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Saint Martin impact structure: Difference between revisions

Coordinates: 51°47′N 98°32′W / 51.783°N 98.533°W / 51.783; -98.533
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{{Short description|Asteroid impact crater in Manitoba, Canada}}
{{Infobox terrestrial impact site
{{Infobox terrestrial impact site
| name = Saint Martin crater
| name = Saint Martin impact structure
| other_name =
| other_name =
| photo =
| photo =
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| map = Canada
| map = Canada
| map_alt =
| map_alt =
| map_caption = Location of the crater in Canada
| map_caption = Location of the impact structure in Canada
| map_size =
| map_size =
| location =
| location =
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| topo =
| topo =
| access =
| access =
| country = {{CAN}}
| country = [[Canada]]
| state = [[Manitoba]]
| province = [[Manitoba]]
| province =
| district =
| district =
| municipality = [[Rural Municipality of Grahamdale|Grahamdale]]
| municipality = [[Rural Municipality of Grahamdale|Grahamdale]]
}}
}}
'''Saint Martin''' is an [[impact crater|impact]] [[impact crater|crater]] in [[Manitoba]], Canada.<ref name=EIDBSaintMartin>{{Cite Earth Impact DB |name=Saint Martin |linkname=Saintmartin |accessdate=15 September 2019}}</ref> It is located in the northern part of the [[Rural Municipality of Grahamdale]], northwest of [[Lake St. Martin]].
'''Saint Martin''' is an [[impact structure]] in [[Manitoba]], Canada.<ref name=EIDBSaintMartin>{{Cite Earth Impact DB |name=Saint Martin |linkname=Saintmartin |access-date=15 September 2019}}</ref> It is located in the northern part of the [[Rural Municipality of Grahamdale]], northwest of [[Lake St. Martin]].


The crater is {{convert|40|km|abbr=on}} in diameter and its age was determined to be 227.8 ± 1.1 million years<ref>Schmieder M., Jourdan F., Tohver, E. and Cloutis, E. A. 2014. <sup>40</sup>Ar/<sup>39</sup>Ar age of the Lake Saint Martin impact structure (Canada) - Unchaining the Late Triassic terrestrial impact craters. Earth Planet. Sci. Lett. (in press)</ref> ([[Carnian]] stage of the [[Triassic]]) using the [[argon-argon dating]] technique. The crater is well preserved but poorly exposed at the surface as the whole region is covered by glacial drift.
The impact structure is {{convert|40|km|abbr=on}} in diameter and its age was determined to be 227.8 ± 1.1 million years<ref>Schmieder M., Jourdan F., Tohver, E. and Cloutis, E. A. 2014. <sup>40</sup>Ar/<sup>39</sup>Ar age of the Lake Saint Martin impact structure (Canada) - Unchaining the Late Triassic terrestrial impact craters. Earth Planet. Sci. Lett. (in press)</ref> ([[Carnian]] stage of the [[Triassic]]) using the [[argon-argon dating]] technique. The crater is well preserved but poorly exposed at the surface as the whole region is covered by glacial drift.


== Hypothetical multiple impact event ==
== Hypothetical multiple impact event ==
{{main|Manicouagan crater#Hypothetical multiple impact event}}
{{main|Manicouagan impact structure#Hypothetical multiple impact event}}


