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TitreDeveloping an improved knowledge framework for indicator mineral interpretation
AuteurRussell, H A J; Kjarsgaard, B A; Lesemann, J E; Sharpe, D R
SourceNorthwest Territories Geoscience Office, Yellowknife Geoscience Forum Abstracts Volume .
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150378
ÉditeurNWT geoscience Centre
RéunionNWT Geoscience Forum; Yellowknife; CA
Documentpublication en série
Lang.anglais
Mediapapier
Formatspdf
ProvinceNunavut; Territoires du Nord-Ouest
Lat/Long OENS-121.0000 -100.0000 66.0000 61.0000
Sujetséléments d'indice; interprétations géophysiques; interprétations géochimiques; profils de dispersion; dispersion des sédiments
Illustrationslocation maps; graphs; schematic diagrams
ProgrammeDeveloppements methodologie, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
New methods development is needed to develop an improved framework for IM survey design and interpretation in order to enhance exploration effectiveness. To date, glacial geological mapping has focused mainly on surficial sediments, landform recognition, and evidence of bedrock erosion (e.g. striae) to provide a paleoglaciological context for IM interpretation.
Increasing recognition of the importance of regional erosional events in glacial landscape genesis raises the possibility that, in some settings, sediment transport processes and directions may differ from erosional processes responsible for landform development. Mapped dispersal plumes record sediment transport vectors and they may be examined independently of landforms (and landforming processes) used to reconstruct ice flow directions. Therefore, the proposed approach aims to differentiate sediment production and transport processes from land forming processes. This may better focus attention on the subglacial processes responsible for dispersal plume development.
With a few exceptions, little work has been directed toward understanding the geometry of indicator plumes across a geological region, or for specific ice sheet flow lines. A multi-stepped approach will be used to examine dispersal plume characteristics.
First, dispersal plumes will be mapped at a region ¿ system scale relying on a wealth of legacy IM data (government, industry). Associations of dispersal trains with known IM sources will provide a first-order interpretive framework for dispersal plume patterns and transport distances in a region.
Second, landscape elements such as streamlined landforms, glaciofluvial landforms, and the type and distribution of sediments will be used to refine the local geomorphic and sedimentologic context of dispersal plumes. These data will further constrain plume mapping and allow assessment of complex flow paths, mechanisms and possible palimpsest relationships.
Third, recent advances on understanding of subglacial sediment production, entrainment, and deposition processes will be integrated within the evolving interpretive framework to refine interpretation of dispersal plumes. Lastly, numerical modeling will attempt to quantify the key variables controlling dispersal plume development in various geologic terrains.
Résumé(Résumé en langage clair et simple, non publié)
Nous faisons le point sur le projet portant sur un cadre amélioré pour la conception et l'interprétation de levés de minéraux indicateurs afin d'améliorer l'efficacité de l'exploration. La reconnaissance de l'importance des processus de transport des sédiments incite à accorder plus d'attention aux processus sous-glaciaires responsables de la dispersion des minéraux. Une approche en plusieurs étapes est utilisée pour examiner les caractéristiques de la dispersion.
GEOSCAN ID297486