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Friction melt distribution in a multi-ring impact basin
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 contention. Most of what is currently known about multi-ring basins is based on remote studies of the Moon and, to a lesser extent, Mars and Mercury. But at least two multi-ring impact basins have been recognized on Earth--the Sudbury (Canada) and Vredefort (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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A study of E-type pseudotachylyte distribution along a radial transect in the North Range indicates that its distribution is systematic and not random.
“A study of E-type pseudotachylyte distribution along a radial transect in the North Range (along Highway 144 and parallel trails) indicates that its distribution is systematic and not random (Thompson andSpray 1994, 1996;Spray and Thompson 1995).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Spray and Thompson 1995
Pseudotachylyte at Sudbury has been used as an indicator of crater dimensions.
“Pseudotachylyte occurs throughout the Sudbury structure and it has been used as an indicator of crater dimensions (Spray and Thompson 1995) .”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Spray and Thompson 1995
Several zones of enhanced pseudotachylyte development broadly correspond to concentric ring systems at 25-35 km, 42-48 km and 78-80 km beyond the SIC.
“These broadly correspond to concentric ring systems at 25-35 km, 42-48 km and 78-80 km beyond the SIC (Spray and Thompson 1995).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Spray and Thompson 1995
The presence of at least two rings outside what was the transient cavity suggests that Sudbury is a multiring impact structure.
“The presence of at least two rings outside what was the transient cavity would suggest that Sudbury is a multiring impact structure, as has been previously proposed (Dressler 1984, Spray andThompson 1995;Deutsch et al. 1995).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Spray and Thompson 1995
With the exception of Ring 4, the rings broadly correspond in the field to zones of enhanced E-type pseudotachylyte development.
“With the exception of Ring 4, these rings are found to broadly correspond in the field to zones of enhanced E-type pseudotachylyte development (Spray and Thompson 1995).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Spray and Thompson 1995
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Spray, J. G., Butler, H. R., & Thompson, L. M. (2004) · Meteoritics & Planetary Science · doi:10.1111/j.1945-5100.2004.tb00341.x · Cited by 75
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Metadata
- Authors
- Spray, J. G., & Thompson, L. M.
- Venue
- Nature
- Published
- 1995-01
- Volume
- 373
- Issue
- 6510
- Pages
- 130-132
- ISSN
- 0028-0836
- 1476-4687
- Cited by
- 116
- References
- 0
- Language
- en
- Licence
- www.springer.com/tdm (tdm)
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