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Shock‐induced melting and vaporization of shatter cone surfaces: Evidence from the Sudbury impact structure

GIBSON, HEATHER M., SPRAY, JOHN G.·1998·Meteoritics & Planetary Science
DOI 10.1111/j.1945-5100.1998.tb01637.x
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Abstract

Abstract— Analytical scanning electron microscopy has been used to investigate the surface textures and compositions of newly exposed shatter cones from the 1.85 Ga Sudbury impact structure, Canada. Unusual surface microstructures are observed at the micron scale, including silicate melt smears, melt fibres and melt splats. Silicate and Ni‐rich spherules up to 5 μm in diameter adorn earlier‐formed surface features, and we interpret these to be condensates formed due to shock‐induced vaporization of the shatter cone surfaces. The development of striations on the shatter cones is attributed to shock‐related fracture and slip. Formation of melts and spherules indicates that the highest ranks of shock metamorphism (Stages IV and V) were realized, but only on a very localized scale. Shatter cone surfaces are, therefore, likely sites for the development of high‐pressure polymorphs and, if the chemistry is appropriate, fullerenes. As such, they may be equivalent to “Type A” pseudotachylytes and shock veins in meteorites.

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Metadata

Authors
GIBSON, H. M., & SPRAY, J. G.
Venue
Meteoritics & Planetary Science
Publisher
Wiley
Published
1998-03
Volume
33
Issue
2
Pages
329-336
ISSN
  • 1086-9379
  • 1945-5100
DOI
10.1111/j.1945-5100.1998.tb01637.x
Cited by
34
References
0
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 4358 d)

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