Using magnetic susceptibility to find Precambrian impact ejecta: A proposal |
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| Institution: | 1. Lamont–Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA;2. Geological Studies Unit and Fluvial Mechanics Laboratory, Indian Statistical Institute, 203, B.T. Road, Kolkata - 700108, India;1. Centre for Exploration Targeting, School of Earth and Environment, University of Western Australia, Crawley, Australia;2. Department of Earth and Oceans, College of Science, Technology and Engineering, James Cook University, Townsville, Australia;3. Geological Survey of Western Australia, 100 Plain Street, East Perth, Australia;4. Centre for Exploration Targeting, Department of Applied Geology, Curtin University of Technology, Perth, Australia;5. School of the Environment, Washington State University, Pullman, USA;1. Centre for Exploration Targeting, School of Earth Sciences, The University of Western Australia, Perth, Western Australia 6009, Australia;2. Australian Centre for Astrobiology, Earth and Sustainability Research Centre and School of Biological, Earth and Environmental Sciences, The University of New South Wales, Kensington, New South Wales 2052, Australia;3. Commonwealth Scientific and Industrial Research Organization, Mineral Resources, Kensington, Western Australia 6151, Australia;4. Structure Tectonics, Research School of Earth Sciences, Australian National University, Canberra 2601, Australia;1. Geological Studies Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata 700108, India;2. Department of Geological Sciences, Jadavpur University, Kolkata 700032, India;3. School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, NSW 2052, Australia;4. Graduate School of Environment and Information Sciences, Yokohama National University, 79-7, Tokiwadai, Hodogaya, Yokohama 240-8501, Japan;1. Department of Systems Engineering, Faculty of Engineering, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Oczapowskiego 2, Poland;2. Department of Commodity Science and Animal Raw Material Processing, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Oczapowskiego 2, Poland |
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| Abstract: | Layers with high magnetic susceptibility contain heavy minerals that are the most likely to preserve signatures of impact in metamorphosed Precambrian rocks. The following impact indicators are resistant to alteration and metamorphism and are likely to be found in heavy mineral layers: impact diamond, SiC, shocked zircon, high-pressure TiO2 phases, reidite, and high-pressure chromite. Coesite and stishovite could also be present but are not likely to be preserved in rocks metamorphosed above the greenschist facies. Looking for layers with high magnetic susceptibility will also identify layers that might contain concentrations of zircon for dating. |
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