Geology of the Arctic Archipelago

Thorsteinsson, R; Tozer, E T

doi:10.4095/106153

Cited by 73 publications

(43 citation statements)

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“…The Palaeogene Eurekan deformation affected parts of both the Franklinian Basin and the Sverdrup Basin and led to the formation of a deformation belt that extends from the Canadian Arctic in the west over North Greenland towards Svalbard in the east (e.g., Thorsteinsson & Tozer, 1970;Soper et al, 1982). It was caused by the plate tectonic reorganisation during the simultaneous seafloor spreading in the Northeast Atlantic and Labrador Sea-Baffin Bay between c. 56 and 34 Ma, the related northward motion of the Greenland plate, and the opening of the Eurasia Basin starting c. 56 Ma ago (e.g., Menzies, 1982;Srivastava & Tapscott, 1986;Tessensohn & Piepjohn, 2000;Piepjohn et al, 2013).…”

Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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The poorly studied Alpha-Mendeleev Ridge of the Amerasia Basin of the Arctic Ocean is covered by a large magnetic high and interpreted to be part of the Cretaceous High Arctic Large Igneous Province (HALIP). At the north coast of Ellesmere Island, in the Yelverton Bay area, this characteristic magnetic high overlaps the shelf and the coastal area. Results of aeromagnetic surveys, geological fieldwork, geochronological, geochemical and Sr-Nd isotope analysis were combined to study the tectonic history of this part of the Canadian Polar margin. The basement, consisting of metamorphic rocks of the Pearya Terrane, was strongly affected by HALIP-related magmatism that is responsible for characteristic positive magnetic anomaly patterns. A broad magnetic high that can be traced to the Alpha Ridge covers the shelf and coastal areas of Yelverton Bay. It is caused by a voluminous intrusion into the continental crust at a depth of ca. 6-15 km. A chain of small positive magnetic anomalies crosses Wootton Peninsula from SW to NE and then curves into a NNE-SSW trend. It follows the coastline onshore and offshore and superimposes the southern and eastern margins of the broad magnetic high. On land, the anomaly chain covers fault-bounded outcrops of the Wootton Intrusive Complex (WIC) and the Hansen Point Volcanic Complex (HPVC), indicating that the entire anomaly chain is associated with a volcanogenic sequence. Rhyodacite that forms large parts of the HPVC east and west of Yelverton Bay extruded between c. 104 and 97 Ma (LA-ICP-MS U-Pb zircon ages). It originates from a tholeiitc suite and is probably genetically related to the deep intrusion. The HPVC together with the rhyodacite has an age range of c. 104-74 Ma and includes the mildly alkaline WIC (93-92 Ma). The northern coast of Ellesmere Island shows some characteristic features of a magma-rich rifted margin indicating an extensional evolution parallel to the North American margin between the openings of the Canada Basin and the Eurasian Basin.

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Section: Geological Overview Of the Northeast Canadian Arcticmentioning

confidence: 99%

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Estrada¹,

Damaske²,

Henjes‐Kunst³

et al. 2016

NJG

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“…The Arctic Platform comprises a thick sequence of Proterozoic to Paleogene sedimentary rocks that have not been folded or thrust-faulted on a regional scale (Thorsteinsson and Tozer 1970;Douglas 1970). Although Proterozoic to Cenozoic sedimentary rocks of the Arctic Platform are exposed on Devon Island, the preserved sedimentary succession is incomplete (Figs.…”

Section: Arctic Platformmentioning

confidence: 99%

Geological overview and cratering model for the Haughton impact structure, Devon Island, Canadian High Arctic

Osinski

Lee

Spray

et al. 2005

Meteoritics &Amp; Planetary Science

150

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Abstract-The Haughton impact structure has been the focus of systematic, multi-disciplinary field and laboratory research activities over the past several years. Regional geological mapping has refined the sedimentary target stratigraphy and constrained the thickness of the sedimentary sequence at the time of impact to ∼1880 m. New 40 Ar-39 Ar dates place the impact event at ∼39 Ma, in the late Eocene. Haughton has an apparent crater diameter of ∼23 km, with an estimated rim (final crater) diameter of ∼16 km. The structure lacks a central topographic peak or peak ring, which is unusual for craters of this size. Geological mapping and sampling reveals that a series of different impactites are present at Haughton. The volumetrically dominant crater-fill impact melt breccias contain a calciteanhydrite-silicate glass groundmass, all of which have been shown to represent impact-generated melt phases. These impactites are, therefore, stratigraphically and genetically equivalent to coherent impact melt rocks present in craters developed in crystalline targets. The crater-fill impactites provided a heat source that drove a post-impact hydrothermal system. During this time, Haughton would have represented a transient, warm, wet microbial oasis. A subsequent episode of erosion, during which time substantial amounts of impactites were removed, was followed by the deposition of intra-crater lacustrine sediments of the Haughton Formation during the Miocene. Present-day intracrater lakes and ponds preserve a detailed paleoenvironmental record dating back to the last glaciation in the High Arctic. Modern modification of the landscape is dominated by seasonal regional glacial and niveal melting, and local periglacial processes. The impact processing of target materials improved the opportunities for colonization and has provided several present-day habitats suitable for microbial life that otherwise do not exist in the surrounding terrain.

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“…The regional geology of the Arctic Archipelago has been described by Thorsteinsson and Tozer (1970). The major geological provinces as defined by them are the Arctic PlatDownloaded by [Monash University Library] at 07:51 26 November 2014 form, the Boothia Uplift, the Franklinian Geosyncline, the Sverdmp Basin, the Prince Patrick Uplift, and the Arctic Coastal Plain (Fig.…”

Section: Introduction and Previous Workmentioning

confidence: 99%

Thermal Maturity and Source-Rock Potential in Northwestern Melville Island, Arctic Canada

Gentzis¹,

Goodarzi

1992

Energy Sources

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Approximately 130 core and drillhole cuttings samples taken from the Palaeozoic and Mesozoic of nonhwestern Melville Island were examined using reflected-light microscopy and Rock-Eva1 pyrolysis. The Triassic Schei Point marine silty shales, known to be good-quality source rocks in cenain pans of the Sverdrup Basin, are dominated by kerogen Types I and I!, have hydrogen index (HI) values as high as 625 mg hydrocarbon (HC)/g organic carbon, a total organic carbon (TOC)content as high as 8.0%, but are marginally mature at best. Source potential de-

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Geology of the Arctic Archipelago

Cited by 73 publications

References 0 publications

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data

Geological overview and cratering model for the Haughton impact structure, Devon Island, Canadian High Arctic

Thermal Maturity and Source-Rock Potential in Northwestern Melville Island, Arctic Canada

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