Structural evolution of the Sudbury impact structure in the light of seismic reflection data

Boerner, David E.; Milkereit, B.

doi:10.1130/0-8137-2339-6.419

Cited by 6 publications

(7 citation statements)

References 39 publications

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“…This is best explained by a thrust as the base of the Levack Gneiss. Seismic evidence for the existence for such a thrust surface between the Levack Gneiss and the underlying Cartier Granite has been reported by Boerner and Milkereit [1999].…”

Section: Observational Evidencementioning

confidence: 95%

The Sudbury Structure: A circular impact crater?

Morris

2002

Geophysical Research Letters

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[1] Petrological, geochemical, and structural evidence supports genesis of the Sudbury Structure by a meteorite impact. The Sudbury Igneous Complex (SIC) represents the ponded melt sheet. The primary morphology and size of the Sudbury Crater remains the subject of extensive discussion. A model is presented explaining the transformation of an originally circular crater to the current elliptical form. Processes involved in the geometrical transformation include; a) volume reduction through melt sheet crystallization, and repeated expulsion of melt into the surrounding footwall, b) translation and segmentation on multiple southeast dipping thrust surfaces, and c) relative displacement on steep north-northwest trending faults. Paleomagnetic, geochemical and structural evidence supports the concept of periodic melt expulsions into the footwall. Seismic, potential field and paleomagnetic surveys provide evidence in support of multiple thrust surfaces. After over 9 km of subsequent erosion only a small volumetric portion of the original SIC remains, although complete vertical sections through the melt sheet have been preserved. None of the crater wall has been preserved. Thus the contacts between the SIC and the footwall on the North and South Ranges are interpreted as uplifted crater floor margins.

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Section: Observational Evidencementioning

confidence: 95%

The Sudbury Structure: A circular impact crater?

Morris

2002

Geophysical Research Letters

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“…This reflector has no currently known geologic surface expression. Although Boerner and Milkereit (1999) proposed that structures such as the Benny Belt and Pumphouse shear zones pre-date the impact, the presence of pseudotachylitic breccia suggests that these shear zones were (re)activated as a consequence of the impact at Sudbury (Fueten et al 1992). Kellet and Rivard (1996) also noted an overprinting fabric on the pseudotachylitic breccia that suggests some post-impact Penokean deformation on the faults in the Benny Belt shear zone.…”

Section: Sudbury Canadamentioning

confidence: 99%

“…These seismic data included a third reflector, interpreted to be tectonic in origin, intermediate in distance between the Benny Belt and Pumphouse Creek shear zones ( Fig. 5; Moon and Miao 1997;Boerner and Milkereit 1999). This reflector has no currently known geologic surface expression.…”

Section: Sudbury Canadamentioning

confidence: 99%

Observations and interpretations at Vredefort, Sudbury, and Chicxulub: Towards an empirical model of terrestrial impact basin formation

Grieve

Reimold

Morgan

et al. 2008

Meteorit & Planetary Scien

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Abstract-The structural, topographic and other characteristics of the Vredefort, Sudbury, and Chicxulub impact structures are described. Assuming that the structures originally had the same morphology, the observations/interpretations for each structure are compared and extended to the other structures. This does not result in any major inconsistencies but requires that the observations be scaled spatially. In the case of Vredefort and Sudbury, this is accomplished by scaling the outer limit of particular shock metamorphic features. In the case of Chicxulub, scaling requires a reasoned assumption as to the formation mechanism of an interior peak ring. The observations/interpretations are then used to construct an integrated, empirical kinematic model for a terrestrial peak-ring basin. The major attributes of the model include: a set of outward-directed thrusts in the parautochthonous rocks of the outermost environs of the crater floor, some of which are pre-existing structures that have been reactivated during transient cavity formation; inward-directed motions along the same outermost structures and along a set of structures, at intermediate radial distances, during transient cavity collapse; structural uplift in the center followed by a final set of radially outward-directed thrusts at the outer edges of the structural uplift, during uplift collapse. The rock displacements on the intermediate, inward and innermost, outward sets of structures are consistent with the assumption that a peak ring will result from the convergence of the collapse of the transient cavity rim area and the collapse of the structural uplift.

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“…The original basin/crater shape is not believed to have been circular, but elliptical with the long axis/short axis ratio estimated as 1.5 prior to deformation, and 2.2 after deformation (Rousell, 1984a). Cantin and Walker (1972), Rousell (1972Rousell ( , 1984a, and Rousell et al (1997) provide evidence o f the original ellipsoid-shaped basin/crater based on paleocurrent measurements in the Chelmsford Formation, however, Boener and Milkereit (1999) suggest that later deformation (shortening) may bias the paleocurrent indicators. Cowan and Schwerdtner (1994) discuss how the originally horizontal layering o f the SIC may have undergone solid-body tilting (folding) to create the elliptical basin Reproduced with permission of the copyright owner.…”

Section: Post-sudbury Event Metamorphism and Deformationmentioning

confidence: 99%

“…More recent work by Cowan et al (1999) however, reports three independent lines o f structural evidence from the Sudbury Structure which suggest that the SIC was not a horizontal sheet at the time o f consolidation, and that it was originally parabolic in plan view (non-circular) at this time as well. Boemer and Milkereit (1999) acknowledge the generally undeformed state o f the North Range in comparison to the South Range, and use seismic data in conjunction with geologic and geochemical data to suggest that the "North Range was somehow mechanically decoupled from collision and subsequent relaxation", and that the "decoupling may have been accomplished in zones and could be related to the highmetamorphic grade contrasts across the Murray Fault Zone. "…”

Section: Post-sudbury Event Metamorphism and Deformationmentioning

confidence: 99%

Field relationships, petrology, geochemistry, and petrogenesis of quartz dioritic magmas, Whistle Offset, Sudbury structure, Canada

Carter¹

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The author has granted a non exclusive license allowing Library and Archives Canada to reproduce,. publish, archive, preserve, conserve, communicate to the public by telecommunication.or on the Internet, loan, distribute and sell theses worldwide, for commercial or non commercial purposes, in microform, paper, electronic and/or any other formats. AVIS: L'auteur a accorde une licence non. exclusive permettant a la Bibliotheque et Archives Canada de reproduire, publier, archiver, sauvegarder, conserver, transmettre au public par telecommunication ou par I'lnternet, preter, distribuer et vendre des theses partout dans le monde, a des fins commerciales ou autres, sur support microforme, papier, electronique et/ou autres formats. Bien que ces formulaires aient inclus dans la pagination, il n'y aura aucun contenu manquant. Canada Reproduced with permission of the copyright owner. Further reproduction prohibited without permission.

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Structural evolution of the Sudbury impact structure in the light of seismic reflection data

Cited by 6 publications

References 39 publications

The Sudbury Structure: A circular impact crater?

The Sudbury Structure: A circular impact crater?

Observations and interpretations at Vredefort, Sudbury, and Chicxulub: Towards an empirical model of terrestrial impact basin formation

Field relationships, petrology, geochemistry, and petrogenesis of quartz dioritic magmas, Whistle Offset, Sudbury structure, Canada

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