It had previously been suggested by [[Geophysicist]] David Rowley of the [[University of Chicago]], working with John Spray of the [[University of New Brunswick]] and Simon Kelley of the [[Open University]], that the Saint Martin crater may have been part of a hypothetical multiple impact event which also formed the [[Manicouagan crater]] in northern [[Quebec]], [[Rochechouart crater]] in France, [[Obolon' crater]] in [[Ukraine]], and [[Red Wing crater]] in [[North Dakota]].<ref name="Spray-1998">Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". ''[[Nature (journal)|Nature]]'', v. 392, pp. 171-173. [http://www.nature.com/nature/journal/v392/n6672/abs/392171a0.html Abstract]</ref> All of the craters had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these craters could be aligned like this due to chance are nearly zero.<ref>{{Cite news | last = Steele | first = Diana | author-link = | last2 = | first2 = | author2-link = | title = Crater chain points to impact of fragmented comet | newspaper = University of Chicago Chronicle | pages = | year = | date = 19 March 1998 | url = http://chronicle.uchicago.edu/980319/craters.shtml | postscript = <!--None-->}}</ref> However, refined ages for the mentioned impact craters that differ by several million years contradict the multiple impact hypothesis.{{Citation needed|date=January 2016}}
It had previously been suggested by [[Geophysicist]] David Rowley of the [[University of Chicago]], working with John Spray of the [[University of New Brunswick]] and Simon Kelley of the [[Open University]], that the Saint Martin structure may have been part of a hypothetical multiple impact event which also formed the [[Manicouagan impact structure]] in northern [[Quebec]], [[Rochechouart impact structure]] in France, [[Obolon' crater]] in [[Ukraine]], and [[Red Wing crater]] in [[North Dakota]].<ref name="Spray-1998">Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". ''[[Nature (journal)|Nature]]'', v. 392, pp. 171-173. [http://www.nature.com/nature/journal/v392/n6672/abs/392171a0.html Abstract]</ref> All of the impact structures had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these structures could be aligned like this due to chance are nearly zero.<ref>{{Cite news | last = Steele | first = Diana | title = Crater chain points to impact of fragmented comet | newspaper = University of Chicago Chronicle | date = 19 March 1998 | url = http://chronicle.uchicago.edu/980319/craters.shtml }}</ref>


== References ==
== References ==
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== External links ==
== External links ==
* [http://www.passc.net/EarthImpactDatabase/saintmartin.html Earth Impact Database]
* [http://www.passc.net/EarthImpactDatabase/New%20website_05-2018/Saintmartin.html Earth Impact Database]
* [http://craterexplorer.ca/st-martin-impact-structure/ Aerial exploration of the St. Martin structure]
* [http://craterexplorer.ca/st-martin-impact-structure/ Aerial exploration of the St. Martin structure]
{{Portal|Geology|Canada

}}
{{Impact cratering on Earth}}
{{Impact cratering on Earth}}


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[[Category:Triassic impact craters]]
[[Category:Triassic impact craters]]
[[Category:Triassic Canada]]
[[Category:Triassic Canada]]

{{Manitoba-geo-stub}}
{{Canada-geology-stub}}

Latest revision as of 17:10, 25 March 2024

Saint Martin impact structure
Saint Martin impact structure is located in Canada
Saint Martin impact structure
Location of the impact structure in Canada
Impact crater/structure
ConfidenceConfirmed
Diameter40 km (25 mi)
Age227.8 ± 1.1 Ma
Carnian
ExposedNo
DrilledYes
Location
Coordinates51°47′N 98°32′W / 51.783°N 98.533°W / 51.783; -98.533
CountryCanada
ProvinceManitoba
MunicipalityGrahamdale

Saint Martin is an impact structure in Manitoba, Canada.[1] It is located in the northern part of the Rural Municipality of Grahamdale, northwest of Lake St. Martin.

The impact structure is 40 km (25 mi) in diameter and its age was determined to be 227.8 ± 1.1 million years[2] (Carnian stage of the Triassic) using the argon-argon dating technique. The crater is well preserved but poorly exposed at the surface as the whole region is covered by glacial drift.

Hypothetical multiple impact event

[edit]
Main article: Manicouagan impact structure § Hypothetical multiple impact event

It had previously been suggested by Geophysicist David Rowley of the University of Chicago, working with John Spray of the University of New Brunswick and Simon Kelley of the Open University, that the Saint Martin structure may have been part of a hypothetical multiple impact event which also formed the Manicouagan impact structure in northern Quebec, Rochechouart impact structure in France, Obolon' crater in Ukraine, and Red Wing crater in North Dakota.[3] All of the impact structures had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the chance that these structures could be aligned like this due to chance are nearly zero.[4]

References

[edit]
  1. ^ "Saint Martin". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 15 September 2019.
  2. ^ Schmieder M., Jourdan F., Tohver, E. and Cloutis, E. A. 2014. 40Ar/39Ar age of the Lake Saint Martin impact structure (Canada) - Unchaining the Late Triassic terrestrial impact craters. Earth Planet. Sci. Lett. (in press)
  3. ^ Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". Nature, v. 392, pp. 171-173. Abstract
  4. ^ Steele, Diana (19 March 1998). "Crater chain points to impact of fragmented comet". University of Chicago Chronicle.
[edit]
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