Lake Raeside - Hypervelocity Impact Crater

Alternate Names
Local Language
Coordinates 29° 26' 42" S; 121° 58' 39" E
Notes
  1. 60 km WNW of Leonora at Lake Raeside, Yilgarn Craton, Western Australia (Glikson et al., 2016).
Country Australia
Region Western Australia
Date Confirmed 2016
Notes
  1. Confirmed based on the presence of well-developed PDFs in quartz and diaplectic plagioclase glass (Glikson et al., 2016).
Buried? Yes
Notes
  1. Buried below ~108 m of a thick paleo-drainage channel succession of lacustrine and alluvial deposits Upper Cretaceous to Eocene in age (Glikson et al., 2016).
Drilled? Yes
Notes
  1. One drill hole 95 m deep consisting entirely of breccia (Glikson et al., 2016).
Target Type Crystalline
Notes
  1. Archean granite-greenstone terrain of Yilgam Craton (Glikson et al., 2016).
Sub-Type Greenstone, Granite
Apparent Crater Diameter (km) 11 km
Age (Ma) 34 - 250
Notes :
  1. Breccia is poorly consolidated and matrix has not undergone regional metamorphism so a relatively young age is proposed, which likely postdates the Permian glaciation of Western Australia. Buried by lacustrine and fluvial deposits Upper Cretaceous to Eocene in age (Glikson et al., 2016).

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Erosion
4
  1. Only one drill hole to date but breccia in crater-fill is thick so erosion of structure may be low (Glikson et al., 2016).
Final Rim Diameter
Unknown
Apparent Rim Diameter
11 km
  1. Based on the diameter of magnetic anomaly, but could be larger based on the thickness (minimum of 95 m) of drilled breccia (Glikson et al., 2016).
Rim Reliability Index
3
  1. No information known.
Crater Morphology
Complex
Central Uplift Diameter
km
Central Uplift Height
Unknown
Uplift Reliability Index
Structural Uplift
Unknown
Thickness of Seds
Target Age
Precambrian
Marine
No
Impactor Type
Other Shock Metamorphism
No
Shatter Cones
No
  1. Buried impact structure.
Planar Fractures
No
Planar Deformation Features
Yes
  1. Single to multiple sets of PDF lamella in quartz (Glikson et al., 2016).
Diaplectic Glass
Yes
  1. Diaplectic quartz and plagioclase (Glikson et al., 2016).
Coesite
No
Stisovite
No
Crater Fill
M
  1. A glassy matrix is reported (Glikson et al., 2016)
Proximal Ejecta
Distal Ejecta
Dykes
Volume of Melt
Depth of Melting
Minimum thickness of 95 m (bottom of breccia has not been reached through drilling).

References

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A Glikson, A Hickman, R Crossley (2016) Evidence for a shock-metamorphic breccia within a buried impact crater, Lake Raeside, Yilgarn Craton, Western Australia, Australian Journal of Earth Sciences 63(1), p. 99-109, Blackwell Scientific Publications for the Geological Society of Australia, Melbourne, Victoria, url, doi:http://dx.doi.org/10.1080/08120099.2015.1131748