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Mantle heterogeneity controls on small-volume basaltic volcanism

2015; Geological Society of America; Volume: 43; Issue: 6 Linguagem: Inglês

10.1130/g36590.1

1943-2682

Lucy McGee, Marc‐Alban Millet, Christoph Beier, Ian E.M. Smith, Jan M. Lindsay,

earthquake and tectonic studies

Research Article| June 01, 2015 Mantle heterogeneity controls on small-volume basaltic volcanism Lucy E. McGee; Lucy E. McGee 1Centro de Excelencia en Geotermia de los Andes (CEGA) and Department of Geology, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Marc-Alban Millet; Marc-Alban Millet 2Department of Earth Sciences, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Christoph Beier; Christoph Beier 3GeoZentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg, Schlossgarten 5, D-91054 Erlangen, Germany Search for other works by this author on: GSW Google Scholar Ian E.M. Smith; Ian E.M. Smith 4School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Jan M. Lindsay Jan M. Lindsay 4School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information Lucy E. McGee 1Centro de Excelencia en Geotermia de los Andes (CEGA) and Department of Geology, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Marc-Alban Millet 2Department of Earth Sciences, Durham University, Durham DH1 3LE, UK Christoph Beier 3GeoZentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg, Schlossgarten 5, D-91054 Erlangen, Germany Ian E.M. Smith 4School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Jan M. Lindsay 4School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand Publisher: Geological Society of America Received: 07 Jan 2015 Revision Received: 14 Apr 2015 Accepted: 15 Apr 2015 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (6): 551–554. https://doi.org/10.1130/G36590.1 Article history Received: 07 Jan 2015 Revision Received: 14 Apr 2015 Accepted: 15 Apr 2015 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 Lucy E. McGee, Marc-Alban Millet, Christoph Beier, Ian E.M. Smith, Jan M. Lindsay; Mantle heterogeneity controls on small-volume basaltic volcanism. Geology 2015;; 43 (6): 551–554. doi: https://doi.org/10.1130/G36590.1 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 Eruptions of basaltic material in small-scale volcanic fields located in intraplate settings display a very diverse range in physical and chemical characteristics. Despite its relevance to the understanding of volcanic hazards, the relationship between physical properties of eruptions (explosivity, volume, location) and chemical composition of erupted products has, to date, not been investigated. Here we present a relationship between mantle heterogeneity and extents of partial melting, and both erupted volumes and eruptive style from the Auckland Volcanic Field (New Zealand), and we suggest that this provides a general model for small-scale "monogenetic" magmatic systems globally. Small volcanic centers consistently take the form of nephelinitic tuff rings and scoria cones, whereas larger centers are produced from effusive eruptions of less alkalic magmas. Nephelinitic melts are generated by melting of a deep, carbonated source, whereas less alkalic melts are the products of melting of a shallower, noncarbonated source. U-Th-Ra isotope data from eruptions closely paired in space and time show that mixing between magmas is extremely limited as a consequence of different ascent mechanisms due to differential segregation of melts from varying sources (early, carbonated melts ascending by higher porosity channels, and later, uncarbonated melts by a more diffusive regime). This suggests that extraction of melt is nearly instantaneous in these environments. Our results stress the importance of melting and magma dynamics in determining the size and style of eruptions in small volcanic fields, and suggest that mantle controls should be an important consideration in volcanic hazard assessment. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.