Cosmogenic 21Ne exposure dating of young basaltic lava flows from the Newer Volcanic Province, western Victoria, Australia

  • Gillen D
  • Honda M
  • Chivas A
 et al. 
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Abstract

Cosmogenic21Ne was utilised to determine exposure ages of young subaerial basaltic lava flows from the Newer Volcanic Province, western Victoria, Australia. The ages (36-53 ka) determined from co-existing cosmogenic21Ne and3He in olivines separated from basalts are consistent within analytical uncertainties with ages previously determined by cosmogenic36Cl exposure dating. This paper illustrates the potential of cosmogenic neon exposure ages in studying the eruption, surface morphology, and erosion history of young volcanic rocks, which are difficult to date using other conventional methods, such as K-Ar or40Ar/39Ar dating. The present study demonstrates that combined cosmogenic3He and21Ne dating, specifically measured cosmogenic3He/21Ne ratios, on the same samples, is powerful for evaluating the validity of calculated cosmogenic3He and21Ne surface exposure ages. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Cosmogenic21Ne &3He
  • Noble gases
  • Olivine
  • Surface exposure dating

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