Changes in magma storage conditions following caldera collapse at Okataina Volcanic Center, New Zealand

  • Allison Rubin
  • Kari M. Cooper
  • Marissa Leever
  • Josh Wimpenny
  • Chad Deering
  • Tyrone Rooney
  • Darren Gravley
  • Qing-zhu Yin
Original Paper


Large silicic volcanic centers produce both small rhyolitic eruptions and catastrophic caldera-forming eruptions. Although changes in trace element and isotopic compositions within eruptions following caldera collapse have been observed at rhyolitic volcanic centers such as Yellowstone and Long Valley, much still remains unknown about the ways in which magma reservoirs are affected by caldera collapse. We present 238U–230Th age, trace element, and Hf isotopic data from individual zircon crystals from four eruptions from the Okataina Volcanic Center, Taupo Volcanic Zone, New Zealand, in order to assess changes in trace element and isotopic composition of the reservoir following the 45-ka caldera-forming Rotoiti eruption. Our data indicate that (1) mixing of magmas derived from crustal melts and mantle melts takes place within the shallow reservoir; (2) while the basic processes of melt generation likely did not change significantly between pre- and post-caldera rhyolites, post-caldera zircons show increased trace element and isotopic heterogeneity that suggests a decrease in the degree of interconnectedness of the liquid within the reservoir following collapse; and (3) post-caldera eruptions from different vents indicate different storage times of the amalgamated melt prior to eruption. These data further suggest that the timescales needed to generate large volumes of eruptible melt may depend on the timescales needed to increase interconnectedness and achieve widespread homogenization throughout the reservoir.


Rhyolite Taupo Volcanic Zone Hf isotope Zircon 230Th–238



This work was partially supported by National Science Foundation awards EAR-0738749 and EAR-1144945 to Kari Cooper, as well as by Durrell research grants from UC Davis and a Geological Society of America graduate student research grant to AER. We would also like to thank Jorge Vazquez and Matt Coble for their assistance on the SHRIMP-RG at the USGS/Stanford University facility, as well as Justin Glessner for his assistance with multicollector ICP-MS analyses and Mark Stelten for his valuable insights and help with sample preparation.

Supplementary material

410_2015_1216_MOESM1_ESM.xls (402 kb)
Online Resource 1 238U–230Th age, trace element, and Hf IC data for zircons (XLS 401 kb)
410_2015_1216_MOESM2_ESM.xls (198 kb)
Online Resource 2 Standard deviations of zircon trace element data (XLS 197 kb)
410_2015_1216_MOESM3_ESM.xls (196 kb)
Online Resource 3 Detailed data for Hf isotopic analyses of zircon standards (Temora, 91500, and MUN zircons) (XLS 196 kb)
410_2015_1216_MOESM4_ESM.xls (202 kb)
Online Resource 4 Detailed data for Hf isotopic analyses of zircon unknowns (XLS 202 kb)
410_2015_1216_MOESM5_ESM.xls (168 kb)
Online Resource 5 Results of MSWD calculations for zircon standards and unknowns (XLS 167 kb)
410_2015_1216_MOESM6_ESM.xls (172 kb)
Online Resource 6 Whole-rock Hf isotopic data (XLS 171 kb)
410_2015_1216_MOESM7_ESM.pdf (855 kb)
Online Resource 7 Detailed description of Hf IC reduction and MSWD calculations; detailed description of Kolmogorov–Smirnov statistical test calculations (PDF 855 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Allison Rubin
    • 1
  • Kari M. Cooper
    • 1
  • Marissa Leever
    • 2
  • Josh Wimpenny
    • 2
  • Chad Deering
    • 3
  • Tyrone Rooney
    • 4
  • Darren Gravley
    • 5
  • Qing-zhu Yin
    • 1
  1. 1.Department of Earth and Planetary SciencesUniversity of California, DavisDavisUSA
  2. 2.Lawrence Livermore National LaboratoryLivermoreUSA
  3. 3.Department of Geological and Mining Engineering and SciencesMichigan Technological UniversityHoughtonUSA
  4. 4.Department of Geological SciencesMichigan State UniversityEast LansingUSA
  5. 5.Department of Geological SciencesUniversity of CanterburyChristchurchNew Zealand

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