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Montagnais impact structure

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Journal Article
Journal: GSA Bulletin
Published: 01 April 1989
GSA Bulletin (1989) 101 (4): 450–463.
... complex impact craters and may be a function of impact into a marine environment.Dating by 39 Ar/ 40 Ar indicates that the impact occurred at about 51 Ma, late early Eocene, and this is confirmed by biostratigraphic data from immediately overlying sediments. The compositional and structural imprint left...
Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE247-p223
... Micropaleontological study of the sedimentary record from the Montagnais impact structure, located on the shelf off Nova Scotia, has shown that the impact had neither regional nor global effects on biological diversity. This result provides new evidence for the lower threshold of extinctions...
Series: GSA Special Papers
Published: 29 November 2018
DOI: 10.1130/2018.2537
EISBN: 9780813795379
... ABSTRACT The late Eocene Chesapeake Bay impact structure was formed in a multilayered target of seawater underlain sequentially by a sediment layer and a rock layer in a continental-shelf environment. Impact effects in the “brim” (annular trough) surrounding and adjacent to the transient crater...
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Journal Article
Published: 04 December 2012
Canadian Journal of Earth Sciences (2012) 49 (12): 1567–1594.
...Mark E. Deptuck; D. Calvin Campbell Abstract The ∼51 Ma Montagnais impact crater on the outer Scotian Shelf is well known, but the potential effects from the impact event on the slope and rise seaward of the crater have, until now, remained poorly understood. Through detailed seismic stratigraphic...
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Journal Article
Published: 01 January 2000
Geological Magazine (2000) 137 (1): 67–80.
.... Knowledge of the correct size and morphology of the resulting crater is crucial for calculating the global effects of marine impact events. The Lockne, Kärdla, Granby, Hummeln and Tvären craters are preserved in the marine Lower Palaeozoic sediments of the Baltic Shield. The structures...
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Journal Article
Journal: The Leading Edge
Published: 01 August 2012
The Leading Edge (2012) 31 (8): 892–897.
... the site of a meteor impact in a shallow marine to transition zone environment at the end of the Ordovician Period. Impact structures, or astroblemes, are one the of rarest structures in the geologic record. Presently there are 182 confirmed impact structures on the planet with roughly two-thirds...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2016
GSA Bulletin (2016) 128 (1-2): 47–80.
..., Antarctica : Marine Geology , v. 193 , p. 235 – 252 , doi:10.1016/S0025-3227(02)00664-3. Jansa L.F. Pepiper G. Robertson P.B. Friedenreich O. , 1989 , Montagnais: A submarine impact structure on the Scotian shelf, eastern Canada : Geological Society of America Bulletin , v. 101...
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Journal Article
Journal: Palynology
Published: 03 July 2017
Palynology (2017) 41 (3): 430–437.
... in the Scotian Basin, probably stripped during the Montagnais impact event some 50 million years ago (Weston et al. 2012 ; Deptuck & Campbell 2012 ). Here, then, is a ‘first pass’ practical biostratigraphic observation – wetzelielloids with an epeliform archaeopyle are primarily Early Eocene in age...
Journal Article
Published: 27 November 2018
Journal of the Geological Society (2019) 176 (2): 209–224.
... Basin were at the time of impact Harper 1981 7 Charlevoix 17–27 Charnockite gneiss, granite gneiss, migmatized paragneiss, and some anorthite ( Trepmann et al. 2005 ). Kfs shock features within 2 km of impact structure centre ( Robertson 1975 ) Robertson 1975 ; Trepmann et al. 2005 8...
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Journal Article
Journal: Palynology
Published: 01 June 2012
Palynology (2012) 36 (Suppl_1): 80–95.
..., in discussions of the age of the Montagnais impact crater ( Jansa et al. 1989 , crediting a 1984 internal report by E.H. Davies). Impact-damaged dinocysts from the Chesapeake impact structure have been reported and illustrated by Edwards and Powars (2003) , Horton et al. (2005) , Frederiksen et al. (2005...
