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Late Quaternary changes in sediment sources in the Labrador Sea

Andrews, John T ; Piper, David J. W

Canadian journal of earth sciences, 2023-02, Vol.60 (2), p.189-213 [Periódico revisado por pares]

Ottawa: National Research Council of Canada

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Título:
Late Quaternary changes in sediment sources in the Labrador Sea
Autor: Andrews, John T ; Piper, David J. W
Assuntos: Arctic region ; Atlantic Ocean ; Bedrock ; Calcite ; Canada ; Canadian Shield ; Carbonate sediments ; Carbonates ; Cenozoic ; Composition ; Continental shelves ; Cores ; Decision trees ; Diffraction patterns ; Dispersal ; Dolomite ; Dolostone ; Earth science ; Eastern Canada ; Environmental aspects ; Facies (Geology) ; glaciation ; Greenland ; Greenland ice sheet ; Holocene ; Isotopes ; Labrador ; Labrador Sea ; Laurentide ice sheet ; lithofacies ; marine environment ; Marine sediments ; Mineral composition ; Minerals ; Newfoundland and Labrador ; North Atlantic ; Oceans ; Outer continental shelf ; paleoenvironment ; Pleistocene ; Precambrian ; provenance ; Quaternary ; Quaternary geology ; Rocks ; Sediment ; Sediment samplers ; Sediment samples ; Sediment sources ; sediment transport ; Sedimentary facies ; Sedimentary rocks ; Sediments ; Sediments (Geology) ; Shale ; spectra ; statistical analysis ; Temporal variations ; Testing ; transport ; upper Pleistocene ; X-ray diffraction ; X-ray diffraction data ; X-ray fluorescence spectra
É parte de: Canadian journal of earth sciences, 2023-02, Vol.60 (2), p.189-213
Descrição: Quaternary sediment in the Labrador Sea was derived from many proglacial sources in Greenland and eastern Canada. Understanding the spatial and temporal changes in sediment provenance provides information on ice extent and sediment dispersal patterns. Variations in mineral composition of sediment from late Quaternary cores has been determined by a whole pattern of quantitative X-ray diffraction procedure. Mineral facies were extracted statistically by a supervised analysis of 90 samples from bedrock and ice-rafted clasts, which were then used to predict the most probable mineral facies in 1443 marine sediment samples. We used a non-parametric Classification Decision Tree (CDT) to validate that decision. Only 26% of the samples were misclassified in the CDT. The six facies identified consisted of four facies reflecting differences in the composition of Canadian and Greenland Precambrian igneous and metamorphic bedrock, a set of samples dominated by high weight percentages of calcite and dolomite (detrital carbonate (DC) and Hudson Strait Heinrich (HS-H) events), and a "shale" facies. We isolated 284 sediments from the HS-H DC facies and determined that they could be divided into four categories based on differences in their mineral proportions. These categories vary geographically, based on non-carbonate sediment supply during these events from Greenland, the Canadian Shield, the Appalachians, and the outer continental shelf. In the Holocene of the Labrador Sea, dolomite is derived from Baffin Bay and abundance of calcite is influenced by both biogenic productivity and dissolution.
Editor: Ottawa: National Research Council of Canada
Idioma: Inglês

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Late Quaternary changes in sediment sources in the Labrador Sea

Andrews, John T ; Piper, David J. W

Ottawa: National Research Council of Canada

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