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

Journal Article · · Contributions to Mineralogy and Petrology
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Michigan Technological Univ., Houghton, MI (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Canterbury, Christchurch (New Zealand)
+ Show Author Affiliations

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. Furthermore, 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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1335788
Report Number(s):
LLNL-JRNL-700958
Journal Information:
Contributions to Mineralogy and Petrology, Vol. 171, Issue 1; ISSN 0010-7999
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (6)

Eruptive history of the Late Quaternary Ciomadul (Csomád) volcano, East Carpathians, part I: timing of lava dome activity journal March 2019
Repeated Rhyolite Eruption From Heterogeneous Hot Zones Embedded Within a Cool, Shallow Magma Reservoir journal March 2019
Coexisting Discrete Bodies of Rhyolite and Punctuated Volcanism Characterize Yellowstone's Post‐Lava Creek Tuff Caldera Evolution journal August 2019
Time scales and temperatures of crystal storage in magma reservoirs: implications for magma reservoir dynamics journal January 2019
First U-Pb zircon ages for late Miocene Ashfall Konservat-Lagerstätte and Grove Lake ashes from eastern Great Plains, USA journal November 2018
Time Scales and Temperatures of Crystal Storage in Magma Reservoirs: Implications for Magma Reservoir Dynamics
  • Cooper, Kari M.; Schrecengost, Kevin L.; Schlieder, Tyler
  • GSA Annual Meeting in Indianapolis, Indiana, USA - 2018, Geological Society of America Abstracts with Programs https://doi.org/10.1130/abs/2018am-321497
conference January 2018

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Related Subjects

58 GEOSCIENCES
Rhyolite
Taupo volcanic zone
Hf isotope
zircon
230Th–238U