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Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Budd, David A.
dc.contributor.author Troll, Valentin R.
dc.contributor.author Deegan, Frances M.
dc.contributor.author Jolis, Ester M.
dc.contributor.author Smith, Victoria C.
dc.contributor.author Whitehouse, Martin J.
dc.contributor.author Harris, Chris
dc.contributor.author Freda, Carmela
dc.contributor.author Hilton, David R.
dc.contributor.author Halldorsson, Saemundur
dc.contributor.author Ilya N., Ilya N.
dc.date.accessioned 2017-06-02T13:45:59Z
dc.date.available 2017-06-02T13:45:59Z
dc.date.issued 2017-01-25
dc.identifier.citation Budd, D. A. et al. Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz. Sci. Rep. 7, 40624; doi: 10.1038/srep40624 (2017).
dc.identifier.issn 2045-2322
dc.identifier.uri https://hdl.handle.net/20.500.11815/289
dc.description.abstract Quartz is a common phase in high-silica igneous rocks and is resistant to post-eruptive alteration, thus offering a reliable record of magmatic processes in silicic magma systems. Here we employ the 75 ka Toba super-eruption as a case study to show that quartz can resolve late-stage temporal changes in magmatic δ18O values. Overall, Toba quartz crystals exhibit comparatively high δ18O values, up to 10.2‰, due to magma residence within, and assimilation of, local granite basement. However, some 40% of the analysed quartz crystals display a decrease in δ18O values in outermost growth zones compared to their cores, with values as low as 6.7‰ (maximum ∆core−rim = 1.8‰). These lower values are consistent with the limited zircon record available for Toba, and the crystallisation history of Toba quartz traces an influx of a low-δ18O component into the magma reservoir just prior to eruption. Here we argue that this late-stage low-δ18O component is derived from hydrothermally-altered roof material. Our study demonstrates that quartz isotope stratigraphy can resolve magmatic events that may remain undetected by whole-rock or zircon isotope studies, and that assimilation of altered roof material may represent a viable eruption trigger in large Toba-style magmatic systems.
dc.description.sponsorship We thank Dr. Ir. A. Djumarma Wirakusumah of the Geological Survey of Indonesia for granting permission to undertake fieldwork in Sumatra. M. Mahjum is thanked for logistical support in the field and S. Kearns, A. Berger, K. Linden, L. Ilyinsky and B. Dahren are thanked for analytical support. We gratefully acknowledge the Swedish Research Council (VR), the Royal Swedish Academy of Sciences (KVA), Scripps Institution of Oceanography, Istituto Nazionale di Geofisica e Vulcanologia (INGV), the National Research Foundation (NRF) of South Africa, the Centre for Natural Disaster Science (CNDS), and the Otterborgska research fund at Uppsala University for generous financial support. NordSIM is financed and operated under a joint Nordic contract. This is NordSIM publication #486.
dc.format.extent 40624
dc.language.iso en
dc.publisher Springer Nature
dc.relation.ispartofseries Scientific Reports;7
dc.rights info:eu-repo/semantics/openAccess
dc.subject Geochemistry
dc.subject Petrology
dc.subject Jarðefnafræði
dc.subject Bergfræði
dc.title Magma reservoir dynamics at Toba caldera, Indonesia, recorded by oxygen isotope zoning in quartz
dc.type info:eu-repo/semantics/article
dcterms.license This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
dc.description.version Peer Reviewed
dc.identifier.journal Scientific Reports
dc.identifier.doi 10.1038/srep40624
dc.relation.url https://www.nature.com/articles/srep40624
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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