Jeerinah - Impact Deposit

Alternate Names N/A
Coordinates 22° 33' 0" S; 119° 30' 0" E
Notes
  1. Lat and long correspond drill site where this layer was discovered (Simonson et al., 2000)
Country Australia

Related Countries :
  1. Australia
Region Western Australia - Hamersley Province
Date Confirmed 2000
Notes
  1. Simonson et al., 2000
Age (Ma) 2629 ± 5
Notes :
  1. Trendall et al., 2004

Method :
  1. SHRIMP U-Pb zircon dating
Impactor Type Most likely chondrite-type body (Shukolyukov et al., 2002)
Notes
  1. May share an impactor with the Monteville spherule layer, impactor 6.3-46 km in diameter (Johnson and Melosh, 2012).

Advanced Data Fields

Notes

Local Language
N/A
Spherules
Yes
Tektites
Unknown
Indivudual Glass Clasts
Unknown
Source Crater
Unknown
Geology
At the top of the Jeerinah Formation within the Fortescue Group, just underlying the Paraburdoo Member of the Wittenoom Formation, wiithin the lower Hamersley Group (Simonson et al., 2000; Rasmussen et al., 2005)
  1. The Jeerinah and Carawine layers are most likely equivalent, based on dating, petrographic, and geochemical data (Rasmussen et al., 2005)
Other Shock Metamorphism
Unknown
Shatter Cones
No
Planar Fractures
No
Planar Deformation Features
Yes
  1. Rasmussen and Koeberl, 2004; Smith et al., 2016
Diaplectic Glass
No
Coesite
No
Stisovite
No

References

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B M Simonson, D Davies, S W Hassler (2000) Discovery of a layer of probable impact melt spherules in the Late Archaean Jeerinah Formation, Fortescue Group, Western Australia, Australian Journal of Earth Sciences 47(2), p. 315-325, Taylor & Francis Group, url, doi:10.1046/j.1440-0952.2000.00784.x

A Shukolyukov, P Castillo, B M Simonson, G W Lugmair (2002) Chromium in late Archean spherule layers from Hamersley Basin, Western Australia: Isotopic evidence for extraterrestrial component, 33rd Annual Lunar and Planetary Science Conference, p. 1369, url

A F Trendall, W Compston, D R Nelson, J R De Laeter, V C Bennett (2004) SHRIMP zircon ages constraining the depositional chronology of the Hamersley Group, Western Australia, Australian Journal of Earth Sciences 51(5), p. 621-644, url, doi:10.1111/j.1400-0952.2004.01082.x

B Rasmussen, C Koeberl (2004) Iridium anomalies and shocked quartz in a Late Archean spherule layer from the Pilbara craton: New evidence for a major asteroid impact at 2.63 Ga, Geology 32(12), p. 1029-1032, doi:10.1130/G20825.1

B Rasmussen, T S Blake, I R Fletcher (2005) U-Pb zircon age constraints on the Hamersley spherule beds: Evidence for a single 2.63 Ga Jeerinah-Carawine impact ejecta layer, Geology 33(9), p. 725-728, Geological Society of America, url, doi:10.1130/G21616.1

B C Johnson, H J Melosh (2012) Impact spherules as a record of an ancient heavy bombardment of Earth, Nature 485(7396), p. 75-77, url, doi:10.1038/nature10982

B C Johnson, H J Melsoh (2012) New estimates for the number of large impacts throughout Earth's history, Early Solar System Impact Bombardment II, url

F C Smith, B P Glass, B M Simonson, J P Smith, A E Krull-Davatzes, K S Booksh (2016) Shock-metamorphosed rutile grains containing the high-pressure polymorph TiO2-II in four Neoarchean spherule layers, Geology 44(9), p. 775-778, GeoScienceWorld, url, doi:10.1130/G38327.1