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Laser fusion argon‐40/argon‐39 ages of Darwin impact glass
Author(s) -
LO ChingHua,
HOWARD Kieren T.,
CHUNG SunLin,
Meffre Sebastien
Publication year - 2002
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2002.tb00810.x
Subject(s) - isochron , geology , impact crater , darwin (adl) , argon , geochronology , geochemistry , chemistry , astrobiology , biology , systems engineering , organic chemistry , engineering
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 40 Ar/ 39 Ar 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.