| Titre | Late Quaternary changes in sediment sources in the Labrador Sea |
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| Auteur | Andrews, J T ;
Piper, D J W |
| Source | Canadian Journal of Earth Sciences vol. 60, 2022 p. 189-213, https://doi.org/10.1139/cjes-2022-0026 |
| Image |  |
| Année | 2022 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20220193 |
| Éditeur | Éditions Sciences Canada |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1139/cjes-2022-0026 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Province | Terre-Neuve-et-Labrador; Territoires du Nord-Ouest |
| SNRC | 26; 16; 25; 15; 24; 14; 23; 13; 3; 22; 12; 2; 21; 11; 1 |
| Région | île de Baffin |
| Lat/Long OENS | -70.0000 -35.0000 70.0000 45.0000 |
| Sujets | sediments; minéraux détritiques; carbonate; carbonates; sédiments marins; dépôts glaciaires; diffraction des rayons x; analyse statistique; Bassin de Baffin Bay ; minéralogie; sédimentologie;
Quaternaire |
| Illustrations | cartes de localisation; tableaux; diagrammes; graphiques; diagrammes à secteurs; graphique à barres |
| Programme | Géosciences marines pour la planification spatiale marine |
| Diffusé | 2022 09 15 |
| Résumé | (disponible en anglais seulement)
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 weremisclassified 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. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Nous présentons le premier ensemble complet de données sur la variation de la composition minérale des sédiments glaciaires et postglaciaires
dans la mer du Labrador. L'analyse statistique de la composition minérale est utilisée pour suivre les changements dans les sources de sédiments et les schémas de dispersion dans le temps. |
| GEOSCAN ID | 330479 |
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