What lies beneath? Reconstructing the primitive magmas fueling voluminous silicic volcanism using olivine-hosted melt inclusions

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dc.contributor.author Barker, Simon J.
dc.contributor.author Rowe, Michael C.
dc.contributor.author Wilson, Colin J. N.
dc.contributor.author Gamble, John A.
dc.contributor.author Rooyakkers, Shane M.
dc.contributor.author Wysoczanski, Richard J.
dc.contributor.author Illsley-Kemp, Finnigan
dc.contributor.author Kenworthy, Charles C.
dc.date.accessioned 2020-03-02T16:08:16Z
dc.date.available 2020-03-02T16:08:16Z
dc.date.issued 2020-02-27
dc.identifier.citation Barker, S. J., Rowe, M. C., Wilson, C. J. N., Gamble, J. A., Rooyakkers, S. M., Wysoczanski, R. J., Illsley-Kemp, F. and Kenworthy, C. C. (2020) 'What lies beneath? Reconstructing the primitive magmas fueling voluminous silicic volcanism using olivine-hosted melt inclusions', Geology, 48, doi: 10.1130/G47422.1 en
dc.identifier.volume 48 en
dc.identifier.issn 0091-7613
dc.identifier.uri http://hdl.handle.net/10468/9718
dc.identifier.doi 10.1130/G47422.1 en
dc.description.abstract Understanding the origins of the mantle melts that drive voluminous silicic volcanism is challenging because primitive magmas are generally trapped at depth. The central Taupō Volcanic Zone (TVZ; New Zealand) hosts an extraordinarily productive region of rhyolitic caldera volcanism. Accompanying and interspersed with the rhyolitic products, there are traces of basalt to andesite preserved as enclaves or pyroclasts in caldera eruption products and occurring as small monogenetic eruptive centers between calderas. These mafic materials contain MgO-rich olivines (Fo79–86) that host melt inclusions capturing the most primitive basaltic melts fueling the central TVZ. Olivine-hosted melt inclusion compositions associated with the caldera volcanoes (intracaldera samples) contrast with those from the nearby, mafic intercaldera monogenetic centers. Intracaldera melt inclusions from the modern caldera volcanoes of Taupō and Okataina have lower abundances of incompatible elements, reflecting distinct mantle melts. There is a direct link showing that caldera-related silicic volcanism is fueled by basaltic magmas that have resulted from higher degrees of partial melting of a more depleted mantle source, along with distinct subduction signatures. The locations and vigor of Taupō and Okataina are fundamentally related to the degree of melting and flux of basalt from the mantle, and intercaldera mafic eruptive products are thus not representative of the feeder magmas for the caldera volcanoes. Inherited olivines and their melt inclusions provide a unique “window” into the mantle dynamics that drive the active TVZ silicic magmatic systems and may present a useful approach at other volcanoes that show evidence for mafic recharge. en
dc.description.sponsorship Marsden Fund of the Royal Society of New Zealand (grant VUW1627); New Zealand Ministry of Business, Innovation and Employment (ECLIPSE project (contract RTVU1704)) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Geological Society of America en
dc.relation.uri https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47422.1/582810/What-lies-beneath-Reconstructing-the-primitive
dc.rights © 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. en
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ en
dc.subject Volcanoes en
dc.subject Mafic recharge en
dc.subject Taupo Volcanic Zone en
dc.subject Okataina en
dc.title What lies beneath? Reconstructing the primitive magmas fueling voluminous silicic volcanism using olivine-hosted melt inclusions en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother John Gamble, Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland. +353-21-490-3000 Email: john.gamble@vuw.ac.nz en
dc.internal.availability Full text available en
dc.date.updated 2020-03-02T15:59:17Z
dc.description.version Published Version en
dc.internal.rssid 504726905
dc.contributor.funder Royal Society of New Zealand en
dc.contributor.funder Marsden Fund en
dc.contributor.funder Ministry of Business, Innovation and Employment en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Geology en
dc.internal.copyrightchecked Yes
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress john.gamble@vuw.ac.nz en
dc.internal.bibliocheck In press. Check vol / issue / page range. Amend citation as necessary. en
dc.identifier.eissn 1943-2682


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© 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. Except where otherwise noted, this item's license is described as © 2020 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license.
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