Bibliographische Detailangaben
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Personen und Körperschaften:
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Campbell, J E (VerfasserIn) |
| Format: |
Artikel
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| Sprache: |
English
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| veröffentlicht: |
Northwest Territories Geological Survey, 2015 |
| Gesamtaufnahme: |
GEM2: Geo-mapping for Energy and Minerals
Surficial till composition; Surficial geology applied to drift exploration: new insights with existing datasets; by McKillop, R; Sacco, D; Cummings, D; Campbell, J; Winterburn, P; Northwest Territories Geological Survey, NWT Open Report 2016-009, 2017 p. 1-64, Earth Sciences Sector, Contribution Series
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| Schlagwörter: |
Drift Prospecting;
Drift Deposits;
Tills;
Sediment Dispersal;
Depositional Environment;
Glacial History;
Provenance;
Glacial Deposits;
Northwest Territories;
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| Quelle: |
GEOSCAN
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| Zusammenfassung: |
The most common method of drift prospecting in mineral exploration is the s...
The most common method of drift prospecting in mineral exploration is the surface till sampling survey, either for geochemistry or indicator minerals. For successful implementation of such surveys, one must have a good understanding of the glacial geological framework. A key component of this framework and of drift prospecting fundamentals is the composition of surface till deposits. Compositional data provides information of its provenance, transport distances and direction ¿ key factors for locating dispersal source(s). Till composition is inherently linked to glacial landforms and terrains, which in turn, record the paleoglaciological conditions under which they developed. Surface till is the cumulative product of the region¿s glacial and postglacial history. This presentation outlines what constitutes till composition (till matrix texture and geochemistry, mineralogy, and lithology) and how these components are related to provenance, facies, landforms and glacial processes. It demonstrates how till composition reflects glacial dynamics, basal ice conditions over time, including re-sedimentation/ re-distribution /overprinting by subsequent ice flows (degree of inheritance). Three study areas 1) Athabasca Basin, Saskatchewan, 2) Wager Bay north, Nunavut and 3) South Rae Province are presented to illustrate the significance of understanding the till composition to the application of drift prospecting principals. Relevance of surface till composition to unravelling the glacial geological framework and the influence of till composition on geochemistry and indicator minerals is presented. With respect to drift prospecting, defining till composition(s) in an area of interest informs surficial sampling strategies and assists with validation of surficial geochemical/indicator anomalies and interpretation of dispersal patterns, especially in terrains with complex glacial histories.
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