Debrisites from the Sudbury impact event in Ontario, north of Lake Superior, and a new age constraint: Are they base-surge deposits or tsunami deposits?

Addison, William D.; Brumpton, Gregory R.; Davis, Don W.; Fralick, Philip; Kissin, S. A.

doi:10.1130/2010.2465(16)

Cited by 5 publications

(24 citation statements)

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“…The same is true at the Sudbury ejecta sites that contain megabreccias, where the megaclasts were not derived from the impact crater (not documented in this paper; see Addison et al. ), but are locally derived. A base surge has been proposed to explain deposition of the Sudbury ejecta (Addison et al.…”

Section: Discussionsupporting

confidence: 59%

“…Another possible explanation for the difference in reworking of material is that large blocks (observed up to 8 m in diameter at some ejecta locations; see Addison et al. ) may have generated additional wave activity near the Connors Creek site, while such blocks should be less common at greater distances from the impact site.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, Addison et al. () described the petrography and stratigraphy of an additional eight sites, but did not present geochemical data.…”

Section: Introductionmentioning

confidence: 99%

“…The stratigraphy of most of these sites indicates deposition into shallow water settings, although some of the sites from Ontario may have been deposited in a subaerial setting (Addison et al. ). The sites south of Lake Superior, in the United States, were almost certainly deposited in a foreland basin (Schulz and Cannon ; Cannon et al.…”

Section: Introductionmentioning

confidence: 99%

“…The primary components of ejecta deposits are (1) altered melt droplets; (2) shocked mineral grains, including quartz, feldspar, and micas; (3) unshocked lithic material, predominantly quartz and chert; and (4) accretionary lapilli (Addison et al. , ; Pufahl et al. ; Cannon et al.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

“…Finally, Addison et al. () described the petrography and stratigraphy of an additional eight sites, but did not present geochemical data.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrography and geochemistry of ejecta from the Sudbury impact event

Huber

McDonald

Koeberl

2014

Meteorit & Planetary Scien

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Aggregation in particle rich environments: a textural study of examples from volcanic eruptions, meteorite impacts, and fluidized bed processing

et al. 2018

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Aggregation is a common process occurring in many diverse particulate gas mixtures (e.g. those derived from explosive volcanic eruptions, meteorite impact events, and fluid bed processing). It results from the collision and sticking of particles suspended in turbulent gas/air. To date, there is no generalized model of the underlying physical processes. Here, we investigate aggregates from 18 natural deposits (16 volcanic deposits and two meteorite impact deposits) as well as aggregates produced experimentally via fluidized bed techniques. All aggregates were analyzed for their size, internal structuring, and constituent particle size distribution. Commonalities and differences between the aggregate types are then used to infer salient features of the aggregation process. Average core to rim ratios of internally structured aggregates (accretionary lapilli) is found to be similar for artificial and volcanic aggregates but up to an order of magnitude different than impact-related aggregates. Rim structures of artificial and volcanic aggregates appear to be physically similar (single, sub-spherical, regularly-shaped rims) whereas impact-related aggregates more often show multiple or irregularly shaped rims. The particle size distributions (PSDs) of all three aggregate types are similar (< 200 μm). This proves that in all three environments, aggregation occurs under broadly similar conditions despite the significant differences in source conditions (particle volume fraction, particle size distribution, particle composition, temperature), residence times, plume conditions (e.g., humidity and temperature), and dynamics of fallout and deposition. Impact-generated and volcanic aggregates share many similarities, and in some cases may be indistinguishable without their stratigraphic context.Electronic supplementary materialThe online version of this article (10.1007/s00445-018-1207-3) contains supplementary material, which is available to authorized users.

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References and Sudbury Bibliography

2017

Nickel Sulfide Ores and Impact Melts

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Debrisites from the Sudbury impact event in Ontario, north of Lake Superior, and a new age constraint: Are they base-surge deposits or tsunami deposits?

Cited by 5 publications

References 0 publications

Petrography and geochemistry of ejecta from the Sudbury impact event

Petrography and geochemistry of ejecta from the Sudbury impact event

Aggregation in particle rich environments: a textural study of examples from volcanic eruptions, meteorite impacts, and fluidized bed processing

References and Sudbury Bibliography

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