Upper Cretaceous to Pleistocene sequence stratigraphy of the Beaufort-Mackenzie and Banks Island areas, Northwest Canada

Dixon, J; Dietrich, Jane S.; McNeil, D H

doi:10.4095/133237

Cited by 45 publications

(50 citation statements)

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“…The depth to this unconformity mapped by Batchelor et al (2013a) matches the depth defined in the Adlartok P-09 well ( Fig. 1) (Dixon et al, 1992).…”

Section: Stratigraphic and Structural Settingsupporting

confidence: 60%

“…Dixon and Dietrich, 1990;Dixon et al, 1992;Dixon, 1996): the Iperk sequence (early Pliocene to mid-Pleistocene) and the Shallow Bay sequence (mid-Pleistocene to Holocene, although no dates have been obtained from samples). The regional unconformity associated with the base of the Iperk sequence was previously defined (e.g.…”

Section: Stratigraphic and Structural Settingmentioning

confidence: 99%

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First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

Riedel

Hong²,

Jin³

et al. 2016

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Abstract:One thousand two hundred twenty kilometres of multichannel seismic data were acquired in the Beaufort Sea in 2013 and 2014 to interpret shallow sedimentary structures associated with the upper Cenozoic Iperk and Shallow Bay depositional sequences. Seismic velocity analyses suggest a remarkably consistent regional velocity-depth trend on the slope within the upper 4 s two-way traveltime. A separate velocity trend was not defined beneath the shelf in this region, where data are influenced by the occurrence of permafrost. Deviations from this trend were noted at unconformities including an upper erosional unconformity.The seismic data in the Mackenzie Trough region suggest a different velocity-depth trend within the upper section and the region is marked by a large erosional unconformity, likely the base of the Shallow Bay sequence. Velocity analyses suggest the removal of up to 425 m of overburden; however, this is an overestimate of erosion as differential compaction from the glacial history has not yet been taken into account. In deeper water (>750 m) a bottom-simulating reflector is present, characterized by the occurrence of free gas and a low-velocity zone.Analyses of three fluid-expulsion features on the slope indicate that the Pokak fluid-expulsion feature and the Triple-Mound fluid-expulsion feature are linked to underlying anticline structures. A flat-topped fluidexpulsion feature at the flank of an equivalent anticline was also examined, but the occurrence of shallow gas creates a blank zone beneath this structure. Pronounced changes in the velocity-depth function at these fluid-expulsion features are linked to occurrence of free gas, and/or fluidized mud extrusions. Résumé :En 2013 et 2014, des données sismiques multicanal ont été acquises sur 1220 km dans la mer de Beaufort afin d'interpréter les structures sédimentaires à faible profondeur associées aux séquences sédimentaires d'Iperk et de Shallow Bay du Cénozoïque supérieur. Des analyses de la vitesse sismique indiquent une tendance vitesse-profondeur remarquablement constante à l'échelle régionale sous le talus pour les quatre premières secondes de temps de trajet double. Dans cette région, nous n'avons pas défini une tendance vitesse-profondeur distincte pour le secteur sous-jacent à la plate-forme continentale, un endroit où les données sont influencées par la présence de pergélisol. Des écarts par rapport à la tendance ont été relevés au niveau de discordances, notamment d'une discordance d'érosion supérieure.Dans la région de la cuvette de Mackenzie, les données sismiques révèlent une tendance vitesseprofondeur différente dans la partie supérieure de la coupe et la région est marquée par la présence d'une importante discordance d'érosion, qui correspond vraisemblablement à la base de la séquence de Shallow Bay. Les analyses de la vitesse laissent croire à la suppression de terrains de couverture sur une épaisseur pouvant atteindre 425 m. Cependant, il s'agit là d'une surestimation de l'importance de l'érosion, étant donné que la compac...

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“…The depth to this unconformity mapped by Batchelor et al (2013a) matches the depth defined in the Adlartok P-09 well ( Fig. 1) (Dixon et al, 1992).…”

Section: Stratigraphic and Structural Settingsupporting

confidence: 60%

Section: Stratigraphic and Structural Settingmentioning

confidence: 99%

First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

Riedel

Hong²,

Jin³

et al. 2016

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show abstract

“…2) (see also Polyak et al, 2007). Rocks of this composition occur at the North American margin, notably in the Mackenzie area and in the north-central part of the Canadian Archipelago (e.g., Dixon et al, 1992;Darby and Bischof, 1996;Phillips and Grantz, 2001), but normally do not make any considerable contribution to IRD in the basin. We infer that these source rocks were subjected to glacial erosion when the northwestern Laurentide limit expanded to the continental margin at low sea level such as during MIS 2.…”

Section: Discussionmentioning

confidence: 96%

Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean

Polyak

Bischof

Ortiz

et al. 2009

Global and Planetary Change

154

144

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“…A drainage system that cut down through the regionally extensive Pliocene sediment cover might have developed in the Early Pleistocene. Fluvio-deltaic to deltaic-shallow-marine depositional environments prevailed along the Canadian Arctic continental margin (Dixon et al 1992;Torsvik et al 2002). Therefore, the Bering and Fram Straits might have been the only Pliocene gateways to the Arctic Ocean.…”

Section: (A ) the Arctic Basin In The Pliocenementioning

confidence: 99%

Pliocene palaeoceanography of the Arctic Ocean and subarctic seas

Matthießen

Knies

Vogt

et al. 2008

Phil. Trans. R. Soc. A.

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The Pliocene is important in the geological evolution of the high northern latitudes. It marks the transition from restricted local-to extensive regional-scale glaciations on the circum-Arctic continents between 3.6 and 2.4 Ma. Since the Arctic Ocean is an almost land-locked basin, tectonic activity and sea-level fluctuations controlled the geometry of ocean gateways and continental drainage systems, and exerted a major influence on the formation of continental ice sheets, the distribution of river run-off, and the circulation and water mass characteristics in the Arctic Ocean. The effect of a water mass exchange restricted to the Bering and Fram Straits on the oceanography is unknown, but modelling experiments suggest that this must have influenced the Atlantic meridional overturning circulation. Cold conditions associated with perennial sea-ice cover might have prevailed in the central Arctic Ocean throughout the Pliocene, whereas colder periods alternated with warmer seasonally ice-free periods in the marginal areas. The most pronounced oceanographic change occurred in the Mid-Pliocene when the circulation through the Bering Strait reversed and low-salinity waters increasingly flowed from the North Pacific into the Arctic Ocean. The excess freshwater supply might have facilitated sea-ice formation and contributed to a decrease in the Atlantic overturning circulation.

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Upper Cretaceous to Pleistocene sequence stratigraphy of the Beaufort-Mackenzie and Banks Island areas, Northwest Canada

Cited by 45 publications

References 0 publications

First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean

Pliocene palaeoceanography of the Arctic Ocean and subarctic seas

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