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Friction melt distribution in a multi-ring impact basin

Nature volume 373, pages 130–132 (1995)Cite this article

Abstract

IT is generally accepted that multi-ring basins are the consequence of very large impacts, but the mechanism by which they form is still a matter of contention1,2. Most of what is currently known about multi-ring basins is based on remote studies of the Moon3–5 and, to a lesser extent, Mars and Mercury4,6. But at least two multi-ring impact basins have been recognized on Earth7?the Sudbury8 (Canada) and Vredefort9 (South Africa) impact structures-providing an opportunity to study their properties directly. Here we describe the distribution of friction melt (pseudotachylyte) in the floor of the Sudbury impact basin. Although the veins and dykes of pseudotachylyte decrease in both thickness and frequency of occurrence towards the basin periphery, the greatest volumes of friction melt appear to define four rings around the central impact melt sheet. Field evidence indicates that the rings originated as zones of large displacement, which facilitated localized frictional melting of the basin floor during the modification (collapse) stage of the cratering process. By analogy, we argue that the rings of other multi-ring impact basins are also likely to be the remnants of such large-displacement fault zones.

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Authors and Affiliations

  1. Department of Geology, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada

    John G. Spray & Lucy M. Thompson

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  1. John G. Spray
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  2. Lucy M. Thompson
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Spray, J., Thompson, L. Friction melt distribution in a multi-ring impact basin. Nature 373, 130–132 (1995). https://doi.org/10.1038/373130a0

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