The University of Arizona

Laser-fusion 40Ar/39Ar Ages of Darwin Impact Glass

Ching-Hua Lo, Kieren T. Howard, Sun-Lin Chung, Sebastien Meffre

Abstract


Three samples of Darwin Glass, an impact glass found in Tasmania, Australia at the edge of the Australasian tektite strewn field were dated using the 40Ar/39Ar single-grain laser fusion technique, yielding isochron ages of 796-815 ka with an overall weighted mean of 816 ± 7 ka. These data are statistically indistinguishable from those recently reported for the Australasian tektites from Southeast Asia and Australia (761-816 ka; with a mean weighted age of 803 ± 3 ka). However, considering the compositional and textural differences and the disparity from the presumed impact crater area for Australasian tektites, Darwin Glass is more likely to have resulted from a distinct impact during the same period of time.

Keywords


Darwin impact glass;Laser fusion argon;Tasmania;40Ar/39Ar ages;isochron ages;impact crater

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