Geological map of the Arctic

Harrison, J C; St-Onge, M R; Петров, О. В.; Strelnikov, S I; Lopatin, B. G.; Wilson, Frederic H. Digital Files Preparation:; Tella, S; Paul, D; Lynds, T; Shokalsky, Sergey; Hults, Chad; Bergman, Stefan; Jepsen, H.F; Solli, Arne

doi:10.4095/287868

Cited by 49 publications

(29 citation statements)

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“…Of these, G, H, and I were geologically distinct, with G underlain by conglomerate and H and I by sandstone, while all other sites were situated on carbonate bedrock (Harrison et al. ). Site G was of typical size (i.e., 1.95 ha; median = 2.25 ha), but was notable for having the highest elevation and lowest specific conductivity of all sites (i.e., 40 μS · cm −1 ), as well as for being the only site situated on pre‐Quaternary consolidated surface deposits (Dyke and Green ).…”

Section: Resultsmentioning

confidence: 99%

“…POWI is underlain largely by Cambrian to Devonian carbonate bedrock, with a NW‐SE trending band of Silurian to Devonian sandstones and conglomerates that underlay roughly 15% of the island, and a fringe of Archean to Proterozoic gneiss and diabase is present along parts of the east coast (Harrison et al. ). While there are no climate stations on POWI, three climate stations are situated within 500 km: Resolute Bay (74°43′ 01″ N, 94°58′ 10″ W, ~250 NNE), Cambridge Bay (69°06′ 29″ N, 105°08′ 18″ W, ~460 km SW), and Nanisivik (72°59′ 00″ N, 84°37′ 00″ W, ~470 km E).…”

Section: Site Descriptionmentioning

confidence: 99%

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Determining diatom ecotones and their relationship to terrestrial ecoregion designations in the central Canadian Arctic Islands

Antoniades

Douglas

Michelutti

et al. 2014

Journal of Phycology

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Ecotones are key areas for the detection of global change because many are predicted to move with shifts in climate. Prince of Wales Island, in the Canadian Arctic Archipelago, spans the transition between mid- to high-Arctic ecoregions. We analyzed limnological variables and recent diatom assemblages from its lakes and ponds to determine if assemblages reflected this ecotone. Limnological gradients were short, and water chemistry explained 20.0% of diatom variance in a redundancy analysis (RDA), driven primarily by dissolved organic carbon, Ca and SO4 . Most taxa were small, benthic forms; key taxa such as planktonic Cyclotella species were restricted to the warmer, southern portion of the study area, while benthic Staurosirella were associated with larger, ice-dominated lakes. Nonetheless, there were no significant changes in diatom assemblages across the mid- to high-Arctic ecoregion boundary. We combined our data set with one from nearby Cornwallis Island to expand the study area and lengthen its environmental gradients. Within this expanded data set, 40.6% of the diatom variance was explained by a combination of water chemistry and geographic variables, and significant relationships were revealed between diatom distributions and key limnological variables, including pH, specific conductivity, and chl-a. Using principal coordinates analysis, we estimated community turnover with latitude and applied piecewise linear regression to determine diatom ecotone positions. A pronounced transition was present between Prince of Wales Island and the colder, more northerly Cornwallis Island. These data will be important in detecting any future northward ecotone movement in response to predicted Arctic climate warming in this highly sensitive region.

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Section: Resultsmentioning

confidence: 99%

Section: Site Descriptionmentioning

confidence: 99%

Determining diatom ecotones and their relationship to terrestrial ecoregion designations in the central Canadian Arctic Islands

Antoniades

Douglas

Michelutti

et al. 2014

Journal of Phycology

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“…Given that rivers draining carbonate bedrock are expected to have higher solute loads compared to those draining silicate bedrock [ Gaillardet et al ., ], it is important to quantify the fraction of carbonate rock exposed in the studied watersheds (see next section) and other Arctic watersheds more generally. To this end, we used two geologic maps [ Wheeler et al ., ; Harrison et al ., ] to reclassify mapped geologic units as sourcing (1) dominantly carbonate/evaporite units (C*), (2) major carbonate units (C), (3) minor carbonate units (Cm), and (4) other units (Figure inset; see Text S1 in the supporting information for a detailed description of the reclassification). Because even a relatively small amount of calcite can dominate river water chemistry [e.g., Jacobson and Blum , ], we used the simplified geology to quantify the fraction of area where significant amounts of carbonate are present.…”

