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Spencer, A. M.; Embry, Ashton F.; Gautier, Donald L.; Stoupakova, A.V.; Sørensen, Kai

doi:10.1144/m35

Cited by 9 publications

(11 citation statements)

References 0 publications

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“…Thinned continental crust, characterized by basement and crustal velocities 6.6 km/s, is least sampled in this mapping, but also occurs on three sides of the basin (pink circles, Figure 1): beneath Northwind Ridge, within a large block that extends more than 300 km north of the Alaskan continental margin (CC, Figure 1), and within a buried graben in the northeast Canada Basin (78 N, Figure 1). The CC block of continental crust coincides with the offshore extension of the D3 magnetic domain of Saltus et al (2011).…”

Section: Geologic Frameworkmentioning

confidence: 83%

“…Magnetic domains mapped by Saltus et al (2011) are shown on the magnetic map of Gaina et al (2011) as areas encircled by dashed lines and labeled with letters (B, D, F) and numbers ( Figure 3a). These domains were classified according to magnetic character and interpreted by their magnetic fabric, association with regions classified with different crustal character, and correlation with gravity anomalies.…”

Section: Magnetic Datamentioning

confidence: 99%

“…Just east of Northwind Ridge, a high-amplitude positive magnetic anomaly here called the Northwind Ridge Magnetic Anomaly (NoRMA, Figure 3a) exists. The northern-most part of NoRMA is included as part of the Alpha-Mendeleev HALIP in the F1 domain of Saltus et al (2011) (Figure 3a), but is excluded in the HALIP polygon proposed by Oakey and Saltus, (2016). NoRMA parallels Northwind Escarpment southward with discontinuous, lower amplitude segments, and may even continue southwestward onto the Chukchi Shelf ( Figure 3a).…”

Section: Northwind Escarpmentmentioning

confidence: 99%

“…Helwig et al (2011) include Sever Spur as part of the rifted North American margin in their schematic prerift reconstruction of Canada Basin. The Sever Spur ridges occur at the edge of the area mapped as HALIP (Figure 3a) (Oakey & Saltus, 2016;Saltus et al, 2011). Proximity of Sever Spur to the HALIP also complicates interpretations of stratigraphy and basement because of possible magmatic-related intrusion, extrusion, or deformation.…”

Section: Sever Spurmentioning

confidence: 99%

“…Likewise, the shape of the polygon of oceanic crust suggests that the pole could be northward, in the direction of narrowing of the polygon of oceanic crust. The overprinting of this northern region by HALIP volcanism (Oakey & Saltus, 2016;Saltus et al, 2011), the triangular shape of Canada Basin, and the compelling geologic evidence linking Arctic Alaska to Canada (Gottlieb et al, 2014;Mickey et al, 2002) makes this pole-to-the-north possibility difficult to accept.…”

Section: Future Directionsmentioning

confidence: 99%

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Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean

Hutchinson

Jackson

Houseknecht

et al. 2017

Geochem Geophys Geosyst

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Synthesis of seismic velocity, potential field, and geological data from Canada Basin and its surrounding continental margins suggests that a northeast‐trending structural fabric has influenced the origin, evolution, and current tectonics of the basin. This structural fabric has a crustal origin, based on the persistence of these trends in upward continuation of total magnetic intensity data and vertical derivative analysis of free‐air gravity data. Three subparallel northeast‐trending features are described. Northwind Escarpment, bounding the east side of the Chukchi Borderland, extends ∼600 km and separates continental crust of Northwind Ridge from high‐velocity transitional crust in Canada Basin. A second, shorter northeast‐trending zone extends ∼300 km in northern Canada Basin and separates inferred continental crust of Sever Spur from magmatically intruded crust of the High Arctic Large Igneous Province. A third northeast‐trending feature, here called the Alaska‐Prince Patrick magnetic lineament (APPL) is inferred from magnetic data and its larger regional geologic setting. Analysis of these three features suggests strike slip or transtensional deformation played a role in the opening of Canada Basin. These features can be explained by initial Jurassic‐Early Cretaceous strike slip deformation (phase 1) followed in the Early Cretaceous (∼134 to ∼124 Ma) by rotation of Arctic Alaska with seafloor spreading orthogonal to the fossil spreading axis preserved in the central Canada Basin (phase 2). In this model, the Chukchi Borderland is part of Arctic Alaska.

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Section: Geologic Frameworkmentioning

confidence: 83%

Section: Magnetic Datamentioning

confidence: 99%

Section: Northwind Escarpmentmentioning

confidence: 99%

Section: Sever Spurmentioning

confidence: 99%

Section: Future Directionsmentioning

confidence: 99%

See 3 more Smart Citations

Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean

Hutchinson

Jackson

Houseknecht

et al. 2017

Geochem Geophys Geosyst

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References

2021

Iceland Within the Northern Atlantic 1

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Canada’s maritime frontier: the science legacy of Canada’s extended continental shelf mapping for UNCLOS

et al. 2023

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Canada ratified the United Nations Convention on the Law of the Sea in 2003. With that ratification came an obligation to submit data and information to the United Nations pertaining to the limits of the country’s extended continental shelf; the portion of the juridical continental shelf that extends beyond 200 nautical miles. A team of scientists spent 13 years compiling and acquiring data to provide the scientific evidence to support delineation of Canada’s outermost maritime limits. The submission has the potential to provide Canada with 2.4 million km2 of additional submarine landmass in the Atlantic and the Arctic oceans over which Canada exercises sovereign rights for the purpose of exploring and exploiting its natural resources. Specific information such as the tectonic framework of the continental margin, the geomorphology of the margin, sedimentation on the continental slope, the geologic nature of adjoined ridges, rises, and plateaux, and sediment thickness within adjacent basins are examples of fundamental pieces of geoscientific information needed. This paper highlights a number of segments of Canada’s continental margins to showcase this scientific evidence and how it is applied in the UNCLOS context. In so doing, the paper demonstrates the immensity of new knowledge gained of Canada’s offshore lands.

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Cited by 9 publications

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Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean

Significance of Northeast‐Trending Features in Canada Basin, Arctic Ocean

References

Canada’s maritime frontier: the science legacy of Canada’s extended continental shelf mapping for UNCLOS

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