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Journal Article
Journal: Geology
Published: 01 January 2001
Geology (2001) 29 (1): 51–54.
... , D. , 1988 , Age measurement of the submarine Montagnais impact crater : Geophysical Research Letters , v. 15 , p. 1409 – 1412 . Boundy , T.M. , Essene , E.J. , Hall , C.M. , Austrheim , H. , and Halliday , A.N. , 1996 , Rapid exhumation of lower crust during...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2011
GSA Bulletin (2011) 123 (1-2): 371–383.
... or absent due to reworking of sediments by water surging back into the crater, as characterized by the Montagnais, Mjølnir, and Chesapeake Bay structures ( Dypvik and Jansa, 2003 ). Additional evidence of a water impact includes resurge gullies eroded into the crater rim along with a thickening of fall-out...
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Journal Article
Published: 25 November 2012
Canadian Journal of Earth Sciences (2012) 49 (12): 1417–1462.
... ) and the location of major structural features. (B) Location map of exploration wells on the Scotian Margin, with studied wells highlighted and named. The oldest sediments in the Scotian Basin are related to the breakup of Pangea and began to accumulate in small grabens during the Triassic ( Barss et al...
Journal Article
Journal: GSA Bulletin
Published: 01 September 2007
GSA Bulletin (2007) 119 (9-10): 1135–1150.
...C. Lana; C.R. Souza Filho; Y.R. Marangoni; E. Yokoyama; R.I.F. Trindade; E. Tohver; W.U. Reimold Abstract The 40-km-wide Araguainha structure is the largest and best-exposed complex impact crater in South America. It was excavated in flat-lying sediments of the intracratonic Paraná Basin, where...
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Journal Article
Published: 23 October 2012
Canadian Journal of Earth Sciences (2012) 49 (12): 1558–1566.
... the data in Pe-Piper and Jansa 1999 ). The most southwesterly well with metasedimentary basement rocks, Montagnais I-94, yielded an age of 362 ± 2 Ma ( Pe-Piper and Jansa 1999 ), an age similar to ones obtained from plutons sampled at the Ojibwa E-07 and Crow F-52 wells (362 ± 12 and 352 ± 2 Ma...
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Journal Article
Published: 01 May 2009
Journal of the Geological Society (2009) 166 (3): 393–411.
...Gerta Keller; Thierry Adatte; Alfonso Pardo Juez; Jose G. Lopez-Oliva Abstract: In the 1990s the Chicxulub impact was linked to the K–T boundary by impact spherules at the base of a sandstone complex that was interpreted as an impact-generated tsunami deposit. Since that time a preponderance...
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Journal Article
Journal: Economic Geology
Published: 01 May 2017
Economic Geology (2017) 112 (3): 675–692.
... that hosts the Pipe 2 ores, which is similar in lithologic composition and structural setting to the mineralized ultramafic bodies at Birchtree, represents the southernmost member of a discontinuous sequence of ultramafic rocks that stretches north-northeastward from the Pipe 2 open pit along the west shore...
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Journal Article
Published: 01 September 2007
Journal of the Geological Society (2007) 164 (5): 923–936.
... ; Hughes 2000 ). Very large HVI craters, such as the 300 km diameter Vredefort crater (2023 ± 4 Ma, Kamo et al . 1996 ; Moser 1997 ) in South Africa and the 250 km diameter deformed Sudbury impact structure in Canada (1850 ± 3 Ma, Krogh et al . 1982 ), formed large melt pools in their cores, which...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(06)
... The late Eocene Chesapeake Bay impact structure, located on the Atlantic margin of Virginia, may be Earth's best-preserved large impact structure formed in a shallow marine, siliciclastic, continental-shelf environment. It has the form of an inverted sombrero in which a central crater ∼40 km...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.256.01.22
EISBN: 9781862395046
..., then believed to be a maar, although it is now listed as an impact crater (Table 1 ). Table 1. The list of craters and structures worldwide attributed to impact and widely accepted as such, as at 3 November 2004 (from Grieve 2004 ) (source: http.//www.unb.ca/passc/ImpactDatabase/CINameSort.html...
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