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TitleDispersal trains in eskers
AuthorCummings, D I; Russell, H A JORCID logo; Sharpe, D RORCID logo
SourceProceedings of the GAC - MAC - SEG - SGA Join Annual Meeting, 2011; Geological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume 2011. Open
Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20100443
PublisherGeological Association of Canada
MeetingGAC/MAC/SEG/SGA annual meeting; Ottawa; CA; May 25-27, 2011
Mediapaper; on-line; digital
File formatPDF
AreaKeewatin area; Canada
Subjectseconomic geology; general geology; surficial geology/geomorphology; eskers; drift deposits; drift prospecting; indicator elements; tills; sediment dispersal; mineral exploration
ProgramGEM: Geo-mapping for Energy and Minerals Diamonds
Released2011 01 01
AbstractEskers are commonly sampled for indicator minerals during drift prospecting campaigns on the Precambrian Shield. Esker sampling is a proven method: it has led to the discovery of several kimberlites, including the Lac de Gras kimberlite field, home to Canada's first diamond mine. Although commonly associated with diamond exploration, it can be used to locate any mineral deposit type that yields a characteristic suite of indicator minerals (e.g., Ni-Cu-PGE deposits). However, a literature review reveals that indicator-mineral dispersal in esker sedimentary systems is a poorly understood phenomenon. Beyond basic concepts established almost a century ago 'most eskers are derived from till and contain dispersal trains that extend roughly parallel to those in the till' exploration companies lacking their own proprietary knowledge are left with little basis for understanding how to sample eskers or interpret esker data. What parts of eskers should be targeted when sampling for indicator minerals? How long are indicator-mineral dispersal trains in eskers, typically? Tens of meters? Tens of kilometers? Hundreds of kilometers? What about pebble dispersal trains? Are they typically shorter? Based on the literature review and on recently collected data from the Keewatin, and drawing insights from a broader body of literature on modern glaciers, lab experiments, and gravel-bed streams, a preliminary conceptual framework for esker sedimentary systems is established to address these issues. A research strategy is then outlined, one whose objective is to fill knowledge gaps and, in doing so, improve the effectiveness of mineral exploration in glaciated terrain.

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