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.

DOI: https://doi.org/10.1130/0091-7613(2001)029%3C0899

URL: http://www.gsajournals.org/gsaonline/?request=get-...

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.

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About

  • Item ORO ID
  • 4200
  • Item Type
  • Journal Item
  • 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 or School
  • Institute of Educational Technology (IET)
  • Depositing User
  • Simon Kelley

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