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TitleThe variability of Baffin Bay seafloor sediment mineralogy: the identification of discrete glacial sediment sources and application to Late Quaternary downcore analysis
AuthorAndrews, J T; Klein, A J; Jenner, K A; Jennings, A E; Campbell, D CORCID logo
SourceCanadian Journal of Earth Sciences vol. 55, no. 6, 2018 p. 620-639, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20170353
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northern offshore region
NTS16; 26; 27; 28; 29; 36; 37; 38; 39; 120; 340
AreaBaffin Bay; Davis Strait; Baffin Island; Nares Strait; Cumberland Peninsula; Home Bay; Lancaster Sound; Disko Island; Canada; Denmark; Greenland
Lat/Long WENS -80.0000 -50.0000 83.0000 65.0000
Subjectsmarine geology; surficial geology/geomorphology; mineralogy; marine sediments; glacial deposits; alluvial deposits; clasts; provenance; source areas; source rocks; sediment dispersal; dispersal patterns; sediment transport; x-ray diffraction analyses; core samples; lake sediments; stream sediment samples; mineral assemblages; bedrock geology; lithology; sedimentary rocks; carbonates; shales; igneous rocks; volcanic rocks; basalts; grain size analyses; glacial history; ice flow; glaciers; continental margins; continental shelf; continental slope; oceanography; current circulation; sea ice; weathering; Archean; Foxe Fold Belt; Baffin Shelf; Baffin Slope; West Greenland Shelf; West Greenland Slope; Baffin Island Home Bay Ice Stream; Baffin Current; West Greenland Current; Kane Basin; Melville Bugt; Uummannaq Trough; Disko Trough; ice-flow directions; ice streams; Phanerozoic; Cenozoic; Quaternary; Mesozoic; Cretaceous; Paleozoic; Ordovician; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; schematic cross-sections; flow diagrams; tables; pie charts; models; plots; profiles; lithologic sections
ProgramPublic Safety Geoscience Marine Geohazards
Released2018 03 26
AbstractQuantitative X-ray diffraction (qXRD) mineralogy of bedrock, ice-rafted, and fluvial clasts, 239 seafloor samples (<2 mm), and samples from two long piston cores were used to (i) define regional patterns and sources within Baffin Bay, (ii) evaluate two areas from west Greenland and east Baffin Island in more detail, and (iii) apply these findings to the interpretation of downcore variations in sediment sources. A sediment-unmixing program is used to define surface regional mineral assemblages and to examine changes in sediment sources in cores HU2013029-77PC (southern Baffin Island slope) and HU2008029-8PC (Davis Strait) during Marine Isotope Stages 1 through 3. Distinct regional patterns are observed in the association between the mineralogy of surface sediments and carbonate and basalt bedrock outcrops. Detailed analysis of seafloor samples from the west Greenland troughs and Baffin Island fjords show regional differences in mineralogy, with sediments derived from the Foxe Fold Belt (north-central Baffin Island) being mineralogically distinct from sediments to the north and south. Grain-size spectra from the west Greenland troughs suggested an association between grain-size spectra and mineral assemblages. Sediment unmixing of qXRD data from the two piston cores shows discrete intervals where one or more mineral sources were dominant. However, chronological control is such that it is unclear whether the various ice streams draining into Baffin Bay behaved synchronously.
Summary(Plain Language Summary, not published)
Quantitative X-ray diffraction(qXRD)of 72 bedrock/stream samples and 239 seafloor samples from Baffin Bay shows discrete regional variations associated with provenance inputs implying that various ice streams and outlet glaciers surrounding Baffin Bay contributed sediments into the Bay at specific intervals.

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