澳亞撞擊事件定年分析
Date Issued
2004
Date
2004
Author(s)
DOI
922116M002007
Abstract
Darwin Glass represents the impart-related siliceous glass that formed in Tasmania, close to
the Australasian Strewn Field. Three samples of such glass were dated using 40 Ar/39 Ar
single-grain laser fusion technique, yielding isochron ages of 796-815 ka with an overall
weighted mean of 816 ± 8 ka. These age data are statistically indistinguishable from those
recently reported for the Australasian tektites from Southeast Asia and Australia (761-816 ka).
However, considering the compositional and textural differences and the disparity from the
presumed impact crater area for Australasian tektites, the Darwin glass is more likely to have
resulted from an individual impact event. We therefore infer that multiple impacts, owing
probably to a cometary explosion in the atmosphere, may have occurred in SE Asia and
Australia during the mid-Pleistocene.
Subjects
Darwin Glass
Australasian tektites
Impact event
40 Ar/39 Ar dating
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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