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Zircon evidence for a ~200 k.y. supereruption-related thermal flare-up in the Miocene southern Black Mountains, western Arizona, USA

  • Susanne M. McDowellEmail author
  • Calvin F. Miller
  • Roland Mundil
  • Charles A. Ferguson
  • Joseph L. Wooden
Original Paper

Abstract

The Silver Creek caldera (southern Black Mountains, western Arizona) is the source of the 18.8 Ma, >700 km3 Peach Spring Tuff (PST) supereruption, the largest eruption generated in the Colorado River Extensional Corridor (CREC) of the southwestern United States. Within and immediately surrounding the caldera is a sequence of volcanics and intrusions ranging in age from ~19 to 17 Ma. These units offer a record of magmatic processes prior to, during, and immediately following the PST eruption. To investigate the thermal evolution of the magmatic center that produced the PST, we applied a combination of Ti-in-zircon thermometry, zircon saturation thermometry, and high-precision U–Pb CA–TIMS zircon dating to representative pre- and post-supereruption volcanic and intrusive units from the caldera and its environs. Similar to intracaldera PST zircons, zircons from a pre-PST trachytic lava (19 Ma) and a post-PST caldera intrusion (18.8 Ma) yield exceptionally high-Ti concentrations (most >20 ppm, some up to nearly 60 ppm), corresponding to calculated temperatures that exceed 900 °C. In these units, Ti-in-zircon temperatures typically surpass zircon saturation temperatures (ZSTs), suggesting the entrainment of zircon that had grown in hotter environments within the magmatic system. Titanium concentrations in younger volcanic and intrusive units (~18.7–17.5 Ma) decline through time, corresponding to an average cooling rate of 10−3.5 °C/year. The ~200 k.y. thermal peak evident at Silver Creek caldera is spatially limited: elsewhere in the Miocene record of the northern CREC, Ti-in-zircon concentrations and ZSTs are much lower, suggesting that felsic magmas were generally substantially cooler.

Keywords

Caldera Peach Spring Tuff Zircon Zircon thermometry CA–TIMS Supereruption 

Supplementary material

410_2014_1031_MOESM1_ESM.doc (409 kb)
Supplementary material 1 (DOC 409 kb)
410_2014_1031_MOESM2_ESM.xls (535 kb)
Supplementary material 2 (XLS 535 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Susanne M. McDowell
    • 2
    Email author
  • Calvin F. Miller
    • 1
  • Roland Mundil
    • 3
  • Charles A. Ferguson
    • 4
  • Joseph L. Wooden
    • 5
  1. 1.Department of Earth and Environmental SciencesVanderbilt UniversityNashvilleUSA
  2. 2.Department of GeologyHanover CollegeHanoverUSA
  3. 3.Berkeley Geochronology CenterBerkeleyUSA
  4. 4.Arizona Geological SurveyTucsonUSA
  5. 5.Stanford UniversityPalo AltoUSA

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