Review of till geochemistry and indicator mineral methods for mineral exploration in glaciated terrain

• Main Authors: M. B. McClenaghan, R. C. Paulen, I. R. Smith, J. M. Rice, A. Plouffe, I. McMartin, J. E. Campbell, M. Lehtonen, M. Parsasadr, C. E. Beckett-Brown
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2023
• Subjects: Geology; southwestern northwest territories; organge iron staining; grain size distribution; crudely stratified diamict; cretaceous sedimentary bedrock; 75 cm long; 65 cm long; permafrost active layer; discontinuous permafrost landscape; convoluted sandy interbeds; indicator mineral methods; gravity flow deposit; gently dip downslope; deep exploration trench; central british columbia; various till facies; fissile sandy quartz; subglacial traction tills; matrix supported sediment; grained matrix material; glacigenic properties due; clast content appears; bedrock fragments exposed; structureless sandy till; strongly fissle silt; weakly compacted sandy; weakly fissile till; strongly fissile till; photo 15 shows; silt meltout till; fissile sandy; mineral exploration; glacigenic properties; sandy till; weakly jointed; strongly jointed; permafrost terrain; meltout till; silt till; photo 15; moderately compacted; displaced downslope; colluvial deposit; central canada; meltout tills; till upslope; till shown; till geochemistry; rich till; Northwest Territories; Canada; British Columbia; Paulen; permafrost
• Online Access: https://doi.org/10.6084/m9.figshare.23932386.v1; https://figshare.com/articles/journal_contribution/Review_of_till_geochemistry_and_indicator_mineral_methods_for_mineral_exploration_in_glaciated_terrain/23932386

Appendix 3. Photographs of till: A selection of colour photographs of various till facies, from different glaciological, geological, and geographical settings. Photos 1 to 6 illustrate various types of subglacial traction tills that have been sampled for regional surveys by experienced Quaternary researchers across Canada. Photos 7 to 12 show those same tills, and how they would appear when sampling them. Photos 13 and 14 are of meltout tills, that may be sampled in proper context but care must be taken when interpreting the results from those samples. Photo 15 shows a colluvial deposit, comprising till that has been reworked into a gravity flow deposit. Appendix 3-Photo 1. Dense overconsolidated silty sand subglacial traction till with oxidation (organge iron staining) on the joint planes, from a till exposure overlying carbonate bedrock, southwestern Northwest Territories, northern Canada. Note that most of the clasts are subrounded. Knife for scale. Photo by Roger Paulen. Appendix 3-Photo 2. Moderately indurated, weakly jointed, strongly fissle silt-sand subglacial traction till from a till exposure overlying carbonate bedrock, southwestern Northwest Territories, northern Canada. The clasts range from subrounded to subangular. Photo by Roger Paulen. Appendix 3-Photo 3. Dense, overconsolidated clayey-silt subglacial traction till with weak jointing and minimal fissility, from a till exposure overlying Cretaceous sedimentary bedrock of the Western Canada Sedimentary Basin, northern Alberta, western Canada. Note that the clast content appears to be low because only the indurated (exotic) clasts that are easily seen in the till exposure. Geotool is 75 cm long. Photo by Roger Paulen. Appendix 3-Photo 4. Moderately compact clayey silt subglacial traction till with well-developed jointing and strong fissility, from a till exposure overlying Cretaceous sedimentary bedrock of the Western Canada Sedimentary Basin, northern Alberta, western Canada. The upper part of the exposure has dried out, resulting in desiccation ...