinkerton, Katharine V. Cashman; Direct observations of degassing-induced crystallization in basalts. Geology 2013;; 41 (2): 243–246. doi: https://doi.org/10.1130/G33641.1 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 Magma degassing can trigger crystal growth by increasing the magma liquidus temperature. As crystallization greatly increases magma viscosity, this process can strongly influence eruptive dynamics. We use a microscope and heated stage to obtain the first direct observations of degassing-driven crystal growth in natural basaltic melts at magmatic temperatures. Samples from Mount Etna, Italy (0.39 wt% H2O), and Kilauea volcano, Hawaii (0.18 wt% H2O) were heated in air at 1 bar, and held isothermally for 0.5–17 h between 1190 °C and 1270 °C, before cooling to solidus temperatures. On heating, bubble growth at >900 °C indicated volatile exsolution. In the hydrous Etna sample, isothermal conditions produced numerous new plagioclase crystals that grew to ≤160 μm at maximum rates of 5.2–18 × 10−6 cm s−1. Growth rates and crystal morphologies (tabular to spherulitic) depended on dwell temperature. Growth slowed dramatically after 20 min as equilibrium was approached. In the H2O-poor Kilauea sample, few new crystals appeared; they grew at maximum rates of 1.7–6.5 × 10−6 cm s−1. On cooling, crystal nucleation and growth were strongly influenced by preexisting crystal textures, highlighting the importance of studying natural samples. Our results document rapid crystal growth triggered by melt devolatilization when the H2O content of the glass is sufficiently high. Resultant swift, substantial changes in magma texture are a key control on lava rheology at Etna and elsewhere. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2000558366 title "Direct observations of degassing-induced crystallization in basalts" @default.
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