Acraman - Impact Deposit

Alternate Names N/A
Coordinates 31° 1' 12" N; 135° 26' 60" E
Notes
  1. (Williams 1986)
Country Australia

Related Countries :
  1. Australia
Region South Austrailia - Gawler Craton
Date Confirmed 1980
Notes
  1. (Williams and Gostin 2001)
Age (Ma) 450-635
Notes :
  1. (Williams and Gostin 2001); (Baldwin et al 1991); 580 Ma (Glass and Simonson, 2012); 635-541 Ma (Schmieder et al., 2015)

Method :
  1. Stratigraphic age (∼635–541 Ma) set by the Ediacaran Bunyeroo ejecta layer (Schmieder et al., 2015)
Impactor Type chondrite
Notes
  1. (Gostin et al 1986)

Advanced Data Fields

Notes

Local Language
N/A
Spherules
Yes
Tektites
Unknown
Indivudual Glass Clasts
Unknown
Source Crater
Unknown
Geology
Acraman is a deeply eroded (>2.5 km) complex impact structure
  1. (Williams and Gostin 2001)
Other Shock Metamorphism
Unknown
Shatter Cones
Yes
Planar Fractures
No
Planar Deformation Features
Yes
  1. Williams and Gostin, 2001
Diaplectic Glass
No
Coesite
No
Stisovite
No

References

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Victor A Gostin, George E Williams, Colin D Branch (1986) Giant impact structure and widely dispersed ejecta in the Precambrian of South Australia, Abstracts - Geological Society of Australia 15, p. 84, Sydney, N.S.W., Australia (AUS): Geological Society of Australia, Sydney, N.S.W., url

G E Williams (1986) The Acraman Impact Structure Source of Ejecta in Late Precambrian Shales, South Australia, Science 233(4760), p. 200-203, pubmed, doi:10.1126/science.233.4760.200

S L Baldwin, I McDougall, G E Williams (1991) K/Ar and 40Ar/39Ar analyses of meltrock from the Acraman impact structure, Gawler Ranges, South Australia, Australian Journal of Earth Sciences 38(3), p. 291-298, url, doi:10.1080/08120099108727973

G E Williams, V A Gostin (2010) Geomorphology of the Acraman impact structure, Gawler Ranges, South Australia, Cuadernos do Laboratorio Xeoloxico de Laxe 35, p. 209-220, url

B P Glass, B M Simonson (2012) Distal impact ejecta layers: Spherules and more, Elements 8(1), p. 43-48, GeoScienceWorld, pdf, doi:10.2113/gselements.8.1.43

M Schmieder, E Tohver, F Jourdan, S W Denyszyn, P W Haines (2015) Zircons from the Acraman impact melt rock (South Australia): Shock metamorphism, U–Pb and 40Ar/39Ar systematics, and implications for the isotopic dating of impact events, Geochimica et Cosmochimica Acta 161, p. 71-100, Pergamon, url, doi:10.1016/J.GCA.2015.04.021