GEOSCAN Search Results: Fastlink


TitleHeat flow in the western Arctic Ocean (Amerasian Basin)
AuthorRuppel, C D; Lachenbruch, A H; Hutchinson, D R; Munroe, R J; Mosher, D C
SourceJournal of Geophysical Research, Solid Earth vol. 124, 2019 p. 1-26, (Open Access)
Alt SeriesNatural Resources Canada, Contribution Series 20190159
PublisherAmerican Geophysical Union (AGU)
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
ProvinceNunavut; Northern offshore region
AreaArctic Ocean
Lat/Long WENS 165.0000 -150.0000 90.0000 69.0000
Subjectsmarine geology; surficial geology/geomorphology; geophysics; Science and Technology; oceanography; marine sediments; turbidites; contourites; landslide deposits; heat flow; thermal gradients; thermal conductivity; heat conduction; radiogenic heat; bathymetry; geophysical surveys; seismic surveys, marine; bedrock geology; basement geology; lithology; igneous rocks; volcanic rocks; volcaniclastics; structural features; faults; submarine features; submarine ridges; sedimentary basins; oceanic crust; continental crust; mantle; continental margins; continental slope; water circulation patterns; modelling; overburden thickness; Amerasian Basin; Alpha-Mendeleev Ridge; Alpha Ridge; Mendeleev Ridge; Canada Basin; Nautilus Basin; High Arctic Large Igneous Province (HALIP); Chukchi Plateau; Northwind Ridge; Mendeleev Plain; mass transport deposits; hemipelagic sediment; colluvial and mass-wasting deposits
Illustrationslocation maps; geoscientific sketch maps; photographs; tables; plots; bar graphs; seismic profiles; profiles
ProgramGSC - Atlantic and Western Canada Branch, United Nations Convention on the Law of the Sea
Released2019 07 10
AbstractFrom 1963 to 1973 the U.S. Geological Survey measured heat flow at 356 sites in the Amerasian Basin (Western Arctic Ocean) from a drifting ice island (T-3). The resulting measurements, which are unevenly distributed on Alpha-Mendeleev Ridge and in Canada and Nautilus Basins, greatly expand available heat flow data for the Arctic Ocean. Average T-3 heat flow is ~54.7 ± 11.3 mW/m2, and Nautilus Basin is the only well?surveyed area (~13% of data) with significantly higher average heat flow (63.8 mW/m2). Heat flow and bathymetry are not correlated at a large scale, and turbiditic surficial sediments (Canada and Nautilus Basins) have higher heat flow than the sediments that blanket the Alpha-Mendeleev Ridge. Thermal gradients are mostly near-linear, implying that conductive heat transport dominates and that near-seafloor sediments are in thermal equilibrium with overlying bottom waters. Combining the heat flow data with modern seismic imagery suggests that some of the observed heat flow variability may be explained by local changes in lithology or the presence of basement faults that channel circulating seawater. A numerical model that incorporates thermal conductivity variations along a profile from Canada Basin (thick sediment on mostly oceanic crust) to Alpha Ridge (thin sediment over thick magmatic units associated with the High Arctic Large Igneous Province) predicts heat flow slightly lower than that observed on Alpha Ridge. This, along with other observations, implies that circulating fluids modulate conductive heat flow and contribute to high variability in the T-3 data set.