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Pleistocene glass in the Australian desert: The case for an impact origin

Haines, Peter W.; Jenkins, Richard J.F. and Kelley, Simon P. (2001). Pleistocene glass in the Australian desert: The case for an impact origin. Geology, 29(10) pp. 899–902.

URL: http://www.gsajournals.org/gsaonline/?request=get-...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1130/0091-7613(2001)029%3C0899
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Abstract

Irregular masses and flat slabs of vesicular, slaglike, and glassy melt (referred to herein as Edeowie glass) are locally abundant on a desert plain in central South Australia, where the material appears to be associated with an old land surface being exhumed by deflation and water erosion. The slabs of melt are associated with outcrops of baked sediment having very similar geochemistry, suggesting an origin by in situ surface fusion. Embedded clasts displaying shock metamorphism in quartz suggest that the thermal source may have been in some way associated with an impact event, although an obvious crater is lacking. If Edeowie glass is related to impact, a different thermal mechanism from that generally ascribed to the production of impact melt is required because of evidence for in situ generation of melt distal from any crater. Ar-40/Ar-39 laser probe dating of two samples has produced overlapping dates of 0.67 +/- 0.07 and 0.78 +/- 0.33 Ma.

Item Type: Journal Article
ISSN: 0091-7613
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record.
Keywords: Pleistocene; South Australia; glass; argon-argon; shock metamorphism; impact
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4200
Depositing User: Simon Kelley
Date Deposited: 04 Jul 2006
Last Modified: 02 Dec 2010 19:51
URI: http://oro.open.ac.uk/id/eprint/4200
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