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Origin and emplacement of Offset Dykes in the Sudbury impact structure: Constraints from Hess
Abstract
Abstract— The Hess Offset is a steeply dipping dyke located 12–15 km north of the 1.85 Ga Sudbury igneous complex (SIC) within the 200–250 km diameter Sudbury impact structure. It is up to 60 m wide and strikes subconcentrically to the SIC for at least 23 km. The main phase of the dyke is granodioritic, but it conforms with what is locally referred to as Quartz Diorite: a term used for all the Offset Dykes of the Sudbury impact structure. Rare earth element data shows that the Hess Offset is genetically related to the SIC. Hess is most closely affiliated with an evolved Felsic Norite component of SIC and not bulk impact melt. This indicates that Hess was emplaced during fractionation of the impact melt sheet, rather than immediately following impact. The main Quartz Diorite phase of the dyke comprises a quartz + plagioclase + hornblende + biotite ± clinopyroxene ± orthopyroxene assemblage. Critically, the Hess Offset occupies a concentric fault system that marks the northern limit of a pseudotachylyte‐rich, shatter cone‐bearing annulus about the SIC. This fault system was active during the modification stage of the impact process.
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The innermost ring structure coincides with the location of the Hess Offset in the North Range.
“This innermost ring structure also coincides with the location of the Hess Offset in the North Range (Wood and Spray 1998).”
From Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling (2004) · cites this paper as Wood and Spray 1998
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Research works printed but not linked: 34
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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
- WOOD, C. R., & SPRAY, J. G.
- Venue
- Meteoritics & Planetary Science
- Publisher
- Wiley
- Published
- 1998-03
- Volume
- 33
- Issue
- 2
- Pages
- 337-347
- ISSN
- 1086-9379
- 1945-5100
- Cited by
- 36
- References
- 0
- Language
- en
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