The age of Wolfe Creek meteorite crater (Kandimalal), Western Australia

1,2Timothy T. BARROWS,3John MAGEE,4Gifford MILLER,5L. Keith FIFIELD
Meteoritics & Planetary Society (in Press) Link to Article [doi: 10.1111/maps.13378]
1School of Earth and Environmental Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia
2Department of Geography, University of Portsmouth, Portsmouth PO1 2UP, UK
3Research School of Earth Sciences, Australian National University, Canberra, Australian Capital Territory 0200, Australia
4INSTAAR and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA
5Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra,Australian Capital Territory 2601, Australia
Published by arrangement with John Wiley & Sons

Wolfe Creek crater lies in northwestern Australia at the edge of the Great SandyDesert. Together with Meteor Crater, it is one of the two largest craters on Earth fromwhich meteorite fragments have been recovered. The age of the impact is poorly constrainedand unpublished data places the event at about 300,000 years ago. In comparison, MeteorCrater is well constrained by exposure dating. In this paper, we present new ages for WolfeCreek Crater from exposure dating using the cosmogenic nuclides10Be and26Al, togetherwith optically stimulated luminescence ages (OSL) on sand from a site created by theimpact. We also present a new topographic survey of the crater using photogrammetry. Theexposure ages range from~86 to 128 ka. The OSL ages indicate that the age of the impactis most likely to be~120 ka with a maximum age of 137 ka. Considering the geomorphicsetting, the most likely age of the crater is 1209 ka. Last, we review the age of MeteorCrater in Arizona. Changes in production rates and scaling factors since the original datingwork revise the impact age to 61.14.8 ka, or~20% older than previously reported.


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