| | Journal (article/letter/editorial) | Argon-40/argon-39 age of the El'gygytgyn impact event, Chukotka, Russia PAULW. LAYER Geophysical Institute...Abstract-Lake El'gygytgyn, Chukotka, Russia, lies in a -18 km crater of presumably impact origin. The crater...volcanic rocks of the Okhotsk-Chukotka volcanic belt. Laser 40Ar/39Ar dating of impact-melted volcanic rocks...rocks from the rim of Lake El'gygytgyn yields a 10-sample weighted plateau age of 3.58 2 0.04 Ma. The Ar step-heating...degassing of the Cretaceous volcanic rocks during impact melting. This age is consistent with, but more | | Crósta, A.P., Reimold, W.U., Vasconcelos, M.A.R., Hauser, N., Oliveira, G.J.G., Maziviero, M.V., Góes, A.M. (2019) Impact cratering: The South American record – Part 1. Geochemistry, 79 (1) 1-61 doi:10.1016/j.chemer.2018.06.001 | Journal (article/letter/editorial) | www.elsevier.com/locate/chemer Invited review Impact cratering: The South American record – Part 1 ⁎...Keywords: Impact crater Impact structure Impact record Shock metamorphism Meteorite Impact glasses Tektites...Earth’s impact record is known to be rather limited in both time and space. There are ca. 190 impact structures...Earth, representing a minor fraction of all the impact events that contributed to the initial formation...surface of the planet. Moreover, the distribution of impact structures on Earth is manifestly uneven. One continent |
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