• Login
    View Item 
    •   Home
    • Research Publications
    • Research Centres & Groups
    • Environmental Sustainability Research Centre
    • View Item
    •   Home
    • Research Publications
    • Research Centres & Groups
    • Environmental Sustainability Research Centre
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UDORACommunitiesTitleAuthorsIssue DateSubmit DateSubjectsThis CollectionTitleAuthorsIssue DateSubmit DateSubjects

    My Account

    LoginRegister

    About and further information

    AboutOpen Access WebpagesOpen Access PolicyTake Down Policy University Privacy NoticeUniversity NewsTools for ResearchersLibraryUDo

    Statistics

    Display statistics

    Lower crustal heterogeneity and fractional crystallisation control evolution of small volume magma batches at ocean island volcanoes (Ascension Island, South Atlantic)

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    OpenAccess_Chamberlain_et_al._ ...
    Size:
    5.955Mb
    Format:
    PDF
    Download
    Authors
    Chamberlain, Katy J.
    Barclay, Jenni
    Preece, Katie
    Brown, Richard J.
    Davidson, Jon P.
    Affiliation
    Durham University
    University of Derby
    University of East Anglia
    Swansea University
    Issue Date
    2019-08-10
    
    Metadata
    Show full item record
    Abstract
    Ocean island volcanoes erupt a wide range of magmatic compositions via a diverse range of eruptive styles. Understanding where and how these melts evolve is thus an essential component in the anticipation of future volcanic activity. Here we examine the role of crustal structure and magmatic flux in controlling the location, evolution and ultimately composition of melts at Ascension Island. Ascension Island, in the south Atlantic, is an ocean island volcano which has produced a continuum of eruptive compositions from basalt to rhyolite in its 1-million-year subaerial eruptive history. Volcanic rocks broadly follow a silica undersaturated subalkaline evolutionary trend and new data presented here show a continuous compositional trend from basalt through trachyte to rhyolite. Detailed petrographic observations are combined with in-situ geochemical analyses of crystals and glass, and new whole rock major and trace element data from mafic and felsic pyroclastic and effusive deposits that span the entire range in eruptive ages and compositions found on Ascension Island. These data show that extensive fractional crystallisation is the main driver for the production of felsic melt for Ascension Island; a volcano built on thin, young, oceanic crust. Strong spatial variations in the compositions of erupted magmas reveals the role of a heterogeneous lower crust: differing degrees of interaction with a zone of plutonic rocks are responsible for the range in mafic lava composition, and for the formation of the central and eastern felsic complexes. A central core of nested small-scale plutonic, or mush-like, bodies inhibits the ascent of mafic magmas, allowing sequential fractional crystallisation within the lower crust, and generating felsic magmas in the core of the island. There is no evidence for magma mixing preserved in any of the studied eruptions, suggesting that magma storage regions are transient, and material is not recycled between eruptions.
    Citation
    Chamberlain, K.J., Barclay, J., Preece, K.J., Brown, R.J. and Davidson, J.P., (2019). 'Lower Crustal Heterogeneity and Fractional Crystallisation Control Evolution of Small Volume Magma Batches at Ocean Island Volcanoes (Ascension Island, South Atlantic)'. Journal of Petrology, pp. 1-84. DOI: 10.1093/petrology/egz037
    Publisher
    Oxford University Press
    Journal
    Journal of Petrology
    URI
    http://hdl.handle.net/10545/624169
    DOI
    10.1093/petrology/egz037
    Additional Links
    https://academic.oup.com/petrology/advance-article/doi/10.1093/petrology/egz037/5545960
    Type
    Article
    Language
    en
    ISSN
    00223530
    EISSN
    14602415
    ae974a485f413a2113503eed53cd6c53
    10.1093/petrology/egz037
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

    entitlement

     
    DSpace software (copyright © 2002 - 2021)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.