Section: Methodsmentioning

confidence: 99%

On the geochemical heterogeneity of rivers draining into the straits and channels of the Canadian Arctic Archipelago

et al. 2017

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Ten rivers across northern Canada and the Canadian Arctic Archipelago (CAA) were sampled during spring 2014 and summer 2015 to investigate their geochemical heterogeneity for comparison against larger North American (i.e., Mackenzie and Yukon Rivers) and Siberian rivers. In general, rivers draining the western and/or northern regions of the study area have higher solute concentrations and lower 87Sr/86Sr ratios compared to rivers draining the eastern and/or southern regions. The inorganic geochemical signatures largely reflect the bedrock geology, which is predominately carbonate in the western and/or northern regions and silicate in the eastern and/or southern regions. Riverine δ18O values primarily correlate with latitude, with only a few exceptions. Measurements of total alkalinity (TA) were combined with a regional analysis of bedrock geology and extrapolated to produce a range for the mean characteristic TA of rivers draining into the straits and channels of the CAA (628–819 µeq kg−1). Combining this estimate with contributions from the Mackenzie River yields a revised North American river runoff TA of 935–1182 µeq kg−1, which is much lower than that of the Mackenzie River (1540 µeq kg−1). This lower concentration suggests that TA may not be used to distinguish between North American and Siberian river contributions in regions such as Davis Strait.

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“…Paleocene rifting resulted in basaltic flows observed on the Greenland Precambrian Shield margins near the Disko Island and Uummannaq fjord regions (see Fig. for a geological overview, and Harrison et al ., , for a detailed geological map of the area). Baffin Bay is bounded to the north by Nares Strait, a probable transform fault, and to the south by the Ungava transform fault system underlying Davis Strait (Ehrhardt et al ., ).…”

Section: Regional Settingmentioning

confidence: 97%

“…The bathymetry, oceanic circulation and simplified bedrock geology are from www.geus.dk, Harrison et al . () and Tang et al . ().…”

Section: Introductionmentioning

confidence: 97%

North‐eastern Laurentide, western Greenland and southern Innuitian ice stream dynamics during the last glacial cycle

Simon

Hillaire‐Marcel

St‐Onge

et al. 2013

J Quaternary Science

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Precise relationships between high‐frequency ice sheet dynamics and late Quaternary climate variability are still poorly understood, notably with regard to their relative timing and causal mechanisms. Baffin Bay is of particular interest in this regard due to the influence of ice streaming activities from the north‐eastern Laurentide, southern Innuitian and western Greenland ice margins on its sedimentary regimes during glacial times. Here we document such ice margin dynamics using a sedimentological analysis performed on a piston core from central Baffin Bay and spanning the last 115 ka. Lithofacies analysis and mineralogical assemblages are used to reconstruct sediment sources (using the SedUnMix program) and depositional mechanisms. Coarse detrital carbonate (DC, dolomite‐rich) layers are attributed either to north‐eastern Laurentide and Innuitian ice stream surges or to pervasive ice rafted debris delivery processes at distinct periods. Out‐of‐phase fine‐grained glaciomarine sediments with a mineralogical signature from western Greenland, linked to Uummannaq ice streaming activity, are interbedded with the coarse DC layers. The new results suggest that during the last glacial cycle, the north‐eastern Laurentide and southern Innuitian ice streams were sensitive to high‐frequency climate fluctuations, such as the Dansgaard–Oeschger events, while the western Greenland margins were more sensitive to large‐scale climatic/oceanic reorganizations, such as relative sea‐level changes and/or advection of warmer Atlantic waters into the bay.

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Geological map of the Arctic

Cited by 49 publications

References 0 publications

Determining diatom ecotones and their relationship to terrestrial ecoregion designations in the central Canadian Arctic Islands

Determining diatom ecotones and their relationship to terrestrial ecoregion designations in the central Canadian Arctic Islands

On the geochemical heterogeneity of rivers draining into the straits and channels of the Canadian Arctic Archipelago

North‐eastern Laurentide, western Greenland and southern Innuitian ice stream dynamics during the last glacial cycle

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