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Basaltic scoria textures from a zoned conduit as precursors to violent Strombolian activity

2010; Geological Society of America; Volume: 38; Issue: 5 Linguagem: Inglês

10.1130/g30720.1

1943-2682

Corrado Cimarelli, Federico Di Traglia, Jacopo Taddeucci,

Reservoir Engineering and Simulation Methods

Research Article| May 01, 2010 Basaltic scoria textures from a zoned conduit as precursors to violent Strombolian activity C. Cimarelli; C. Cimarelli 1Dipartimento Scienze Geologiche, Università Roma Tre, Largo S.L. Murialdo 1, 00146 Rome, Italy Search for other works by this author on: GSW Google Scholar F. Di Traglia; F. Di Traglia 2Dipartimento Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy Search for other works by this author on: GSW Google Scholar J. Taddeucci J. Taddeucci 3Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information C. Cimarelli 1Dipartimento Scienze Geologiche, Università Roma Tre, Largo S.L. Murialdo 1, 00146 Rome, Italy F. Di Traglia 2Dipartimento Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy J. Taddeucci 3Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy Publisher: Geological Society of America Received: 25 Sep 2009 Revision Received: 19 Nov 2009 Accepted: 25 Nov 2009 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (5): 439–442. https://doi.org/10.1130/G30720.1 Article history Received: 25 Sep 2009 Revision Received: 19 Nov 2009 Accepted: 25 Nov 2009 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation C. Cimarelli, F. Di Traglia, J. Taddeucci; Basaltic scoria textures from a zoned conduit as precursors to violent Strombolian activity. Geology 2010;; 38 (5): 439–442. doi: https://doi.org/10.1130/G30720.1 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 Pyroclast textures document volcanic conduit processes and may be key to hazard forecasting. Here we show that the relative abundances of mingled, variably crystallized domains in pyroclasts from scoria cone eruptions provide a record of magma ascent velocity and can be used to predict the onset of violent Strombolian activity. Scoria clasts from the Croscat complex scoria cone (Spain) ubiquitously show micrometer- to centimeter-sized, microlite-rich domains (MRD) intermingled with volumetrically dominant, microlite-poor domains (MPD). Glass and bulk composition show that MRDs formed by microlite crystallization of MPDs, the former residing longer in a relatively cooler, degassed zone lining the conduit walls, the latter traveling faster in the central, hotter streamline. MPD and MRD magmas intermingled along the interface between the two velocity zones. The proportion of MPD and MRD in different tephra layers reflects the extent of the fast- and slow-flowing zones, thus reflecting the ascent velocity profile of magma during the different phases. At Croscat, the MPD/MRD volume ratio increased rapidly during the early Strombolian activity, peaked around the Strombolian to violent Strombolian transition, and then decreased smoothly irrespective of shifts in eruptive style. We suggest that magma ascent velocity escalated during the Strombolian phase due to the buoyant push of the underlying, volatile-rich magma that was about to drive the following violent Strombolian activity. Monitoring the MPD/MRD ratio of tephra during ongoing scoria cone eruptions may reveal changes in magma flow conditions and could forecast the onset of hazardous violent Strombolian activity. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.