Acraman
| Crater Name | Location | Latitude | Longitude | Diameter (km) | Age (Ma) | Exposed | Drilled | Target Rock** | Bolide Type*** |
|---|---|---|---|---|---|---|---|---|---|
| Acraman | South Australia | S 32° 1' | E 135° 27' | 90 | ~ 590 | Y | N | C | Chondrite |
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1. Landsat image
2. Aeromagnetic image of the Acraman area of the Gawler Craton, covering the Landsat scene (see image below). ER Mapper file: total magnetic intensity, pseudocolor (Gaussian equalisation histogram stretch), sun angle from the northeast. From Williams, Schmidt and Boyd (1996).
3. Landsat scene covering most of the Acraman impact structure in the Mesoproterozoic Gawler Range Volcanics, showing: 1, Lake Acraman within the Acraman depression; 2, Lake Gairdner; 3, Lake Everard; 4, the Yardea corridor at 85-90 km diameter. Surface water (darker blue) in Lake Gairdner helps define an arcuate trend (5) at ~150 km diameter that continues westward to Lake Everard. X marks the location of a central dipolar magnetic anomaly in the southeastern part of Lake Acraman. Landsat scene 15 February 1973, scene center S31-30 E135-51. From Williams, Schmidt and Boyd (1996).
4. DEM Image Provided by Dr. Carlos Roberto de Souza Filho
5 & 6. Image Provided by Dr. Carlos Roberto de Souza Filho
References |
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| * pre-1977 K-Ar, Ar-Ar and Rb-Sr ages recalculated using the decay constants of Steiger and Jager (1977) Ages in millions of years (Ma) before present. ** Abbreviations: C - Crystalline Target; C-Ms - Metasedimentary Target; M - Mixed Target (i.e.sedimentary strata overlying crystalline basement); S - sedimentary target (i.e. no crystalline rocks affected by the impact event). From Osinski. G. R., Spray J. G., and Grieve R. A. F. 2007. Impact melting in sedimentary target rocks: A synthesis. In The Sedimentary Record of Meteorite Impacts, Geological Society of America Special Paper. Editors: Evans K. Horton W., King D., Morrow J., and Warme J. Geological Society of America: Boulder, in press. ***From Koeberl,C. Identification of meteoritic components in impactites. 1998, Koeberl, C. The Geochemistry and Cosmochemistry of Impacts. 2007 and PASSC Files. (IAB, IIIAB, IIIB, IIID - Iron Meteorite) |