Comment on “A new model for the Paleogene motion of Greenland relative to North America: Plate reconstructions of the Davis Strait and Nares Strait regions between Canada and Greenland” by G. N. Oakey and J. A. Chalmers

Denyszyn, Steven W.; Halls, H. C.

doi:10.1002/2013jb010323

Cited by 2 publications

(6 citation statements)

References 15 publications

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“…The details in northern Baffin Bay during the Paleocene are less clear. However, as we have shown, the discussion in Denyszyn and Halls [] about possible strike‐slip movements in the Kane Basin area is, therefore, restricted to the motion of Greenland relative to North America during the Paleocene.…”

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 95%

“…Denyszyn and Halls [] argue that the predictions of Oakey and Chalmers [] are inconsistent with the details of Franklinian dykes in the area around Jones Sound and suggest that a solution involving movement of Greenland relative to an Ellesmerian Plate through Nares Strait would be better. Denyszyn and Halls [] do not, however, seem to appreciate that any discussion of the plate kinematic movements in this area need to be discussed separately for the Paleocene and Eocene movements.…”

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

“…Denyszyn and Halls [] argue that distribution of Franklinian dykes around Jones Sound argues against the presence of a major strike‐slip fault there. As Oakey and Chalmers [] commented, “The Jones Sound basin is poorly understood, having limited geophysical mapping [ MacLean et al ., ].” Our conjectured strike‐slip fault there seemed to us the most reasonable solution to the problem of accommodating more than 100 km of relative movement between the Eurekan Fold Belt in the north and the Lancaster Sound Basin in the south.…”

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

“…Gravity inversion of the Lancaster Sound Basin [ Oakey and Stephenson , ] showed that it extended by no more than 40 km, so the relative movement cannot be taken up there. As Denyszyn and Halls [] comment, a major plate boundary cannot readily be placed anywhere on Ellesmere Island south of the Eurekan Fold Belt. So if you reject the hypothesis of a major strike‐slip fault in Jones Sound, where do you accommodate the >100 km of relative movement between Greenland (that must have included the Pre‐Cambrian block of SE Ellesmere Island during the Eocene) and Baffin Island?…”

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

“…Denyszyn and Halls [] argue that Oakey and Chalmers ' [] suggestions for the movements of the Greenland Plate relative to the North American Plate (and a putative “Ellesmerian” Plate) during the Paleogene are incompatible with observations of Franklinian dykes in the area around Nares Strait, Ellesmere Island, and Devon Island in the Canadian Arctic. Denyszyn and Halls [] also argue that Oakey and Chalmers [] plate kinematic model is similar to one published by Denyszyn et al . [] who also argued that Ellesmere Island moved relative to both Greenland and North America during the Paleogene.…”

Section: Introductionmentioning

confidence: 99%

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Reply to comment by Denyszyn and Halls (this volume) on “Geological and geophysical observations in the Kane Basin preclude the presence of a major plate boundary in southwestern Nares Strait”

Oakey

Chalmers

2014

JGR Solid Earth

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The Paleogene movement of the Greenland Plate relative to North America took place in two stages. The movement of the Eocene stage is highly constrained by the known geometry of magnetic lineations and fracture zones in Labrador Sea and Baffin Bay. This geometry requires that the link from Baffin Bay to the Eurekan Orogeny must have been distributed deformation in the Canadian Archipelago, effectively forming an "Ellesmerian" microplate. Geophysical/geological observation in southwestern Nares Strait means that the strike-slip movement of Greenland relative to North America during the Paleocene cannot have been through the Kane Basin but must have taken place farther northwest, probably within the Eurekan Fold Belt.

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Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 95%

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

Section: Geological Models In the Nares Strait Ellesmere Island Devmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reply to comment by Denyszyn and Halls (this volume) on “Geological and geophysical observations in the Kane Basin preclude the presence of a major plate boundary in southwestern Nares Strait”

Oakey

Chalmers

2014

JGR Solid Earth

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Structural evidence for sinistral displacement on the Wegener Fault in southern Nares Strait, Arctic Canada

Gosen¹,

Piepjohn²,

Gilotti³

et al. 2019

Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links With Adjacent Orogens

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The sinistral Wegener Fault in the Nares Strait between northwest Greenland and eastern Ellesmere Island (Canadian Arctic) represents a tectonic element in the Arctic whose existence and significance have been controversial for more than 50 years. Some workers interpret the Wegener Fault as an important early Tertiary transform related to movement of the Greenland plate relative to the North American plate. Others view it as insignificant or reject its existence. While onshore studies in the Canadian portion of the northern Nares Strait region have proven the existence of important sinistral strike-slip faults related to the offshore Wegener Fault, the southern continuation of the Wegener Fault in the southern Kane Basin and Smith Sound is unclear. In particular, Smith Sound has been interpreted as a location of an undisturbed continuation of the Proterozoic basement from Greenland to Ellesmere Island, with only one possible location of the Wegener Fault near the east coast of Ellesmere Island. Our structural studies along the west coast of Smith Sound and adjacent areas of eastern Ellesmere Island suggest a three-phase tectonic evolution. Phase 1 is a brittle deformation (strike-slip faults, partly as conjugate sets) that took place under ~NW–SE shortening. It also occurs at the Smith Sound coast and did not affect the Paleogene deposits. Structures of this phase are assigned to the Paleocene and can be related to the Wegener Fault in the offshore area of Smith Sound just east of the eastern coast of Ellesmere Island. Deposition of thick conglomerates of the Paleocene Cape Lawrence Formation and relatively younger clastic sediments of the Eureka Sound Group (Paleocene–?Eocene) is interpreted to be related to local depocenters associated with the sinistral Wegener Fault. Following uplift and subsidence during normal faulting associated with Phase 2 deformation, younger contractional deformation under ~NE–SW shortening (strike-slip faults, partly as conjugate sets) of Phase 3 deformation also affected the Paleogene deposits. Phases 2 and 3 can both be assigned to the Eocene. Our interpretation points to a polyphase deformational history in the early Paleogene, which partly interfered with deposition of Paleogene clastic sediments. The first deformational phase in the Paleocene is related to the sinistral Wegener Fault, which, in the offshore areas, is not interpreted as a distinct through-going plane but as displaced by ~W–E striking faults. Therefore, our observation and interpretation support the existence of this fault in the southern Nares Strait region, east of the Ellesmere Island coast in Smith Sound.

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Comment on “A new model for the Paleogene motion of Greenland relative to North America: Plate reconstructions of the Davis Strait and Nares Strait regions between Canada and Greenland” by G. N. Oakey and J. A. Chalmers

Cited by 2 publications

References 15 publications

Reply to comment by Denyszyn and Halls (this volume) on “Geological and geophysical observations in the Kane Basin preclude the presence of a major plate boundary in southwestern Nares Strait”

Reply to comment by Denyszyn and Halls (this volume) on “Geological and geophysical observations in the Kane Basin preclude the presence of a major plate boundary in southwestern Nares Strait”

Structural evidence for sinistral displacement on the Wegener Fault in southern Nares Strait, Arctic Canada

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