Geology, tectonic assemblage map of Grise Fiord, eastern Devon and southern Ellesmere islands, Nunavut

Harrison, J C; Thorsteinsson, R; Frisch, Thomas; Mayr, U; Gilbert, Caroline; Lynds, T; Ford, A

doi:10.4095/296222

Cited by 3 publications

(3 citation statements)

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“…By comparison, Grise Fiord is a long, narrow fjord extending ∼38 km inland, with no glaciers reaching its shore. Geologically, the glacierized sites of Sydkap and Jakeman Glaciers and the non‐glacierized site of Grise Fiord are all surrounded by Cambrian, Ordovician, and Silurian dolomites, limestones, sandstones, and gypsum (Harrison et al., 2015). The non‐glacierized site near the Truelove lowlands, as well as the glacierized sites of the Sverdrup and Belcher Glaciers, are all underlain by Canadian Shield granite, gneiss, and quartzite (Harrison et al., 2015).…”

Section: Study Sitementioning

confidence: 99%

Glaciers and Nutrients in the Canadian Arctic Archipelago Marine System

Bhatia

Waterman

Burgess

et al. 2021

Global Biogeochemical Cycles

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Delivery of meltwater and materials from glaciers to the ocean is accelerating due to climate warming, with important and poorly characterized consequences for the marine environment. While the contributions of these shrinking ice masses to sea level rise are undisputed, their role in marine biogeochemical processes is just beginning to be revealed. Recent studies have shown that glacial meltwater discharge

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Section: Study Sitementioning

confidence: 99%

Glaciers and Nutrients in the Canadian Arctic Archipelago Marine System

Bhatia

Waterman

Burgess

et al. 2021

Global Biogeochemical Cycles

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“…At this time Greenland collided with Ellesmere Island, producing the Stolz/Lake Hazen, Vesle Fiord/East Cape, and Parrish Glacier thrusts [ De Paor et al , ]. Other notable compressional events during phase 2 include ~15 km of east to west shortening of Axel Heiberg Island [ Harrison and Jackson , ; Harrison et al , ] and a 35 km [ Harrison , ] to 40 km [ Balkwill , ] shortening of the central Sverdrup Basin.…”

Section: Regional Geologymentioning

confidence: 99%

A reconstruction of the Eurekan Orogeny incorporating deformation constraints

2017

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The Eurekan Orogeny records Paleogene convergence between Greenland and the Canadian Arctic. The complexity of the region, well represented by the disputed magnitude of Cenozoic sinistral displacement of Greenland relative to Ellesmere Island, stems from the simultaneous evolution of multiple tectonic regimes, as well as overprinting of later tectonic activity. Presented here is a plate model of regional crustal deformation constructed with the interactive GPlates software that enables an evaluation of previous reconstructions of the Eurekan Orogeny. This model is built upon a synthesis of published geological and geophysical data and their interpretations. It incorporates two phases of deformation from ~63 to 35 Ma. Phase 1, ~63 to ~55 Ma, involves ~85 km of Paleocene extension between Ellesmere and Devon Island, extension of ~20 km between Axel Heiberg and Ellesmere Island, and ~85 km of sinistral strike slip along the Nares Strait/Judge Daly Fault System, matching a range of 50–100 km indicated by the offset of marker beds, facies contacts, and platform margins between the conjugate Greenland and Ellesmere Island margins. Phase 2, ~55 to 35 Ma, results in total east‐west compression of ~30 km and ~200 km of north‐south compression across Ellesmere Island. This model confirms, for the first time, that key observations from subregions deformed by the Eurekan Orogeny are compatible on a broad scale. We have also identified potential problem areas in southwestern Ellesmere Island that are less compatible with a best fit model, given current constraints. This deforming plate model offers a platform and base model for future research.

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“…Bedrock geology simplified from Scott & de Kemp () and Harrison et al . (, b, c). [Colour figure can be viewed at www.boreas.dk]…”

Section: Regional Settingmentioning

confidence: 99%

Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Furze

Pieńkowski

McNeely

et al. 2017

Boreas

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Core 2011804-0010 from easternmost Lancaster Sound provides important insights into deglacial timing and style at the marine margin of the NE Laurentide Ice Sheet (LIS). Spanning 13.2-11.0 cal. ka BP and investigated for ice-rafted debris (IRD), foraminifera, biogenic silica and total organic carbon, the stratigraphy comprises a lithofacies progression from proximal grounding line and sub-ice shelf environments to open glaciomarine deposition; a sequence similar to deposits from Antarctic ice shelves. These results are the first marine evidence of a former ice shelf in the eastern Northwest Passage and are consistent with a preceding phase of ice streaming in eastern Lancaster Sound. Initial glacial float-off and retreat occurred >13.2 cal. ka BP, followed by formation of an extensive deglacial ice shelf during the Younger Dryas, which acted to stabilize the retreating margin of the NE LIS until 12.5 cal. ka BP. IRD analyses of sub-ice shelf facies indicate initial high input from source areas on northern Baffin Island delivered to Lancaster Sound by a tributary ice stream in Admiralty Inlet. After ice shelf break-up, Bylot Island became the dominant source area. Foraminifera are dominated by characteristic ice-proximal glaciomarine benthics (Cassidulina reniforme, Elphidium excavatum f. clavata), complemented by advected Atlantic water (Cassidulina neoteretis, Neogloboquadrina pachyderma) and enhanced current indicators (Lobatula lobatula). The biostratigraphy further supports the ice shelf model, with advection of sparse faunas beneath the ice shelf, followed by increased productivity underopen water glaciomarine conditions. The absence of Holocene sediments in the core suggests that the uppermost deposits were removed, most likely due to mass transport resulting from the site's proximity to modern tidewater glacier margins. Collectively, this study presents important new constraints on the deglacial behaviour of the NE Laurentide Ice Sheet, with implications for past ice sheet stability, ice-rafted sediment delivery, and iceÀocean interactions in this complex archipelago setting.

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Geology, tectonic assemblage map of Grise Fiord, eastern Devon and southern Ellesmere islands, Nunavut

Cited by 3 publications

References 0 publications

Glaciers and Nutrients in the Canadian Arctic Archipelago Marine System

Glaciers and Nutrients in the Canadian Arctic Archipelago Marine System

A reconstruction of the Eurekan Orogeny incorporating deformation constraints

Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

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