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    Carbonatite ring-complexes explained by caldera-style volcanism

    Access Status
    Open access via publisher
    Authors
    Andersson, M.
    Malehmir, A.
    Troll, V.
    Dehghannejad, M.
    Juhlin, Christopher
    Ask, M.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Andersson, M. and Malehmir, A. and Troll, V. and Dehghannejad, M. and Juhlin, C. and Ask, M. 2013. Carbonatite ring-complexes explained by caldera-style volcanism. Scientific Reports. 3 (Article 1677): pp. 1-9.
    Source Title
    Scientific Reports
    DOI
    10.1038/srep01677
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/12621
    Collection
    • Curtin Research Publications
    Abstract

    Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite ring-complexes is usually poorly constrained. Here, we show that carbonatite ring-complexes can be explained by caldera-style volcanism. Our geophysical investigation of the Alnö carbonatite ring-complex in central Sweden identifies a solidified saucer-shaped magma chamber at ~3 km depth that links to surface exposures through a ring fault system. Caldera subsidence during final stages of activity caused carbonatite eruptions north of the main complex, providing the crucial element to connect plutonic and eruptive features of carbonatite magmatism. The way carbonatite magmas are stored, transported and erupt at the surface is thus comparable to known emplacement styles from silicic calderas.

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