Shatter Cones at Sudbury

Bray, Joshua G.P.

doi:10.1086/627158

Cited by 40 publications

(7 citation statements)

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“…Subsequent studies at Sudbury have verified predictions made on the basis of the impact theory. Shatterconing has been discovered to be widespread in the older rocks around the basin (Dietz and Butler, 1964;Bray et al, 1966), and petrographic shock effects have been observed in inclusions and wallrock associated with the Sudbury-tvpe breccias (French, 1969). Except for the preservation of the "fallback breecia" (Onaping formation) and the presence of the Irruptive itself, the general structure and shock-metamorphic features at Sudbury are very similar to those observed at the Vredefort structure, South Africa (Daly, 1947;Dietz, 1961;Hargraves, 1961;Manton, 1965).…”

Section: Evidence For Impact Origin Of the Sudbury Structure Ontariomentioning

confidence: 99%

Possible relations between meteorite impact and igneous petrogenesis, as indicated by the Sudbury structure, Ontario, Canada

French

1970

Bull Volcanol

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Section: Evidence For Impact Origin Of the Sudbury Structure Ontariomentioning

confidence: 99%

Possible relations between meteorite impact and igneous petrogenesis, as indicated by the Sudbury structure, Ontario, Canada

French

1970

Bull Volcanol

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“…Shatter cones a r e conical fracture features which Dietz believes to be unique indicators of meteorite impact. Subsequent studies (Dietz and Butler, 1964;Bray et al, 1966) have indicated that a zone of shatter coned older rocks is present around the entire Sudbury basin to distances as great as 11 mi. (17 km.)…”

Section: Geology O F the Sudbury Structurementioning

confidence: 99%

Sudbury Structure, Ontario: Some Petrographic Evidence for Origin by Meteorite Impact

French

1967

Science

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Unusual deformation structures, similar to those observed in rocks from known and suspected meteorite impact craters, are observed in inclusions of basement rock in the Onaping formation at Sudbury, Ontario. These features, which include planar sets in quartz parallel to the (0001) and (101̅3) planes, suggest that the Onaping formation consists of shocked and melted material deposited immediately after a meteorite impact which formed the Sudbury basin.

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“…There are numerous shock indicators in and around the SIC, including shatter cones, impact breccias, pseudotachylitic breccia, and planar deformation features (PDFs) in quartz, coesite, and impact diamonds (e.g., French 1970;Rousell et al 2003). Shatter cones occur around the SIC on all sides, being well-developed in the fine-grained sediments of the target material, and apparently more abundant on the southern edge of the structure, including in the city of Sudbury (e.g., Guy Bray and Geological Staff 1966). The SIC is cut by a complex series of large-scale faults that are related to both original emplacement and later deformation, and include the economically important offset dikes.…”

Section: Introduction Sudbury Structurementioning

confidence: 99%

Petrography and geochemistry of ejecta from the Sudbury impact event

Huber

McDonald

Koeberl

2014

Meteorit & Planetary Scien

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Ejecta from the Connors Creek site in Michigan (500 km from the Sudbury Igneous Complex [SIC]), the Pine River site in western Ontario (650 km from the SIC), and the Coleraine site in Minnesota (980 km from the SIC) were petrographically and geochemically analyzed. Connors Creek was found to have approximately 2 m of ejecta, including shocked quartz, melt droplets, and accretionary lapilli; Pine River has similar deposits about 1 m in thickness, although with smaller lapilli; Coleraine contains only impact spherules in a 20 cm‐thick layer (impact spherules being similar to microkrystites or microtektites). The ejecta transition from chaotic deposits of massively bedded impactoclastic material with locally derived detritus at Connors Creek to a deposit with apparently very little detrital material that is primarily composed of melt droplets at Pine River to a deposit that is almost entirely composed of melt spherules at Coleraine. The major and trace element compositions of the ejecta confirm the previously observed similarity of the ejecta deposits to the Onaping Formation in the SIC. Platinum‐group element (PGE) concentrations from each of the sites were also measured, revealing significantly elevated PGE contents in the spherule samples compared with background values. PGE abundances in samples from the Pine River site can be reproduced by addition of approximately 0.2 wt% CI chondrite to the background composition of the underlying sediments in the core. PGE interelement ratios indicate that the Sudbury impact event was probably caused by a chondritic impactor.

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Shatter Cones at Sudbury

Cited by 40 publications

References 0 publications

Possible relations between meteorite impact and igneous petrogenesis, as indicated by the Sudbury structure, Ontario, Canada

Possible relations between meteorite impact and igneous petrogenesis, as indicated by the Sudbury structure, Ontario, Canada

Sudbury Structure, Ontario: Some Petrographic Evidence for Origin by Meteorite Impact

Petrography and geochemistry of ejecta from the Sudbury impact event

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